Access blocked by CORS policy: Response to preflight request doesn't pass access control check

Since the originating port 4200 is different than 8080,So before angular sends a create (PUT) request,it will send an OPTIONS request to the server to check what all methods and what all access-controls are in place. Server has to respond to that OPTIONS request with list of allowed methods and allowed origins.

Since you are using spring boot, the simple solution is to add ".allowedOrigins("http://localhost:4200");"

In your spring config,class

@Configuration
@EnableWebMvc
public class SpringConfig implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**").allowedOrigins("http://localhost:4200");
    }
}

However a better approach will be to write a Filter(interceptor) which adds the necessary headers to each response.

origin 'http://localhost:4200' has been blocked by CORS policy in Angular7

I Tried adding the below statement on my API on the express server and it worked with Angular8.

app.use((req, res, next) => {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Methods", "GET , PUT , POST , DELETE");
    res.header("Access-Control-Allow-Headers", "Content-Type, x-requested-with");
    next(); // Important
})

Has been blocked by CORS policy: Response to preflight request doesn’t pass access control check

Enable cross-origin requests in ASP.NET Web API click for more info

Enable CORS in the WebService app. First, add the CORS NuGet package. In Visual Studio, from the Tools menu, select NuGet Package Manager, then select Package Manager Console. In the Package Manager Console window, type the following command:

Install-Package Microsoft.AspNet.WebApi.Cors

This command installs the latest package and updates all dependencies, including the core Web API libraries. Use the -Version flag to target a specific version. The CORS package requires Web API 2.0 or later.

Open the file App_Start/WebApiConfig.cs. Add the following code to the WebApiConfig.Register method:

using System.Web.Http;
namespace WebService
{
    public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
            // New code
            config.EnableCors();

            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );
        }
    }
}

Next, add the [EnableCors] attribute to your controller/ controller methods

using System.Net.Http;
using System.Web.Http;
using System.Web.Http.Cors;

namespace WebService.Controllers
{
    [EnableCors(origins: "http://mywebclient.azurewebsites.net", headers: "*", methods: "*")]
    public class TestController : ApiController
    {
        // Controller methods not shown...
    }
}

Enable Cross-Origin Requests (CORS) in ASP.NET Core

installation app blocked by play protect

I found the solution: Go to the link below and submit your application.

Play Protect Appeals Submission Form

After a few days, the problem will be fixed

Cross-Origin Read Blocking (CORB)

In most cases, the blocked response should not affect the web page's behavior and the CORB error message can be safely ignored. For example, the warning may occur in cases when the body of the blocked response was empty already, or when the response was going to be delivered to a context that can't handle it (e.g., a HTML document such as a 404 error page being delivered to an tag).

https://www.chromium.org/Home/chromium-security/corb-for-developers

I had to clean my browser's cache, I was reading in this link, that, if the request get a empty response, we get this warning error. I was getting some CORS on my request, and so the response of this request got empty, All I had to do was clear the browser's cache, and the CORS got away. I was receiving CORS because the chrome had saved the PORT number on the cache, The server would just accept localhost:3010 and I was doing localhost:3002, because of the cache.

How to make audio autoplay on chrome

If you're OK with enclosing the whole HTML <body> with a <div> tag, here is my solution, which works on Chrome 88.0.4324.104 (the latest version as of Jan., 23, 2021).

First, add the audio section along with a piece of script shown below at the start of <body> section:

<audio id="divAudio">
   <source src="music.mp3" type="audio/mp3">
</audio>

<script>
   var vAudio = document.getElementById("divAudio");
   function playMusic()
   {
      vAudio.play();
   }
</script>

Second, enclose your whole HTML <body> contents (excluding the inserted piece of code shown above) with a dummy section <div onmouseover="playMusic()">. If your HTML <body> contents are already enclosed by a global <div> section, then just add the onmouseover="playMusic()" tag in that <div>.

The solution works by triggering the playMusic() function by hovering over the webpage and tricks Chrome of "thinking" that the user has done something to play it. This solution also comes with the benefit that the piece of audio would only be played when the user is browsing that page.

"Could not get any response" response when using postman with subdomain

In my case it was a misconfigured subnet. Only one of the 2 subnets in the ELB worked.

I figured this out by doing a nslookup and trying to curl the returned IPs directly. Only one worked. Postman just kept using the misconfigured one.

How to solve 'Redirect has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header'?

To add the CORS authorization to the header using Apache, simply add the following line inside either the <Directory>, <Location>, <Files> or <VirtualHost> sections of your server config (usually located in a *.conf file, such as httpd.conf or apache.conf), or within a .htaccess file:

Header set Access-Control-Allow-Origin "*"

And then restart apache.

Altering headers requires the use of mod_headers. Mod_headers is enabled by default in Apache, however, you may want to ensure it's enabled.

XMLHttpRequest blocked by CORS Policy

I believe sideshowbarker 's answer here has all the info you need to fix this. If your problem is just No 'Access-Control-Allow-Origin' header is present on the response you're getting, you can set up a CORS proxy to get around this. Way more info on it in the linked answer

Access to Image from origin 'null' has been blocked by CORS policy

Under the covers there will be some form of URL loading request. You can't load images or any other content via this method from a local file system.

Your image needs to be loaded via a web server, so accessed via a proper http URL.

Resource blocked due to MIME type mismatch (X-Content-Type-Options: nosniff)

i also facing this same problem in django server.So i changed DEBUG = True in settings.py file its working

A Parser-blocking, cross-origin script is invoked via document.write - how to circumvent it?

Don't use document.write, here is workaround:

var script = document.createElement('script');  
script.src = "....";  
document.head.appendChild(script);

WARNING: sanitizing unsafe style value url

For anyone who is already doing what the warning suggests you do, before the upgrade to Angular 5, I had to map my SafeStyle types to string before using them in the templates. After Angular 5, this is no longer the case. I had to change my models to have an image: SafeStyle instead of image: string. I was already using the [style.background-image] property binding and bypassing security on the whole url.

Hope this helps someone.

Page loaded over HTTPS but requested an insecure XMLHttpRequest endpoint

Try to add a s after http

Like this:

http://integration.jsite.com/data/vis => https://integration.jsite.com/data/vis

It works for me

Content Security Policy: The page's settings blocked the loading of a resource

You can disable them in your browser.

Firefox

Type about:config in the Firefox address bar and find security.csp.enable and set it to false.

Chrome

You can install the extension called Disable Content-Security-Policy to disable CSP.

Facebook login message: "URL Blocked: This redirect failed because the redirect URI is not whitelisted in the app’s Client OAuth Settings."

In my case URI, as it was defined on FB, was fine, but I was using Spring Security and it was adding ;jsessionid=0B9A5E71DAA32A01A3CD351E6CA1FCDD to my URI so, it caused the mismatching.

https://m.facebook.com/v2.5/dialog/oauth?client_id=your-fb-id-code&response_type=code&redirect_uri=https://localizator.org/auth/facebook;jsessionid=0B9A5E71DAA32A01A3CD351E6CA1FCDD&scope=email&state=b180578a-007b-48bc-bd81-4b08c6989e18

In order to avoid the URL rewriting I added disable-url-rewriting="true" to Spring Security config, in this way:

<http auto-config="true" access-denied-page="/security/accessDenied" use-expressions="true"
      disable-url-rewriting="true" entry-point-ref="authenticationEntryPoint"/>

And it fixed my problem.

"Mixed content blocked" when running an HTTP AJAX operation in an HTTPS page

I resolved this by adding following code to the HTML page, since we are using the third party API which is not controlled by us.

<meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests">

Hope this would help, and for a record as well.

Can a website detect when you are using Selenium with chromedriver?

A lot have been analyzed and discussed about a website being detected being driven by Selenium controlled ChromeDriver. Here are my two cents:

According to the article Browser detection using the user agent serving different webpages or services to different browsers is usually not among the best of ideas. The web is meant to be accessible to everyone, regardless of which browser or device an user is using. There are best practices outlined to develop a website to progressively enhance itself based on the feature availability rather than by targeting specific browsers.

However, browsers and standards are not perfect, and there are still some edge cases where some websites still detects the browser and if the browser is driven by Selenium controled WebDriver. Browsers can be detected through different ways and some commonly used mechanisms are as follows:

Implementing captcha / recaptcha to detect the automatic bots.

You can find a relevant detailed discussion in How does recaptcha 3 know I'm using selenium/chromedriver?

Detecting the term HeadlessChrome within headless Chrome UserAgent

You can find a relevant detailed discussion in Access Denied page with headless Chrome on Linux while headed Chrome works on windows using Selenium through Python

Using Bot Management service from Distil Networks

You can find a relevant detailed discussion in Unable to use Selenium to automate Chase site login

Using Bot Manager service from Akamai

You can find a relevant detailed discussion in Dynamic dropdown doesn't populate with auto suggestions on https://www.nseindia.com/ when values are passed using Selenium and Python

Using Bot Protection service from Datadome

You can find a relevant detailed discussion in Website using DataDome gets captcha blocked while scraping using Selenium and Python

However, using the user-agent to detect the browser looks simple but doing it well is in fact a bit tougher.

Note: At this point it's worth to mention that: it's very rarely a good idea to use user agent sniffing. There are always better and more broadly compatible way to address a certain issue.

Considerations for browser detection

The idea behind detecting the browser can be either of the following:

Trying to work around a specific bug in some specific variant or specific version of a webbrowser.
Trying to check for the existence of a specific feature that some browsers don't yet support.
Trying to provide different HTML depending on which browser is being used.

Alternative of browser detection through UserAgents

Some of the alternatives of browser detection are as follows:

Implementing a test to detect how the browser implements the API of a feature and determine how to use it from that. An example was Chrome unflagged experimental lookbehind support in regular expressions.
Adapting the design technique of Progressive enhancement which would involve developing a website in layers, using a bottom-up approach, starting with a simpler layer and improving the capabilities of the site in successive layers, each using more features.
Adapting the top-down approach of Graceful degradation in which we build the best possible site using all the features we want and then tweak it to make it work on older browsers.

Solution

To prevent the Selenium driven WebDriver from getting detected, a niche approach would include either/all of the below mentioned approaches:

Rotating the UserAgent in every execution of your Test Suite using fake_useragent module as follows:

from selenium import webdriver
from selenium.webdriver.chrome.options import Options
from fake_useragent import UserAgent

options = Options()
ua = UserAgent()
userAgent = ua.random
print(userAgent)
options.add_argument(f'user-agent={userAgent}')
driver = webdriver.Chrome(chrome_options=options, executable_path=r'C:\WebDrivers\ChromeDriver\chromedriver_win32\chromedriver.exe')
driver.get("https://www.google.co.in")
driver.quit()

You can find a relevant detailed discussion in Way to change Google Chrome user agent in Selenium?

Rotating the UserAgent in each of your Tests using Network.setUserAgentOverride through execute_cdp_cmd() as follows:

from selenium import webdriver

driver = webdriver.Chrome(executable_path=r'C:\WebDrivers\chromedriver.exe')
print(driver.execute_script("return navigator.userAgent;"))
# Setting user agent as Chrome/83.0.4103.97
driver.execute_cdp_cmd('Network.setUserAgentOverride', {"userAgent": 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.97 Safari/537.36'})
print(driver.execute_script("return navigator.userAgent;"))

You can find a relevant detailed discussion in How to change the User Agent using Selenium and Python

Changing the property value of navigator for webdriver to undefined as follows:

driver.execute_cdp_cmd("Page.addScriptToEvaluateOnNewDocument", {
  "source": """
    Object.defineProperty(navigator, 'webdriver', {
      get: () => undefined
    })
  """
})

You can find a relevant detailed discussion in Selenium webdriver: Modifying navigator.webdriver flag to prevent selenium detection

Changing the values of navigator.plugins, navigator.languages, WebGL, hairline feature, missing image, etc.

You can find a relevant detailed discussion in Is there a version of selenium webdriver that is not detectable?

Changing the conventional Viewport

You can find a relevant detailed discussion in How to bypass Google captcha with Selenium and python?

Dealing with reCAPTCHA

While dealing with 2captcha and recaptcha-v3 rather clicking on checkbox associated to the text I'm not a robot, it may be easier to get authenticated extracting and using the data-sitekey.

You can find a relevant detailed discussion in How to identify the 32 bit data-sitekey of ReCaptcha V2 to obtain a valid response programmatically using Selenium and Python Requests?

jQuery ajax request being block because Cross-Origin

I solved this by changing the file path in the browser:

Instead of: c/XAMPP/htdocs/myfile.html
I wrote: localhost/myfile.html

CORS header 'Access-Control-Allow-Origin' missing

You must have got the idea why you are getting this problem after going through above answers.

self.send_header('Access-Control-Allow-Origin', '*')

You just have to add the above line in your server side.

Transport security has blocked a cleartext HTTP

For Cordova, if you want to add it into your ios.json, do the following:

"NSAppTransportSecurity": [
   {
      "xml": "<dict><key>NSAllowsArbitraryLoads</key><true /></dict>"
   }
]

And it should be inside of:

"*-Info.plist": {
   "parents": {
   }
}

How can I add NSAppTransportSecurity to my info.plist file?

Update Answer (after wwdc 2016):

IOS apps will require secure HTTPS connections by the end of 2016

App Transport Security, or ATS, is a feature that Apple introduced in iOS 9. When ATS is enabled, it forces an app to connect to web services over an HTTPS connection rather than non secure HTTP.

However, developers can still switch ATS off and allow their apps to send data over an HTTP connection as mentioned in above answers. At the end of 2016, Apple will make ATS mandatory for all developers who hope to submit their apps to the App Store. link

Apache Server (xampp) doesn't run on Windows 10 (Port 80)

Type in command line

netstat -aon | findstr :80

You'll see PID of process which uses port 80. Then try to configure this app to use another port, or just kill it

UPDATE: I'll write my comment here to be more clear: according to this link, in Windows 10, it is the MsDepSvc service which occupies port 80. It's for IIS or Web Matrix 2. If you will not use IIS or Web Matrix 2 for any web development, you can try shutting down the service

And for the second part of your question, you can tell Apache to use another port by editing [Apache folder]/conf/httpd.conf. It has "Listen 80" string. Change 80 to whatever free port you want and reload Apache

Plotting in a non-blocking way with Matplotlib

I figured out that the plt.pause(0.001) command is the only thing needed and nothing else.

plt.show() and plt.draw() are unnecessary and / or blocking in one way or the other. So here is a code that draws and updates a figure and keeps going. Essentially plt.pause(0.001) seems to be the closest equivalent to matlab's drawnow.

Unfortunately those plots will not be interactive (they freeze), except you insert an input() command, but then the code will stop.

The documentation of the plt.pause(interval) command states:

If there is an active figure, it will be updated and displayed before the pause...... This can be used for crude animation.

and this is pretty much exactly what we want. Try this code:

import numpy as np
from matplotlib import pyplot as plt

x = np.arange(0, 51)               # x coordinates  
         
for z in range(10, 50):

    y = np.power(x, z/10)          # y coordinates of plot for animation

    plt.cla()                      # delete previous plot
    plt.axis([-50, 50, 0, 10000])  # set axis limits, to avoid rescaling
    plt.plot(x, y)                 # generate new plot
    plt.pause(0.1)                 # pause 0.1 sec, to force a plot redraw

How to find Google's IP address?

I'm keeping the following list updated for a couple of years now:

1.0.0.0/24
1.1.1.0/24
1.2.3.0/24
8.6.48.0/21
8.8.8.0/24
8.35.192.0/21
8.35.200.0/21
8.34.216.0/21
8.34.208.0/21
23.236.48.0/20
23.251.128.0/19
63.161.156.0/24
63.166.17.128/25
64.9.224.0/19
64.18.0.0/20
64.233.160.0/19
64.233.171.0/24
65.167.144.64/28
65.170.13.0/28
65.171.1.144/28
66.102.0.0/20
66.102.14.0/24
66.249.64.0/19
66.249.92.0/24
66.249.86.0/23
70.32.128.0/19
72.14.192.0/18
74.125.0.0/16
89.207.224.0/21
104.154.0.0/15
104.132.0.0/14
107.167.160.0/19
107.178.192.0/18
108.59.80.0/20
108.170.192.0/18
108.177.0.0/17
130.211.0.0/16
142.250.0.0/15
144.188.128.0/24
146.148.0.0/17
162.216.148.0/22
162.222.176.0/21
172.253.0.0/16
173.194.0.0/16
173.255.112.0/20
192.158.28.0/22
193.142.125.0/28
199.192.112.0/22
199.223.232.0/21
206.160.135.240/24
207.126.144.0/20
208.21.209.0/24
209.85.128.0/17
216.239.32.0/19

XAMPP: Couldn't start Apache (Windows 10)

I found that running apache_start in gave me the exact error and on which line it was.

My error was that I left a space in between localhost: and the port.

how to create virtual host on XAMPP

I have added below configuration to the httpd.conf and restarted the lampp service and it started working. Thanks to all the above posts, which helped me to resolve issues one by one.

Listen 8080
<VirtualHost *:8080>
    ServerAdmin [email protected]
    DocumentRoot "/opt/lampp/docs/dummy-host2.example.com"
    ServerName localhost:8080
    ErrorLog "logs/dummy-host2.example.com-error_log"
    CustomLog "logs/dummy-host2.example.com-access_log" common
    <Directory "/opt/lampp/docs/dummy-host2.example.com">
        Require all granted 
    </Directory>
</VirtualHost>

How can I fix the 'Missing Cross-Origin Resource Sharing (CORS) Response Header' webfont issue?

we had similar header issue with Amazon (AWS) S3 presigned Post failing on some browsers.

point was to tell bucket CORS to expose header <ExposeHeader>Access-Control-Allow-Origin</ExposeHeader>

more details in this answer: https://stackoverflow.com/a/37465080/473040

How to detect query which holds the lock in Postgres?

Since 9.6 this is a lot easier as it introduced the function pg_blocking_pids() to find the sessions that are blocking another session.

So you can use something like this:

select pid, 
       usename, 
       pg_blocking_pids(pid) as blocked_by, 
       query as blocked_query
from pg_stat_activity
where cardinality(pg_blocking_pids(pid)) > 0;

Font from origin has been blocked from loading by Cross-Origin Resource Sharing policy

If you want to allow all the fonts from a folder for a specific domain then you can use this:

  <location path="assets/font">
    <system.webServer>
      <httpProtocol>
        <customHeaders>
          <add name="Access-Control-Allow-Origin" value="http://localhost:3000" />
        </customHeaders>
      </httpProtocol>
    </system.webServer>
  </location>

where assets/font is the location where all fonts are and http://localhost:3000 is the location which you want to allow.

SecurityError: Blocked a frame with origin from accessing a cross-origin frame

Complementing Marco Bonelli's answer: the best current way of interacting between frames/iframes is using window.postMessage, supported by all browsers

Install Chrome extension form outside the Chrome Web Store

For Windows, you can also whitelist your extension through Windows policies. The full steps are details in this answer, but there are quicker steps:

Create the registry key HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\ExtensionInstallWhitelist.
For each extension you want to whitelist, add a string value whose name should be a sequence number (starting at 1) and value is the extension ID.

For instance, in order to whitelist 2 extensions with ID aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa and bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb, create a string value with name 1 and value aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa, and a second value with name 2 and value bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb. This can be sum up by this registry file:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome]

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\ExtensionInstallWhitelist]
"1"="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
"2"="bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"

EDIT: actually, Chromium docs also indicate how to do it for other OS.

Firefox 'Cross-Origin Request Blocked' despite headers

Ubuntu Firefox giving CORS failed error when my request took more than 10 seconds to process.

Nothing to do with CORS. Problem is with ubuntu firefox configuration.

I have updated network.notify.changed to false which made this fix.

Mozilla Bugs Reference:

https://bugzilla.mozilla.org/show_bug.cgi?id=1238377

https://bugzilla.mozilla.org/show_bug.cgi?id=1235509

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at

The server at x3.chatforyoursite.com needs to output the following header:

Access-Control-Allow-Origin: http://www.example.com

Where http://www.example.com is your website address. You should check your settings on chatforyoursite.com to see if you can enable this - if not their technical support would probably be the best way to resolve this. However to answer your question, you need the remote site to allow your site to access AJAX responses client side.

error running apache after xampp install

I think killing the process which is uses that port is more easy to handle than changing the ports in config files. Here is how to do it in Windows. You can follow same procedure to Linux but different commands. Run command prompt as Administrator. Then type below command to find out all of processes using the port.

netstat -ano

There will be plenty of processes using various ports. So to get only port we need use findstr like below (here I use port 80)

netstat -ano | findstr 80

this will gave you result like this

TCP    0.0.0.0:80             0.0.0.0:0              LISTENING       7964

Last number is the process ID of the process. so what we have to do is kill the process using PID we can use taskkill command for that.

taskkill /PID 7964 /F

Run your server again. This time it will be able to run. This can uses for Mysql server too.

Socket.io + Node.js Cross-Origin Request Blocked

For anyone looking here for new Socket.io (3.x) the migration documents are fairly helpful.

In particular this snippet:

const io = require("socket.io")(httpServer, {
  cors: {
    origin: "https://example.com",
    methods: ["GET", "POST"],
    allowedHeaders: ["my-custom-header"],
    credentials: true
  }
});

Ajax Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource

Add the below code to your .htaccess

Header set Access-Control-Allow-Origin *

It works for me.

Thanks

ORA-12528: TNS Listener: all appropriate instances are blocking new connections. Instance "CLRExtProc", status UNKNOWN

I had this problem on my developent environment with Visual Studio.

What helped me was to Clean Solution in Visual Studio and then do a rebuild.

Failed to load resource: net::ERR_INSECURE_RESPONSE

If you're developing, and you're developing with a Windows machine, simply add localhost as a Trusted Site.

And yes, per DarrylGriffiths' comment, although it may look like you're adding an Internet Explorer setting...

I believe those are Windows rather than IE settings. Although MS tend to assume that they're only IE (hence the alert next to "Enable Protected Mode" that it requries restarted IE)...

Unable to launch the IIS Express Web server, Failed to register URL, Access is denied

try (as elevated administrator)

netsh http delete urlacl url=http://*:62940/

Getting "net::ERR_BLOCKED_BY_CLIENT" error on some AJAX calls

Add PrivacyBadger to the list of potential causes

Javascript window.print() in chrome, closing new window or tab instead of cancelling print leaves javascript blocked in parent window

Run this code It will open google print service popup.

function openPrint(x) {

   if (x > 0) { 
       openPrint(--x); print(x); openPrint(--x);
   }

}

Try it on console where x is integer .

openPrint(1);   // Will open Chrome Print Popup Once
openPrint(2);   // Will open Chrome Print Popup Twice after 1st close and so on

Thanks

How are people unit testing with Entity Framework 6, should you bother?

In order to unit test code that relies on your database you need to setup a database or mock for each and every test.

Having a database (real or mocked) with a single state for all your tests will bite you quickly; you cannot test all records are valid and some aren't from the same data.
Setting up an in-memory database in a OneTimeSetup will have issues where the old database is not cleared down before the next test starts up. This will show as tests working when you run them individually, but failing when you run them all.
A Unit test should ideally only set what affects the test

I am working in an application that has a lot of tables with a lot of connections and some massive Linq blocks. These need testing. A simple grouping missed, or a join that results in more than 1 row will affect results.

To deal with this I have setup a heavy Unit Test Helper that is a lot of work to setup, but enables us to reliably mock the database in any state, and running 48 tests against 55 interconnected tables, with the entire database setup 48 times takes 4.7 seconds.

Here's how:

In the Db context class ensure each table class is set to virtual

public virtual DbSet<Branch> Branches { get; set; }
public virtual DbSet<Warehouse> Warehouses { get; set; }

In a UnitTestHelper class create a method to setup your database. Each table class is an optional parameter. If not supplied, it will be created through a Make method

internal static Db Bootstrap(bool onlyMockPassedTables = false, List<Branch> branches = null, List<Products> products = null, List<Warehouses> warehouses = null)
{
    if (onlyMockPassedTables == false) {
        branches ??= new List<Branch> { MakeBranch() };
        warehouses ??= new List<Warehouse>{ MakeWarehouse() };
    }

For each table class, each object in it is mapped to the other lists

    branches?.ForEach(b => {
        b.Warehouse = warehouses.FirstOrDefault(w => w.ID == b.WarehouseID);
    });

    warehouses?.ForEach(w => {
        w.Branches = branches.Where(b => b.WarehouseID == w.ID);
    });

And add it to the DbContext

     var context = new Db(new DbContextOptionsBuilder<Db>().UseInMemoryDatabase(Guid.NewGuid().ToString()).Options);
     context.Branches.AddRange(branches);
     context.Warehouses.AddRange(warehouses);
     context.SaveChanges();
     return context;
 }

Define a list of IDs to make is easier to reuse them and make sure joins are valid
```
 internal const int BranchID = 1;
 internal const int WarehouseID = 2;
```

Create a Make for each table to setup the most basic, but connected version it can be

 internal static Branch MakeBranch(int id = BranchID, string code = "The branch", int warehouseId = WarehouseID) => new Branch { ID = id, Code = code, WarehouseID = warehouseId };
 internal static Warehouse MakeWarehouse(int id = WarehouseID, string code = "B", string name = "My Big Warehouse") => new Warehouse { ID = id, Code = code, Name = name };

It's a lot of work, but it only needs doing once, and then your tests can be very focused because the rest of the database will be setup for it.

[Test]
[TestCase(new string [] {"ABC", "DEF"}, "ABC", ExpectedResult = 1)]
[TestCase(new string [] {"ABC", "BCD"}, "BC", ExpectedResult = 2)]
[TestCase(new string [] {"ABC"}, "EF", ExpectedResult = 0)]
[TestCase(new string[] { "ABC", "DEF" }, "abc", ExpectedResult = 1)]
public int Given_SearchingForBranchByName_Then_ReturnCount(string[] codesInDatabase, string searchString)
{
    // Arrange
    var branches = codesInDatabase.Select(x => UnitTestHelpers.MakeBranch(code: $"qqqq{x}qqq")).ToList();
    var db = UnitTestHelpers.Bootstrap(branches: branches);
    var service = new BranchService(db);

    // Act
    var result = service.SearchByName(searchString);

    // Assert
    return result.Count();
}

Cross-Origin Request Blocked

You need other headers, not only access-control-allow-origin. If your request have the "Access-Control-Allow-Origin" header, you must copy it into the response headers, If doesn't, you must check the "Origin" header and copy it into the response. If your request doesn't have Access-Control-Allow-Origin not Origin headers, you must return "*".

You can read the complete explanation here: http://www.html5rocks.com/en/tutorials/cors/#toc-adding-cors-support-to-the-server

and this is the function I'm using to write cross domain headers:

func writeCrossDomainHeaders(w http.ResponseWriter, req *http.Request) {
    // Cross domain headers
    if acrh, ok := req.Header["Access-Control-Request-Headers"]; ok {
        w.Header().Set("Access-Control-Allow-Headers", acrh[0])
    }
    w.Header().Set("Access-Control-Allow-Credentials", "True")
    if acao, ok := req.Header["Access-Control-Allow-Origin"]; ok {
        w.Header().Set("Access-Control-Allow-Origin", acao[0])
    } else {
        if _, oko := req.Header["Origin"]; oko {
            w.Header().Set("Access-Control-Allow-Origin", req.Header["Origin"][0])
        } else {
            w.Header().Set("Access-Control-Allow-Origin", "*")
        }
    }
    w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE")
    w.Header().Set("Connection", "Close")

}

I am getting Failed to load resource: net::ERR_BLOCKED_BY_CLIENT with Google chrome

This issue may be due to the flags of chrome browser. Reset it, it worked for me. chrome://flags Right corner 'Reset all to defaults' button.

