Programs & Examples On #Digital

System has not been booted with systemd as init system (PID 1). Can't operate

This worked for me (using WSL)

sudo /etc/init.d/redis start

(for any other service, check the init.d folder for filenames)

How to solve "sign_and_send_pubkey: signing failed: agent refused operation"?

Run the below command to resolve this issue.

It worked for me.

chmod 600 ~/.ssh/id_rsa

Why is "npm install" really slow?

I was able to resolve this from the comments section; outlining the process below.

From the comments

AndreFigueiredo stated :

I installed modules here in less than 1 min with your package.json with npm v3.5.2 and node v4.2.6. I suggest you update node and npm.


v1.3.0 didn't even have flattened dependencies introduced on v3 that resolved a lot of annoying issues

LINKIWI stated :

Generally speaking, don't rely on package managers like apt to maintain up-to-date software. I would strongly recommend purging the node/npm combo you installed from apt and following the instructions on nodejs.org to install the latest release.

Observations

Following their advice, I noticed that CentOS, Ubuntu, and Debian all use very outdated versions of nodejs and npm when retrieving the current version using apt or yum (depending on operating systems primary package manager).

Get rid of the outdated nodejs and npm

To resolve this with as minimal headache as possible, I ran the following command (on Ubuntu) :

apt-get purge --auto-remove nodejs npm

This purged the system of the archaic nodejs and npm as well as all dependencies which were no longer required

Install current nodejs and compatible npm

The next objective was to get a current version of both nodejs and npm which I can snag nodejs directly from here and either compile or use the binary, however this would not make it easy to swap versions as I need to (depending on age of project).

I came across a great package called nvm which (so far) seems to manage this task quite well. To install the current stable latest build of version 7 of nodejs :

Install nvm

curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.0/install.sh | bash

Source .bashrc

source ~/.bashrc

Use nvm to install nodejs 7.x

nvm install 7

After installation I was pleasantly surprised by much faster performance of npm, that it also now showed a pretty progress bar while snagging packages.

For those curious, the current (as of this date) version of npm should look like the following (and if it doesn't, you likely need to update it):

current npm running

Summary

DO NOT USE YOUR OS PACKAGE MANAGER TO INSTALL NODE.JS OR NPM - You will get very bad results as it seems no OS is keeping these packages (not even close to) current. If you find that npm is running slow and it isn't your computer or internet, it is most likely because of a severely outdated version.

Invalid http_host header

In your project settings.py file,set ALLOWED_HOSTS like this :

ALLOWED_HOSTS = ['62.63.141.41', 'namjoosadr.com']

and then restart your apache. in ubuntu:

/etc/init.d/apache2 restart

gpg failed to sign the data fatal: failed to write commit object [Git 2.10.0]

Follow the below url to setup signed commit https://help.github.com/en/articles/telling-git-about-your-signing-key

if still getting gpg failed to sign the data fatal: failed to write commit object

this is not issue with git ,this is with GPG follow below steps

1.gpg --version

  1. echo "test" | gpg --clearsign

if it is showing:

gpg: signing failed: Inappropriate ioctl for device
gpg: [stdin]: clear-sign failed: Inappropriate ioctl for device
  1. then use export GPG_TTY=$(tty)

4.then again try echo "test" | gpg --clearsign in which PGP signature is got.

  1. git config -l | grep gpg

gpg.program=gpg commit.gpgsign=true

6.apply git commit -S -m "commitMsz"

Verify host key with pysftp

I've implemented auto_add_key in my pysftp github fork.

auto_add_key will add the key to known_hosts if auto_add_key=True
Once a key is present for a host in known_hosts this key will be checked.

Please reffer Martin Prikryl -> answer about security concerns.