How to unblock with mysqladmin flush hosts

mysqladmin is not a SQL statement. It's a little helper utility program you'll find on your MySQL server... and "flush-hosts" is one of the things it can do. ("status" and "shutdown" are a couple of other things that come to mind).

You type that command from a shell prompt.

Alternately, from your query browser (such as phpMyAdmin), the SQL statement you're looking for is simply this:

FLUSH HOSTS;

http://dev.mysql.com/doc/refman/5.6/en/flush.html

http://dev.mysql.com/doc/refman/5.6/en/mysqladmin.html

How does Facebook disable the browser's integrated Developer Tools?

Internally devtools injects an IIFE named getCompletions into the page, called when a key is pressed inside the Devtools console.

Looking at the source of that function, it uses a few global functions which can be overwritten.

By using the Error constructor it's possible to get the call stack, which will include getCompletions when called by Devtools.

Example:

_x000D_

const disableDevtools = callback => {_x000D_
  const original = Object.getPrototypeOf;_x000D_
_x000D_
  Object.getPrototypeOf = (...args) => {_x000D_
    if (Error().stack.includes("getCompletions")) callback();_x000D_
    return original(...args);_x000D_
  };_x000D_
};_x000D_
_x000D_
disableDevtools(() => {_x000D_
  console.error("devtools has been disabled");_x000D_
_x000D_
  while (1);_x000D_
});

_x000D_

External resource not being loaded by AngularJs

I ran into the same problem using Videogular. I was getting the following when using ng-src:

Error: [$interpolate:interr] Can't interpolate: {{url}}
Error: [$sce:insecurl] Blocked loading resource from url not allowed by $sceDelegate policy

I fixed the problem by writing a basic directive:

angular.module('app').directive('dynamicUrl', function () {
return {
  restrict: 'A',
  link: function postLink(scope, element, attrs) {
    element.attr('src', scope.content.fullUrl);
  }
};
});

The html:

 <div videogular vg-width="200" vg-height="300" vg-theme="config.theme">
    <video class='videoPlayer' controls preload='none'>
          <source dynamic-url src='' type='{{ content.mimeType }}'>
    </video>
 </div>

"application blocked by security settings" prevent applets running using oracle SE 7 update 51 on firefox on Linux mint

The application that you are running is blocked because the application does not comply with security guidelines implemented in Java 7 Update 51

"CAUTION: provisional headers are shown" in Chrome debugger

"Caution: provisional headers are shown" message can be shown when website hosted on HTTPS invokes a calls to WebApi hosted on HTTP. You can check all if all your Api's are HTTPS. Browser prevents to do a call to insecure resource. You can see similar message in your code when use FETCH API to domain with HTTP.

Mixed Content: The page at 'https://website.com' was loaded over HTTPS, but requested an insecure resource 'http://webapi.com'. This request has been blocked; the content must be served over HTTPS.

How to make a machine trust a self-signed Java application

SERIOUS DISCLAIMER

This solution has a serious security flaw. Please use at your own risk.
Have a look at the comments on this post, and look at all the answers to this question.

OK, I had to go to the customer premises and found a solution. I:

Exported the keystore that holds the signing keys in PKCS #12 format
Opened control panel Java -> Security tab
Clicked Manage certificates
Imported this new keystore as a secure site CA

Then I opened the JAWS application without any warning. This is a little bit cumbersome, but much cheaper than buying a signed certificate!

How to add class active on specific li on user click with jQuery

//Write a javascript method to bind click event of each "li" item

    function BindClickEvent()
    {
    var selector = '.nav li';
    //Removes click event of each li
    $(selector ).unbind('click');
    //Add click event
    $(selector ).bind('click', function()
    {
        $(selector).removeClass('active');
        $(this).addClass('active');
    });

    }

//first call this method when first time when page load

    $( document ).ready(function() {
         BindClickEvent();
    });

//Call BindClickEvent method from server side

    protected void Page_Load(object sender, EventArgs e)
    {
        ScriptManager.RegisterStartupScript(Page,GetType(), Guid.NewGuid().ToString(),"BindClickEvent();",true);
    }

When to use pthread_exit() and when to use pthread_join() in Linux?

Hmm.

POSIX pthread_exit description from http://pubs.opengroup.org/onlinepubs/009604599/functions/pthread_exit.html:

After a thread has terminated, the result of access to local (auto) variables of the thread is 
undefined. Thus, references to local variables of the exiting thread should not be used for 
the pthread_exit() value_ptr parameter value.

Which seems contrary to the idea that local main() thread variables will remain accessible.

Install Visual Studio 2013 on Windows 7

Visual Studio Express for Windows needs Windows 8.1. Having a look at the requirements page you might want to try the Web or Windows Desktop version which are able to run under Windows 7.

Chrome blocks different origin requests

This is a security update. If an attacker can modify some file in the web server (the JS one, for example), he can make every loaded pages to download another script (for example to keylog your password or steal your SessionID and send it to his own server).

To avoid it, the browser check the Same-origin policy

Your problem is that the browser is trying to load something with your script (with an Ajax request) that is on another domain (or subdomain). To avoid it (if it is on your own website) you can:

Copy the element on your own server (but it will be static).
You can change your HTTP header to accept Cross-Origin content. See the Access-Control-Allow-Origin documentation for more information.

JDBC connection failed, error: TCP/IP connection to host failed

important:
after any changes or new settings you must restart SQLSERVER service. run services.msc on Windows

How to allow http content within an iframe on a https site

Try to use protocol relative links.

Your link is http://example.com/script.js, use:

<script src="//example.com/script.js" type="text/javascript"></script>

In this way, you can leave the scheme free (do not indicate the protocol in the links) and trust that the browser uses the protocol of the embedded Web page. If your users visit the HTTP version of your Web page, the script will be loaded over http:// and if your users visit the HTTPS version of your Web site, the script will be loaded over https://.

Seen in: https://developer.mozilla.org/es/docs/Seguridad/MixedContent/arreglar_web_con_contenido_mixto

XAMPP, Apache - Error: Apache shutdown unexpectedly

This worked for me...

If you are using windows...

Search 'cmd' in the windows search bar.

Enter this:C:\xampp\apache\bin\httpd.exe

Find which file and which line the error occurred.

For example, mine was in the file below on line 37.

httpd-multilang-errordoc.conf

Open the code and fix the error by either removing the line or fixing it.

Done! I should work now.

Why am I suddenly getting a "Blocked loading mixed active content" issue in Firefox?

I just fixed this problem by adding the following code in header:

    <meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests">

Reading and writing to serial port in C on Linux

Some receivers expect EOL sequence, which is typically two characters \r\n, so try in your code replace the line

unsigned char cmd[] = {'I', 'N', 'I', 'T', ' ', '\r', '\0'};

with

unsigned char cmd[] = "INIT\r\n";

BTW, the above way is probably more efficient. There is no need to quote every character.

XAMPP - MySQL shutdown unexpectedly

move xampp/mysql/backup files into xampp/mysql/data
RUN XAMPP as Administrator(make sure mysql is installed you can see a green tick if is installed)

Hope it helps!

Why is Node.js single threaded?

The issue with the "one thread per request" model for a server is that they don't scale well for several scenarios compared to the event loop thread model.

Typically, in I/O intensive scenarios the requests spend most of the time waiting for I/O to complete. During this time, in the "one thread per request" model, the resources linked to the thread (such as memory) are unused and memory is the limiting factor. In the event loop model, the loop thread selects the next event (I/O finished) to handle. So the thread is always busy (if you program it correctly of course).

The event loop model as all new things seems shiny and the solution for all issues but which model to use will depend on the scenario you need to tackle. If you have an intensive I/O scenario (like a proxy), the event base model will rule, whereas a CPU intensive scenario with a low number of concurrent processes will work best with the thread-based model.

In the real world most of the scenarios will be a bit in the middle. You will need to balance the real need for scalability with the development complexity to find the correct architecture (e.g. have an event base front-end that delegates to the backend for the CPU intensive tasks. The front end will use little resources waiting for the task result.) As with any distributed system it requires some effort to make it work.

If you are looking for the silver bullet that will fit with any scenario without any effort, you will end up with a bullet in your foot.

Apache is not running from XAMPP Control Panel ( Error: Apache shutdown unexpectedly. This may be due to a blocked port)

For me it was because of vmware (services-it has about 2 or 3 different services),stop it and every thing works fine

The transaction log for the database is full

I had this error once and it ended up being the server's hard drive that run out of disk space.

What exactly is the function of Application.CutCopyMode property in Excel

Normally, When you copy a cell you will find the below statement written down in the status bar (in the bottom of your sheet)

"Select destination and Press Enter or Choose Paste"

Then you press whether Enter or choose paste to paste the value of the cell.

If you didn't press Esc afterwards you will be able to paste the value of the cell several times

Application.CutCopyMode = False does the same like the Esc button, if you removed it from your code you will find that you are able to paste the cell value several times again.

And if you closed the Excel without pressing Esc you will get the warning 'There is a large amount of information on the Clipboard....'

Apache shutdown unexpectedly

I had a similar issue (that is the reason I come to this thread) that originated from a typo in httpd-vhosts.conf

instead of <VirtualHost domain-name:80> I accidentally wrote (through copy-paste) as <domain-name *:80>

Sites not accepting wget user agent header

It seems Yahoo server does some heuristic based on User-Agent in a case Accept header is set to */*.

Accept: text/html

did the trick for me.

e.g.

wget  --header="Accept: text/html" --user-agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:21.0) Gecko/20100101 Firefox/21.0"  http://yahoo.com

Note: if you don't declare Accept header then wget automatically adds Accept:*/* which means give me anything you have.

How to pass IEnumerable list to controller in MVC including checkbox state?

Use a list instead and replace your foreach loop with a for loop:

@model IList<BlockedIPViewModel>

@using (Html.BeginForm()) 
{ 
    @Html.AntiForgeryToken()

    @for (var i = 0; i < Model.Count; i++) 
    {
        <tr>
            <td>
                @Html.HiddenFor(x => x[i].IP)           
                @Html.CheckBoxFor(x => x[i].Checked)
            </td>
            <td>
                @Html.DisplayFor(x => x[i].IP)
            </td>
        </tr>
    }
    <div>
        <input type="submit" value="Unblock IPs" />
    </div>
}

Alternatively you could use an editor template:

@model IEnumerable<BlockedIPViewModel>

@using (Html.BeginForm()) 
{ 
    @Html.AntiForgeryToken()
    @Html.EditorForModel()   
    <div>
        <input type="submit" value="Unblock IPs" />
    </div>
}

and then define the template ~/Views/Shared/EditorTemplates/BlockedIPViewModel.cshtml which will automatically be rendered for each element of the collection:

@model BlockedIPViewModel
<tr>
    <td>
        @Html.HiddenFor(x => x.IP)
        @Html.CheckBoxFor(x => x.Checked)
    </td>
    <td>
        @Html.DisplayFor(x => x.IP)
    </td>
</tr>

The reason you were getting null in your controller is because you didn't respect the naming convention for your input fields that the default model binder expects to successfully bind to a list. I invite you to read the following article.

Once you have read it, look at the generated HTML (and more specifically the names of the input fields) with my example and yours. Then compare and you will understand why yours doesn't work.

JDBC connection to MSSQL server in windows authentication mode

Using windows authentication:

String url ="jdbc:sqlserver://PC01\inst01;databaseName=DB01;integratedSecurity=true";

Using SQL authentication:

String url ="jdbc:sqlserver://PC01\inst01;databaseName=DB01";

Run local java applet in browser (chrome/firefox) "Your security settings have blocked a local application from running"

just add your .jar file in applet tag as an attribute as shown below:

<applet
    code="file.class"
    archive="file.jar"
    height=550 
    width=1100>         
</applet>

Java Error: "Your security settings have blocked a local application from running"

Starting with Java 8, there is no "medium" risk setting in the Security tab under Java
You will keep getting this error till you revert to older Java (suggested Java 7, it has hit the end of life though).
Install both 32-bit and 64-bit version because browsers are still 32-bit, even on a 64-bit machine, 64-bit OS

How to check a channel is closed or not without reading it?

In a hacky way it can be done for channels which one attempts to write to by recovering the raised panic. But you cannot check if a read channel is closed without reading from it.

Either you will

eventually read the "true" value from it (v <- c)
read the "true" value and 'not closed' indicator (v, ok <- c)
read a zero value and the 'closed' indicator (v, ok <- c)
will block in the channel read forever (v <- c)

Only the last one technically doesn't read from the channel, but that's of little use.

Jquery UI datepicker. Disable array of Dates

$('input').datepicker({
   beforeShowDay: function(date){
       var string = jQuery.datepicker.formatDate('yy-mm-dd', date);
       return [ array.indexOf(string) == -1 ]
   }
});

Eclipse will not start and I haven't changed anything

Maybe worth mentioning that when I had this problem I followed bia.migueis's advice - move everything out of the plugins folder - and the workspace would open again, minus a lot of my configuration. But then after that, I copied/overwrote all the original files back into the plugins folder and opened the workspace again: it still worked and the settings I'd had before seemed to be intact.

XAMPP - Error: MySQL shutdown unexpectedly

To resolve this,

Go to your XAMPP folder,

XAMPP -> mysql -> bin -> "my.ini"

After opening my.ini configuration file, Replace 3306 with 3308 in couple of places, because 3308 is a free port.

XAMPP -> php -> "php.ini"

Do the same as you did in "my.ini" file which is changing port 3306 to 3308.

Then, restart the XAMPP server.

It works fine.

How to enable Ad Hoc Distributed Queries

If ad hoc updates to system catalog is "not supported", or if you get a "Msg 5808" then you will need to configure with override like this:

EXEC sp_configure 'show advanced options', 1
RECONFIGURE with override
GO
EXEC sp_configure 'ad hoc distributed queries', 1
RECONFIGURE with override
GO

Apache won't run in xampp

If you just want to make Apache run an don't mind which port it is running on, do the following:

In the XAMPP Control Panel, click on the Apache - 'Config' button which is located next to the 'Logs' button.

Select 'Apache (httpd.conf)' from the drop down. (notepad should open)

Do Ctrl + F to find '80'. Click 'find next' three times and change line Listen 80 to Listen 8080

Click 'find next' again a couple times until you see line ServerName localhost:80 change this to ServerName localhost:8080

Do Ctrl + S to save and then exit notepad.

Start up Apache again in the XAMPP Control Panel, Apache should successfully run.

Use http://localhost:8080/ in your browser address bar to check everything is working.

EDIT

Also you may have problems running XAMPP while running IIS. If you are running IIS it might be worth stopping the service then starting XAMPP.

Getting all names in an enum as a String[]

org.apache.commons.lang3.EnumUtils.getEnumMap(State.class).keySet()

Open application after clicking on Notification

Here's example using NotificationCompact.Builder class which is the recent version to build notification.

private void startNotification() {
    Log.i("NextActivity", "startNotification");

 // Sets an ID for the notification
      int mNotificationId = 001;

    // Build Notification , setOngoing keeps the notification always in status bar
    NotificationCompat.Builder mBuilder =
            new NotificationCompat.Builder(this)
                    .setSmallIcon(R.drawable.ldb)
                    .setContentTitle("Stop LDB")
                    .setContentText("Click to stop LDB")
                    .setOngoing(true);

    // Create pending intent, mention the Activity which needs to be 
    //triggered when user clicks on notification(StopScript.class in this case)

    PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
            new Intent(this, StopScript.class), PendingIntent.FLAG_UPDATE_CURRENT);


    mBuilder.setContentIntent(contentIntent);


    // Gets an instance of the NotificationManager service
   NotificationManager mNotificationManager =
            (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);


    // Builds the notification and issues it.
    mNotificationManager.notify(mNotificationId, mBuilder.build());


}

Enabling/Disabling Microsoft Virtual WiFi Miniport

In the device manager you can select View > Show hidden devices

Apache 2.4.3 (with XAMPP 1.8.1) not starting in windows 8

I had this problem and then I ran "apache_start.bat" the error in german told me there was a problem with line 51 in httpd-ssl.conf which is

SSLCipherSuite HIGH:MEDIUM:!aNULL:!MD5

What I did was comment lines 163 (ssl module) and 522 (httpd-ssl.conf include) in httpd.conf; I don't need ssl for development, so that solved it for me.

Only allow specific characters in textbox

You can probably use the KeyDown event, KeyPress event or KeyUp event. I would first try the KeyDown event I think.

You can set the Handled property of the event args to stop handling the event.

what is the multicast doing on 224.0.0.251?

If you don't have avahi installed then it's probably cups.

How to create Temp table with SELECT * INTO tempTable FROM CTE Query

Really the format can be quite simple - sometimes there's no need to predefine a temp table - it will be created from results of the select.

Select FieldA...FieldN 
into #MyTempTable 
from MyTable

So unless you want different types or are very strict on definition, keep things simple. Note also that any temporary table created inside a stored procedure is automatically dropped when the stored procedure finishes executing. If stored procedure A creates a temp table and calls stored procedure B, then B will be able to use the temporary table that A created.

However, it's generally considered good coding practice to explicitly drop every temporary table you create anyway.

trace a particular IP and port

Firstly, check the IP address that your application has bound to. It could only be binding to a local address, for example, which would mean that you'd never see it from a different machine regardless of firewall states.

You could try using a portscanner like nmap to see if the port is open and visible externally... it can tell you if the port is closed (there's nothing listening there), open (you should be able to see it fine) or filtered (by a firewall, for example).

How to scroll the page when a modal dialog is longer than the screen?

fixed positioning alone should have fixed that problem but another good workaround to avoid this issue is to place your modal divs or elements at the bottom of the page not within your sites layout. Most modal plugins give their modal positioning absolute to allow the user keep main page scrolling.

<html>
        <body>
        <!-- Put all your page layouts and elements


        <!-- Let the last element be the modal elemment  -->
        <div id="myModals">
        ...
        </div>

        </body>
</html>

Confirmation before closing of tab/browser

Try this:

<script>
window.onbeforeunload = function (e) {
    e = e || window.event;

    // For IE and Firefox prior to version 4
    if (e) {
        e.returnValue = 'Sure?';
    }

    // For Safari
    return 'Sure?';
};
</script>

Here is a working jsFiddle

Why is my locally-created script not allowed to run under the RemoteSigned execution policy?

When you run a .ps1 PowerShell script you might get the message saying “.ps1 is not digitally signed. The script will not execute on the system.” To fix it you have to run the command below to run Set-ExecutionPolicy and change the Execution Policy setting.

Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass

Bypass popup blocker on window.open when JQuery event.preventDefault() is set

Windows must be created on the same stack (aka microtask) as the user-initiated event, e.g. a click callback--so they can't be created later, asynchronously.

However, you can create a window without a URL and you can then change that window's URL once you do know it, even asynchronously!

window.onclick = () => {
  // You MUST create the window on the same event
  // tick/stack as the user-initiated event (e.g. click callback)
  const googleWindow = window.open();

  // Do your async work
  fakeAjax(response => {
    // Change the URL of the window you created once you
    // know what the full URL is!
    googleWindow.location.replace(`https://google.com?q=${response}`);
  });
};

function fakeAjax(callback) {
  setTimeout(() => {
    callback('example');
  }, 1000);
}

Modern browsers will open the window with a blank page (often called about:blank), and assuming your async task to get the URL is fairly quick, the resulting UX is mostly fine. If you instead want to render a loading message (or anything) into the window while the user waits, you can use Data URIs.

window.open('data:text/html,<h1>Loading...<%2Fh1>');

R: Comment out block of code

I use RStudio or Emacs and always use the editor shortcuts available to comment regions. If this is not a possibility then you could use Paul's answer but this only works if your code is syntactically correct.

Here is another dirty way I came up with, wrap it in scan() and remove the result. It does store the comment in memory for a short while so it will probably not work with very large comments. Best still is to just put # signs in front of every line (possibly with editor shortcuts).

foo <- scan(what="character")
These are comments
These are still comments
Can also be code:
x <- 1:10
One line must be blank

rm(foo)

Call to undefined method mysqli_stmt::get_result

I know this was already answered as to what the actual problem is, however I want to offer a simple workaround.

I wanted to use the get_results() method however I didn't have the driver, and I'm not somewhere I can get that added. So, before I called

$stmt->bind_results($var1,$var2,$var3,$var4...etc);

I created an empty array, and then just bound the results as keys in that array:

$result = array();
$stmt->bind_results($result['var1'],$result['var2'],$result['var3'],$result['var4']...etc);

so that those results could easily be passed into methods or cast to an object for further use.

Hope this helps anyone who's looking to do something similar.

how to run command "mysqladmin flush-hosts" on Amazon RDS database Server instance?

Login to any other EC2 instance you have that has access to the RDS instance in question and has mysqladmin installed and run

mysqladmin -h <RDS ENDPOINT URL> -P 3306 -u <USER> -p flush-hosts

you will be prompted for your password

MongoDB running but can't connect using shell

If your bind_ip is set to anything other than 127.0.0.1 then you'll need to add the ip explicitly even from the local machine. So simply use the same method that you're using on the remote box on the local box. At least that's what did it for me.

Confused about UPDLOCK, HOLDLOCK

Why would UPDLOCK block selects? The Lock Compatibility Matrix clearly shows N for the S/U and U/S contention, as in No Conflict.

As for the HOLDLOCK hint the documentation states:

HOLDLOCK: Is equivalent to SERIALIZABLE. For more information, see SERIALIZABLE later in this topic.

...

SERIALIZABLE: ... The scan is performed with the same semantics as a transaction running at the SERIALIZABLE isolation level...

and the Transaction Isolation Level topic explains what SERIALIZABLE means:

No other transactions can modify data that has been read by the current transaction until the current transaction completes.

Other transactions cannot insert new rows with key values that would fall in the range of keys read by any statements in the current transaction until the current transaction completes.

Therefore the behavior you see is perfectly explained by the product documentation:

UPDLOCK does not block concurrent SELECT nor INSERT, but blocks any UPDATE or DELETE of the rows selected by T1
HOLDLOCK means SERALIZABLE and therefore allows SELECTS, but blocks UPDATE and DELETES of the rows selected by T1, as well as any INSERT in the range selected by T1 (which is the entire table, therefore any insert).
(UPDLOCK, HOLDLOCK): your experiment does not show what would block in addition to the case above, namely another transaction with UPDLOCK in T2:
SELECT * FROM dbo.Test WITH (UPDLOCK) WHERE ...
TABLOCKX no need for explanations

The real question is what are you trying to achieve? Playing with lock hints w/o an absolute complete 110% understanding of the locking semantics is begging for trouble...

After OP edit:

I would like to select rows from a table and prevent the data in that table from being modified while I am processing it.

The you should use one of the higher transaction isolation levels. REPEATABLE READ will prevent the data you read from being modified. SERIALIZABLE will prevent the data you read from being modified and new data from being inserted. Using transaction isolation levels is the right approach, as opposed to using query hints. Kendra Little has a nice poster exlaining the isolation levels.

how to bypass Access-Control-Allow-Origin?

Warning, Chrome (and other browsers) will complain that multiple ACAO headers are set if you follow some of the other answers.

The error will be something like XMLHttpRequest cannot load ____. The 'Access-Control-Allow-Origin' header contains multiple values '____, ____, ____', but only one is allowed. Origin '____' is therefore not allowed access.

Try this:

$http_origin = $_SERVER['HTTP_ORIGIN'];

$allowed_domains = array(
  'http://domain1.com',
  'http://domain2.com',
);

if (in_array($http_origin, $allowed_domains))
{  
    header("Access-Control-Allow-Origin: $http_origin");
}

Java SSLException: hostname in certificate didn't match

The concern is we should not use ALLOW_ALL_HOSTNAME_VERIFIER.

How about I implement my own hostname verifier?

class MyHostnameVerifier implements org.apache.http.conn.ssl.X509HostnameVerifier
{
    @Override
    public boolean verify(String host, SSLSession session) {
        String sslHost = session.getPeerHost();
        System.out.println("Host=" + host);
        System.out.println("SSL Host=" + sslHost);    
        if (host.equals(sslHost)) {
            return true;
        } else {
            return false;
        }
    }

    @Override
    public void verify(String host, SSLSocket ssl) throws IOException {
        String sslHost = ssl.getInetAddress().getHostName();
        System.out.println("Host=" + host);
        System.out.println("SSL Host=" + sslHost);    
        if (host.equals(sslHost)) {
            return;
        } else {
            throw new IOException("hostname in certificate didn't match: " + host + " != " + sslHost);
        }
    }

    @Override
    public void verify(String host, X509Certificate cert) throws SSLException {
        throw new SSLException("Hostname verification 1 not implemented");
    }

    @Override
    public void verify(String host, String[] cns, String[] subjectAlts) throws SSLException {
        throw new SSLException("Hostname verification 2 not implemented");
    }
}

Let's test against https://www.rideforrainbows.org/ which is hosted on a shared server.

public static void main (String[] args) throws Exception {
    //org.apache.http.conn.ssl.SSLSocketFactory sf = org.apache.http.conn.ssl.SSLSocketFactory.getSocketFactory();
    //sf.setHostnameVerifier(new MyHostnameVerifier());
    //org.apache.http.conn.scheme.Scheme sch = new Scheme("https", 443, sf);

    org.apache.http.client.HttpClient client = new DefaultHttpClient();
    //client.getConnectionManager().getSchemeRegistry().register(sch);
    org.apache.http.client.methods.HttpPost post = new HttpPost("https://www.rideforrainbows.org/");
    org.apache.http.HttpResponse response = client.execute(post);
    java.io.InputStream is = response.getEntity().getContent();
    java.io.BufferedReader rd = new java.io.BufferedReader(new java.io.InputStreamReader(is));
    String line;
    while ((line = rd.readLine()) != null) { 
        System.out.println(line);
    }
}

SSLException:

Exception in thread "main" javax.net.ssl.SSLException: hostname in certificate didn't match: www.rideforrainbows.org != stac.rt.sg OR stac.rt.sg OR www.stac.rt.sg
at org.apache.http.conn.ssl.AbstractVerifier.verify(AbstractVerifier.java:231)
...

Do with MyHostnameVerifier:

public static void main (String[] args) throws Exception {
    org.apache.http.conn.ssl.SSLSocketFactory sf = org.apache.http.conn.ssl.SSLSocketFactory.getSocketFactory();
    sf.setHostnameVerifier(new MyHostnameVerifier());
    org.apache.http.conn.scheme.Scheme sch = new Scheme("https", 443, sf);

    org.apache.http.client.HttpClient client = new DefaultHttpClient();
    client.getConnectionManager().getSchemeRegistry().register(sch);
    org.apache.http.client.methods.HttpPost post = new HttpPost("https://www.rideforrainbows.org/");
    org.apache.http.HttpResponse response = client.execute(post);
    java.io.InputStream is = response.getEntity().getContent();
    java.io.BufferedReader rd = new java.io.BufferedReader(new java.io.InputStreamReader(is));
    String line;
    while ((line = rd.readLine()) != null) { 
        System.out.println(line);
    }
}

Shows:

Host=www.rideforrainbows.org
SSL Host=www.rideforrainbows.org

At least I have the logic to compare (Host == SSL Host) and return true.

The above source code is working for httpclient-4.2.3.jar and httpclient-4.3.3.jar.

What ports need to be open for TortoiseSVN to authenticate (clear text) and commit?

What's the first part of your Subversion repository URL?

If your URL looks like: http://subversion/repos/, then you're probably going over Port 80.
If your URL looks like: https://subversion/repos/, then you're probably going over Port 443.
If your URL looks like: svn://subversion/, then you're probably going over Port 3690.
If your URL looks like: svn+ssh://subversion/repos/, then you're probably going over Port 22.
If your URL contains a port number like: http://subversion/repos:8080, then you're using that port.

I can't guarantee the first four since it's possible to reconfigure everything to use different ports, of if you go through a proxy of some sort.

If you're using a VPN, you may have to configure your VPN client to reroute these to their correct ports. A lot of places don't configure their correctly VPNs to do this type of proxying. It's either because they have some sort of anal-retentive IT person who's being overly security conscious, or because they simply don't know any better. Even worse, they'll give you a client where this stuff can't be reconfigured.

The only way around that is to log into a local machine over the VPN, and then do everything from that system.

Open page in new window without popup blocking

PS> I posted this answer on a related question. Here's how I got round the issue of my async ajax request losing the trusted context:

I opened the popup directly on the users click, directed the url to about:blank and got a handle on that window. You could probably direct the popup to a 'loading' url while your ajax request is made

var myWindow = window.open("about:blank",'name','height=500,width=550');

Then, when my request is successful, I open my callback url in the window

function showWindow(win, url) {
     win.open(url,'name','height=500,width=550');
}

JSON Post with Customized HTTPHeader Field

Just wanted to update this thread for future developers.

JQuery >1.12 Now supports being able to change every little piece of the request through JQuery.post ($.post({...}). see second function signature in https://api.jquery.com/jquery.post/

How to automatically allow blocked content in IE?

If you are to use the

<!-- saved from url=(0014)about:internet -->

<!-- saved from url=(0016)http://localhost -->

make sure the HTML file is saved in windows/dos format with "\r\n" as line breaks after the statement. Otherwise I couldn't make it work.

inject bean reference into a Quartz job in Spring?

A simple way to do it would be to just annotate the Quartz Jobs with @Component annotation, and then Spring will do all the DI magic for you, as it is now recognized as a Spring bean. I had to do something similar for an AspectJ aspect - it was not a Spring bean until I annotated it with the Spring @Component stereotype.

A fatal error has been detected by the Java Runtime Environment: SIGSEGV, libjvm

Here is your relief for the problem :

I have a problem of running different versions of STS this morning, the application crash with the similar way as the question did.

Excerpt of my log file.

A fatal error has been detected by the Java Runtime Environment:
#a
#  SIGSEGV (0xb) at pc=0x00007f459db082a1, pid=4577, tid=139939015632640
#
# JRE version: 6.0_30-b12
# Java VM: Java HotSpot(TM) 64-Bit Server VM 
(20.5-b03 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# C  [libsoup-2.4.so.1+0x6c2a1]  short+0x11

note that exception occured at # C [libsoup-2.4.so.1+0x6c2a1] short+0x11

Okay then little below the line:

R9 =0x00007f461829e550: <offset 0xa85550> in /usr/share/java/jdk1.6.0_30/jre/lib/amd64/server/libjvm.so at 0x00007f4617819000
R10=0x00007f461750f7c0 is pointing into the stack for thread: 0x00007f4610008000
R11=0x00007f459db08290: soup_session_feature_detach+0 in /usr/lib/x86_64-linux-gnu/libsoup-2.4.so.1 at 0x00007f459da9c000
R12=0x0000000000000000 is an unknown value
R13=0x000000074404c840 is an oop
{method}

This line tells you where the actual bug or crash is to investigate more on this crash issue please use below links to see more, but let's continue the crash investigation and how I resolved it and the novelty of this bug :)

links are :

a fATAL ERROR JAVA THIS ONE IS GREAT LOTS OF USER!

a fATAL ERROR JAVA 2

Okay, after that here's what I found out to casue this case and why it happens as general advise.

Most of the time, check that if you have installed, updated recently on Ubunu and Windows there are libraries like libsoup in linux which were the casuse of my crash.
Check also for a new hardware problem and try to investigate the Logfile which STS or Java generated and also syslog in linux by
```
tail - f /var/lib/messages or some other file
```

Then by carfully looking at those files the one you have the crash log for ... you can really solve the issue as follows:

sudo unlink /usr/lib/i386-linux-gnu/libsoup-2.4.so.1

sudo unlink /usr/lib/x86_64-linux-gnu/libsoup-2.4.so.1

Done !! Cheers!!

JavaScript is in array

Some browsers support Array.indexOf().

If not, you could augment the Array object via its prototype like so...

if (!Array.prototype.indexOf)
{
  Array.prototype.indexOf = function(searchElement /*, fromIndex */)
  {
    "use strict";

    if (this === void 0 || this === null)
      throw new TypeError();

    var t = Object(this);
    var len = t.length >>> 0;
    if (len === 0)
      return -1;

    var n = 0;
    if (arguments.length > 0)
    {
      n = Number(arguments[1]);
      if (n !== n) // shortcut for verifying if it's NaN
        n = 0;
      else if (n !== 0 && n !== (1 / 0) && n !== -(1 / 0))
        n = (n > 0 || -1) * Math.floor(Math.abs(n));
    }

    if (n >= len)
      return -1;

    var k = n >= 0
          ? n
          : Math.max(len - Math.abs(n), 0);

    for (; k < len; k++)
    {
      if (k in t && t[k] === searchElement)
        return k;
    }
    return -1;
  };
}

Source.

How do I configure the proxy settings so that Eclipse can download new plugins?

For me, I go to \eclipse\configuration.settings\org.eclipse.core.net.prefs set the property systemProxiesEnabled to true manually and restart eclipse.

Array initialization syntax when not in a declaration

I'll try to answer the why question: The Java array is very simple and rudimentary compared to classes like ArrayList, that are more dynamic. Java wants to know at declaration time how much memory should be allocated for the array. An ArrayList is much more dynamic and the size of it can vary over time.

If you initialize your array with the length of two, and later on it turns out you need a length of three, you have to throw away what you've got, and create a whole new array. Therefore the 'new' keyword.

In your first two examples, you tell at declaration time how much memory to allocate. In your third example, the array name becomes a pointer to nothing at all, and therefore, when it's initialized, you have to explicitly create a new array to allocate the right amount of memory.

I would say that (and if someone knows better, please correct me) the first example

AClass[] array = {object1, object2}

actually means

AClass[] array = new AClass[]{object1, object2};

but what the Java designers did, was to make quicker way to write it if you create the array at declaration time.

The suggested workarounds are good. If the time or memory usage is critical at runtime, use arrays. If it's not critical, and you want code that is easier to understand and to work with, use ArrayList.

Enable 'xp_cmdshell' SQL Server

For me, the only way on SQL 2008 R2 was this :

EXEC sp_configure 'Show Advanced Options', 1    
RECONFIGURE **WITH OVERRIDE**    
EXEC sp_configure 'xp_cmdshell', 1    
RECONFIGURE **WITH OVERRIDE**

Mapping many-to-many association table with extra column(s)

Since the SERVICE_USER table is not a pure join table, but has additional functional fields (blocked), you must map it as an entity, and decompose the many to many association between User and Service into two OneToMany associations : One User has many UserServices, and one Service has many UserServices.

You haven't shown us the most important part : the mapping and initialization of the relationships between your entities (i.e. the part you have problems with). So I'll show you how it should look like.

If you make the relationships bidirectional, you should thus have

class User {
    @OneToMany(mappedBy = "user")
    private Set<UserService> userServices = new HashSet<UserService>();
}

class UserService {
    @ManyToOne
    @JoinColumn(name = "user_id")
    private User user;

    @ManyToOne
    @JoinColumn(name = "service_code")
    private Service service;

    @Column(name = "blocked")
    private boolean blocked;
}

class Service {
    @OneToMany(mappedBy = "service")
    private Set<UserService> userServices = new HashSet<UserService>();
}

If you don't put any cascade on your relationships, then you must persist/save all the entities. Although only the owning side of the relationship (here, the UserService side) must be initialized, it's also a good practice to make sure both sides are in coherence.

User user = new User();
Service service = new Service();
UserService userService = new UserService();

user.addUserService(userService);
userService.setUser(user);

service.addUserService(userService);
userService.setService(service);

session.save(user);
session.save(service);
session.save(userService);

Google Geocoding API - REQUEST_DENIED

I found that in my case, calling to the service without secure protocol (meaning: http), after adding the key=API_KEY, cause this issue. Changing to https solved it.

If REST applications are supposed to be stateless, how do you manage sessions?

Stateless here means that state or meta data of request is not maintained on server side. By maintaining each request or user's state on server, it would lead to performance bottlenecks. Server is just requested with required attributes to perform any specific operations.

Coming to managing sessions, or giving customize experience to users, it requires to maintain some meta data or state of user likely user's preferences, past request history. This can be done by maintaining cookies, hidden attributes or into session object.

This can maintain or keep track of user's state in the application.

Hope this helps!

How to set username and password for SmtpClient object in .NET?

Since not all of my clients use authenticated SMTP accounts, I resorted to using the SMTP account only if app key values are supplied in web.config file.

Here is the VB code:

sSMTPUser = ConfigurationManager.AppSettings("SMTPUser")
sSMTPPassword = ConfigurationManager.AppSettings("SMTPPassword")

If sSMTPUser.Trim.Length > 0 AndAlso sSMTPPassword.Trim.Length > 0 Then
    NetClient.Credentials = New System.Net.NetworkCredential(sSMTPUser, sSMTPPassword)

    sUsingCredentialMesg = "(Using Authenticated Account) " 'used for logging purposes
End If

NetClient.Send(Message)

Download the Android SDK components for offline install

There is an open source offline package deployer for Windows which I wrote:

http://siddharthbarman.com/apd/

You can try this out to see if it meets your needs.

Preventing iframe caching in browser

I found this problem in the latest Chrome as well as the latest Safari on the Mac OS X as of Mar 17, 2016. None of the fixes above worked for me, including assigning src to empty and then back to some site, or adding in some randomly-named "name" parameter, or adding in a random number on the end of the URL after the hash, or assigning the content window href to the src after assigning the src.

In my case, it was because I was using Javascript to update the IFRAME, and only switching the hash in the URL.

The workaround in my case was that I created an interim URL that had a 0 second meta redirect to that other page. It happens so fast that I hardly notice the screen flash. Plus, I made the background color of the interim page the same as the other page, and so you notice it even less.

Avoid browser popup blockers

I didn't want to make the new page unless the callback returned successfully, so I did this to simulate the user click:

function submitAndRedirect {
  apiCall.then(({ redirect }) => {
      const a = document.createElement('a');
      a.href = redirect;
      a.target = '_blank';
      document.body.appendChild(a);
      a.click();
      document.body.removeChild(a);
  });
}

Using Javamail to connect to Gmail smtp server ignores specified port and tries to use 25

Maybe useful for anyone else running into this issue: When setting the port on the properties:

props.put("mail.smtp.port", smtpPort);

..make sure to use a string object. Using a numeric (ie Long) object will cause this statement to seemingly have no effect.

Java - escape string to prevent SQL injection

After searching an testing alot of solution for prevent sqlmap from sql injection, in case of legacy system which cant apply prepared statments every where.

java-security-cross-site-scripting-xss-and-sql-injection topic WAS THE SOLUTION

i tried @Richard s solution but did not work in my case. i used a filter

The goal of this filter is to wrapper the request into an own-coded wrapper MyHttpRequestWrapper which transforms:

the HTTP parameters with special characters (<, >, ‘, …) into HTML codes via the org.springframework.web.util.HtmlUtils.htmlEscape(…) method. Note: There is similar classe in Apache Commons : org.apache.commons.lang.StringEscapeUtils.escapeHtml(…) the SQL injection characters (‘, “, …) via the Apache Commons classe org.apache.commons.lang.StringEscapeUtils.escapeSql(…)

<filter>
<filter-name>RequestWrappingFilter</filter-name>
<filter-class>com.huo.filter.RequestWrappingFilter</filter-class>
</filter>

<filter-mapping>
<filter-name>RequestWrappingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>




package com.huo.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletReponse;
import javax.servlet.http.HttpServletRequest;

public class RequestWrappingFilter implements Filter{

    public void doFilter(ServletRequest req, ServletReponse res, FilterChain chain) throws IOException, ServletException{
        chain.doFilter(new MyHttpRequestWrapper(req), res);
    }

    public void init(FilterConfig config) throws ServletException{
    }

    public void destroy() throws ServletException{
    }
}




package com.huo.filter;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

import org.apache.commons.lang.StringEscapeUtils;

public class MyHttpRequestWrapper extends HttpServletRequestWrapper{
    private Map<String, String[]> escapedParametersValuesMap = new HashMap<String, String[]>();

    public MyHttpRequestWrapper(HttpServletRequest req){
        super(req);
    }

    @Override
    public String getParameter(String name){
        String[] escapedParameterValues = escapedParametersValuesMap.get(name);
        String escapedParameterValue = null; 
        if(escapedParameterValues!=null){
            escapedParameterValue = escapedParameterValues[0];
        }else{
            String parameterValue = super.getParameter(name);

            // HTML transformation characters
            escapedParameterValue = org.springframework.web.util.HtmlUtils.htmlEscape(parameterValue);

            // SQL injection characters
            escapedParameterValue = StringEscapeUtils.escapeSql(escapedParameterValue);

            escapedParametersValuesMap.put(name, new String[]{escapedParameterValue});
        }//end-else

        return escapedParameterValue;
    }

    @Override
    public String[] getParameterValues(String name){
        String[] escapedParameterValues = escapedParametersValuesMap.get(name);
        if(escapedParameterValues==null){
            String[] parametersValues = super.getParameterValues(name);
            escapedParameterValue = new String[parametersValues.length];

            // 
            for(int i=0; i<parametersValues.length; i++){
                String parameterValue = parametersValues[i];
                String escapedParameterValue = parameterValue;

                // HTML transformation characters
                escapedParameterValue = org.springframework.web.util.HtmlUtils.htmlEscape(parameterValue);

                // SQL injection characters
                escapedParameterValue = StringEscapeUtils.escapeSql(escapedParameterValue);

                escapedParameterValues[i] = escapedParameterValue;
            }//end-for

            escapedParametersValuesMap.put(name, escapedParameterValues);
        }//end-else

        return escapedParameterValues;
    }
}

Load and execution sequence of a web page?

The chosen answer looks like does not apply to modern browsers, at least on Firefox 52. What I observed is that the requests of loading resources like css, javascript are issued before HTML parser reaches the element, for example

<html>
  <head>
    <!-- prints the date before parsing and blocks HTMP parsering -->
    <script>
      console.log("start: " + (new Date()).toISOString());
      for(var i=0; i<1000000000; i++) {};
    </script>

    <script src="jquery.js" type="text/javascript"></script>
    <script src="abc.js" type="text/javascript"></script>
    <link rel="stylesheets" type="text/css" href="abc.css"></link>
    <style>h2{font-wight:bold;}</style>
    <script>
      $(document).ready(function(){
      $("#img").attr("src", "kkk.png");
     });
   </script>
 </head>
 <body>
   <img id="img" src="abc.jpg" style="width:400px;height:300px;"/>
   <script src="kkk.js" type="text/javascript"></script>
   </body>
</html>

What I found that the start time of requests to load css and javascript resources were not being blocked. Looks like Firefox has a HTML scan, and identify key resources(img resource is not included) before starting to parse the HTML.

Linux Process States

Assuming your process is a single thread, and that you're using blocking I/O, your process will block waiting for the I/O to complete. The kernel will pick another process to run in the meantime based on niceness, priority, last run time, etc. If there are no other runnable processes, the kernel won't run any; instead, it'll tell the hardware the machine is idle (which will result in lower power consumption).

Processes that are waiting for I/O to complete typically show up in state D in, e.g., ps and top.

SVN Error: Commit blocked by pre-commit hook (exit code 1) with output: Error: n/a (6)

Could it be that you have not entered a commit message? According to their twitter feed: "New functionality added. Block users from committing work without writing a log message. Find in the resources section of your control panel".

Dynamically set value of a file input

I ended up doing something like this for AngularJS in case someone stumbles across this question:

const imageElem = angular.element('#awardImg');

if (imageElem[0].files[0])
    vm.award.imageElem = imageElem;
    vm.award.image = imageElem[0].files[0];

And then:

if (vm.award.imageElem)
    $('#awardImg').replaceWith(vm.award.imageElem);
    delete vm.award.imageElem;

Best way to use Google's hosted jQuery, but fall back to my hosted library on Google fail

Here is a great explaination on this!

Also implements loading delays and timeouts!

http://happyworm.com/blog/2010/01/28/a-simple-and-robust-cdn-failover-for-jquery-14-in-one-line/

Java executors: how to be notified, without blocking, when a task completes?

Define a callback interface to receive whatever parameters you want to pass along in the completion notification. Then invoke it at the end of the task.

You could even write a general wrapper for Runnable tasks, and submit these to ExecutorService. Or, see below for a mechanism built into Java 8.

class CallbackTask implements Runnable {

  private final Runnable task;

  private final Callback callback;

  CallbackTask(Runnable task, Callback callback) {
    this.task = task;
    this.callback = callback;
  }

  public void run() {
    task.run();
    callback.complete();
  }

}

With CompletableFuture, Java 8 included a more elaborate means to compose pipelines where processes can be completed asynchronously and conditionally. Here's a contrived but complete example of notification.

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;

public class GetTaskNotificationWithoutBlocking {

  public static void main(String... argv) throws Exception {
    ExampleService svc = new ExampleService();
    GetTaskNotificationWithoutBlocking listener = new GetTaskNotificationWithoutBlocking();
    CompletableFuture<String> f = CompletableFuture.supplyAsync(svc::work);
    f.thenAccept(listener::notify);
    System.out.println("Exiting main()");
  }

  void notify(String msg) {
    System.out.println("Received message: " + msg);
  }

}

class ExampleService {

  String work() {
    sleep(7000, TimeUnit.MILLISECONDS); /* Pretend to be busy... */
    char[] str = new char[5];
    ThreadLocalRandom current = ThreadLocalRandom.current();
    for (int idx = 0; idx < str.length; ++idx)
      str[idx] = (char) ('A' + current.nextInt(26));
    String msg = new String(str);
    System.out.println("Generated message: " + msg);
    return msg;
  }

  public static void sleep(long average, TimeUnit unit) {
    String name = Thread.currentThread().getName();
    long timeout = Math.min(exponential(average), Math.multiplyExact(10, average));
    System.out.printf("%s sleeping %d %s...%n", name, timeout, unit);
    try {
      unit.sleep(timeout);
      System.out.println(name + " awoke.");
    } catch (InterruptedException abort) {
      Thread.currentThread().interrupt();
      System.out.println(name + " interrupted.");
    }
  }

  public static long exponential(long avg) {
    return (long) (avg * -Math.log(1 - ThreadLocalRandom.current().nextDouble()));
  }

}

How to lazy load images in ListView in Android

public class ImageDownloader {

Map<String, Bitmap> imageCache;

public ImageDownloader() {
    imageCache = new HashMap<String, Bitmap>();

}

// download function
public void download(String url, ImageView imageView) {
    if (cancelPotentialDownload(url, imageView)) {

        // Caching code right here
        String filename = String.valueOf(url.hashCode());
        File f = new File(getCacheDirectory(imageView.getContext()),
                filename);

        // Is the bitmap in our memory cache?
        Bitmap bitmap = null;

        bitmap = (Bitmap) imageCache.get(f.getPath());

        if (bitmap == null) {

            bitmap = BitmapFactory.decodeFile(f.getPath());

            if (bitmap != null) {
                imageCache.put(f.getPath(), bitmap);
            }

        }
        // No? download it
        if (bitmap == null) {
            try {
                BitmapDownloaderTask task = new BitmapDownloaderTask(
                        imageView);
                DownloadedDrawable downloadedDrawable = new DownloadedDrawable(
                        task);
                imageView.setImageDrawable(downloadedDrawable);
                task.execute(url);
            } catch (Exception e) {
                Log.e("Error==>", e.toString());
            }

        } else {
            // Yes? set the image
            imageView.setImageBitmap(bitmap);
        }
    }
}

// cancel a download (internal only)
private static boolean cancelPotentialDownload(String url,
        ImageView imageView) {
    BitmapDownloaderTask bitmapDownloaderTask = getBitmapDownloaderTask(imageView);

    if (bitmapDownloaderTask != null) {
        String bitmapUrl = bitmapDownloaderTask.url;
        if ((bitmapUrl == null) || (!bitmapUrl.equals(url))) {
            bitmapDownloaderTask.cancel(true);
        } else {
            // The same URL is already being downloaded.
            return false;
        }
    }
    return true;
}

// gets an existing download if one exists for the imageview
private static BitmapDownloaderTask getBitmapDownloaderTask(
        ImageView imageView) {
    if (imageView != null) {
        Drawable drawable = imageView.getDrawable();
        if (drawable instanceof DownloadedDrawable) {
            DownloadedDrawable downloadedDrawable = (DownloadedDrawable) drawable;
            return downloadedDrawable.getBitmapDownloaderTask();
        }
    }
    return null;
}

// our caching functions
// Find the dir to save cached images
private static File getCacheDirectory(Context context) {
    String sdState = android.os.Environment.getExternalStorageState();
    File cacheDir;

    if (sdState.equals(android.os.Environment.MEDIA_MOUNTED)) {
        File sdDir = android.os.Environment.getExternalStorageDirectory();

        // TODO : Change your diretcory here
        cacheDir = new File(sdDir, "data/ToDo/images");
    } else
        cacheDir = context.getCacheDir();

    if (!cacheDir.exists())
        cacheDir.mkdirs();
    return cacheDir;
}

private void writeFile(Bitmap bmp, File f) {
    FileOutputStream out = null;

    try {
        out = new FileOutputStream(f);
        bmp.compress(Bitmap.CompressFormat.PNG, 80, out);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            if (out != null)
                out.close();
        } catch (Exception ex) {
        }
    }
}

// download asynctask
public class BitmapDownloaderTask extends AsyncTask<String, Void, Bitmap> {
    private String url;
    private final WeakReference<ImageView> imageViewReference;

    public BitmapDownloaderTask(ImageView imageView) {
        imageViewReference = new WeakReference<ImageView>(imageView);
    }

    @Override
    // Actual download method, run in the task thread
    protected Bitmap doInBackground(String... params) {
        // params comes from the execute() call: params[0] is the url.
        url = (String) params[0];
        return downloadBitmap(params[0]);
    }

    @Override
    // Once the image is downloaded, associates it to the imageView
    protected void onPostExecute(Bitmap bitmap) {
        if (isCancelled()) {
            bitmap = null;
        }

        if (imageViewReference != null) {
            ImageView imageView = imageViewReference.get();
            BitmapDownloaderTask bitmapDownloaderTask = getBitmapDownloaderTask(imageView);
            // Change bitmap only if this process is still associated with
            // it
            if (this == bitmapDownloaderTask) {
                imageView.setImageBitmap(bitmap);

                // cache the image

                String filename = String.valueOf(url.hashCode());
                File f = new File(
                        getCacheDirectory(imageView.getContext()), filename);

                imageCache.put(f.getPath(), bitmap);

                writeFile(bitmap, f);
            }
        }
    }

}

static class DownloadedDrawable extends ColorDrawable {
    private final WeakReference<BitmapDownloaderTask> bitmapDownloaderTaskReference;

    public DownloadedDrawable(BitmapDownloaderTask bitmapDownloaderTask) {
        super(Color.WHITE);
        bitmapDownloaderTaskReference = new WeakReference<BitmapDownloaderTask>(
                bitmapDownloaderTask);
    }

    public BitmapDownloaderTask getBitmapDownloaderTask() {
        return bitmapDownloaderTaskReference.get();
    }
}

// the actual download code
static Bitmap downloadBitmap(String url) {
    HttpParams params = new BasicHttpParams();
    params.setParameter(CoreProtocolPNames.PROTOCOL_VERSION,
            HttpVersion.HTTP_1_1);
    HttpClient client = new DefaultHttpClient(params);
    final HttpGet getRequest = new HttpGet(url);

    try {
        HttpResponse response = client.execute(getRequest);
        final int statusCode = response.getStatusLine().getStatusCode();
        if (statusCode != HttpStatus.SC_OK) {
            Log.w("ImageDownloader", "Error " + statusCode
                    + " while retrieving bitmap from " + url);
            return null;
        }

        final HttpEntity entity = response.getEntity();
        if (entity != null) {
            InputStream inputStream = null;
            try {
                inputStream = entity.getContent();
                final Bitmap bitmap = BitmapFactory
                        .decodeStream(inputStream);
                return bitmap;
            } finally {
                if (inputStream != null) {
                    inputStream.close();
                }
                entity.consumeContent();
            }
        }
    } catch (Exception e) {
        // Could provide a more explicit error message for IOException or
        // IllegalStateException
        getRequest.abort();
        Log.w("ImageDownloader", "Error while retrieving bitmap from "
                + url + e.toString());
    } finally {
        if (client != null) {
            // client.close();
        }
    }
    return null;
 }
}

Creating a blocking Queue<T> in .NET?

Well, you might look at System.Threading.Semaphore class. Other than that - no, you have to make this yourself. AFAIK there is no such built-in collection.

Cookie blocked/not saved in IFRAME in Internet Explorer

This finally worked for me (after a lot of hastle and generating some policies using IBMs policy generator). You can downlod the policy generator here: http://www.softpedia.com/get/Security/Security-Related/P3P-Policy-Editor.shtml

I was not able to download the generator from the official IBM website any more.