Though for an absolute security, you should not retrieve the host key remotely, as you cannot be sure, if you are not being attacked already.

import pysftp as sftp

def push_file_to_server():
    s = sftp.Connection(host='138.99.99.129', username='root', password='pass', auto_add_key=True)
    local_path = "testme.txt"
    remote_path = "/home/testme.txt"

    s.put(local_path, remote_path)
    s.close()

push_file_to_server()

Note: Why using context manager

import pysftp
with pysftp.Connection(host, username="whatever", password="whatever", auto_add_key=True) as sftp:
    #do your stuff here
#connection closed

403 Access Denied on Tomcat 8 Manager App without prompting for user/password

  1. Go and Check if a user is created or not if no please create a user by opening a file in /apache-tomcat-9.0.20/tomcat-users.xml add a line into it

    <user username="tomcat" password="tomcat" roles="admin-gui,manager-gui,manager-script" />

  2. Goto /apache-tomcat-9.0.20/webapps/manager/META-INF/ open context.xml comment everything in context tag example:

<Context antiResourceLocking="false" privileged="true" >
     <!--Valve className="org.apache.catalina.valves.RemoteAddrValve"
            allow="127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" /-->
   </Context>

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'demoRestController'

Your DemoApplication class is in the com.ag.digital.demo.boot package and your LoginBean class is in the com.ag.digital.demo.bean package. By default components (classes annotated with @Component) are found if they are in the same package or a sub-package of your main application class DemoApplication. This means that LoginBean isn't being found so dependency injection fails.

There are a couple of ways to solve your problem:

  1. Move LoginBean into com.ag.digital.demo.boot or a sub-package.
  2. Configure the packages that are scanned for components using the scanBasePackages attribute of @SpringBootApplication that should be on DemoApplication.

A few of other things that aren't causing a problem, but are not quite right with the code you've posted:

  • @Service is a specialisation of @Component so you don't need both on LoginBean
  • Similarly, @RestController is a specialisation of @Component so you don't need both on DemoRestController
  • DemoRestController is an unusual place for @EnableAutoConfiguration. That annotation is typically found on your main application class (DemoApplication) either directly or via @SpringBootApplication which is a combination of @ComponentScan, @Configuration, and @EnableAutoConfiguration.

How to resolve the "EVP_DecryptFInal_ex: bad decrypt" during file decryption

I experienced a similar error reply while using the openssl command line interface, while having the correct binary key (-K). The option "-nopad" resolved the issue:

Example generating the error:

echo -ne "\x32\xc8\xde\x5c\x68\x19\x7e\x53\xa5\x75\xe1\x76\x1d\x20\x16\xb2\x72\xd8\x40\x87\x25\xb3\x71\x21\x89\xf6\xca\x46\x9f\xd0\x0d\x08\x65\x49\x23\x30\x1f\xe0\x38\x48\x70\xdb\x3b\xa8\x56\xb5\x4a\xc6\x09\x9e\x6c\x31\xce\x60\xee\xa2\x58\x72\xf6\xb5\x74\xa8\x9d\x0c" | openssl aes-128-cbc -d -K 31323334353637383930313233343536 -iv 79169625096006022424242424242424 | od -t x1

Result:

bad decrypt
140181876450560:error:06065064:digital envelope 
routines:EVP_DecryptFinal_ex:bad decrypt:../crypto/evp/evp_enc.c:535:
0000000 2f 2f 07 02 54 0b 00 00 00 00 00 00 04 29 00 00
0000020 00 00 04 a9 ff 01 00 00 00 00 04 a9 ff 02 00 00
0000040 00 00 04 a9 ff 03 00 00 00 00 0d 79 0a 30 36 38

Example with correct result:

echo -ne "\x32\xc8\xde\x5c\x68\x19\x7e\x53\xa5\x75\xe1\x76\x1d\x20\x16\xb2\x72\xd8\x40\x87\x25\xb3\x71\x21\x89\xf6\xca\x46\x9f\xd0\x0d\x08\x65\x49\x23\x30\x1f\xe0\x38\x48\x70\xdb\x3b\xa8\x56\xb5\x4a\xc6\x09\x9e\x6c\x31\xce\x60\xee\xa2\x58\x72\xf6\xb5\x74\xa8\x9d\x0c" | openssl aes-128-cbc -d -K 31323334353637383930313233343536 -iv 79169625096006022424242424242424 -nopad | od -t x1

Result:

0000000 2f 2f 07 02 54 0b 00 00 00 00 00 00 04 29 00 00
0000020 00 00 04 a9 ff 01 00 00 00 00 04 a9 ff 02 00 00
0000040 00 00 04 a9 ff 03 00 00 00 00 0d 79 0a 30 36 38
0000060 30 30 30 34 31 33 31 2f 2f 2f 2f 2f 2f 2f 2f 2f
0000100

Bootstrap - How to add a logo to navbar class?