I created these files in the root folder of my Web-App

/index.php
/w3c/policy.html (Human readable format)
/w3c/p3p.xml
/w3c/policy.p3p

Index.php: Just send an additional header:

header('P3P: policyref="/w3c/p3p.xml", CP="ALL DSP NID CURa ADMa DEVa HISa OTPa OUR NOR NAV DEM"');

Content of p3p.xml

<META>
    <POLICY-REFERENCES>
        <POLICY-REF about="/w3c/policy.p3p#App">
            <INCLUDE>/</INCLUDE>
            <COOKIE-INCLUDE/>
        </POLICY-REF>
    </POLICY-REFERENCES>
</META>

Content of my policy.html file

_x000D_

<html>_x000D_
<head>_x000D_
<STYLE type="text/css">_x000D_
title { color: #3333FF}_x000D_
</STYLE>_x000D_
<title>Privacy Statement for YOUR COMPANY NAME</title>_x000D_
</head>_x000D_
<body>_x000D_
<h1 class="title">Privacy Policy</h1>_x000D_
<!-- "About Us" section of privacy policy -->_x000D_
<h2>About Us</h2>_x000D_
<p>This is a privacy policy for YOUR COMPANY NAME._x000D_
Our homepage on the Web is located at <a href="YOURWEBSITE">_x000D_
YOURWEBSITE</a>._x000D_
The full text of our privacy policy is available on the Web at _x000D_
<a href="ABSOLUTE URL OF THIS FILE">_x000D_
ABSOLUTE URL OF THIS FILE</a>_x000D_
This policy does not tell users where they can go to exercise their opt-in or opt-out options._x000D_
<p>We invite you to contact us if you have questions about this policy._x000D_
You may contact us by mail at the following address:_x000D_
<pre>FIRSTNAME LASTNAME_x000D_
YOUR ADDRESS HERE_x000D_
</pre>_x000D_
<p>You may contact us by e-mail at _x000D_
<a href="mailto:[email protected]">_x000D_
[email protected]</a>. _x000D_
You may call us at TELEPHONENUMBER._x000D_
<!-- "Privacy Seals" section of privacy policy -->_x000D_
<h2>Dispute Resolution and Privacy Seals</h2>_x000D_
<p>We have the following privacy seals and/or dispute resolution mechanisms._x000D_
If you think we have not followed our privacy policy in some way, they can help you resolve your concern._x000D_
<ul>_x000D_
<li>_x000D_
<b>Dispute</b>:_x000D_
Contact us for further information_x000D_
</ul>_x000D_
<!-- "Additional information" section of privacy policy -->_x000D_
<h2>Additional Information</h2>_x000D_
<p>_x000D_
This policy is valid for 1 day from the time that it is loaded by a client._x000D_
</p>_x000D_
<!-- "Data Collection" section of privacy policy -->_x000D_
<h2>Data Collection</h2>_x000D_
<p>P3P policies declare the data they collect in groups (also referred to as "statements")._x000D_
This policy contains 1 data group._x000D_
<hr width="50%" align="center">_x000D_
<h3>Group "App control data"</h3>_x000D_
<p>We collect the following information:_x000D_
<ul>_x000D_
<li>HTTP cookies</li>_x000D_
</ul>_x000D_
<p>This data will be used for the following purposes:</p>_x000D_
<ul>_x000D_
<li>Completion and support of the current activity.</li>_x000D_
<li>Web site and system administration.</li>_x000D_
<li>Research and development.</li>_x000D_
<li>Historical preservation.</li>_x000D_
<li>Other purposes<p>Control Flow of the application</p></li>_x000D_
</ul>_x000D_
<p>This data will be used by ourselves and our agents._x000D_
<p>The data in this group has been marked as non-identifiable. This means that there is no_x000D_
reasonable way for the site to identify the individual person this data was collected from._x000D_
<p>The following explanation is provided for why this data is collected:</p>_x000D_
<blockquote>This cookie data is only used to control the application within an iframe (e.g. a Facebook App)</blockquote>_x000D_
<!-- "Use of Cookies" section of privacy policy -->_x000D_
<hr width="50%" align="center">_x000D_
<h2>Cookies</h2>_x000D_
<p>Cookies are a technology which can be used to provide you with tailored information from a Web site. A cookie is an element of data that a Web site can send to your browser, which may then store it on your system. You can set your browser to notify you when you receive a cookie, giving you the chance to decide whether to accept it._x000D_
<p>Our site makes use of cookies._x000D_
Cookies are used for the following purposes:_x000D_
<ul>_x000D_
<li>Site administration_x000D_
<li>Completing the user's current activity_x000D_
<li>Research and development_x000D_
<li>Other_x000D_
(Control Flow of the application)_x000D_
</ul>_x000D_
<!-- "Compact Policy Explanation" section of privacy policy -->_x000D_
<hr width="50%" align="center">_x000D_
<h2>Compact Policy Summary</h2>_x000D_
<p>The compact policy which corresponds to this policy is:_x000D_
<pre>_x000D_
    CP="ALL DSP NID CURa ADMa DEVa HISa OTPa OUR NOR NAV"_x000D_
</pre>_x000D_
<p>The following table explains the meaning of each field in the compact policy._x000D_
<center><table width="80%" border="1" cols="2">_x000D_
<tr><td align="center" valign="top" width="20%"><b>Field</b></td><td align="center" valign="top" width="80%"><b>Meaning</b></td></tr>_x000D_
<tr><td align="left" valign="top" width="20%"><tt>CP=</tt></td>_x000D_
<td align="left" valign="top" width="80%">This is the compact policy header; it indicates that what follows is a P3P compact policy.</td></tr>_x000D_
<tr><td align="left" valign="top" width="20%"><tt>ALL</tt></td>_x000D_
<td align="left" valign="top" width="80%">_x000D_
Access to all collected information is available._x000D_
</td></tr>_x000D_
<tr><td align="left" valign="top" width="20%"><tt>DSP</tt></td>_x000D_
<td align="left" valign="top" width="80%">_x000D_
The policy contains at least one dispute-resolution mechanism._x000D_
</td></tr>_x000D_
<tr><td align="left" valign="top" width="20%"><tt>NID</tt></td>_x000D_
<td align="left" valign="top" width="80%">_x000D_
The information collected is not personally identifiable._x000D_
</td></tr>_x000D_
<tr><td align="left" valign="top" width="20%"><tt>CURa</tt></td>_x000D_
<td align="left" valign="top" width="80%">_x000D_
The data is used for completion of the current activity._x000D_
</td></tr>_x000D_
<tr><td align="left" valign="top" width="20%"><tt>ADMa</tt></td>_x000D_
<td align="left" valign="top" width="80%">_x000D_
The data is used for site administration._x000D_
</td></tr>_x000D_
<tr><td align="left" valign="top" width="20%"><tt>DEVa</tt></td>_x000D_
<td align="left" valign="top" width="80%">_x000D_
The data is used for research and development._x000D_
</td></tr>_x000D_
<tr><td align="left" valign="top" width="20%"><tt>HISa</tt></td>_x000D_
<td align="left" valign="top" width="80%">_x000D_
The data is used for historical archival purposes._x000D_
</td></tr>_x000D_
<tr><td align="left" valign="top" width="20%"><tt>OTPa</tt></td>_x000D_
<td align="left" valign="top" width="80%">_x000D_
The data is used for other purposes._x000D_
</td></tr>_x000D_
<tr><td align="left" valign="top" width="20%"><tt>OUR</tt></td>_x000D_
<td align="left" valign="top" width="80%">_x000D_
The data is given to ourselves and our agents._x000D_
</td></tr>_x000D_
<tr><td align="left" valign="top" width="20%"><tt>NOR</tt></td>_x000D_
<td align="left" valign="top" width="80%">_x000D_
The data is not kept beyond the current transaction._x000D_
</td></tr>_x000D_
<tr><td align="left" valign="top" width="20%"><tt>NAV</tt></td>_x000D_
<td align="left" valign="top" width="80%">_x000D_
Navigation and clickstream data is collected._x000D_
</td></tr>_x000D_
</table></center>_x000D_
<p>The compact policy is sent by the Web server along with the cookies it describes._x000D_
For more information, see the P3P deployment guide at <a href="http://www.w3.org/TR/p3pdeployment">http://www.w3.org/TR/p3pdeployment</a>._x000D_
<!-- "Policy Evaluation" section of privacy policy -->_x000D_
<hr width="50%" align="center">_x000D_
<h2>Policy Evaluation</h2>_x000D_
<p>Microsoft Internet Explorer 6 will evaluate this policy's compact policy whenever it is used with a cookie._x000D_
The actions IE will take depend on what privacy level the user has selected in their browser (Low, Medium, Medium High, or High; the default is Medium._x000D_
In addition, IE will examine whether the cookie's policy is considered satisfactory or unsatisfactory, whether the cookie is a session cookie or a persistent cookie, and whether the cookie is used in a first-party or third-party context._x000D_
This section will attempt to evaluate this policy's compact policy against Microsoft's stated behavior for IE6._x000D_
<p><b>Note:</b> this evaluation is currently experimental and should not be considered a substitute for testing with a real Web browser._x000D_
<p><b>Satisfactory policy</b>: this compact policy is considered <em>satisfactory</em> according to the rules defined by Internet Explorer 6._x000D_
IE6 will accept cookies accompanied by this policy under the High, Medium High, Medium, Low, and Accept All Cookies settings._x000D_
</body></html>

_x000D_

Content of policy.p3p

<?xml version="1.0"?>
<POLICIES xmlns="http://www.w3.org/2002/01/P3Pv1">
    <!-- Generated by IBM P3P Policy Editor version Beta 1.12 built 2/27/04 1:19 PM -->

    <!-- Expiry information for this policy -->
    <EXPIRY max-age="86400"/>

<POLICY
    name="App"
    discuri="ABSOLUTE URL TO policy.html"
    xml:lang="de">
    <!-- Description of the entity making this policy statement. -->
    <ENTITY>
    <DATA-GROUP>
<DATA ref="#business.name">COMPANY NAME</DATA>
<DATA ref="#business.contact-info.online.email">[email protected]</DATA>
<DATA ref="#business.contact-info.online.uri">YOURWEBSITE</DATA>
<DATA ref="#business.contact-info.telecom.telephone.number">YOURPHONENUMBER</DATA>
<DATA ref="#business.contact-info.postal.organization">FIRSTNAME LASTNAME</DATA>
<DATA ref="#business.contact-info.postal.street">STREET</DATA>
<DATA ref="#business.contact-info.postal.city">CITY</DATA>
<DATA ref="#business.contact-info.postal.stateprov">STAGE</DATA>
<DATA ref="#business.contact-info.postal.postalcode">POSTALCODE</DATA>
<DATA ref="#business.contact-info.postal.country">Germany</DATA>
    </DATA-GROUP>
    </ENTITY>

    <!-- Disclosure -->
    <ACCESS><all/></ACCESS>


    <!-- Disputes -->
    <DISPUTES-GROUP>
        <DISPUTES resolution-type="service" service="YOURWEBSITE CONTACT FORM" short-description="Dispute">
            <LONG-DESCRIPTION>Contact us for further information</LONG-DESCRIPTION>
    <!-- No remedies specified -->
        </DISPUTES>
    </DISPUTES-GROUP>

    <!-- Statement for group "App control data" -->
    <STATEMENT>
        <EXTENSION optional="yes">
            <GROUP-INFO xmlns="http://www.software.ibm.com/P3P/editor/extension-1.0.html" name="App control data"/>
        </EXTENSION>

    <!-- Consequence -->
    <CONSEQUENCE>
This cookie data is only used to control the application within an iframe (e.g. a Facebook App)</CONSEQUENCE>

    <!-- Data in this statement is marked as being non-identifiable -->
    <NON-IDENTIFIABLE/>

    <!-- Use (purpose) -->
    <PURPOSE><admin/><current/><develop/><historical/><other-purpose>Control Flow of the application</other-purpose></PURPOSE>

    <!-- Recipients -->
    <RECIPIENT><ours/></RECIPIENT>

    <!-- Retention -->
    <RETENTION><no-retention/></RETENTION>

    <!-- Base dataschema elements. -->
    <DATA-GROUP>
    <DATA ref="#dynamic.cookies"><CATEGORIES><navigation/></CATEGORIES></DATA>
    </DATA-GROUP>
</STATEMENT>

<!-- End of policy -->
</POLICY>
</POLICIES>

Best way to detect when a user leaves a web page?

Mozilla Developer Network has a nice description and example of onbeforeunload.

If you want to warn the user before leaving the page if your page is dirty (i.e. if user has entered some data):

window.addEventListener('beforeunload', function(e) {
  var myPageIsDirty = ...; //you implement this logic...
  if(myPageIsDirty) {
    //following two lines will cause the browser to ask the user if they
    //want to leave. The text of this dialog is controlled by the browser.
    e.preventDefault(); //per the standard
    e.returnValue = ''; //required for Chrome
  }
  //else: user is allowed to leave without a warning dialog
});

The action or event has been blocked by Disabled Mode

From access help:

Stop Disabled Mode from blocking a query If you try to run an append query and it seems like nothing happens, check the Access status bar for the following message:

This action or event has been blocked by Disabled Mode.

To stop Disabled Mode from blocking the query, you must enable the database content. You use the Options button in the Message Bar to enable the query.

Enable the append query In the Message Bar, click Options. In the Microsoft Office Security Options dialog box, click Enable this content, and then click OK. If you don't see the Message Bar, it may be hidden. You can show it, unless it has also been disabled. If the Message Bar has been disabled, you can enable it.

Show the Message Bar If the Message Bar is already visible, you can skip this step.

On the Database Tools tab, in the Show/Hide group, select the Message Bar check box. If the Message Bar check box is disabled, you will have to enable it.

Enable the Message Bar If the Message Bar check box is enabled, you can skip this step.

Click the Microsoft Office Button , and then click Access Options. In the left pane of the Access Options dialog box, click Trust Center. In the right pane, under Microsoft Office Access Trust Center, click Trust Center Settings. In the left pane of the Trust Center dialog box, click Message Bar. In the right pane, click Show the Message Bar in all applications when content has been blocked, and then click OK. Close and reopen the database to apply the changed setting. Note When you enable the append query, you also enable all other database content.

For more information about Access security, see the article Help secure an Access 2007 database.

Responsive iframe using Bootstrap

Option 1

With Bootstrap 3.2 you can wrap each iframe in the responsive-embed wrapper of your choice:

http://getbootstrap.com/components/#responsive-embed

<!-- 16:9 aspect ratio -->
<div class="embed-responsive embed-responsive-16by9">
  <iframe class="embed-responsive-item" src="…"></iframe>
</div>

<!-- 4:3 aspect ratio -->
<div class="embed-responsive embed-responsive-4by3">
  <iframe class="embed-responsive-item" src="…"></iframe>
</div>

Option 2

If you don't want to wrap your iframes, you can use FluidVids https://github.com/toddmotto/fluidvids. See demo here: http://toddmotto.com/labs/fluidvids/

   <!-- fluidvids.js -->
    <script src="js/fluidvids.js"></script>
    <script>
    fluidvids.init({
      selector: ['iframe'],
      players: ['www.youtube.com', 'player.vimeo.com']
    });
    </script>

List append() in for loop

The list.append function does not return any value(but None), it just adds the value to the list you are using to call that method.

In the first loop round you will assign None (because the no-return of append) to a, then in the second round it will try to call a.append, as a is None it will raise the Exception you are seeing

You just need to change it to:

a=[]
for i in range(5):    
    a.append(i)
print(a)
# [0, 1, 2, 3, 4]

list.append is what is called a mutating or destructive method, i.e. it will destroy or mutate the previous object into a new one(or a new state).

If you would like to create a new list based in one list without destroying or mutating it you can do something like this:

a=['a', 'b', 'c']
result = a + ['d']

print result
# ['a', 'b', 'c', 'd']

print a
# ['a', 'b', 'c']

As a corollary only, you can mimic the append method by doing the following:

a=['a', 'b', 'c']
a = a + ['d']

print a
# ['a', 'b', 'c', 'd']

How to construct a WebSocket URI relative to the page URI?

Dead easy solution, ws and port, tested:

var ws = new WebSocket("ws://" + window.location.host + ":6666");

ws.onopen = function() { ws.send( .. etc

What can cause a “Resource temporarily unavailable” on sock send() command

Let'e me give an example:

client connect to server, and send 1MB data to server every 1 second.
server side accept a connection, and then sleep 20 second, without recv msg from client.So the tcp send buffer in the client side will be full.

Code in client side:

#include <arpa/inet.h>
#include <sys/socket.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#define exit_if(r, ...)                                                                          \
    if (r) {                                                                                     \
        printf(__VA_ARGS__);                                                                     \
        printf("%s:%d error no: %d error msg %s\n", __FILE__, __LINE__, errno, strerror(errno)); \
        exit(1);                                                                                 \
    }

void setNonBlock(int fd) {
    int flags = fcntl(fd, F_GETFL, 0);
    exit_if(flags < 0, "fcntl failed");
    int r = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
    exit_if(r < 0, "fcntl failed");
}

void test_full_sock_buf_1(){
    short port = 8000;
    struct sockaddr_in addr;
    memset(&addr, 0, sizeof addr);
    addr.sin_family = AF_INET;
    addr.sin_port = htons(port);
    addr.sin_addr.s_addr = INADDR_ANY;


    int fd = socket(AF_INET, SOCK_STREAM, 0);
    exit_if(fd<0, "create socket error");

    int ret = connect(fd, (struct sockaddr *) &addr, sizeof(struct sockaddr));
    exit_if(ret<0, "connect to server error");
    setNonBlock(fd);

    printf("connect to server success");

    const int LEN = 1024 * 1000;
    char msg[LEN];  // 1MB data
    memset(msg, 'a', LEN);

    for (int i = 0; i < 1000; ++i) {
        int len = send(fd, msg, LEN, 0);
        printf("send: %d, erron: %d, %s \n", len, errno, strerror(errno));
        sleep(1);
    }

}

int main(){
    test_full_sock_buf_1();

    return 0;
}

Code in server side:

    #include <arpa/inet.h>
    #include <sys/socket.h>
    #include <stdio.h>
    #include <errno.h>
    #include <fcntl.h>
    #include <stdlib.h>
    #include <string.h>
    #define exit_if(r, ...)                                                                          \
        if (r) {                                                                                     \
            printf(__VA_ARGS__);                                                                     \
            printf("%s:%d error no: %d error msg %s\n", __FILE__, __LINE__, errno, strerror(errno)); \
            exit(1);                                                                                 \
        }
void test_full_sock_buf_1(){

    int listenfd = socket(AF_INET, SOCK_STREAM, 0);
    exit_if(listenfd<0, "create socket error");

    short port = 8000;
    struct sockaddr_in addr;
    memset(&addr, 0, sizeof addr);
    addr.sin_family = AF_INET;
    addr.sin_port = htons(port);
    addr.sin_addr.s_addr = INADDR_ANY;

    int r = ::bind(listenfd, (struct sockaddr *) &addr, sizeof(struct sockaddr));
    exit_if(r<0, "bind socket error");

    r = listen(listenfd, 100);
    exit_if(r<0, "listen socket error");

    struct sockaddr_in raddr;
    socklen_t rsz = sizeof(raddr);
    int cfd = accept(listenfd, (struct sockaddr *) &raddr, &rsz);
    exit_if(cfd<0, "accept socket error");

    sockaddr_in peer;
    socklen_t alen = sizeof(peer);
    getpeername(cfd, (sockaddr *) &peer, &alen);

    printf("accept a connection from %s:%d\n", inet_ntoa(peer.sin_addr), ntohs(peer.sin_port));

    printf("but now I will sleep 15 second, then exit");
    sleep(15);
}

Start server side, then start client side.

server side may output:

accept a connection from 127.0.0.1:35764
but now I will sleep 15 second, then exit
Process finished with exit code 0

client side may output:

connect to server successsend: 1024000, erron: 0, Success 
send: 1024000, erron: 0, Success 
send: 1024000, erron: 0, Success 
send: 552190, erron: 0, Success 
send: -1, erron: 11, Resource temporarily unavailable 
send: -1, erron: 11, Resource temporarily unavailable 
send: -1, erron: 11, Resource temporarily unavailable 
send: -1, erron: 11, Resource temporarily unavailable 
send: -1, erron: 11, Resource temporarily unavailable 
send: -1, erron: 11, Resource temporarily unavailable 
send: -1, erron: 11, Resource temporarily unavailable 
send: -1, erron: 11, Resource temporarily unavailable 
send: -1, erron: 11, Resource temporarily unavailable 
send: -1, erron: 11, Resource temporarily unavailable 
send: -1, erron: 11, Resource temporarily unavailable 
send: -1, erron: 104, Connection reset by peer 
send: -1, erron: 32, Broken pipe 
send: -1, erron: 32, Broken pipe 
send: -1, erron: 32, Broken pipe 
send: -1, erron: 32, Broken pipe 
send: -1, erron: 32, Broken pipe

You can see, as the server side doesn't recv the data from client, so when the client side tcp buffer get full, but you still send data, so you may get Resource temporarily unavailable error.

Writing Unicode text to a text file?

In Python 2.6+, you could use io.open() that is default (builtin open()) on Python 3:

import io

with io.open(filename, 'w', encoding=character_encoding) as file:
    file.write(unicode_text)

It might be more convenient if you need to write the text incrementally (you don't need to call unicode_text.encode(character_encoding) multiple times). Unlike codecs module, io module has a proper universal newlines support.

"Permission Denied" trying to run Python on Windows 10

Workaround: If you have installed python from exe follow below steps.

Step 1: Uninstall python

Step 2: Install python and check Python path check box as highlighted in below screentshot(yellow).

This solved me the problem.

SqlDataAdapter vs SqlDataReader

The Fill function uses a DataReader internally. If your consideration is "Which one is more efficient?", then using a DataReader in a tight loop that populates a collection record-by-record, is likely to be the same load on the system as using DataAdapter.Fill.

(System.Data.dll, System.Data.Common.DbDataAdapter, FillInternal.)

How to SFTP with PHP?

I performed a full-on cop-out and wrote a class which creates a batch file and then calls sftp via a system call. Not the nicest (or fastest) way of doing it but it works for what I need and it didn't require any installation of extra libraries or extensions in PHP.

Could be the way to go if you don't want to use the ssh2 extensions

how to run command "mysqladmin flush-hosts" on Amazon RDS database Server instance?

You can flush hosts local MySQL using following command:

mysqladmin -u [username] -p flush-hosts
**** [MySQL password]

mysqladmin flush-hosts -u [username] -p
**** [MySQL password]

Though Amazon RDS database server is on network then use the following command as like as flush network MySQL server:

mysqladmin -h <RDS ENDPOINT URL> -P <PORT> -u <USER> -p flush-hosts
mysqladmin -h [YOUR RDS END POINT URL] -P 3306 -u [DB USER] -p flush-hosts

In additional suggestion you can permanently solve blocked of many connections error problem by editing my.ini file[Mysql configuration file]

change variables max_connections = 10000;

mysql -u [username] -p
**** [MySQL password]

put the below command into MySQL window

SET GLOBAL max_connect_errors=10000;
set global max_connections = 200;

check veritable using command-

show variables like "max_connections";
show variables like "max_connect_errors";

What is the default access specifier in Java?

the default access specifier is package.Classes can access the members of other classes in the same package.but outside the package it appears as private

How to list only the file names that changed between two commits?

Also note, if you just want to see the changed files between the last commit and the one before it. This works fine: git show --name-only

html table span entire width?

Just FYI:

html should be table & width:100%. span should be margin: auto;

Setting the MySQL root user password on OS X

This is what exactly worked for me:

Make sure no other MySQL process is running.To check this do the following:

 a.From the terminal, run this command:
       lsof -i:3306 
   If any PID is returned, kill it using kill -9 PID
 b. Go To System Preferences > MySQL > check if any MySQL instances 
    are running, stop them.

Start MySQL with the command:

sudo /usr/local/mysql/bin/mysqld_safe --skip-grant-tables

The password for every user is stored in the mysql.user table under columns User and authentication_string respectively. We can update the table as:
```
UPDATE mysql.user SET authentication_string='your_password' where User='root'
```

How to check if a character is upper-case in Python?

Use list(str) to break into chars then import string and use string.ascii_uppercase to compare against.

Check the string module: http://docs.python.org/library/string.html

PreparedStatement with Statement.RETURN_GENERATED_KEYS

Not having a compiler by me right now, I'll answer by asking a question:

Have you tried this? Does it work?

long key = -1L;
PreparedStatement statement = connection.prepareStatement();
statement.executeUpdate(YOUR_SQL_HERE, PreparedStatement.RETURN_GENERATED_KEYS);
ResultSet rs = statement.getGeneratedKeys();
if (rs != null && rs.next()) {
    key = rs.getLong(1);
}

Disclaimer: Obviously, I haven't compiled this, but you get the idea.

PreparedStatement is a subinterface of Statement, so I don't see a reason why this wouldn't work, unless some JDBC drivers are buggy.

How do I set specific environment variables when debugging in Visual Studio?

Starting with NUnit 2.5 you can use /framework switch e.g.:

nunit-console myassembly.dll /framework:net-1.1

This is from NUnit's help pages.

How to check if android checkbox is checked within its onClick method (declared in XML)?

<CheckBox
      android:id="@+id/checkBox1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Fees Paid Rs100:"
      android:textColor="#276ca4"
      android:checked="false"
      android:onClick="checkbox_clicked" />

Main Activity from here

   public class RegistA extends Activity {
CheckBox fee_checkbox;
 @Override
    protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_regist);
 fee_checkbox = (CheckBox)findViewById(R.id.checkBox1);// Fee Payment Check box
}

checkbox clicked

     public void checkbox_clicked(View v)
     {

         if(fee_checkbox.isChecked())
         {
            // true,do the task 

         }
         else
         {

         }

     }

Can't connect to Postgresql on port 5432

I had this same issue. I originally installed version 10 because that was the default install with Ubuntu 18.04. I later upgraded to 13.2 because I wanted the latest version. I made all the config modifications, but it was still just binging to 1207.0.0.1 and then I thought - maybe it is looking at the config files for version 10. I modified those and restarted the postgres service. Bingo! It was binding to 0.0.0.0

I will need to completely remove 10 and ensure that I am forcing the service to run under version 13.2, so if you upgraded from another version, try updating the other config files in that older directory.

Java 8 Lambda function that throws exception?

By default, Java 8 Function does not allow to throw exception and as suggested in multiple answers there are many ways to achieve it, one way is:

@FunctionalInterface
public interface FunctionWithException<T, R, E extends Exception> {
    R apply(T t) throws E;
}

Define as:

private FunctionWithException<String, Integer, IOException> myMethod = (str) -> {
    if ("abc".equals(str)) {
        throw new IOException();
    }
  return 1;
};

And add throws or try/catch the same exception in caller method.

Reverting to a specific commit based on commit id with Git?

Do you want to roll back your repo to that state, or you just want your local repo to look like that?

If you reset --hard, it will make your local code and local history be just like it was at that commit. But if you wanted to push this to someone else who has the new history, it would fail:

git reset --hard c14809fa

And if you reset --soft, it will move your HEAD to where they were , but leave your local files etc. the same:

git reset --soft c14809fa

So what exactly do you want to do with this reset?

Edit -

You can add "tags" to your repo.. and then go back to a tag. But a tag is really just a shortcut to the sha1.

You can tag this as TAG1.. then a git reset --soft c14809fa, git reset --soft TAG1, or git reset --soft c14809fafb08b9e96ff2879999ba8c807d10fb07 would all do the same thing.

How do I format date value as yyyy-mm-dd using SSIS expression builder?

Looks like you created a separate question. I was answering your other question How to change flat file source using foreach loop container in an SSIS package? with the same answer. Anyway, here it is again.

Create two string data type variables namely DirPath and FilePath. Set the value C:\backup\ to the variable DirPath. Do not set any value to the variable FilePath.

Variables

Select the variable FilePath and select F4 to view the properties. Set the EvaluateAsExpression property to True and set the Expression property as @[User::DirPath] + "Source" + (DT_STR, 4, 1252) DATEPART("yy" , GETDATE()) + "-" + RIGHT("0" + (DT_STR, 2, 1252) DATEPART("mm" , GETDATE()), 2) + "-" + RIGHT("0" + (DT_STR, 2, 1252) DATEPART("dd" , GETDATE()), 2)

Expression

sorting a vector of structs

As others have mentioned, you could use a comparison function, but you can also overload the < operator and the default less<T> functor will work as well:

struct data {
    string word;
    int number;
    bool operator < (const data& rhs) const {
        return word.size() < rhs.word.size();
    }
};

Then it's just:

std::sort(info.begin(), info.end());

Edit

As James McNellis pointed out, sort does not actually use the less<T> functor by default. However, the rest of the statement that the less<T> functor will work as well is still correct, which means that if you wanted to put struct datas into a std::map or std::set this would still work, but the other answers which provide a comparison function would need additional code to work with either.

Beautiful way to remove GET-variables with PHP?

You can use the server variables for this, for example $_SERVER['REQUEST_URI'], or even better: $_SERVER['PHP_SELF'].

How to empty a char array?

You cannot empty an array as such, it always contains the same amount of data.

In a bigger context the data in the array may represent an empty list of items, but that has to be defined in addition to the array. The most common ways to do this is to keep a count of valid items (see the answer by pmg) or for strings to terminate them with a zero character (the answer by Felix). There are also more complicated ways, for example a ring buffer uses two indices for the positions where data is added and removed.

Checking if a collection is empty in Java: which is the best method?

if (CollectionUtils.isNotEmpty(listName))

Is the same as:

if(listName != null && !listName.isEmpty())

In first approach listName can be null and null pointer exception will not be thrown. In second approach you have to check for null manually. First approach is better because it requires less work from you. Using .size() != 0 is something unnecessary at all, also i learned that it is slower than using .isEmpty()

Best way to read a large file into a byte array in C#?

Use the BufferedStream class in C# to improve performance. A buffer is a block of bytes in memory used to cache data, thereby reducing the number of calls to the operating system. Buffers improve read and write performance.

See the following for a code example and additional explanation: http://msdn.microsoft.com/en-us/library/system.io.bufferedstream.aspx

how to call url of any other website in php

Depending on what you mean, either redirect or use curl.

How to fix "unable to open stdio.h in Turbo C" error?

First check whether the folder name is right or wrong since while you copying to one folder from other accidently it takes other folder address eg it take C instead of F So from OPTION>DIRECTORY change the folder name

How to make custom dialog with rounded corners in android

dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));

this works for me

PHP - check if variable is undefined

JavaScript's 'strict not equal' operator (!==) on comparison with undefined does not result in false on null values.

var createTouch = null;
isTouch = createTouch !== undefined  // true

To achieve an equivalent behaviour in PHP, you can check whether the variable name exists in the keys of the result of get_defined_vars().

// just to simplify output format
const BR = '<br>' . PHP_EOL;

// set a global variable to test independence in local scope
$test = 1;

// test in local scope (what is working in global scope as well)
function test()
{
  // is global variable found?
  echo '$test ' . ( array_key_exists('test', get_defined_vars())
                    ? 'exists.' : 'does not exist.' ) . BR;
  // $test does not exist.

  // is local variable found?
  $test = null;
  echo '$test ' . ( array_key_exists('test', get_defined_vars())
                    ? 'exists.' : 'does not exist.' ) . BR;
  // $test exists.

  // try same non-null variable value as globally defined as well
  $test = 1;
  echo '$test ' . ( array_key_exists('test', get_defined_vars())
                    ? 'exists.' : 'does not exist.' ) . BR;
  // $test exists.

  // repeat test after variable is unset
  unset($test);
  echo '$test ' . ( array_key_exists('test', get_defined_vars())
                    ? 'exists.' : 'does not exist.') . BR;
  // $test does not exist.
}

test();

In most cases, isset($variable) is appropriate. That is aquivalent to array_key_exists('variable', get_defined_vars()) && null !== $variable. If you just use null !== $variable without prechecking for existence, you will mess up your logs with warnings because that is an attempt to read the value of an undefined variable.

However, you can apply an undefined variable to a reference without any warning:

// write our own isset() function
function my_isset(&$var)
{
  // here $var is defined
  // and initialized to null if the given argument was not defined
  return null === $var;
}

// passing an undefined variable by reference does not log any warning
$is_set = my_isset($undefined_variable);   // $is_set is false

Passing command line arguments in Visual Studio 2010?

Visual Studio e.g. 2019 In general be aware that the selected Platform (e.g. x64) in the configuration Dialog is the the same as the Platform You intend to debug with! (see picture for explanation)

Greetings mic enter image description here

MongoDB query multiple collections at once

Here is answer for your question.

db.getCollection('users').aggregate([
    {$match : {admin : 1}},
    {$lookup: {from: "posts",localField: "_id",foreignField: "owner_id",as: "posts"}},
    {$project : {
            posts : { $filter : {input : "$posts"  , as : "post", cond : { $eq : ['$$post.via' , 'facebook'] } } },
            admin : 1

        }}

])

Or either you can go with mongodb group option.

db.getCollection('users').aggregate([
    {$match : {admin : 1}},
    {$lookup: {from: "posts",localField: "_id",foreignField: "owner_id",as: "posts"}},
    {$unwind : "$posts"},
    {$match : {"posts.via":"facebook"}},
    { $group : {
            _id : "$_id",
            posts : {$push : "$posts"}
    }}
])

Change values on matplotlib imshow() graph axis

I had a similar problem and google was sending me to this post. My solution was a bit different and less compact, but hopefully this can be useful to someone.

Showing your image with matplotlib.pyplot.imshow is generally a fast way to display 2D data. However this by default labels the axes with the pixel count. If the 2D data you are plotting corresponds to some uniform grid defined by arrays x and y, then you can use matplotlib.pyplot.xticks and matplotlib.pyplot.yticks to label the x and y axes using the values in those arrays. These will associate some labels, corresponding to the actual grid data, to the pixel counts on the axes. And doing this is much faster than using something like pcolor for example.

Here is an attempt at this with your data:

import matplotlib.pyplot as plt

# ... define 2D array hist as you did

plt.imshow(hist, cmap='Reds')
x = np.arange(80,122,2) # the grid to which your data corresponds
nx = x.shape[0]
no_labels = 7 # how many labels to see on axis x
step_x = int(nx / (no_labels - 1)) # step between consecutive labels
x_positions = np.arange(0,nx,step_x) # pixel count at label position
x_labels = x[::step_x] # labels you want to see
plt.xticks(x_positions, x_labels)
# in principle you can do the same for y, but it is not necessary in your case

'LIKE ('%this%' OR '%that%') and something=else' not working

Try something like:

WHERE (column LIKE '%this%' OR column LIKE '%that%') AND something = else

How to save username and password in Git?

If you are using the Git Credential Manager on Windows...

git config -l should show:

credential.helper=manager

However, if you are not getting prompted for a credential then follow these steps:

Open Control Panel from the Start menu
Select User Accounts
Select Manage your credentials in the left hand menu
Delete any credentials related to Git or GitHub

Also ensure you have not set HTTP_PROXY, HTTPS_PROXY, NO_PROXY environmental variables if you have proxy and your Git server is on the internal network.

You can also test Git fetch/push/pull using git-gui which links to credential manager binaries in C:\Users\<username>\AppData\Local\Programs\Git\mingw64\libexec\git-core

How to remove unused imports from Eclipse

Remove all unused import in eclipse:

Right click on the desired package then Source->Organize Imports. Or You can direct use the shortcut by pressing Ctrl+Shift+O

Work perfectly.

How to set initial size of std::vector?

std::vector<CustomClass *> whatever(20000);

or:

std::vector<CustomClass *> whatever;
whatever.reserve(20000);

The former sets the actual size of the array -- i.e., makes it a vector of 20000 pointers. The latter leaves the vector empty, but reserves space for 20000 pointers, so you can insert (up to) that many without it having to reallocate.

At least in my experience, it's fairly unusual for either of these to make a huge difference in performance--but either can affect correctness under some circumstances. In particular, as long as no reallocation takes place, iterators into the vector are guaranteed to remain valid, and once you've set the size/reserved space, you're guaranteed there won't be any reallocations as long as you don't increase the size beyond that.

An explicit value for the identity column in table can only be specified when a column list is used and IDENTITY_INSERT is ON SQL Server

I think this error occurs due to the mismatch with number of columns in table definition and number of columns in the insert query. Also the length of the column is omitted with the entered value. So just review the table definition to resolve this issue

Two Radio Buttons ASP.NET C#

In order to make it work, you have to set property GroupName of both radio buttons to the same value:

<asp:RadioButton id="rbMetric" runat="server" GroupName="measurementSystem"></asp:RadioButton>
<asp:RadioButton id="rbUS" runat="server" GroupName="measurementSystem"></asp:RadioButton>

Personally, I prefer to use a RadioButtonList:

<asp:RadioButtonList ID="rblMeasurementSystem" runat="server">
    <asp:ListItem Text="Metric" Value="metric" />
    <asp:ListItem Text="US" Value="us" />
</asp:RadioButtonList>

How do I conditionally add attributes to React components?

From my point of view the best way to manage multiple conditional props is the props object approach from @brigand. But it can be improved in order to avoid adding one if block for each conditional prop.

The ifVal helper

rename it as you like (iv, condVal, cv, _, ...)

You can define a helper function to return a value, or another, if a condition is met:

// components-helpers.js
export const ifVal = (cond, trueValue=true, falseValue=null) => {
  return cond ? trueValue : falseValue
}

If cond is true (or truthy), the trueValue is returned - or true. If cond is false (or falsy), the falseValue is returned - or null.

These defaults (true and null) are, usually the right values to allow a prop to be passed or not to a React component. You can think to this function as an "improved React ternary operator". Please improve it if you need more control over the returned values.

Let's use it with many props.

Build the (complex) props object

// your-code.js
import { ifVal } from './components-helpers.js'

// BE SURE to replace all true/false with a real condition in you code
// this is just an example

const inputProps = {
  value: 'foo',
  enabled: ifVal(true), // true
  noProp: ifVal(false), // null - ignored by React
  aProp: ifVal(true, 'my value'), // 'my value'
  bProp: ifVal(false, 'the true text', 'the false text') // 'my false value',
  onAction: ifVal(isGuest, handleGuest, handleUser) // it depends on isGuest value
};

 <MyComponent {...inputProps} />

This approach is something similar to the popular way to conditionally manage classes using the classnames utility, but adapted to props.

Why you should use this approach

You'll have a clean and readable syntax, even with many conditional props: every new prop just add a line of code inside the object declaration.

In this way you replace the syntax noise of repeated operators (..., &&, ? :, ...), that can be very annoying when you have many props, with a plain function call.

Our top priority, as developers, is to write the most obvious code that solve a problem. Too many times we solve problems for our ego, adding complexity where it's not required. Our code should be straightforward, for us today, for us tomorrow and for our mates.

just because we can do something doesn't mean we should

I hope this late reply will help.

How do I rename the android package name?

You can do this:

Change the package name manually in the manifest file.
Click on your R.java class and the press F6 (Refactor->Move...). It will allow you to move the class to another package, and all references to that class will be updated.

Creating a recursive method for Palindrome

public class PlaindromeNumbers {

int func1(int n)
{
    if(n==1)
        return 1;

    return n*func1(n-1);
}

static boolean check=false;
int func(int no)
{

    String a=""+no;

    String reverse = new StringBuffer(a).reverse().toString();

    if(a.equals(reverse))
    {

        if(!a.contains("0"))
        {
           System.out.println("hey");
            check=true;
            return Integer.parseInt(a);
        }

    }

      //  else
      //  {
    func(no++);
    if(check==true)
    {
        return 0;
    }
       return 0;   
   }
public static void main(String[] args) {
    // TODO code application logic here
    Scanner in=new Scanner(System.in);
    System.out.println("Enter testcase");
   int testcase=in.nextInt(); 
   while(testcase>0)
   {
     int a=in.nextInt();
     PlaindromeNumbers obj=new PlaindromeNumbers();
       System.out.println(obj.func(a));
       testcase--;
   }
}

}

Converting from Integer, to BigInteger

The method you want is BigInteger#valueOf(long val).

E.g.,

BigInteger bi = BigInteger.valueOf(myInteger.intValue());

Making a String first is unnecessary and undesired.

Setting device orientation in Swift iOS

Swift 4:

The simplest answer, in my case needing to ensure one onboarding tutorial view was portrait-only:

extension myViewController {
    //manage rotation for this viewcontroller
    override open var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        return .portrait
    }
}

Eezy-peezy.

How to remove word wrap from textarea?

If you can use JavaScript, the following might be the most portable option today (tested Firefox 31, Chrome 36):

a div with contenteditable="true"
the styles suggested by Partly
JavaScript form submission on button click: How to submit a form using javascript?

http://jsfiddle.net/cirosantilli/eaxgesoq/

<style>
  div#editor {
    white-space: pre;
    word-wrap: normal;
    overflow-x: scroll;
  }
<style>
<div contenteditable="true"></div>

There seems to be no standard, portable CSS solution:

wrap attribute is not standard
white-space: pre; does not work for Firefox 31 for textarea. Fiddle, open feature request.

Also, if you can use Javascript, you might as well use the ACE editor:

http://jsfiddle.net/cirosantilli/bL9vr8o8/

<script src="http://cdnjs.cloudflare.com/ajax/libs/ace/1.1.3/ace.js"></script>
<div id="editor">content</div>
<script>
  var editor = ace.edit('editor')
  editor.renderer.setShowGutter(false)
</script>

Probably works with ACE because it does not use a textarea either which is underspecified / incoherently implemented, but not sure if it is uses contenteditable.

iOS start Background Thread

Swift 2.x answer:

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {
        self.getResultSetFromDB(docids)
    }

Reverse HashMap keys and values in Java

Apache commons collections library provides a utility method for inversing the map. You can use this if you are sure that the values of myHashMap are unique

org.apache.commons.collections.MapUtils.invertMap(java.util.Map map)

Sample code

HashMap<String, Character> reversedHashMap = MapUtils.invertMap(myHashMap)

OSError: [Errno 2] No such file or directory while using python subprocess in Django

Can't upvote so I'll repost @jfs comment cause I think it should be more visible.

@AnneTheAgile: shell=True is not required. Moreover you should not use it unless it is necessary (see @ valid's comment). You should pass each command-line argument as a separate list item instead e.g., use ['command', 'arg 1', 'arg 2'] instead of "command 'arg 1' 'arg 2'". – jfs Mar 3 '15 at 10:02

Get top most UIViewController

Based on Dianz answer, the Objective-C version

- (UIViewController *) topViewController {
   UIViewController *baseVC = UIApplication.sharedApplication.keyWindow.rootViewController;
   if ([baseVC isKindOfClass:[UINavigationController class]]) {
       return ((UINavigationController *)baseVC).visibleViewController;
   }

   if ([baseVC isKindOfClass:[UITabBarController class]]) {
       UIViewController *selectedTVC = ((UITabBarController*)baseVC).selectedViewController;
       if (selectedTVC) {
           return selectedTVC;
       }
   }

   if (baseVC.presentedViewController) {
       return baseVC.presentedViewController;
   }
   return baseVC;
}

AngularJS: how to enable $locationProvider.html5Mode with deeplinking

Found out that there's no bug there. Just add:

<base href="/" />

to your <head />.

How do you decrease navbar height in Bootstrap 3?

Minder Saini's example above almost works, but the .navbar-brand needs to be reduced as well.

A working example (using it on my own site) with Bootstrap 3.3.4:

.navbar-nav > li > a, .navbar-brand {
    padding-top:5px !important; padding-bottom:0 !important;
    height: 30px;
}
.navbar {min-height:30px !important;}

Edit for Mobile... To make this example work on mobile as well, you have to change the styling of the navbar toggle like so

.navbar-toggle {
     padding: 0 0;
     margin-top: 7px;
     margin-bottom: 0;
}

Bash script to calculate time elapsed

Either $(()) or $[] will work for computing the result of an arithmetic operation. You're using $() which is simply taking the string and evaluating it as a command. It's a bit of a subtle distinction. Hope this helps.

As tink pointed out in the comments on this answer, $[] is deprecated, and $(()) should be favored.

Is there any way to prevent input type="number" getting negative values?

_x000D_

If Number is Negative or Positive Using ES6’s Math.Sign_x000D_
_x000D_
const num = -8;_x000D_
// Old Way_x000D_
num === 0 ? num : (num > 0 ? 1 : -1); // -1_x000D_
_x000D_
// ES6 Way_x000D_
Math.sign(num); // -1

_x000D_

What does "publicPath" in Webpack do?

publicPath is used by webpack for the replacing relative path defined in your css for refering image and font file.

Simple regular expression for a decimal with a precision of 2

Try this

 (\\+|-)?([0-9]+(\\.[0-9]+))

It will allow positive and negative signs also.

How to obtain the query string from the current URL with JavaScript?

I think it is way more safer to rely on the browser than any ingenious regex:

_x000D_

const parseUrl = function(url) { _x000D_
  const a = document.createElement('a')_x000D_
  a.href = url_x000D_
  return {_x000D_
    protocol: a.protocol ? a.protocol : null,_x000D_
    hostname: a.hostname ? a.hostname : null,_x000D_
    port: a.port ? a.port : null,_x000D_
    path: a.pathname ? a.pathname : null,_x000D_
    query: a.search ? a.search : null,_x000D_
    hash: a.hash ? a.hash : null,_x000D_
    host: a.host ? a.host : null  _x000D_
  }_x000D_
}_x000D_
_x000D_
console.log( parseUrl(window.location.href) ) //stacksnippet_x000D_
//to obtain a query_x000D_
console.log( parseUrl( 'https://example.com?qwery=this').query )

_x000D_

AndroidStudio SDK directory does not exists

I faced the same problem - it was solved by only the following step. I deleted all created .idea and .gradle folders. It is the path problem I faced while loading source in SDK, I think.

Does dispatch_async(dispatch_get_main_queue(), ^{...}); wait until done?

If you want to run a single independent queued operation and you’re not concerned with other concurrent operations, you can use the global concurrent queue:

dispatch_queue_t globalConcurrentQueue =
dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)

This will return a concurrent queue with the given priority as outlined in the documentation:

DISPATCH_QUEUE_PRIORITY_HIGH Items dispatched to the queue will run at high priority, i.e. the queue will be scheduled for execution before any default priority or low priority queue.

DISPATCH_QUEUE_PRIORITY_DEFAULT Items dispatched to the queue will run at the default priority, i.e. the queue will be scheduled for execution after all high priority queues have been scheduled, but before any low priority queues have been scheduled.

DISPATCH_QUEUE_PRIORITY_LOW Items dispatched to the queue will run at low priority, i.e. the queue will be scheduled for execution after all default priority and high priority queues have been scheduled.

DISPATCH_QUEUE_PRIORITY_BACKGROUND Items dispatched to the queue will run at background priority, i.e. the queue will be scheduled for execution after all higher priority queues have been scheduled and the system will run items on this queue on a thread with background status as per setpriority(2) (i.e. disk I/O is throttled and the thread’s scheduling priority is set to lowest value).

How to query as GROUP BY in django?

You need to do custom SQL as exemplified in this snippet:

Custom SQL via subquery

Or in a custom manager as shown in the online Django docs:

Adding extra Manager methods

Formatting a number as currency using CSS

How to use SQL LIKE condition with multiple values in PostgreSQL?

Use LIKE ANY(ARRAY['AAA%', 'BBB%', 'CCC%']) as per this cool trick @maniek showed earlier today.

How to embed a PDF viewer in a page?

If I'm not mistaken, the OP was asking (although later accepted a .js solution) whether Google's embedded PDF display server will display a PDF on his own website.

So, one and a half years later: yes, it will.

See http://googlesystem.blogspot.ca/2009/09/embeddable-google-document-viewer.html. Also, see https://docs.google.com/viewer, and plug in the URL of the file you want to display.

Edit: Re-reading, OP was asking for solutions that don't use iFrames. I don't think that's possible with Google's viewer.

Appending a list to a list of lists in R

By putting an assignment of list on a variable first

myVar <- list()

it opens the possibility of hiearchial assignments by

myVar[[1]] <- list()
myVar[[2]] <- list()

and so on... so now it's possible to do

myVar[[1]][[1]] <- c(...)
myVar[[1]][[2]] <- c(...)

or

myVar[[1]][['subVar']] <- c(...)

and so on

it is also possible to assign directly names (instead of $)

myVar[['nameofsubvar]] <- list()

and then

myVar[['nameofsubvar]][['nameofsubsubvar']] <- c('...')

important to remember is to always use double brackets to make the system work

then to get information is simple

myVar$nameofsubvar$nameofsubsubvar

and so on...

example:

a <-list()
a[['test']] <-list()
a[['test']][['subtest']] <- c(1,2,3)
a
$test
$test$subtest
[1] 1 2 3


a[['test']][['sub2test']] <- c(3,4,5)
a
$test
$test$subtest
[1] 1 2 3

$test$sub2test
[1] 3 4 5

a nice feature of the R language in it's hiearchial definition...

I used it for a complex implementation (with more than two levels) and it works!

Docker official registry (Docker Hub) URL

For those trying to create a Google Cloud instance using the "Deploy a container image to this VM instance." option then the correct url format would be

docker.io/<dockerimagename>:version

The suggestion above of registry.hub.docker.com/library/<dockerimagename> did not work for me.

I finally found the solution here (in my case, i was trying to run docker.io/tensorflow/serving:latest)

Python basics printing 1 to 100

Because the condition is never true. i.e. count !=100 never executes when you put count=count+3 or count =count+9. try this out..while count<100

How to send an HTTP request using Telnet

For posterity, your question was how to send an http request to https://stackoverflow.com/questions. The real answer is: you cannot with telnet, cause this is an https-only reachable url.

So, you might want to use openssl instead of telnet, like this for instance

$ openssl s_client -connect stackoverflow.com:443
...
---
GET /questions HTTP/1.1
Host: stackoverflow.com

This will give you the https response.

c++ and opencv get and set pixel color to Mat

You did everything except copying the new pixel value back to the image.

This line takes a copy of the pixel into a local variable:

Vec3b color = image.at<Vec3b>(Point(x,y));

So, after changing color as you require, just set it back like this:

image.at<Vec3b>(Point(x,y)) = color;

So, in full, something like this:

Mat image = img;
for(int y=0;y<img.rows;y++)
{
    for(int x=0;x<img.cols;x++)
    {
        // get pixel
        Vec3b & color = image.at<Vec3b>(y,x);

        // ... do something to the color ....
        color[0] = 13;
        color[1] = 13;
        color[2] = 13;

        // set pixel
        //image.at<Vec3b>(Point(x,y)) = color;
        //if you copy value
    }
}

Anaconda vs. miniconda

The 2 in Anaconda2 means that the main version of Python will be 2.x rather than the 3.x installed in Anaconda3. The current release has Python 2.7.13.

The 4.4.0.1 is the version number of Anaconda. The current advertised version is 4.4.0 and I assume the .1 is a minor release or for other similar use. The Windows releases, which I use, just say 4.4.0 in the file name.

Others have now explained the difference between Anaconda and Miniconda, so I'll skip that.

Run a php app using tomcat?

Make sure you have php installed on your server
Find the latest release of php-java-bridge off of sourceforge
From the exploded directory on Sourceforge, download php-servlet.jar and JavaBridge.jar
Place those jar files into webapp/WEB-INF/lib folder of your project
Edit webapp/WEB-INF/web.xml to look like:

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
   <filter>
      <filter-name>PhpCGIFilter</filter-name>
      <filter-class>php.java.servlet.PhpCGIFilter</filter-class>
   </filter>
   <filter-mapping>
      <filter-name>PhpCGIFilter</filter-name>
      <url-pattern>/*</url-pattern>
   </filter-mapping>
   <!-- the following adds the JSR223 listener. Remove it if you don't want to use the JSR223 API -->
   <listener>
      <listener-class>php.java.servlet.ContextLoaderListener</listener-class>
   </listener>
   <!-- the back end for external (console, Apache/IIS-) PHP scripts; remove it if you don't need this -->
   <servlet>
      <servlet-name>PhpJavaServlet</servlet-name>
      <servlet-class>php.java.servlet.PhpJavaServlet</servlet-class>
   </servlet>
   <!-- runs PHP scripts in this web app; remove it if you don't need this -->
   <servlet>
      <servlet-name>PhpCGIServlet</servlet-name>
      <servlet-class>php.java.servlet.fastcgi.FastCGIServlet</servlet-class>
      <load-on-startup>0</load-on-startup>
   </servlet>
   <servlet-mapping>
      <servlet-name>PhpJavaServlet</servlet-name>
      <url-pattern>*.phpjavabridge</url-pattern>
   </servlet-mapping>
   <servlet-mapping>
      <servlet-name>PhpCGIServlet</servlet-name>
      <url-pattern>*.php</url-pattern>
   </servlet-mapping>
</web-app>

You may have other content inside this file, just make sure you have added everything between the web-app tag.

Add your php files to the webapp directory

You can do other special things with this as well. You cal learn more about it here: http://php-java-bridge.sourceforge.net/pjb/how_it_works.php

Does JavaScript guarantee object property order?

Major Difference between Object and MAP with Example :

it's Order of iteration in loop, In Map it follows the order as it was set while creation whereas in OBJECT does not.

SEE: OBJECT

const obj = {};
obj.prop1 = "Foo";
obj.prop2 = "Bar";
obj['1'] = "day";
console.log(obj)

**OUTPUT: {1: "day", prop1: "Foo", prop2: "Bar"}**

MAP

    const myMap = new Map()
    // setting the values
    myMap.set("foo", "value associated with 'a string'")
    myMap.set("Bar", 'value associated with keyObj')
    myMap.set("1", 'value associated with keyFunc')

OUTPUT:
**1.    ?0: Array[2]
1.   0: "foo"
2.   1: "value associated with 'a string'"
2.  ?1: Array[2]
1.   0: "Bar"
2.   1: "value associated with keyObj"
3.  ?2: Array[2]
1.   0: "1"
2.   1: "value associated with keyFunc"**

how to get domain name from URL

import urlparse

GENERIC_TLDS = [
    'aero', 'asia', 'biz', 'com', 'coop', 'edu', 'gov', 'info', 'int', 'jobs', 
    'mil', 'mobi', 'museum', 'name', 'net', 'org', 'pro', 'tel', 'travel', 'cat'
    ]

def get_domain(url):
    hostname = urlparse.urlparse(url.lower()).netloc
    if hostname == '':
        # Force the recognition as a full URL
        hostname = urlparse.urlparse('http://' + uri).netloc

    # Remove the 'user:passw', 'www.' and ':port' parts
    hostname = hostname.split('@')[-1].split(':')[0].lstrip('www.').split('.')

    num_parts = len(hostname)
    if (num_parts < 3) or (len(hostname[-1]) > 2):
        return '.'.join(hostname[:-1])
    if len(hostname[-2]) > 2 and hostname[-2] not in GENERIC_TLDS:
        return '.'.join(hostname[:-1])
    if num_parts >= 3:
        return '.'.join(hostname[:-2])

This code isn't guaranteed to work with all URLs and doesn't filter those that are grammatically correct but invalid like 'example.uk'.

However it'll do the job in most cases.

CSS transition effect makes image blurry / moves image 1px, in Chrome?

I recommended an experimental new attribute CSS I tested on latest browser and it's good:

image-rendering: optimizeSpeed;             /*                     */
image-rendering: -moz-crisp-edges;          /* Firefox             */
image-rendering: -o-crisp-edges;            /* Opera               */
image-rendering: -webkit-optimize-contrast; /* Chrome (and Safari) */
image-rendering: optimize-contrast;         /* CSS3 Proposed       */
-ms-interpolation-mode: nearest-neighbor;   /* IE8+                */

With this the browser will know the algorithm for rendering

What does the @ symbol before a variable name mean in C#?

It allows you to use a C# keyword as a variable. For example:

class MyClass
{
   public string name { get; set; }
   public string @class { get; set; }
}

Django values_list vs values

The values() method returns a QuerySet containing dictionaries:

<QuerySet [{'comment_id': 1}, {'comment_id': 2}]>

The values_list() method returns a QuerySet containing tuples:

<QuerySet [(1,), (2,)]>

If you are using values_list() with a single field, you can use flat=True to return a QuerySet of single values instead of 1-tuples:

<QuerySet [1, 2]>

Editor does not contain a main type

One more thing to check: make sure that your source file contains the correct package declaration corresponding to the subdirectory it's in. The error mentioned by the OP can be seen when trying to run a "main type" declared in a file in a subdirectory but missing the package statement.

React Native: JAVA_HOME is not set and no 'java' command could be found in your PATH

It is located on the Android Studio folder itself, on where you installed it.

How to do associative array/hashing in JavaScript

In C# the code looks like:

Dictionary<string,int> dictionary = new Dictionary<string,int>();
dictionary.add("sample1", 1);
dictionary.add("sample2", 2);

var dictionary = new Dictionary<string, int> {
    {"sample1", 1},
    {"sample2", 2}
};

In JavaScript:

var dictionary = {
    "sample1": 1,
    "sample2": 2
}

A C# dictionary object contains useful methods, like dictionary.ContainsKey()

In JavaScript, we could use the hasOwnProperty like:

if (dictionary.hasOwnProperty("sample1"))
    console.log("sample1 key found and its value is"+ dictionary["sample1"]);

Run-time error '1004' - Method 'Range' of object'_Global' failed

Your range value is incorrect. You are referencing cell "75" which does not exist. You might want to use the R1C1 notation to use numeric columns easily without needing to convert to letters.

http://www.bettersolutions.com/excel/EED883/YI416010881.htm

Range("R" & DataImportRow & "C" & DataImportColumn).Offset(0, 2).Value = iFirstCustomerSales

This should fix your problem.

How to make lists contain only distinct element in Python?

From http://www.peterbe.com/plog/uniqifiers-benchmark:

def f5(seq, idfun=None):  
    # order preserving
    if idfun is None:
        def idfun(x): return x
    seen = {}
    result = []
    for item in seq:
        marker = idfun(item)
        # in old Python versions:
        # if seen.has_key(marker)
        # but in new ones:
        if marker in seen: continue
        seen[marker] = 1
        result.append(item)
    return result

how to run a winform from console application?