Enter the image and give height:100%;width:auto then just change the height of navbar itself to resize image. There is a really good example in codepen. https://codepen.io/bootstrapped/pen/KwYGwq

How to configure Docker port mapping to use Nginx as an upstream proxy?

@gdbj's answer is a great explanation and the most up to date answer. Here's however a simpler approach.

So if you want to redirect all traffic from nginx listening to 80 to another container exposing 8080, minimum configuration can be as little as:

nginx.conf:

server {
    listen 80;

    location / {
        proxy_pass http://client:8080; # this one here
        proxy_redirect off;
    }

}

docker-compose.yml

version: "2"
services:
  entrypoint:
    image: some-image-with-nginx
    ports:
      - "80:80"
    links:
      - client  # will use this one here

  client:
    image: some-image-with-api
    ports:
      - "8080:8080"

Docker docs

Nginx serves .php files as downloads, instead of executing them

My solution was to add

    location ~ \.php$ {
    try_files $uri =404;
    fastcgi_split_path_info ^(.+\.php)(/.+)$;
    fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    fastcgi_index index.php;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    include fastcgi_params;

to my custom configuration file, for example etc/nginx/sites-available/example.com.conf

Adding to /etc/nginx/sites-available/default didn't work for me.

json: cannot unmarshal object into Go value of type

Determining of root cause is not an issue since Go 1.8; field name now is shown in the error message:

json: cannot unmarshal object into Go struct field Comment.author of type string

create a trusted self-signed SSL cert for localhost (for use with Express/Node)

Mkcert from @FiloSottile makes this process infinitely simpler:

  1. Install mkcert, there are instructions for macOS/Windows/Linux
  2. mkcert -install to create a local CA
  3. mkcert localhost 127.0.0.1 ::1 to create a trusted cert for localhost in the current directory
  4. You're using node (which doesn't use the system root store), so you need to specify the CA explicitly in an environment variable, e.g: export NODE_EXTRA_CA_CERTS="$(mkcert -CAROOT)/rootCA.pem"
  5. Finally run your express server using the setup described in various other answers (e.g. below)
  6. boom. localhost's swimming in green.

Basic node setup:

const https = require('https');
const fs = require('fs');
const express = require('express');

const app = express();    
const server = https.createServer({
    key: fs.readFileSync('/XXX/localhost+2-key.pem'), // where's me key?
    cert: fs.readFileSync('/XXX/localhost+2.pem'), // where's me cert?
    requestCert: false,
    rejectUnauthorized: false,
}, app).listen(10443); // get creative

JS Client-Side Exif Orientation: Rotate and Mirror JPEG Images

The github project JavaScript-Load-Image provides a complete solution to the EXIF orientation problem, correctly rotating/mirroring images for all 8 exif orientations. See the online demo of javascript exif orientation

The image is drawn onto an HTML5 canvas. Its correct rendering is implemented in js/load-image-orientation.js through canvas operations.

Hope this saves somebody else some time, and teaches the search engines about this open source gem :)

How does `scp` differ from `rsync`?

Difference b/w scp and rsync on different parameter

1. Performance over latency

  • scp : scp is relatively less optimise and speed

  • rsync : rsync is comparatively more optimise and speed

https://www.disk91.com/2014/technology/networks/compare-performance-of-different-file-transfer-protocol-over-latency/

2. Interruption handling

  • scp : scp command line tool cannot resume aborted downloads from lost network connections

  • rsync : If the above rsync session itself gets interrupted, you can resume it as many time as you want by typing the same command. rsync will automatically restart the transfer where it left off.

http://ask.xmodulo.com/resume-large-scp-file-transfer-linux.html

3. Command Example

scp

$ scp source_file_path destination_file_path

rsync

$ cd /path/to/directory/of/partially_downloaded_file
$ rsync -P --rsh=ssh [email protected]:bigdata.tgz ./bigdata.tgz 

The -P option is the same as --partial --progress, allowing rsync to work with partially downloaded files. The --rsh=ssh option tells rsync to use ssh as a remote shell.