Here is the best method that I've found: First, set your projects output type to "Windows Application", then P/Invoke AllocConsole to create a console window.

internal static class NativeMethods
{
    [DllImport("kernel32.dll")]
    internal static extern Boolean AllocConsole();
}

static class Program
{

    static void Main(string[] args) {
        if (args.Length == 0) {
            // run as windows app
            Application.EnableVisualStyles();
            Application.Run(new Form1()); 
        } else {
            // run as console app
            NativeMethods.AllocConsole();
            Console.WriteLine("Hello World");
            Console.ReadLine();
        }
    }

}

Java 8: How do I work with exception throwing methods in streams?

How to check if a row exists in MySQL? (i.e. check if an email exists in MySQL)

The following are tried, tested and proven methods to check if a row exists.

(Some of which I use myself, or have used in the past).

Edit: I made an previous error in my syntax where I used mysqli_query() twice. Please consult the revision(s).

I.e.:

if (!mysqli_query($con,$query)) which should have simply read as if (!$query).

I apologize for overlooking that mistake.

Side note: Both '".$var."' and '$var' do the same thing. You can use either one, both are valid syntax.

Here are the two edited queries:

$query = mysqli_query($con, "SELECT * FROM emails WHERE email='".$email."'");

    if (!$query)
    {
        die('Error: ' . mysqli_error($con));
    }

if(mysqli_num_rows($query) > 0){

    echo "email already exists";

}else{

    // do something

}

and in your case:

$query = mysqli_query($dbl, "SELECT * FROM `tblUser` WHERE email='".$email."'");

    if (!$query)
    {
        die('Error: ' . mysqli_error($dbl));
    }

if(mysqli_num_rows($query) > 0){

    echo "email already exists";

}else{

    // do something

}

You can also use mysqli_ with a prepared statement method:

$query = "SELECT `email` FROM `tblUser` WHERE email=?";

if ($stmt = $dbl->prepare($query)){

        $stmt->bind_param("s", $email);

        if($stmt->execute()){
            $stmt->store_result();

            $email_check= "";         
            $stmt->bind_result($email_check);
            $stmt->fetch();

            if ($stmt->num_rows == 1){

            echo "That Email already exists.";
            exit;

            }
        }
    }

Or a PDO method with a prepared statement:

<?php
$email = $_POST['email'];

$mysql_hostname = 'xxx';
$mysql_username = 'xxx';
$mysql_password = 'xxx';
$mysql_dbname = 'xxx';

try {
$conn= new PDO("mysql:host=$mysql_hostname;dbname=$mysql_dbname", $mysql_username, $mysql_password); 
     $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch (PDOException $e) {
     exit( $e->getMessage() );
}

// assuming a named submit button
if(isset($_POST['submit']))
    {

        try {
            $stmt = $conn->prepare('SELECT `email` FROM `tblUser` WHERE email = ?');
            $stmt->bindParam(1, $_POST['email']); 
            $stmt->execute();
            while($row = $stmt->fetch(PDO::FETCH_ASSOC)) {

            }
        }
        catch(PDOException $e) {
            echo 'ERROR: ' . $e->getMessage();
        }

    if($stmt->rowCount() > 0){
        echo "The record exists!";
    } else {
        echo "The record is non-existant.";
    }


    }
?>

Prepared statements are best to be used to help protect against an SQL injection.

N.B.:

When dealing with forms and POST arrays as used/outlined above, make sure that the POST arrays contain values, that a POST method is used for the form and matching named attributes for the inputs.

FYI: Forms default to a GET method if not explicity instructed.

Note: <input type = "text" name = "var"> - $_POST['var'] match. $_POST['Var'] no match.

POST arrays are case-sensitive.

Consult:

http://php.net/manual/en/tutorial.forms.php

Error checking references:

Please note that MySQL APIs do not intermix, in case you may be visiting this Q&A and you're using mysql_ to connect with (and querying with).

You must use the same one from connecting to querying.

Consult the following about this:

Can I mix MySQL APIs in PHP?

If you are using the mysql_ API and have no choice to work with it, then consult the following Q&A on Stack:

MySql php: check if Row exists

The mysql_* functions are deprecated and will be removed from future PHP releases.

It's time to step into the 21st century.

You can also add a UNIQUE constraint to (a) row(s).

References:

How to see an HTML page on Github as a normal rendered HTML page to see preview in browser, without downloading?

Also, if you use Tampermonkey, you can add a script that will add preview with http://htmlpreview.github.com/ button into actions menu beside 'raw', 'blame' and 'history' buttons.

Script like this one: https://gist.github.com/vanyakosmos/83ba165b288af32cf85e2cac8f02ce6d

The equivalent of wrap_content and match_parent in flutter?

The short answer is that the parent doesn't have a size until the child has a size.

The way layout works in Flutter is that each widget provides constraints to each of its children, like "you can be up to this wide, you must be this tall, you have to be at least this wide", or whatever (specifically, they get a minimum width, a maximum width, a minimum height, and a maximum height). Each child takes those constraints, does something, and picks a size (width and height) that matches those constraints. Then, once each child has done its thing, the widget can can pick its own size.

Some widgets try to be as big as the parent allows. Some widgets try to be as small as the parent allows. Some widgets try to match a certain "natural" size (e.g. text, images).

Some widgets tell their children they can be any size they want. Some give their children the same constraints that they got from their parent.

How to see the proxy settings on windows?

You can use a tool called: NETSH

To view your system proxy information via command line:

netsh.exe winhttp show proxy

Another way to view it is to open IE, then click on the "gear" icon, then Internet options -> Connections tab -> click on LAN settings

PHP how to get the base domain/url?

Step-1

First trim the trailing backslash (/) from the URL. For example, If the URL is http://www.google.com/ then the resultant URL will be http://www.google.com

$url= trim($url, '/');

Step-2

If scheme not included in the URL, then prepend it. So for example if the URL is www.google.com then the resultant URL will be http://www.google.com

if (!preg_match('#^http(s)?://#', $url)) {
    $url = 'http://' . $url;
}

Step-3

Get the parts of the URL.

$urlParts = parse_url($url);

Step-4

Now remove www. from the URL

$domain = preg_replace('/^www\./', '', $urlParts['host']);

Your final domain without http and www is now stored in $domain variable.

Examples:

http://www.google.com => google.com

https://www.google.com => google.com

www.google.com => google.com

http://google.com => google.com

How to center a label text in WPF?

use the HorizontalContentAlignment property.

Sample

<Label HorizontalContentAlignment="Center"/>

Create a sample login page using servlet and JSP?

You're comparing the message with the empty string using ==.

First, your comparison is wrong because the message will be null (and not the empty string).

Second, it's wrong because Objects must be compared with equals() and not with ==.

Third, it's wrong because you should avoid scriptlets in JSP, and use the JSP EL, the JSTL, and other custom tags instead:

<c:id test="${!empty message}">
    <c:out value="${message}"/>
</c:if>

How can I convert a string with dot and comma into a float in Python

s =  "123,456.908"
print float(s.replace(',', ''))

The requested URL /about was not found on this server

The selected answer didn't solve this issue for me. So for those still scratching their head over this one, I found another solution!

In my Apache settings httpd.conf(you can find the conf file by running apachectl -V in your console), enabled the following module:

LoadModule rewrite_module modules/mod_rewrite.so

And now the site works as expected.

Select <a> which href ends with some string

Just in case you don't want to import a big library like jQuery to accomplish something this trivial, you can use the built-in method querySelectorAll instead. Almost all selector strings used for jQuery work with DOM methods as well:

const anchors = document.querySelectorAll('a[href$="ABC"]');

Or, if you know that there's only one matching element:

const anchor = document.querySelector('a[href$="ABC"]');

You may generally omit the quotes around the attribute value if the value you're searching for is alphanumeric, eg, here, you could also use

a[href$=ABC]

but quotes are more flexible and generally more reliable.

How to implement band-pass Butterworth filter with Scipy.signal.butter

The filter design method in accepted answer is correct, but it has a flaw. SciPy bandpass filters designed with b, a are unstable and may result in erroneous filters at higher filter orders.

Instead, use sos (second-order sections) output of filter design.

from scipy.signal import butter, sosfilt, sosfreqz

def butter_bandpass(lowcut, highcut, fs, order=5):
        nyq = 0.5 * fs
        low = lowcut / nyq
        high = highcut / nyq
        sos = butter(order, [low, high], analog=False, btype='band', output='sos')
        return sos

def butter_bandpass_filter(data, lowcut, highcut, fs, order=5):
        sos = butter_bandpass(lowcut, highcut, fs, order=order)
        y = sosfilt(sos, data)
        return y

Also, you can plot frequency response by changing

b, a = butter_bandpass(lowcut, highcut, fs, order=order)
w, h = freqz(b, a, worN=2000)

sos = butter_bandpass(lowcut, highcut, fs, order=order)
w, h = sosfreqz(sos, worN=2000)

Angular - Can't make ng-repeat orderBy work

Here's a version of @Julian Mosquera's code that also supports sorting by object key:

yourApp.filter('orderObjectBy', function () {
    return function (items, field, reverse) {
        // Build array
        var filtered = [];
        for (var key in items) {
            if (field === 'key')
                filtered.push(key);
            else
                filtered.push(items[key]);
        }
        // Sort array
        filtered.sort(function (a, b) {
            if (field === 'key')
                return (a > b ? 1 : -1);
            else
                return (a[field] > b[field] ? 1 : -1);
        });
        // Reverse array
        if (reverse)
            filtered.reverse();
        return filtered;
    };
});

What are Maven goals and phases and what is their difference?

The chosen answer is great, but still I would like to add something small to the topic. An illustration.

It clearly demonstrates how the different phases binded to different plugins and the goals that those plugins expose.

So, let's examine a case of running something like mvn compile:

It's a phase which execute the compiler plugin with compile goal
Compiler plugin got different goals. For mvn compile it's mapped to a specific goal, the compile goal.
It's the same as running mvn compiler:compile

Therefore, phase is made up of plugin goals.

Link to the reference

Sorting HTML table with JavaScript

_x000D_

<!DOCTYPE html>
<html>
<head>
<style>
  table, td, th {
    border: 1px solid;
    border-collapse: collapse;
  }
  td , th {
    padding: 5px;
    width: 100px;
  }
  th {
    background-color: lightgreen;
  }
</style>
</head>
<body>

<h2>JavaScript Array Sort</h2>

<p>Click the buttons to sort car objects on age.</p>

<p id="demo"></p>

<script>
var nameArrow = "", yearArrow = "";
var cars = [
  {type:"Volvo", year:2016},
  {type:"Saab", year:2001},
  {type:"BMW", year:2010}
];
yearACS = true;
function sortYear() {
  if (yearACS) {
    nameArrow = "";
    yearArrow = "";
    cars.sort(function(a,b) {
      return a.year - b.year;
    });
    yearACS = false;
  }else {
    nameArrow = "";
    yearArrow = "";
    cars.sort(function(a,b) {
      return b.year - a.year;
    });
    yearACS = true;
  }
  displayCars();
}
nameACS = true;
function sortName() {
  if (nameACS) {
    nameArrow = "";
    yearArrow = "";
    cars.sort(function(a,b) {
      x = a.type.toLowerCase();
      y = b.type.toLowerCase();
      if (x > y) {return 1;}
      if (x < y) {return -1};
      return 0;
    });
    nameACS = false;
  } else {
    nameArrow = "";
    yearArrow = "";
    cars.sort(function(a,b) {
      x = a.type.toUpperCase();
      y = b.type.toUpperCase();
      if (x > y) { return -1};
      if (x <y) { return 1 };
      return 0;
    });
    nameACS = true;
  }
  displayCars();
}

displayCars();

function displayCars() {
  var txt = "<table><tr><th onclick='sortName()'>name " + nameArrow + "</th><th onclick='sortYear()'>year " + yearArrow + "</th><tr>";
  for (let i = 0; i < cars.length; i++) {
    txt += "<tr><td>"+ cars[i].type + "</td><td>" + cars[i].year + "</td></tr>";
  }
  txt += "</table>";
  document.getElementById("demo").innerHTML = txt;
}

</script>

</body>
</html>

_x000D_

Authentication failed because remote party has closed the transport stream

I would advise against restricting the SecurityProtocol to TLS 1.1.

The recommended solution is to use

System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls

Another option is add the following Registry key:

Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319 
Value: SchUseStrongCrypto

It is worth noting that .NET 4.6 will use the correct protocol by default and does not require either solution.

pythonw.exe or python.exe?

See here: http://docs.python.org/using/windows.html

pythonw.exe "This suppresses the terminal window on startup."

What is the difference between pull and clone in git?

git clone is used for just downloading exactly what is currently working on the remote server repository and saving it in your machine's folder where that project is placed. Mostly it is used only when we are going to upload the project for the first time. After that pull is the better option.

git pull is basically a (clone(download) + merge) operation and mostly used when you are working as teamwork. In other words, when you want the recent changes in that project, you can pull.

How to parse dates in multiple formats using SimpleDateFormat

This solution checks all the possible formats before throwing an exception. This solution is more convenient if you are trying to test for multiple date formats.

Date extractTimestampInput(String strDate){
    final List<String> dateFormats = Arrays.asList("yyyy-MM-dd HH:mm:ss.SSS", "yyyy-MM-dd");    

    for(String format: dateFormats){
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        try{
            return sdf.parse(strDate);
        } catch (ParseException e) {
             //intentionally empty
        }
    }
        throw new IllegalArgumentException("Invalid input for date. Given '"+strDate+"', expecting format yyyy-MM-dd HH:mm:ss.SSS or yyyy-MM-dd.");

}

Extend a java class from one file in another java file

Just put the two files in the same directory. Here's an example:

Person.java

public class Person {
  public String name;

  public Person(String name) {
    this.name = name;
  }

  public String toString() {
    return name;
  }
}

Student.java

public class Student extends Person {
  public String somethingnew;

  public Student(String name) {
    super(name);
    somethingnew = "surprise!";
  }

  public String toString() {
    return super.toString() + "\t" + somethingnew;
  }

  public static void main(String[] args) {
    Person you = new Person("foo");
    Student me = new Student("boo");

    System.out.println("Your name is " + you);
    System.out.println("My name is " + me);
  }
}

Running Student (since it has the main function) yields us the desired outcome:

Your name is foo
My name is boo  surprise!

append new row to old csv file python

# I like using the codecs opening in a with 
field_names = ['latitude', 'longitude', 'date', 'user', 'text']
with codecs.open(filename,"ab", encoding='utf-8') as logfile:
    logger = csv.DictWriter(logfile, fieldnames=field_names)
    logger.writeheader()

# some more code stuff 

    for video in aList:
        video_result = {}                                     
        video_result['date'] = video['snippet']['publishedAt']
        video_result['user'] = video['id']
        video_result['text'] = video['snippet']['description'].encode('utf8')
        logger.writerow(video_result)

Can Android do peer-to-peer ad-hoc networking?

you can connect your android device to a known ad-hoc network.

edit /system/etc/wifi/tiwlan.ini

WiFiAdhoc = 1
dot11DesiredSSID = <your_network_ssid>
dot11DesiredBSSType = 0

edit /data/misc/wifi/wpa_supplicant.conf

ctrl_interface=tiwlan0
update_config=1
eapol_version=1
ap_scan=2

if that is too simplistic, see these instructions.

Get Number of Rows returned by ResultSet in Java

Statement st = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
ResultSet rs=st.executeQuery("select * from emp where deptno=31");
rs.last();
System.out.println("NoOfRows: "+rs.getRow());

first line of code says that we can move anywhere in the resultset( either to first row or last row or before first row without the need to traverse row by row starting from first row which is time taking).second line of code fetches the records matching the query here i am assuming (25 records), third line of code moves cursor to last row and final line of code gets the current row number which is 25 in my case. if there are no records, rs.last returns 0 and getrow moves cursor to before first row hence returning negative value indicates no records in db

How to access ssis package variables inside script component

On the front properties page of the variable script, amend the ReadOnlyVariables (or ReadWriteVariables) property and select the variables you are interested in. This will enable the selected variables within the script task
Within code you will now have access to read the variable as

string myString = Variables.MyVariableName.ToString();

How to add many functions in ONE ng-click?

ng-click "$watch(edit($index), open())"

Generic XSLT Search and Replace template

Here's one way in XSLT 2

<?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">   <xsl:template match="@*|node()">     <xsl:copy>       <xsl:apply-templates select="@*|node()"/>     </xsl:copy>   </xsl:template>   <xsl:template match="text()">     <xsl:value-of select="translate(.,'&quot;','''')"/>   </xsl:template> </xsl:stylesheet>

Doing it in XSLT1 is a little more problematic as it's hard to get a literal containing a single apostrophe, so you have to resort to a variable:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">   <xsl:template match="@*|node()">     <xsl:copy>       <xsl:apply-templates select="@*|node()"/>     </xsl:copy>   </xsl:template>   <xsl:variable name="apos">'</xsl:variable>   <xsl:template match="text()">     <xsl:value-of select="translate(.,'&quot;',$apos)"/>   </xsl:template> </xsl:stylesheet>

How to autowire RestTemplate using annotations

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
public class RestTemplateClient {
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

Map and Reduce in .NET

Linq equivalents of Map and Reduce: If you’re lucky enough to have linq then you don’t need to write your own map and reduce functions. C# 3.5 and Linq already has it albeit under different names.

Map is Select:

Enumerable.Range(1, 10).Select(x => x + 2);

Reduce is Aggregate:

Enumerable.Range(1, 10).Aggregate(0, (acc, x) => acc + x);

Filter is Where:

Enumerable.Range(1, 10).Where(x => x % 2 == 0);

https://www.justinshield.com/2011/06/mapreduce-in-c/

Is there any ASCII character for <br>?

<br> is an HTML element. There isn't any ASCII code for it.

But, for line break sometimes  is used as the text code.

Or <br>

You can check the text code here.

Select from where field not equal to Mysql Php

You can use also

select * from tablename where column1 ='a' and column2!='b';

getting a checkbox array value from POST

Your $_POST array contains the invite array, so reading it out as

<?php
if(isset($_POST['invite'])){
  $invite = $_POST['invite'];
  echo $invite;
}
?>

won't work since it's an array. You have to loop through the array to get all of the values.

<?php
if(isset($_POST['invite'])){
  if (is_array($_POST['invite'])) {
    foreach($_POST['invite'] as $value){
      echo $value;
    }
  } else {
    $value = $_POST['invite'];
    echo $value;
  }
}
?>

IIS 7, HttpHandler and HTTP Error 500.21

One solution that I've found is that you should have to change the .Net Framework back to v2.0 by Right Clicking on the site that you have manager under the Application Pools from the Advance Settings.

get UTC timestamp in python with datetime

I feel like the main answer is still not so clear, and it's worth taking the time to understand time and timezones.

The most important thing to understand when dealing with time is that time is relative!

2017-08-30 13:23:00: (a naive datetime), represents a local time somewhere in the world, but note that 2017-08-30 13:23:00 in London is NOT THE SAME TIME as 2017-08-30 13:23:00 in San Francisco.

Because the same time string can be interpreted as different points-in-time depending on where you are in the world, there is a need for an absolute notion of time.

A UTC timestamp is a number in seconds (or milliseconds) from Epoch (defined as 1 January 1970 00:00:00 at GMT timezone +00:00 offset).

Epoch is anchored on the GMT timezone and therefore is an absolute point in time. A UTC timestamp being an offset from an absolute time therefore defines an absolute point in time.

This makes it possible to order events in time.

Without timezone information, time is relative, and cannot be converted to an absolute notion of time without providing some indication of what timezone the naive datetime should be anchored to.

What are the types of time used in computer system?

naive datetime: usually for display, in local time (i.e. in the browser) where the OS can provide timezone information to the program.
UTC timestamps: A UTC timestamp is an absolute point in time, as mentioned above, but it is anchored in a given timezone, so a UTC timestamp can be converted to a datetime in any timezone, however it does not contain timezone information. What does that mean? That means that 1504119325 corresponds to 2017-08-30T18:55:24Z, or 2017-08-30T17:55:24-0100 or also 2017-08-30T10:55:24-0800. It doesn't tell you where the datetime recorded is from. It's usually used on the server side to record events (logs, etc...) or used to convert a timezone aware datetime to an absolute point in time and compute time differences.
ISO-8601 datetime string: The ISO-8601 is a standardized format to record datetime with timezone. (It's in fact several formats, read on here: https://en.wikipedia.org/wiki/ISO_8601) It is used to communicate timezone aware datetime information in a serializable manner between systems.

When to use which? or rather when do you need to care about timezones?

If you need in any way to care about time-of-day, you need timezone information. A calendar or alarm needs time-of-day to set a meeting at the correct time of the day for any user in the world. If this data is saved on a server, the server needs to know what timezone the datetime corresponds to.
To compute time differences between events coming from different places in the world, UTC timestamp is enough, but you lose the ability to analyze at what time of day events occured (ie. for web analytics, you may want to know when users come to your site in their local time: do you see more users in the morning or the evening? You can't figure that out without time of day information.

Timezone offset in a date string:

Another point that is important, is that timezone offset in a date string is not fixed. That means that because 2017-08-30T10:55:24-0800 says the offset -0800 or 8 hours back, doesn't mean that it will always be!

In the summer it may well be in daylight saving time, and it would be -0700

What that means is that timezone offset (+0100) is not the same as timezone name (Europe/France) or even timezone designation (CET)

America/Los_Angeles timezone is a place in the world, but it turns into PST (Pacific Standard Time) timezone offset notation in the winter, and PDT (Pacific Daylight Time) in the summer.

So, on top of getting the timezone offset from the datestring, you should also get the timezone name to be accurate.

Most packages will be able to convert numeric offsets from daylight saving time to standard time on their own, but that is not necessarily trivial with just offset. For example WAT timezone designation in West Africa, is UTC+0100 just like CET timezone in France, but France observes daylight saving time, while West Africa does not (because they're close to the equator)

So, in short, it's complicated. VERY complicated, and that's why you should not do this yourself, but trust a package that does it for you, and KEEP IT UP TO DATE!

OnClickListener in Android Studio

you will need to button initilzation inside method instead of trying to initlzing View's at class level do it as:

 Button button;  //<< declare here..

   @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button= (Button) findViewById(R.id.standingsButton); //<< initialize here
         // set OnClickListener for Button here
        button.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            startActivity(new Intent(MainActivity.this,StandingsActivity.class));
        }
      });
    }

Programmatically scroll to a specific position in an Android ListView

You need two things to precisely define the scroll position of a listView:

To get the current listView Scroll position:

int firstVisiblePosition = listView.getFirstVisiblePosition(); 
int topEdge=listView.getChildAt(0).getTop(); //This gives how much the top view has been scrolled.

To set the listView Scroll position:

listView.setSelectionFromTop(firstVisiblePosition,0);
// Note the '-' sign for scrollTo.. 
listView.scrollTo(0,-topEdge);

ViewDidAppear is not called when opening app from background

Swift 3.0 ++ version

In your viewDidLoad, register at notification center to listen to this opened from background action

NotificationCenter.default.addObserver(self, selector:#selector(doSomething), name: NSNotification.Name.UIApplicationWillEnterForeground, object: nil)

Then add this function and perform needed action

func doSomething(){
    //...
}

Finally add this function to clean up the notification observer when your view controller is destroyed.

deinit {
    NotificationCenter.default.removeObserver(self)
}

How to remove anaconda from windows completely?

Uninstall Anaconda from control Panel
Delete related folders, cache data and configurations from Users/user
Delete from AppData folder from hidden list
To remove start menu entry -> Go to C:/ProgramsData/Microsoft/Windows/ and delete Anaconda folder or search for anaconda in start menu and right click on anaconda prompt -> Show in Folder option. This will do almost cleaning of every anaconda file on your system.

Delete data with foreign key in SQL Server table

So, you need to DELETE related rows from conflicted tables or more logical to UPDATE their FOREIGN KEY column to reference other PRIMARY KEY's from the parent table.

Also, you may want to read this article Don’t Delete – Just Don’t

Using quotation marks inside quotation marks

in Python 3.2.2 on Windows,

print(""""A word that needs quotation marks" """)

is ok. I think it is the enhancement of Python interpretor.

Regular Expression to get all characters before "-"

I dont think you need regex to achieve this. I would look at the SubString method along with the indexOf method. If you need more help, add a comment showing what you have attempted and I will offer more help.

How to customize an end time for a YouTube video?

I just found out that the following works:

https://www.youtube.com/embed/[video_id]?start=[start_at_second]&end=[end_at_second]

Note: the time must be an integer number of seconds (e.g. 119, not 1m59s).

postgresql: INSERT INTO ... (SELECT * ...)

As Henrik wrote you can use dblink to connect remote database and fetch result. For example:

psql dbtest
CREATE TABLE tblB (id serial, time integer);
INSERT INTO tblB (time) VALUES (5000), (2000);

psql postgres
CREATE TABLE tblA (id serial, time integer);

INSERT INTO tblA
    SELECT id, time 
    FROM dblink('dbname=dbtest', 'SELECT id, time FROM tblB')
    AS t(id integer, time integer)
    WHERE time > 1000;

TABLE tblA;
 id | time 
----+------
  1 | 5000
  2 | 2000
(2 rows)

PostgreSQL has record pseudo-type (only for function's argument or result type), which allows you query data from another (unknown) table.

Edit:

You can make it as prepared statement if you want and it works as well:

PREPARE migrate_data (integer) AS
INSERT INTO tblA
    SELECT id, time
    FROM dblink('dbname=dbtest', 'SELECT id, time FROM tblB')
    AS t(id integer, time integer)
    WHERE time > $1;

EXECUTE migrate_data(1000);
-- DEALLOCATE migrate_data;

Edit (yeah, another):

I just saw your revised question (closed as duplicate, or just very similar to this).

If my understanding is correct (postgres has tbla and dbtest has tblb and you want remote insert with local select, not remote select with local insert as above):

psql dbtest

SELECT dblink_exec
(
    'dbname=postgres',
    'INSERT INTO tbla
        SELECT id, time
        FROM dblink
        (
            ''dbname=dbtest'',
            ''SELECT id, time FROM tblb''
        )
        AS t(id integer, time integer)
        WHERE time > 1000;'
);

I don't like that nested dblink, but AFAIK I can't reference to tblB in dblink_exec body. Use LIMIT to specify top 20 rows, but I think you need to sort them using ORDER BY clause first.

window.open with headers

As the best anwser have writed using XMLHttpResponse except window.open, and I make the abstracts-anwser as a instance.

The main Js file is download.js Download-JS

 // var download_url = window.BASE_URL+ "/waf/p1/download_rules";
    var download_url = window.BASE_URL+ "/waf/p1/download_logs_by_dt";
    function download33() {
        var sender_data = {"start_time":"2018-10-9", "end_time":"2018-10-17"};
        var x=new XMLHttpRequest();
        x.open("POST", download_url, true);
        x.setRequestHeader("Content-type","application/json");
//        x.setRequestHeader("Access-Control-Allow-Origin", "*");
        x.setRequestHeader("Authorization", "JWT " + localStorage.token );
        x.responseType = 'blob';
        x.onload=function(e){download(x.response, "test211.zip", "application/zip" ); }
        x.send( JSON.stringify(sender_data) ); // post-data
    }

How to hide Table Row Overflow?

If javascript is accepted as an answer, I made a jQuery plugin to address this issue (for more information about the issue see CSS: Truncate table cells, but fit as much as possible).

To use the plugin just type

$('selector').tableoverflow();

Plugin: https://github.com/marcogrcr/jquery-tableoverflow

Full example: http://jsfiddle.net/Cw7TD/3/embedded/result/

How to copy a selection to the OS X clipboard

Shift cmd c – set copy mode Drag mouse, select text, cmd c to copy selected text Cmd v to paste

"git rebase origin" vs."git rebase origin/master"

git rebase origin means "rebase from the tracking branch of origin", while git rebase origin/master means "rebase from the branch master of origin"

You must have a tracking branch in ~/Desktop/test, which means that git rebase origin knows which branch of origin to rebase with. If no tracking branch exists (in the case of ~/Desktop/fallstudie), git doesn't know which branch of origin it must take, and fails.