4. Security :

scp is more secure. You have to use rsync --rsh=ssh to make it as secure as scp.

man document to know more :

performance chart

avrdude: stk500v2_ReceiveMessage(): timeout

To my humble understanding this error arises with different scenarios

  1. you have selected the wrong port or you haven't at all. go to tools>ports ans select the com port with your Arduino connected to
  2. you have selected the wrong board. go to tools>board and look for the right board
  3. you have one of these arduino's replicas or you don't have the boot-loader installed on the micro-controller. I don't know the solution to this! if you know please edit my post and add the instructions.
  4. (windows only) you don't have the right drivers installed. you need to update them manually.
  5. sometimes when you have wires connected to the board this happens. you need to separate the board from any breadboard or wires you have installed and try uploading again. It seems pins 0 (RX) and 1 (TX), which can be used for serial communication, are problematic and better to be free while uploading the code.

  6. Sometimes it happens randomly for no specific reasons!

There are all kind of solutions all over the internet, sometimes hard to tell the difference with magic! Maybe Arduino team should think of better compiler errors helping users differentiate between these different causes.

The same problem happened to me and none of the solutions above worked. What happened was that I was using an Arduino uno and everything was fine, but when I bough an Arduino Mega 2560, no matter what sketch I tried to upload I got the error:

avrdude: stk500v2_ReceiveMessage(): timeout

And it was just on one of my windows computers and the other one was just ok out of the box.

Solution:

What solved my problem was to go to tools>boards>Boards Manager... and then on top left of the opened windows select "updatable" in "Type" section. Then select the items in the list and press update on right.

I'm not sure if this will solve everyone problem, but it at least solved mine.

Nginx 403 error: directory index of [folder] is forbidden

Because you're using php-fpm, you should make sure that php-fpm user is the same as nginx user.

Check /etc/php-fpm.d/www.conf and set php user and group to nginx if it's not.

The php-fpm user needs write permission.

How do you get AngularJS to bind to the title attribute of an A tag?

The search query model lives in the scope defined by the ng-controller="whatever" directive. So if you want to bind the query model to <title>, you have to move the ngController declaration to an HTML element that is a common parent to both the body and title elements:

<html ng-app="phonecatApp" ng-controller="PhoneListCtrl">

Ref: https://docs.angularjs.org/tutorial/step_03

How to make a input field readonly with JavaScript?

The above answers did not work for me. The below does: document.getElementById("input_field_id").setAttribute("readonly", true);

And to remove the readonly attribute: document.getElementById("input_field_id").removeAttribute("readonly");

And for running when the page is loaded, it is worth referring to here.

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.

How to parse XML to R data frame

Here's a partial solution using xml2. Breaking the solution up into smaller pieces generally makes it easier to ensure everything is lined up:

library(xml2)
data <- read_xml("http://forecast.weather.gov/MapClick.php?lat=29.803&lon=-82.411&FcstType=digitalDWML")

# Point locations
point <- data %>% xml_find_all("//point")
point %>% xml_attr("latitude") %>% as.numeric()
point %>% xml_attr("longitude") %>% as.numeric()

# Start time
data %>% 
  xml_find_all("//start-valid-time") %>% 
  xml_text()

# Temperature
data %>% 
  xml_find_all("//temperature[@type='hourly']/value") %>% 
  xml_text() %>% 
  as.integer()

How should we manage jdk8 stream for null values

Although the answers are 100% correct, a small suggestion to improve null case handling of the list itself with Optional:

 List<String> listOfStuffFiltered = Optional.ofNullable(listOfStuff)
                .orElseGet(Collections::emptyList)
                .stream()
                .filter(Objects::nonNull)
                .collect(Collectors.toList());

The part Optional.ofNullable(listOfStuff).orElseGet(Collections::emptyList) will allow you to handle nicely the case when listOfStuff is null and return an emptyList instead of failing with NullPointerException.

Have a fixed position div that needs to scroll if content overflows

The solutions here didn't work for me as I'm styling react components.

What worked though for the sidebar was

.sidebar{
position: sticky;
top: 0;
}

Hope this helps someone.

java.io.IOException: Broken pipe

The most common reason I've had for a "broken pipe" is that one machine (of a pair communicating via socket) has shut down its end of the socket before communication was complete. About half of those were because the program communicating on that socket had terminated.

If the program sending bytes sends them out and immediately shuts down the socket or terminates itself, it is possible for the socket to cease functioning before the bytes have been transmitted and read.

Try putting pauses anywhere you are shutting down the socket and before you allow the program to terminate to see if that helps.

FYI: "pipe" and "socket" are terms that get used interchangeably sometimes.

Conditional logic in AngularJS template

Angular 1.1.5 introduced the ng-if directive. That's the best solution for this particular problem. If you are using an older version of Angular, consider using angular-ui's ui-if directive.

If you arrived here looking for answers to the general question of "conditional logic in templates" also consider:


Original answer:

Here is a not-so-great "ng-if" directive:

myApp.directive('ngIf', function() {
    return {
        link: function(scope, element, attrs) {
            if(scope.$eval(attrs.ngIf)) {
                // remove '<div ng-if...></div>'
                element.replaceWith(element.children())
            } else {
                element.replaceWith(' ')
            }
        }
    }
});

that allows for this HTML syntax:

<div ng-repeat="message in data.messages" ng-class="message.type">
   <hr>
   <div ng-if="showFrom(message)">
       <div>From: {{message.from.name}}</div>
   </div>    
   <div ng-if="showCreatedBy(message)">
      <div>Created by: {{message.createdBy.name}}</div>
   </div>    
   <div ng-if="showTo(message)">
      <div>To: {{message.to.name}}</div>
   </div>    
</div>

Fiddle.

replaceWith() is used to remove unneeded content from the DOM.

Also, as I mentioned on Google+, ng-style can probably be used to conditionally load background images, should you want to use ng-show instead of a custom directive. (For the benefit of other readers, Jon stated on Google+: "both methods use ng-show which I'm trying to avoid because it uses display:none and leaves extra markup in the DOM. This is a particular problem in this scenario because the hidden element will have a background image which will still be loaded in most browsers.").
See also How do I conditionally apply CSS styles in AngularJS?

The angular-ui ui-if directive watches for changes to the if condition/expression. Mine doesn't. So, while my simple implementation will update the view correctly if the model changes such that it only affects the template output, it won't update the view correctly if the condition/expression answer changes.

E.g., if the value of a from.name changes in the model, the view will update. But if you delete $scope.data.messages[0].from, the from name will be removed from the view, but the template will not be removed from the view because the if-condition/expression is not being watched.

BeautifulSoup: extract text from anchor tag

print(link_addres.contents[0])

It will print the context of the anchor tags

example:

 statement_title = statement.find('h2',class_='briefing-statement__title')
 statement_title_text = statement_title.a.contents[0]

Phone mask with jQuery and Masked Input Plugin

Try this - http://jsfiddle.net/dKRGE/3/

$("#phone").mask("(99) 9999?9-9999");

$("#phone").on("blur", function() {
    var last = $(this).val().substr( $(this).val().indexOf("-") + 1 );

    if( last.length == 3 ) {
        var move = $(this).val().substr( $(this).val().indexOf("-") - 1, 1 );
        var lastfour = move + last;
        var first = $(this).val().substr( 0, 9 );

        $(this).val( first + '-' + lastfour );
    }
});

OpenSSL Verify return code: 20 (unable to get local issuer certificate)

I had the same problem on OSX OpenSSL 1.0.1i from Macports, and also had to specify CApath as a workaround (and as mentioned in the Ubuntu bug report, even an invalid CApath will make openssl look in the default directory). Interestingly, connecting to the same server using PHP's openssl functions (as used in PHPMailer 5) worked fine.

java.lang.RuntimeException: Unable to start activity ComponentInfo

I had the same issue, I cleaned and rebuilt the project and it worked.

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

I have found out when running a PS1 file for a Mapped drive to Dropbox that I'm always getting this error. When opening up properties for the PS1 there is no "Unblock".

The only thing that work for me is

powershell.exe -executionpolicy bypass -file .\Script.ps1

How to convert int to string on Arduino?

Here below is a self composed myitoa() which is by far smaller in code, and reserves a FIXED array of 7 (including terminating 0) in char *mystring, which is often desirable. It is obvious that one can build the code with character-shift instead, if one need a variable-length output-string.

void myitoa(int number, char *mystring) {
  boolean negative = number>0;

  mystring[0] = number<0? '-' : '+';
  number = number<0 ? -number : number;
  for (int n=5; n>0; n--) {
     mystring[n] = ' ';
     if(number > 0) mystring[n] = number%10 + 48;
     number /= 10;
  }  
  mystring[6]=0;
}

JavaScript Number Split into individual digits

I used this simple way of doing it.