To fix this, you can make the branch track origin/master with:

git branch --set-upstream-to=origin/master

Or, if master isn't the currently checked-out branch:

git branch --set-upstream-to=origin/master master

The maximum recursion 100 has been exhausted before statement completion

it is just a sample to avoid max recursion error. we have to use option (maxrecursion 365); or option (maxrecursion 0);

DECLARE @STARTDATE datetime; 
DECLARE @EntDt datetime; 
set @STARTDATE = '01/01/2009';  
set @EntDt = '12/31/2009'; 
declare @dcnt int; 
;with DateList as   
 (   
    select @STARTDATE DateValue   
    union all   
    select DateValue + 1 from    DateList      
    where   DateValue + 1 < convert(VARCHAR(15),@EntDt,101)   
 )   
  select count(*) as DayCnt from (   
  select DateValue,DATENAME(WEEKDAY, DateValue ) as WEEKDAY from DateList
  where DATENAME(WEEKDAY, DateValue ) not IN ( 'Saturday','Sunday' )     
  )a
option (maxrecursion 365);

How to get a jqGrid selected row cells value

You can use in this manner also

var rowId =$("#list").jqGrid('getGridParam','selrow');  
var rowData = jQuery("#list").getRowData(rowId);
var colData = rowData['UserId'];   // perticuler Column name of jqgrid that you want to access

How to define a relative path in java

I was having issues attaching screenshots to ExtentReports using a relative path to my image file. My current directory when executing is "C:\Eclipse 64-bit\eclipse\workspace\SeleniumPractic". Under this, I created the folder ExtentReports for both the report.html and the image.png screenshot as below.

private String className = getClass().getName();
private String outputFolder = "ExtentReports\\";
private String outputFile = className  + ".html";
ExtentReports report;
ExtentTest test;

@BeforeMethod
    //  initialise report variables
    report = new ExtentReports(outputFolder + outputFile);
    test = report.startTest(className);
    // more setup code

@Test
    // test method code with log statements

@AfterMethod
    // takeScreenShot returns the relative path and filename for the image
    String imgFilename = GenericMethods.takeScreenShot(driver,outputFolder);
    String imagePath = test.addScreenCapture(imgFilename);
    test.log(LogStatus.FAIL, "Added image to report", imagePath);

This creates the report and image in the ExtentReports folder, but when the report is opened and the (blank) image inspected, hovering over the image src shows "Could not load the image" src=".\ExtentReports\QXKmoVZMW7.png".

This is solved by prefixing the relative path and filename for the image with the System Property "user.dir". So this works perfectly and the image appears in the html report.

Chris

String imgFilename = GenericMethods.takeScreenShot(driver,System.getProperty("user.dir") + "\\" + outputFolder);
String imagePath = test.addScreenCapture(imgFilename);
test.log(LogStatus.FAIL, "Added image to report", imagePath);

Gradle to execute Java class (without modifying build.gradle)

There is no direct equivalent to mvn exec:java in gradle, you need to either apply the application plugin or have a JavaExec task.

`application` plugin

Activate the plugin:

plugins {
    id 'application'
    ...
}

Configure it as follows:

application {
    mainClassName = project.hasProperty("mainClass") ? getProperty("mainClass") : "NULL"
}

On the command line, write

$ gradle -PmainClass=Boo run

`JavaExec` task

Define a task, let's say execute:

task execute(type:JavaExec) {
   main = project.hasProperty("mainClass") ? getProperty("mainClass") : "NULL"
   classpath = sourceSets.main.runtimeClasspath
}

To run, write gradle -PmainClass=Boo execute. You get

$ gradle -PmainClass=Boo execute
:compileJava
:compileGroovy UP-TO-DATE
:processResources UP-TO-DATE
:classes
:execute
I am BOO!

mainClass is a property passed in dynamically at command line. classpath is set to pickup the latest classes.

If you do not pass in the mainClass property, both of the approaches fail as expected.

$ gradle execute

FAILURE: Build failed with an exception.

* Where:
Build file 'xxxx/build.gradle' line: 4

* What went wrong:
A problem occurred evaluating root project 'Foo'.
> Could not find property 'mainClass' on task ':execute'.

Mapping composite keys using EF code first

Through Configuration, you can do this:

Model1
{
    int fk_one,
    int fk_two
}

Model2
{
    int pk_one,
    int pk_two,
}

then in the context config

public class MyContext : DbContext
{
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Model1>()
            .HasRequired(e => e.Model2)
            .WithMany(e => e.Model1s)
            .HasForeignKey(e => new { e.fk_one, e.fk_two })
            .WillCascadeOnDelete(false);
    }
}

Check if a value is in an array or not with Excel VBA

You want to check whether Examples exists in Range("A1").Value If it fails then to check Example right? I think mycode will work perfect. Please check.

Sub test()
Dim string1 As String, string2 As String
string1 = "Examples"
string2 = "Example"
If InStr(1, Range("A1").Value, string1) > 0 Then
    x = 1
ElseIf InStr(1, Range("A1").Value, string2) > 0 Then
    x = 2
End If

End Sub

In Java, what purpose do the keywords `final`, `finally` and `finalize` fulfil?

1. Final • Final is used to apply restrictions on class, method and variable. • Final class can't be inherited, final method can't be overridden and final variable value can't be changed. • Final variables are initialized at the time of creation except in case of blank final variable which is initialized in Constructor. • Final is a keyword.

2. Finally • Finally is used for exception handling along with try and catch. • It will be executed whether exception is handled or not. • This block is used to close the resources like database connection, I/O resources. • Finally is a block.

3. Finalize • Finalize is called by Garbage collection thread just before collecting eligible objects to perform clean up processing. • This is the last chance for object to perform any clean-up but since it’s not guaranteed that whether finalize () will be called, its bad practice to keep resource till finalize call. • Finalize is a method.

How to convert integer to decimal in SQL Server query?

SELECT height/10.0 AS HeightDecimal FROM dbo.whatever;

If you want a specific precision scale, then say so:

SELECT CONVERT(DECIMAL(16,4), height/10.0) AS HeightDecimal
  FROM dbo.whatever;

How to add items to array in nodejs

Here is example which can give you some hints to iterate through existing array and add items to new array. I use UnderscoreJS Module to use as my utility file.

You can download from (https://npmjs.org/package/underscore)

$ npm install underscore

Here is small snippet to demonstrate how you can do it.

var _ = require("underscore");
var calendars = [1, "String", {}, 1.1, true],
    newArray = [];

_.each(calendars, function (item, index) {
    newArray.push(item);
});

console.log(newArray);

Run PowerShell scripts on remote PC

After further investigating on PSExec tool, I think I got the answer. I need to add -i option to tell PSExec to launch process on remote in interactive mode:

PSExec \\RPC001 -i -u myID -p myPWD PowerShell C:\script\StartPS.ps1 par1 par2

Without -i, powershell.exe is running on the remote in waiting mode. Interesting point is that if I run a simple bat (without PS in bat), it works fine. Maybe this is something special for PS case? Welcome comments and explanations.

Can someone explain how to append an element to an array in C programming?

Short answer is: You don't have any choice other than:

arr[4] = 5;

How to delete an instantiated object Python?

What do you mean by delete? In Python, removing a reference (or a name) can be done with the del keyword, but if there are other names to the same object that object will not be deleted.

--> test = 3
--> print(test)
3
--> del test
--> print(test)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'test' is not defined

compared to:

--> test = 5
--> other is test  # check that both name refer to the exact same object
True
--> del test       # gets rid of test, but the object is still referenced by other
--> print(other)
5

How do I set default values for functions parameters in Matlab?

This is my simple way to set default values to a function, using "try":

function z = myfun (a,varargin)

%% Default values
b = 1;
c = 1;
d = 1;
e = 1;

try 
    b = varargin{1};
    c = varargin{2};
    d = varargin{3};
    e = varargin{4};
end

%% Calculation
z = a * b * c * d * e ;
end

Regards!

What does the line "#!/bin/sh" mean in a UNIX shell script?

#!/bin/sh or #!/bin/bash has to be first line of the script because if you don't use it on the first line then the system will treat all the commands in that script as different commands. If the first line is #!/bin/sh then it will consider all commands as a one script and it will show the that this file is running in ps command and not the commands inside the file.

./echo.sh

ps -ef |grep echo
trainee   3036  2717  0 16:24 pts/0    00:00:00 /bin/sh ./echo.sh
root      3042  2912  0 16:24 pts/1    00:00:00 grep --color=auto echo

Received an invalid column length from the bcp client for colid 6

I know this post is old but I ran into this same issue and finally figured out a solution to determine which column was causing the problem and report it back as needed. I determined that colid returned in the SqlException is not zero based so you need to subtract 1 from it to get the value. After that it is used as the index of the _sortedColumnMappings ArrayList of the SqlBulkCopy instance not the index of the column mappings that were added to the SqlBulkCopy instance. One thing to note is that SqlBulkCopy will stop on the first error received so this may not be the only issue but at least helps to figure it out.

try
{
    bulkCopy.WriteToServer(importTable);
    sqlTran.Commit();
}    
catch (SqlException ex)
{
    if (ex.Message.Contains("Received an invalid column length from the bcp client for colid"))
    {
        string pattern = @"\d+";
        Match match = Regex.Match(ex.Message.ToString(), pattern);
        var index = Convert.ToInt32(match.Value) -1;

        FieldInfo fi = typeof(SqlBulkCopy).GetField("_sortedColumnMappings", BindingFlags.NonPublic | BindingFlags.Instance);
        var sortedColumns = fi.GetValue(bulkCopy);
        var items = (Object[])sortedColumns.GetType().GetField("_items", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(sortedColumns);

        FieldInfo itemdata = items[index].GetType().GetField("_metadata", BindingFlags.NonPublic | BindingFlags.Instance);
        var metadata = itemdata.GetValue(items[index]);

        var column = metadata.GetType().GetField("column", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance).GetValue(metadata);
        var length = metadata.GetType().GetField("length", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance).GetValue(metadata);
        throw new DataFormatException(String.Format("Column: {0} contains data with a length greater than: {1}", column, length));
    }

    throw;
}

Use string contains function in oracle SQL query

By lines I assume you mean rows in the table person. What you're looking for is:

select p.name
from   person p
where  p.name LIKE '%A%'; --contains the character 'A'

The above is case sensitive. For a case insensitive search, you can do:

select p.name
from   person p
where  UPPER(p.name) LIKE '%A%'; --contains the character 'A' or 'a'

For the special character, you can do:

select p.name
from   person p
where  p.name LIKE '%'||chr(8211)||'%'; --contains the character chr(8211)

The LIKE operator matches a pattern. The syntax of this command is described in detail in the Oracle documentation. You will mostly use the % sign as it means match zero or more characters.

How to make a whole 'div' clickable in html and css without JavaScript?

jQuery would allow you to do that.

Look up the click() function: http://api.jquery.com/click/

Example:

$('#yourDIV').click(function() {
  alert('You clicked the DIV.');
});

Splitting a list into N parts of approximately equal length

This will do the split by a single expression:

>>> myList = range(18)
>>> parts = 5
>>> [myList[(i*len(myList))//parts:((i+1)*len(myList))//parts] for i in range(parts)]
[[0, 1, 2], [3, 4, 5, 6], [7, 8, 9], [10, 11, 12, 13], [14, 15, 16, 17]]

The list in this example has the size 18 and is divided into 5 parts. The size of the parts differs in no more than one element.

Specifying Style and Weight for Google Fonts

They use regular CSS.

Just use your regular font family like this:

font-family: 'Open Sans', sans-serif;

Now you decide what "weight" the font should have by adding

for semi-bold

font-weight:600;

for bold (700)

font-weight:bold;

for extra bold (800)

font-weight:800;

Like this its fallback proof, so if the google font should "fail" your backup font Arial/Helvetica(Sans-serif) use the same weight as the google font.

Pretty smart :-)

Note that the different font weights have to be specifically imported via the link tag url (family query param of the google font url) in the header.

For example the following link will include both weights 400 and 700:

<link href='fonts.googleapis.com/css?family=Comfortaa:400,700'; rel='stylesheet' type='text/css'>

How to download and save a file from Internet using Java?

1st Method using the new channel

ReadableByteChannel aq = Channels.newChannel(new url("https//asd/abc.txt").openStream());
FileOutputStream fileOS = new FileOutputStream("C:Users/local/abc.txt")
FileChannel writech = fileOS.getChannel();

2nd Method using FileUtils

FileUtils.copyURLToFile(new url("https//asd/abc.txt",new local file on system("C":/Users/system/abc.txt"));

3rd Method using

InputStream xy = new ("https//asd/abc.txt").openStream();

This is how we can download file by using basic java code and other third-party libraries. These are just for quick reference. Please google with the above keywords to get detailed information and other options.

What is an MDF file?

Just to make this absolutely clear for all:

A .MDF file is “typically” a SQL Server data file however it is important to note that it does NOT have to be.

This is because .MDF is nothing more than a recommended/preferred notation but the extension itself does not actually dictate the file type.

To illustrate this, if someone wanted to create their primary data file with an extension of .gbn they could go ahead and do so without issue.

To qualify the preferred naming conventions:

.mdf - Primary database data file.
.ndf - Other database data files i.e. non Primary.
.ldf - Log data file.

How can I delete a query string parameter in JavaScript?

Heres a complete function for adding and removing parameters based on this question and this github gist: https://gist.github.com/excalq/2961415

var updateQueryStringParam = function (key, value) {

    var baseUrl = [location.protocol, '//', location.host, location.pathname].join(''),
        urlQueryString = document.location.search,
        newParam = key + '=' + value,
        params = '?' + newParam;

    // If the "search" string exists, then build params from it
    if (urlQueryString) {

        updateRegex = new RegExp('([\?&])' + key + '[^&]*');
        removeRegex = new RegExp('([\?&])' + key + '=[^&;]+[&;]?');

        if( typeof value == 'undefined' || value == null || value == '' ) { // Remove param if value is empty

            params = urlQueryString.replace(removeRegex, "$1");
            params = params.replace( /[&;]$/, "" );

        } else if (urlQueryString.match(updateRegex) !== null) { // If param exists already, update it

            params = urlQueryString.replace(updateRegex, "$1" + newParam);

        } else { // Otherwise, add it to end of query string

            params = urlQueryString + '&' + newParam;

        }

    }
    window.history.replaceState({}, "", baseUrl + params);
};

You can add parameters like this:

updateQueryStringParam( 'myparam', 'true' );

And remove it like this:

updateQueryStringParam( 'myparam', null );

In this thread many said that the regex is probably not the best/stable solution ... so im not 100% sure if this thing has some flaws but as far as i tested it it works pretty fine.

Send Post Request with params using Retrofit

build.gradle

      compile 'com.google.code.gson:gson:2.6.2'

      compile 'com.squareup.retrofit2:retrofit:2.1.0'// compulsory

      compile 'com.squareup.retrofit2:converter-gson:2.1.0' //for retrofit conversion

Login APi Put Two Parameters

    {
        "UserId": "1234",
        "Password":"1234"
    }

Login Response

    {
        "UserId": "1234",
        "FirstName": "Keshav",
        "LastName": "Gera",
        "ProfilePicture": "312.113.221.1/GEOMVCAPI/Files/1.500534651736E12p.jpg"
    }

APIClient.java

    import retrofit2.Retrofit;
    import retrofit2.converter.gson.GsonConverterFactory;

    class APIClient {

        public static final String BASE_URL = "Your Base Url ";
        private static Retrofit retrofit = null;

        public static Retrofit getClient() {
            if (retrofit == null) {
                retrofit = new Retrofit.Builder()
                        .baseUrl(BASE_URL)
                        .addConverterFactory(GsonConverterFactory.create())
                        .build();
            }
            return retrofit;
        }
    }

APIInterface interface

    interface APIInterface {

        @POST("LoginController/Login")
        Call<LoginResponse> createUser(@Body LoginResponse login);
    }

Login Pojo

    package pojos;

    import com.google.gson.annotations.SerializedName;

    public class LoginResponse {


        @SerializedName("UserId")
        public String UserId;
        @SerializedName("FirstName")
        public String FirstName;
        @SerializedName("LastName")
        public String LastName;
        @SerializedName("ProfilePicture")
        public String ProfilePicture;
        @SerializedName("Password")
        public String Password;
        @SerializedName("ResponseCode")
        public String ResponseCode;
        @SerializedName("ResponseMessage")
        public String ResponseMessage;

        public LoginResponse(String UserId, String Password) {
            this.UserId = UserId;
            this.Password = Password;
        }

        public String getUserId() {
            return UserId;
        }

        public String getFirstName() {
            return FirstName;
        }

        public String getLastName() {
            return LastName;
        }

        public String getProfilePicture() {
            return ProfilePicture;
        }

        public String getResponseCode() {
            return ResponseCode;
        }

        public String getResponseMessage() {
            return ResponseMessage;
        }
    }

MainActivity

    package com.keshav.retrofitloginexampleworkingkeshav;

    import android.app.Dialog;
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.util.Log;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.TextView;
    import android.widget.Toast;

    import pojos.LoginResponse;
    import retrofit2.Call;
    import retrofit2.Callback;
    import retrofit2.Response;
    import utilites.CommonMethod;

    public class MainActivity extends AppCompatActivity {

        TextView responseText;
        APIInterface apiInterface;

        Button loginSub;
        EditText et_Email;
        EditText et_Pass;
        private Dialog mDialog;
        String userId;
        String password;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            apiInterface = APIClient.getClient().create(APIInterface.class);

            loginSub = (Button) findViewById(R.id.loginSub);
            et_Email = (EditText) findViewById(R.id.edtEmail);
            et_Pass = (EditText) findViewById(R.id.edtPass);

            loginSub.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (checkValidation()) {
                        if (CommonMethod.isNetworkAvailable(MainActivity.this))
                            loginRetrofit2Api(userId, password);
                        else
                            CommonMethod.showAlert("Internet Connectivity Failure", MainActivity.this);
                    }
                }
            });
        }

        private void loginRetrofit2Api(String userId, String password) {
            final LoginResponse login = new LoginResponse(userId, password);
            Call<LoginResponse> call1 = apiInterface.createUser(login);
            call1.enqueue(new Callback<LoginResponse>() {
                @Override
                public void onResponse(Call<LoginResponse> call, Response<LoginResponse> response) {
                    LoginResponse loginResponse = response.body();

                    Log.e("keshav", "loginResponse 1 --> " + loginResponse);
                    if (loginResponse != null) {
                        Log.e("keshav", "getUserId          -->  " + loginResponse.getUserId());
                        Log.e("keshav", "getFirstName       -->  " + loginResponse.getFirstName());
                        Log.e("keshav", "getLastName        -->  " + loginResponse.getLastName());
                        Log.e("keshav", "getProfilePicture  -->  " + loginResponse.getProfilePicture());

                        String responseCode = loginResponse.getResponseCode();
                        Log.e("keshav", "getResponseCode  -->  " + loginResponse.getResponseCode());
                        Log.e("keshav", "getResponseMessage  -->  " + loginResponse.getResponseMessage());
                        if (responseCode != null && responseCode.equals("404")) {
                            Toast.makeText(MainActivity.this, "Invalid Login Details \n Please try again", Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(MainActivity.this, "Welcome " + loginResponse.getFirstName(), Toast.LENGTH_SHORT).show();
                        }
                    }
                }

                @Override
                public void onFailure(Call<LoginResponse> call, Throwable t) {
                    Toast.makeText(getApplicationContext(), "onFailure called ", Toast.LENGTH_SHORT).show();
                    call.cancel();
                }
            });
        }

        public boolean checkValidation() {
            userId = et_Email.getText().toString();
            password = et_Pass.getText().toString();

            Log.e("Keshav", "userId is -> " + userId);
            Log.e("Keshav", "password is -> " + password);

            if (et_Email.getText().toString().trim().equals("")) {
                CommonMethod.showAlert("UserId Cannot be left blank", MainActivity.this);
                return false;
            } else if (et_Pass.getText().toString().trim().equals("")) {
                CommonMethod.showAlert("password Cannot be left blank", MainActivity.this);
                return false;
            }
            return true;
        }
    }

CommonMethod.java

    public class CommonMethod {


        public static final String DISPLAY_MESSAGE_ACTION =
                "com.codecube.broking.gcm";

        public static final String EXTRA_MESSAGE = "message";

        public  static boolean isNetworkAvailable(Context ctx) {
            ConnectivityManager connectivityManager
                    = (ConnectivityManager)ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
            return activeNetworkInfo != null && activeNetworkInfo.isConnected();
        }

        public static void showAlert(String message, Activity context) {

            final AlertDialog.Builder builder = new AlertDialog.Builder(context);
            builder.setMessage(message).setCancelable(false)
                    .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {

                        }
                    });
            try {
                builder.show();
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }

activity_main.xml

    <LinearLayout android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:orientation="vertical"
        xmlns:android="http://schemas.android.com/apk/res/android">

            <ImageView
                android:id="@+id/imgLogin"
                android:layout_width="200dp"
                android:layout_height="150dp"
                android:layout_gravity="center"
                android:layout_marginTop="20dp"
                android:padding="5dp"
                android:background="@mipmap/ic_launcher_round"
                />

            <TextView
                android:id="@+id/txtLogo"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/imgLogin"
                android:layout_centerHorizontal="true"
                android:text="Holostik Track and Trace"
                android:textSize="20dp"
                android:visibility="gone" />

            <android.support.design.widget.TextInputLayout
                android:id="@+id/textInputLayout1"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="@dimen/box_layout_margin_left"
                android:layout_marginRight="@dimen/box_layout_margin_right"
                android:layout_marginTop="8dp"
                android:padding="@dimen/text_input_padding">

                <EditText
                    android:id="@+id/edtEmail"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="5dp"
                    android:ems="10"
                    android:fontFamily="sans-serif"
                    android:gravity="top"
                    android:hint="Login ID"
                    android:maxLines="10"
                    android:paddingLeft="@dimen/edit_input_padding"
                    android:paddingRight="@dimen/edit_input_padding"
                    android:paddingTop="@dimen/edit_input_padding"
                    android:singleLine="true"></EditText>

            </android.support.design.widget.TextInputLayout>

            <android.support.design.widget.TextInputLayout
                android:id="@+id/textInputLayout2"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_below="@+id/textInputLayout1"
                android:layout_marginLeft="@dimen/box_layout_margin_left"
                android:layout_marginRight="@dimen/box_layout_margin_right"
                android:padding="@dimen/text_input_padding">

                <EditText
                    android:id="@+id/edtPass"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:focusable="true"
                    android:fontFamily="sans-serif"
                    android:hint="Password"
                    android:inputType="textPassword"

                    android:singleLine="true" />

            </android.support.design.widget.TextInputLayout>

            <RelativeLayout
                android:id="@+id/rel12"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/textInputLayout2"
                android:layout_marginTop="10dp"
                android:layout_marginLeft="10dp"
                >

                <Button
                    android:id="@+id/loginSub"
                    android:layout_width="wrap_content"
                    android:layout_height="45dp"
                    android:layout_alignParentRight="true"
                    android:layout_centerVertical="true"
                    android:background="@drawable/border_button"
                    android:paddingLeft="30dp"
                    android:paddingRight="30dp"
                    android:layout_marginRight="10dp"
                    android:text="Login"
                    android:textColor="#ffffff" />    
            </RelativeLayout>

    </LinearLayout>

How do I remove all HTML tags from a string without knowing which tags are in it?

You can parse the string using Html Agility pack and get the InnerText.

    HtmlDocument htmlDoc = new HtmlDocument();
    htmlDoc.LoadHtml(@"<b> Hulk Hogan's Celebrity Championship Wrestling &nbsp;&nbsp;&nbsp;<font color=\"#228b22\">[Proj # 206010]</font></b>&nbsp;&nbsp;&nbsp; (Reality Series, &nbsp;)");
    string result = htmlDoc.DocumentNode.InnerText;

Not equal <> != operator on NULL

Old question, but the following might offer some more detail.

null represents no value or an unknown value. It doesn’t specify why there is no value, which can lead to some ambiguity.

Suppose you run a query like this:

SELECT *
FROM orders
WHERE delivered=ordered;

that is, you are looking for rows where the ordered and delivered dates are the same.

What is to be expected when one or both columns are null?

Because at least one of the dates is unknown, you cannot expect to say that the 2 dates are the same. This is also the case when both dates are unknown: how can they be the same if we don’t even know what they are?

For this reason, any expression treating null as a value must fail. In this case, it will not match. This is also the case if you try the following:

SELECT *
FROM orders
WHERE delivered<>ordered;

Again, how can we say that two values are not the same if we don’t know what they are.

SQL has a specific test for missing values:

IS NULL

Specifically it is not comparing values, but rather it seeks out missing values.

Finally, as regards the != operator, as far as I am aware, it is not actually in any of the standards, but it is very widely supported. It was added to make programmers from some languages feel more at home. Frankly, if a programmer has difficulty remembering what language they’re using, they’re off to a bad start.

Get Cell Value from Excel Sheet with Apache Poi

May be by:-

    for(Row row : sheet) {          
        for(Cell cell : row) {              
            System.out.print(cell.getStringCellValue());

        }
    }

For specific type of cell you can try:

switch (cell.getCellType()) {
case Cell.CELL_TYPE_STRING:
    cellValue = cell.getStringCellValue();
    break;

case Cell.CELL_TYPE_FORMULA:
    cellValue = cell.getCellFormula();
    break;

case Cell.CELL_TYPE_NUMERIC:
    if (DateUtil.isCellDateFormatted(cell)) {
        cellValue = cell.getDateCellValue().toString();
    } else {
        cellValue = Double.toString(cell.getNumericCellValue());
    }
    break;

case Cell.CELL_TYPE_BLANK:
    cellValue = "";
    break;

case Cell.CELL_TYPE_BOOLEAN:
    cellValue = Boolean.toString(cell.getBooleanCellValue());
    break;

}

Google Maps V3 - How to calculate the zoom level for a given bounds

Work example to find average default center with react-google-maps on ES6:

const bounds = new google.maps.LatLngBounds();
paths.map((latLng) => bounds.extend(new google.maps.LatLng(latLng)));
const defaultCenter = bounds.getCenter();
<GoogleMap
 defaultZoom={paths.length ? 12 : 4}
 defaultCenter={defaultCenter}
>
 <Marker position={{ lat, lng }} />
</GoogleMap>

How does one output bold text in Bash?

I assume bash is running on a vt100-compatible terminal in which the user did not explicitly turn off the support for formatting.

First, turn on support for special characters in echo, using -e option. Later, use ansi escape sequence ESC[1m, like:

echo -e "\033[1mSome Text"

More on ansi escape sequences for example here: ascii-table.com/ansi-escape-sequences-vt-100.php

What are my options for storing data when using React Native? (iOS and Android)

Folks above hit the right notes for storage, though if you also need to consider any PII data that needs to be stored then you can also stash into the keychain using something like https://github.com/oblador/react-native-keychain since ASyncStorage is unencrypted. It can be applied as part of the persist configuration in something like redux-persist.

Equivalent of waitForVisible/waitForElementPresent in Selenium WebDriver tests using Java?

Implicit and Explicit Waits

Implicit Wait

An implicit wait is to tell WebDriver to poll the DOM for a certain amount of time when trying to find an element or elements if they are not immediately available. The default setting is 0. Once set, the implicit wait is set for the life of the WebDriver object instance.

driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

Explicit Wait + Expected Conditions

An explicit waits is code you define to wait for a certain condition to occur before proceeding further in the code. The worst case of this is Thread.sleep(), which sets the condition to an exact time period to wait. There are some convenience methods provided that help you write code that will wait only as long as required. WebDriverWait in combination with ExpectedCondition is one way this can be accomplished.