To split digits

var N = 69;
var arr = N.toString().split('').map(Number)
// outputs [6,9]
console.log( arr ); 

To add them together

console.log(arr.reduce( (a,b) => a+b )); // 15

Rename multiple files by replacing a particular pattern in the filenames using a shell script

You can try this:

for file in *.jpg;
do
  mv $file $somestring_${file:((-7))}
done

You can see "parameter expansion" in man bash to understand the above better.

ACCESS_FINE_LOCATION AndroidManifest Permissions Not Being Granted

Compatible with all SDK versions (android.permission.ACCESS_FINE_LOCATION became dangerous permission in Android M and requires user to manually grant it).

In Android versions below Android M ContextCompat.checkSelfPermission(...) always returns true if you add these permission(s) in AndroidManifest.xml)

public void onSomeButtonClick() {
    ...
    if (!permissionsGranted()) {
        ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.ACCESS_FINE_LOCATION}, 123);
    } else doLocationAccessRelatedJob();
    ...
}

private Boolean permissionsGranted() {
    return ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED);
}

@Override
public void onRequestPermissionsResult(final int requestCode, @NonNull final String[] permissions, @NonNull final int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (requestCode == 123) {
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            // Permission granted.
            doLocationAccessRelatedJob();
        } else {
            // User refused to grant permission. You can add AlertDialog here
            Toast.makeText(this, "You didn't give permission to access device location", Toast.LENGTH_LONG).show();
            startInstalledAppDetailsActivity();
        }
    }
}

private void startInstalledAppDetailsActivity() {
    Intent i = new Intent();
    i.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
    i.addCategory(Intent.CATEGORY_DEFAULT);
    i.setData(Uri.parse("package:" + getPackageName()));
    i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(i);
}

in AndroidManifest.xml:

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

Posting array from form

Why are you sending it through a post if you already have it on the server (PHP) side?

Why not just save the array to the $_SESSION variable so you can use it when the form gets submitted, that might make it more "secure" since then the client cannot change the variables by editing the source.

It will depend upon how you really want to do.

How can I center <ul> <li> into div

This is a better way to center UL's inside of any DIV container.

This CSS solution does not use Width and Float properties. Float:Left and Width: 70%, will cause you headaches when you need to duplicate your menu on different pages with different menu items.

Instead of using width, we use padding and margin to determine the space around the text/menu item. Also, instead of using Float:Left in the LI element, use display:inline-block.

By floating your LI left, you literally float your content to the left and then you must use one of the Hacks mentioned above to center your UL. Display:inline-block creates your Float property for you (sort of). It takes your LI element and turns it into a block element that lays side by side each other (not floating).

With Responsive design and using frameworks like Bootstrap or Foundation, there will be issues when trying to float and center content. They have some built-in classes, but it's always better to do it from scratch. This solution is much better for dynamic menus (Such as Adobe Business Catalyst menu system).

Reference for this tutorial can be found at: http://html-tuts.com/center-div-image-table-ul-inside-div/

HTML

<div class="container">
        <ul>
            <li><a href="#">Button</a></li>
            <li><a href="#">Button</a></li>
            <li><a href="#">Button</a></li>
            <li><a href="#">Button</a></li>
            <li><a href="#">Button</a></li>
        </ul>
    </div>

CSS

.container {
    text-align: center;
    border: 1px solid green;
}
.container ul {
    border: 2px solid red;
    display: inline-block;
    margin: 10px 0;
    padding: 2px;
}
.container li {
    display: inline-block;
}
.container li a {
    display: inline-block;
    background: #444;
    color: #FFF;
    padding: 5px;
    text-decoration: none;
}

How to implement a SQL like 'LIKE' operator in java?

You could turn '%string%' to contains(), 'string%' to startsWith() and '%string"' to endsWith().

You should also run toLowerCase() on both the string and pattern as LIKE is case-insenstive.

Not sure how you'd handle '%string%other%' except with a Regular Expression though.

If you're using Regular Expressions:

Digital Certificate: How to import .cer file in to .truststore file using?

# Copy the certificate into the directory Java_home\Jre\Lib\Security
# Change your directory to Java_home\Jre\Lib\Security>
# Import the certificate to a trust store.

keytool -import -alias ca -file somecert.cer -keystore cacerts -storepass changeit [Return]

Trust this certificate: [Yes]

changeit is the default truststore password

Language Books/Tutorials for popular languages

Let's not forget Head First Java, which could be considered the essential first step in this language or maybe the step after the online tutorials by Sun. It's great for the purpose of grasping the language concisely, while adding a bit of fun, serving as a stepping stone for the more in-depth books already mentioned.