WebDriverWait wait = new WebDriverWait(driver, 10);
WebElement element = wait.until(
        ExpectedConditions.visibilityOfElementLocated(By.id("someid")));

Setting HTTP headers

I know this is a different twist on the answer, but isn't this more of a concern for a web server? For example, nginx, could help.

The ngx_http_headers_module module allows adding the “Expires” and “Cache-Control” header fields, and arbitrary fields, to a response header

...

location ~ ^<REGXP MATCHING CORS ROUTES> {
    add_header Access-Control-Allow-Methods POST
    ...
}
...

Adding nginx in front of your go service in production seems wise. It provides a lot more feature for authorizing, logging,and modifying requests. Also, it gives the ability to control who has access to your service and not only that but one can specify different behavior for specific locations in your app, as demonstrated above.

I could go on about why to use a web server with your go api, but I think that's a topic for another discussion.

Sorting a set of values

From a comment:

I want to sort each set.

That's easy. For any set s (or anything else iterable), sorted(s) returns a list of the elements of s in sorted order:

>>> s = set(['0.000000000', '0.009518000', '10.277200999', '0.030810999', '0.018384000', '4.918560000'])
>>> sorted(s)
['0.000000000', '0.009518000', '0.018384000', '0.030810999', '10.277200999', '4.918560000']

Note that sorted is giving you a list, not a set. That's because the whole point of a set, both in mathematics and in almost every programming language,* is that it's not ordered: the sets {1, 2} and {2, 1} are the same set.

You probably don't really want to sort those elements as strings, but as numbers (so 4.918560000 will come before 10.277200999 rather than after).

The best solution is most likely to store the numbers as numbers rather than strings in the first place. But if not, you just need to use a key function:

>>> sorted(s, key=float)
['0.000000000', '0.009518000', '0.018384000', '0.030810999', '4.918560000', '10.277200999']

For more information, see the Sorting HOWTO in the official docs.

* See the comments for exceptions.

deleting folder from java

It will delete a folder recursively

public static void folderdel(String path){
    File f= new File(path);
    if(f.exists()){
        String[] list= f.list();
        if(list.length==0){
            if(f.delete()){
                System.out.println("folder deleted");
                return;
            }
        }
        else {
            for(int i=0; i<list.length ;i++){
                File f1= new File(path+"\\"+list[i]);
                if(f1.isFile()&& f1.exists()){
                    f1.delete();
                }
                if(f1.isDirectory()){
                    folderdel(""+f1);
                }
            }
            folderdel(path);
        }
    }
}

ReactJS and images in public folder

You Could also use this.. it works assuming 'yourimage.jpg' is in your public folder.

<img src={'./yourimage.jpg'}/>

What does !important mean in CSS?

It means, essentially, what it says; that 'this is important, ignore subsequent rules, and any usual specificity issues, apply this rule!'

In normal use a rule defined in an external stylesheet is overruled by a style defined in the head of the document, which, in turn, is overruled by an in-line style within the element itself (assuming equal specificity of the selectors). Defining a rule with the !important 'attribute' (?) discards the normal concerns as regards the 'later' rule overriding the 'earlier' ones.

Also, ordinarily, a more specific rule will override a less-specific rule. So:

a {
    /* css */
}

Is normally overruled by:

body div #elementID ul li a {
    /* css */
}

As the latter selector is more specific (and it doesn't, normally, matter where the more-specific selector is found (in the head or the external stylesheet) it will still override the less-specific selector (in-line style attributes will always override the 'more-', or the 'less-', specific selector as it's always more specific.

If, however, you add !important to the less-specific selector's CSS declaration, it will have priority.

Using !important has its purposes (though I struggle to think of them), but it's much like using a nuclear explosion to stop the foxes killing your chickens; yes, the foxes will be killed, but so will the chickens. And the neighbourhood.

It also makes debugging your CSS a nightmare (from personal, empirical, experience).

Convert UIImage to NSData and convert back to UIImage in Swift?

UIImage(data:imageData,scale:1.0) presuming the image's scale is 1.

In swift 4.2, use below code for get Data().

image.pngData()

High CPU Utilization in java application - why?

You did not assign the "linux" to the question but you mentioned "Linux top". And thus this might be helpful:

Use the small Linux tool threadcpu to identify the most cpu using threads. It calls jstack to get the thread name. And with "sort -n" in pipe you get the list of threads ordered by cpu usage.

More details can be found here: http://www.tuxad.com/blog/archives/2018/10/01/threadcpu_-_show_cpu_usage_of_threads/index.html

And if you still need more details then create a thread dump or run strace on the thread.

Uncaught TypeError: Cannot use 'in' operator to search for 'length' in

The in operator only works on objects. You are using it on a string. Make sure your value is an object before you using $.each. In this specific case, you have to parse the JSON:

$.each(JSON.parse(myData), ...);

Pass values of checkBox to controller action in asp.net mvc4

For the MVC Controller method, use a nullable boolean type:

public ActionResult Index( string responsables, bool? checkResp) { etc. }

Then if the check box is checked, checkResp will be true. If not, it will be null.

How to Correctly Use Lists in R?

x = list(1, 2, 3, 4)
x2 = list(1:4)
all.equal(x,x2)

is not the same because 1:4 is the same as c(1,2,3,4). If you want them to be the same then:

x = list(c(1,2,3,4))
x2 = list(1:4)
all.equal(x,x2)

How to parse XML in Bash?

Another command line tool is my new Xidel. It also supports XPath 2 and XQuery, contrary to the already mentioned xpath/xmlstarlet.

The title can be read like:

xidel xhtmlfile.xhtml -e /html/head/title > titleOfXHTMLPage.txt

And it also has a cool feature to export multiple variables to bash. For example

eval $(xidel xhtmlfile.xhtml -e 'title := //title, imgcount := count(//img)' --output-format bash )

sets $title to the title and $imgcount to the number of images in the file, which should be as flexible as parsing it directly in bash.

Unexpected token }

Try running the entire script through jslint. This may help point you at the cause of the error.

Edit Ok, it's not quite the syntax of the script that's the problem. At least not in a way that jslint can detect.

Having played with your live code at http://ft2.hostei.com/ft.v1/, it looks like there are syntax errors in the generated code that your script puts into an onclick attribute in the DOM. Most browsers don't do a very good job of reporting errors in JavaScript run via such things (what is the file and line number of a piece of script in the onclick attribute of a dynamically inserted element?). This is probably why you get a confusing error message in Chrome. The FireFox error message is different, and also doesn't have a useful line number, although FireBug does show the code which causes the problem.

This snippet of code is taken from your edit function which is in the inline script block of your HTML:

var sub = document.getElementById('submit');
...
sub.setAttribute("onclick", "save(\""+file+"\", document.getElementById('name').value, document.getElementById('text').value");

Note that this sets the onclick attribute of an element to invalid JavaScript code:

<input type="submit" id="submit" onclick="save("data/wasup.htm", document.getElementById('name').value, document.getElementById('text').value">

The JS is:

save("data/wasup.htm", document.getElementById('name').value, document.getElementById('text').value

Note the missing close paren to finish the call to save.

As an aside, inserting onclick attributes is not a very modern or clean way of adding event handlers in JavaScript. Why are you not using the DOM's addEventListener to simply hook up a function to the element? If you were using something like jQuery, this would be simpler still.

Is there an API to get bank transaction and bank balance?

Just a helpful hint, there is a company called Yodlee.com who provides this data. They do charge for the API. Companies like Mint.com use this API to gather bank and financial account data.

Also, checkout https://plaid.com/, they are a similar company Yodlee.com and provide both authentication API for several banks and REST-based transaction fetching endpoints.

Excel - programm cells to change colour based on another cell

Use conditional formatting.

You can enter a condition using any cell you like and a format to apply if the formula is true.

Best way to alphanumeric check in JavaScript

The asker's original inclination to use str.charCodeAt(i) appears to be faster than the regular expression alternative. In my test on jsPerf the RegExp option performs 66% slower in Chrome 36 (and slightly slower in Firefox 31).

Here's a cleaned-up version of the original validation code that receives a string and returns true or false:

function isAlphaNumeric(str) {
  var code, i, len;

  for (i = 0, len = str.length; i < len; i++) {
    code = str.charCodeAt(i);
    if (!(code > 47 && code < 58) && // numeric (0-9)
        !(code > 64 && code < 91) && // upper alpha (A-Z)
        !(code > 96 && code < 123)) { // lower alpha (a-z)
      return false;
    }
  }
  return true;
};

Of course, there may be other considerations, such as readability. A one-line regular expression is definitely prettier to look at. But if you're strictly concerned with speed, you may want to consider this alternative.

JSON character encoding

Also, you can use spring annotation RequestMapping above controller class for receveing application/json;utf-8 in all responses

@Controller
@RequestMapping(produces = {"application/json; charset=UTF-8","*/*;charset=UTF-8"})
public class MyController{
 ...
}

Markdown to create pages and table of contents?

For me, the solution proposed by @Tum works like a charm for a table of contents with 2 levels. However, for the 3rd level it didn't work. It didn't display the link as for the first 2 levels, it displays the plain text 3.5.1. [bla bla bla](#blablabla) <br> instead.

My solution is an addition to the solution of @Tum (which is very simple) for people who need a table of contents with 3 levels or more.

On the second level, a simple tab will do the indent correctly for you. But it doesn't support 2 tabs. Instead, you have to use one tab and add as many   as needed yourself in order to align the 3rd level correctly.

Here's an example using 4 levels (higher the levels, awful it becomes):

# Table of Contents
1. [Title](#title) <br>
    1.1. [sub-title](#sub_title) <br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.1.1. [sub-sub-title](#sub_sub_title)
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.1.1.1. [sub-sub-sub-title](#sub_sub_sub_title)

# Title <a name="title"></a>
Heading 1

## Sub-Title <a name="sub_title"></a>
Heading 2

### Sub-Sub-Title <a name="sub_sub_title"></a>
Heading 3

#### Sub-Sub-Sub-Title <a name="sub_sub_sub_title"></a>
Heading 4

This gives the following result where every element of the table of contents is a link to its corresponding section. Note also the <br> in order to add a new line instead of being on the same line.

Title
1.1. Sub-Title
1.1.1. Sub-Sub-Title
1.1.1.1. Sub-Sub-Sub-Title

Title

Heading 1

Sub-Title

Heading 2

Sub-Sub-Title

Heading 3

Sub-Sub-Sub-Title

Heading 4

What is a PDB file?

PDB is an abbreviation for Program Data Base. As the name suggests, it is a repository (persistent storage such as databases) to maintain information required to run your program in debug mode. It contains many important relevant information required while you debug your code (in Visual Studio), for e.g. at what points you have inserted break points where you expect the debugger to break in Visual Studio.

This is the reason why many times Visual Studio fails to hit the break points if you remove the *.pdb files from your debug folders. Visual Studio debugger is also able to tell you the precise line number of code file at which an exception occurred in a stack trace with the help of *.pdb files. So effectively pdb files are really a boon to developers while debugging a program.

Generally it is not recommended to exclude the generation of *.pdb files. From production release stand-point what you should be doing is create the pdb files but don't ship them to customer site in product installer. Preserve all the generated PDB files on to a symbol server from where it can be used/referenced in future if required. Specially for cases when you debug issues like process crash. When you start analysing the crash dump files and if your original *.pdb files created during the build process are not preserved then Visual Studio will not be able to make out the exact line of code which is causing crash.

If you still want to disable generation of *.pdb files altogether for any release then go to properties of the project -> Build Tab -> Click on Advanced button -> Choose none from "Debug Info" drop-down box -> press OK as shown in the snapshot below.

Note: This setting will have to be done separately for "Debug" and "Release" build configurations.

Fixed width buttons with Bootstrap

With BS 4, you can also use the sizing, and apply w-100 so that the button can occupy the complete width of the parent container.

_x000D_

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.3/css/bootstrap.min.css" rel="stylesheet" />_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
_x000D_
<p>_x000D_
  Using btn-block_x000D_
</p>_x000D_
<div class="container-fluid">_x000D_
  <div class="btn-group col" role="group" aria-label="Basic example">_x000D_
    <button type="button" class="btn btn-outline-secondary">Left</button>_x000D_
    <button type="button" class="btn btn-outline-secondary btn-block">Middle</button>_x000D_
    <button type="button" class="btn btn-outline-secondary">Right</button>_x000D_
  </div>_x000D_
</div>_x000D_
_x000D_
<p>_x000D_
  Using w-100_x000D_
</p>_x000D_
<div class="container-fluid">_x000D_
  <div class="btn-group col" role="group" aria-label="Basic example">_x000D_
    <button type="button" class="btn btn-outline-secondary">Left</button>_x000D_
    <button type="button" class="btn btn-outline-secondary w-100">Middle</button>_x000D_
    <button type="button" class="btn btn-outline-secondary">Right</button>_x000D_
  </div>_x000D_
</div>

_x000D_

Using set_facts and with_items together in Ansible

Looks like this behavior is how Ansible currently works, although there is a lot of interest in fixing it to work as desired. There's currently a pull request with the desired functionality so hopefully this will get incorporated into Ansible eventually.

How to embed HTML into IPython output?

Some time ago Jupyter Notebooks started stripping JavaScript from HTML content [#3118]. Here are two solutions:

Serving Local HTML

If you want to embed an HTML page with JavaScript on your page now, the easiest thing to do is to save your HTML file to the directory with your notebook and then load the HTML as follows:

from IPython.display import IFrame

IFrame(src='./nice.html', width=700, height=600)

Serving Remote HTML

If you prefer a hosted solution, you can upload your HTML page to an Amazon Web Services "bucket" in S3, change the settings on that bucket so as to make the bucket host a static website, then use an Iframe component in your notebook:

from IPython.display import IFrame

IFrame(src='https://s3.amazonaws.com/duhaime/blog/visualizations/isolation-forests.html', width=700, height=600)

This will render your HTML content and JavaScript in an iframe, just like you can on any other web page:

_x000D_

<iframe src='https://s3.amazonaws.com/duhaime/blog/visualizations/isolation-forests.html', width=700, height=600></iframe>

_x000D_

What exactly does the .join() method do?

On providing this as input ,

li = ['server=mpilgrim', 'uid=sa', 'database=master', 'pwd=secret']
s = ";".join(li)
print(s)

Python returns this as output :

'server=mpilgrim;uid=sa;database=master;pwd=secret'

load external css file in body tag

No, it is not okay to put a link element in the body tag. See the specification (links to the HTML4.01 specs, but I believe it is true for all versions of HTML):

“This element defines a link. Unlike A, it may only appear in the HEAD section of a document, although it may appear any number of times.”

Create Hyperlink in Slack

python

x = "http://xxxxxx"
y = "text title"
text_link = '<{}|{}>'.format(x,y)

post text_link in using python slack client

git - Server host key not cached

Just uninstall Git Extensions and Install again by choosing OpenSSH instead of

Execution time of C program

(All answers here are lacking, if your sysadmin changes the systemtime, or your timezone has differing winter- and sommer-times. Therefore...)

On linux use: clock_gettime(CLOCK_MONOTONIC_RAW, &time_variable); It's not affected if the system-admin changes the time, or you live in a country with winter-time different from summer-time, etc.

#include <stdio.h>
#include <time.h>

#include <unistd.h> /* for sleep() */

int main() {
    struct timespec begin, end;
    clock_gettime(CLOCK_MONOTONIC_RAW, &begin);

    sleep(1);      // waste some time

    clock_gettime(CLOCK_MONOTONIC_RAW, &end);

    printf ("Total time = %f seconds\n",
            (end.tv_nsec - begin.tv_nsec) / 1000000000.0 +
            (end.tv_sec  - begin.tv_sec));

}

man clock_gettime states:

CLOCK_MONOTONIC
              Clock  that  cannot  be set and represents monotonic time since some unspecified starting point.  This clock is not affected by discontinuous jumps in the system time
              (e.g., if the system administrator manually changes the clock), but is affected by the incremental adjustments performed by adjtime(3) and NTP.

SQL Server convert select a column and convert it to a string

Use LISTAGG function, ex. SELECT LISTAGG(colmn) FROM table_name;

The forked VM terminated without saying properly goodbye. VM crash or System.exit called

In my case, the issue was related to workspace path which was to much long. So I did a path refactoring and this solved the issue to me.

java.io.StreamCorruptedException: invalid stream header: 7371007E

If you are sending multiple objects, it's often simplest to put them some kind of holder/collection like an Object[] or List. It saves you having to explicitly check for end of stream and takes care of transmitting explicitly how many objects are in the stream.

EDIT: Now that I formatted the code, I see you already have the messages in an array. Simply write the array to the object stream, and read the array on the server side.

Your "server read method" is only reading one object. If it is called multiple times, you will get an error since it is trying to open several object streams from the same input stream. This will not work, since all objects were written to the same object stream on the client side, so you have to mirror this arrangement on the server side. That is, use one object input stream and read multiple objects from that.

(The error you get is because the objectOutputStream writes a header, which is expected by objectIutputStream. As you are not writing multiple streams, but simply multiple objects, then the next objectInputStream created on the socket input fails to find a second header, and throws an exception.)

To fix it, create the objectInputStream when you accept the socket connection. Pass this objectInputStream to your server read method and read Object from that.

How to change the opacity (alpha, transparency) of an element in a canvas element after it has been drawn?

I think this answers the question best, it actually changes the alpha value of something that has been drawn already. Maybe this wasn't part of the api when this question was asked.

Given 2d context c.

function reduceAlpha(x, y, w, h, dA) {
    let screenData = c.getImageData(x, y, w, h);
    for(let i = 3; i < screenData.data.length; i+=4){
        screenData.data[i] -= dA; //delta-Alpha
    }
    c.putImageData(screenData, x, y );
}

How to set alignment center in TextBox in ASP.NET?

Add the css styling text-align: center to the control.

Ideally you would do this through a css class assigned to the control, but if you must do it directly, here is an example:

<asp:TextBox ID="myTextBox" runat="server" style="text-align: center"></asp:TextBox>

Gmail: 530 5.5.1 Authentication Required. Learn more at

You need to go here https://security.google.com/settings/security/apppasswords

then select Gmail and then select device. then click on Generate. Simply Copy & Paste password which is generated by Google.

Read a variable in bash with a default value

You can use parameter expansion, e.g.

read -p "Enter your name [Richard]: " name
name=${name:-Richard}
echo $name

Including the default value in the prompt between brackets is a fairly common convention

What does the :-Richard part do? From the bash manual:

${parameter:-word} If parameter is unset or null, the expansion of word is substituted. Otherwise, the value of parameter is substituted.

Also worth noting that...

In each of the cases below, word is subject to tilde expansion, parameter expansion, command substitution, and arithmetic expansion.

So if you use webpath=${webpath:-~/httpdocs} you will get a result of /home/user/expanded/path/httpdocs not ~/httpdocs, etc.

ADB Driver and Windows 8.1

If all other solutions did not work for your device try this guide how to make a truly universal adb and fastboot driver out of Google USB driver. The resulting driver works for adb, recovery and fastboot modes in all versions of Windows.

What is the default Jenkins password?

The password is present in the log generated by docker run image as shown in the example below.

Jenkins Docker run log

Additionally you can check the directory /var/jenkins_home/secrets/ Its in the file name initialAdminPassword

You can use cat /var/jenkins_home/secrets/initialAdminPassword to read it.

Connection Java-MySql : Public Key Retrieval is not allowed

I found this issue frustrating because I was able to interact with the database yesterday, but after coming back this morning, I started getting this error.

I tried adding the allowPublicKeyRetrieval=true flag, but I kept getting the error.

What fixed it for me was doing Project->Clean in Eclipse and Clean on my Tomcat server. One (or both) of those fixed it.

I don't understand why, because I build my project using Maven, and have been restarting my server after each code change. Very irritating...

Visual Studio Expand/Collapse keyboard shortcuts

For collapse, you can try CTRL + M + O and expand using CTRL + M + P. This works in VS2008.

How to read a string one letter at a time in python

# Open the file
f = open('morseCode.txt', 'r')

# Read the morse code data into "letters" [(lowercased letter, morse code), ...]
letters = []
for Line in f:
    if not Line.strip(): break
    letter, code = Line.strip().split() # Assuming the format is <letter><whitespace><morse code><newline>
    letters.append((letter.lower(), code))
f.close()

# Get the input from the user
# (Don't use input() - it calls eval(raw_input())!)
i = raw_input("Enter a string to be converted to morse code or press <enter> to quit ") 

# Convert the codes to morse code
out = []
for c in i:
    found = False
    for letter, code in letters:
        if letter == c.lower():
            found = True
            out.append(code)
            break

    if not found: 
        raise Exception('invalid character: %s' % c)

# Print the output
print ' '.join(out)

Invalid length for a Base-64 char array

The encrypted string had two special characters, + and =.

'+' sign was giving the error, so below solution worked well:

//replace + sign

encryted_string = encryted_string.Replace("+", "%2b");

//`%2b` is HTTP encoded string for **+** sign

//encode special charactes 

encryted_string = HttpUtility.UrlEncode(encryted_string);

//then pass it to the decryption process
...

reading from stdin in c++

You have not defined the variable input_line.

Add this:

string input_line;

And add this include.

#include <string>

Here is the full example. I also removed the semi-colon after the while loop, and you should have getline inside the while to properly detect the end of the stream.

#include <iostream>
#include <string>

int main() {
    for (std::string line; std::getline(std::cin, line);) {
        std::cout << line << std::endl;
    }
    return 0;
}

How to create custom button in Android using XML Styles

Have you ever tried to create the background shape for any buttons?

Check this out below:

Below is the separated image from your image of a button.

enter image description here

Now, put that in your ImageButton for android:src "source" like so:

android:src="@drawable/twitter"

Now, just create shape of the ImageButton to have a black shader background.

android:background="@drawable/button_shape"

and the button_shape is the xml file in drawable resource:

    <?xml version="1.0" encoding="UTF-8"?>
<shape 
    xmlns:android="http://schemas.android.com/apk/res/android">
    <stroke 
        android:width="1dp" 
        android:color="#505050"/>
    <corners 
        android:radius="7dp" />

    <padding 
        android:left="1dp"
        android:right="1dp"
        android:top="1dp"
        android:bottom="1dp"/>

    <solid android:color="#505050"/>

</shape>

Just try to implement it with this. You might need to change the color value as per your requirement.

Let me know if it doesn't work.

Python error: "IndexError: string index out of range"

This error would happen when the number of guesses (so_far) is less than the length of the word. Did you miss an initialization for the variable so_far somewhere, that sets it to something like

so_far = " " * len(word)

Edit:

try something like

print "%d / %d" % (new, so_far)

before the line that throws the error, so you can see exactly what goes wrong. The only thing I can think of is that so_far is in a different scope, and you're not actually using the instance you think.

How to copy text from a div to clipboard

Adding the link as an Answer to draw more attention to Aaron Lavers' comment below the first answer.

This works like a charm - http://clipboardjs.com. Just add the clipboard.js or min file. While initiating, use the class which has the html component to be clicked and just pass the id of the component with the content to be copied, to the click element.

How to use Apple's new San Francisco font on a webpage

You can not use Apple System Font served directly from a database. It's against the License, but you can use this for Mac Systems higher than High Sierra

body 
{
  font-family: -apple-system, "Helvetica Neue", "Lucida Grande";
}

Or you can use this:

font-family: 'BlinkMacSystemFont';

Programs & Examples On #Blocked

Access blocked by CORS policy: Response to preflight request doesn't pass access control check

origin 'http://localhost:4200' has been blocked by CORS policy in Angular7

Has been blocked by CORS policy: Response to preflight request doesn’t pass access control check

installation app blocked by play protect

Cross-Origin Read Blocking (CORB)

How to make audio autoplay on chrome

"Could not get any response" response when using postman with subdomain

How to solve 'Redirect has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header'?

XMLHttpRequest blocked by CORS Policy

Access to Image from origin 'null' has been blocked by CORS policy

Resource blocked due to MIME type mismatch (X-Content-Type-Options: nosniff)

A Parser-blocking, cross-origin script is invoked via document.write - how to circumvent it?

WARNING: sanitizing unsafe style value url

Page loaded over HTTPS but requested an insecure XMLHttpRequest endpoint

Content Security Policy: The page's settings blocked the loading of a resource

Firefox

Chrome

Facebook login message: "URL Blocked: This redirect failed because the redirect URI is not whitelisted in the app’s Client OAuth Settings."

"Mixed content blocked" when running an HTTP AJAX operation in an HTTPS page

Can a website detect when you are using Selenium with chromedriver?

Considerations for browser detection

Alternative of browser detection through UserAgents

Solution

Dealing with reCAPTCHA

jQuery ajax request being block because Cross-Origin

CORS header 'Access-Control-Allow-Origin' missing

Transport security has blocked a cleartext HTTP

How can I add NSAppTransportSecurity to my info.plist file?

Apache Server (xampp) doesn't run on Windows 10 (Port 80)

Plotting in a non-blocking way with Matplotlib

How to find Google's IP address?

XAMPP: Couldn't start Apache (Windows 10)

how to create virtual host on XAMPP

How can I fix the 'Missing Cross-Origin Resource Sharing (CORS) Response Header' webfont issue?

How to detect query which holds the lock in Postgres?

Font from origin has been blocked from loading by Cross-Origin Resource Sharing policy

SecurityError: Blocked a frame with origin from accessing a cross-origin frame

Install Chrome extension form outside the Chrome Web Store

Firefox 'Cross-Origin Request Blocked' despite headers

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at

error running apache after xampp install

Socket.io + Node.js Cross-Origin Request Blocked

Ajax Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource

ORA-12528: TNS Listener: all appropriate instances are blocking new connections. Instance "CLRExtProc", status UNKNOWN

Failed to load resource: net::ERR_INSECURE_RESPONSE

Unable to launch the IIS Express Web server, Failed to register URL, Access is denied

Getting "net::ERR_BLOCKED_BY_CLIENT" error on some AJAX calls

Javascript window.print() in chrome, closing new window or tab instead of cancelling print leaves javascript blocked in parent window

How are people unit testing with Entity Framework 6, should you bother?

Cross-Origin Request Blocked

I am getting Failed to load resource: net::ERR_BLOCKED_BY_CLIENT with Google chrome

How to unblock with mysqladmin flush hosts

How does Facebook disable the browser's integrated Developer Tools?

External resource not being loaded by AngularJs

"application blocked by security settings" prevent applets running using oracle SE 7 update 51 on firefox on Linux mint

"CAUTION: provisional headers are shown" in Chrome debugger

How to make a machine trust a self-signed Java application

How to add class active on specific li on user click with jQuery

When to use pthread_exit() and when to use pthread_join() in Linux?

Install Visual Studio 2013 on Windows 7

Chrome blocks different origin requests

JDBC connection failed, error: TCP/IP connection to host failed

How to allow http content within an iframe on a https site

XAMPP, Apache - Error: Apache shutdown unexpectedly

Why am I suddenly getting a "Blocked loading mixed active content" issue in Firefox?

Reading and writing to serial port in C on Linux

XAMPP - MySQL shutdown unexpectedly

Why is Node.js single threaded?

Apache is not running from XAMPP Control Panel ( Error: Apache shutdown unexpectedly. This may be due to a blocked port)

The transaction log for the database is full

What exactly is the function of Application.CutCopyMode property in Excel

Apache shutdown unexpectedly

Sites not accepting wget user agent header

How to pass IEnumerable list to controller in MVC including checkbox state?

JDBC connection to MSSQL server in windows authentication mode

Run local java applet in browser (chrome/firefox) "Your security settings have blocked a local application from running"

Java Error: "Your security settings have blocked a local application from running"

How to check a channel is closed or not without reading it?

Jquery UI datepicker. Disable array of Dates