Sedgewick offers great series on Algorithms which are a must-have if you find Knuth's books to be too in-depth. Knuth aside, Sedgewick brings a solid approach to the field and he offers his books in C, C++ and Java. The C++ books could be used backwardly on C since he doesn't make a very large distinction between the two languages in his presentation.

Whenever I'm working on C, C:A Reference Manual, by Harbison and Steele, goes with me everywhere. It's concise and efficient while being extremely thorough making it priceless(to me anyways).

Languages aside, and if this thread is to become a go-to for references in which I think it's heading that way due to the number of solid contributions, please include Mastering Regular Expressions, for reasons I think most of us are aware of... some would also say that regex can be considered a language in its own right. Further, its usefulness in a wide array of languages makes it invaluable.

jquery disable form submit on enter

You can do this perfectly in pure Javascript, simple and no library required. Here it is my detailed answer for a similar topic: Disabling enter key for form

In short, here is the code:

<script type="text/javascript">
window.addEventListener('keydown',function(e){if(e.keyIdentifier=='U+000A'||e.keyIdentifier=='Enter'||e.keyCode==13){if(e.target.nodeName=='INPUT'&&e.target.type=='text'){e.preventDefault();return false;}}},true);
</script>

This code is to prevent "Enter" key for input type='text' only. (Because the visitor might need to hit enter across the page) If you want to disable "Enter" for other actions as well, you can add console.log(e); for your your test purposes, and hit F12 in chrome, go to "console" tab and hit "backspace" on the page and look inside it to see what values are returned, then you can target all of those parameters to further enhance the code above to suit your needs for "e.target.nodeName", "e.target.type" and many more...

Should I set max pool size in database connection string? What happens if I don't?

We can define maximum pool size in following way:

                <pool> 
               <min-pool-size>5</min-pool-size>
                <max-pool-size>200</max-pool-size>
                <prefill>true</prefill>
                <use-strict-min>true</use-strict-min>
                <flush-strategy>IdleConnections</flush-strategy>
                </pool>

Two versions of python on linux. how to make 2.7 the default

Add /usr/local/bin to your PATH environment variable, earlier in the list than /usr/bin.

Generally this is done in your shell's rc file, e.g. for bash, you'd put this in .bashrc:

export PATH="/usr/local/bin:$PATH"

This will cause your shell to look first for a python in /usr/local/bin, before it goes with the one in /usr/bin.

(Of course, this means you also need to have /usr/local/bin/python point to python2.7 - if it doesn't already, you'll need to symlink it.)

Broadcast Receiver within a Service

as your service is already setup, simply add a broadcast receiver in your service:

private final BroadcastReceiver receiver = new BroadcastReceiver() {
   @Override
   public void onReceive(Context context, Intent intent) {
      String action = intent.getAction();
      if(action.equals("android.provider.Telephony.SMS_RECEIVED")){
        //action for sms received
      }
      else if(action.equals(android.telephony.TelephonyManager.ACTION_PHONE_STATE_CHANGED)){
           //action for phone state changed
      }     
   }
};

in your service's onCreate do this:

IntentFilter filter = new IntentFilter();
filter.addAction("android.provider.Telephony.SMS_RECEIVED");
filter.addAction(android.telephony.TelephonyManager.ACTION_PHONE_STATE_CHANGED);
filter.addAction("your_action_strings"); //further more
filter.addAction("your_action_strings"); //further more

registerReceiver(receiver, filter);

and in your service's onDestroy:

unregisterReceiver(receiver);

and you are good to go to receive broadcast for what ever filters you mention in onCreate. Make sure to add any permission if required. for e.g.

<uses-permission android:name="android.permission.RECEIVE_SMS" />

How to set $_GET variable

You can use GET variables in the action parameter of your form element. Example:

<form method="post" action="script.php?foo=bar">
    <input name="quu" ... />
    ...
</form>

This will give you foo as a GET variable and quu as a POST variable.

Send JSON data from Javascript to PHP?

This is a summary of the main solutions with easy-to-reproduce code:

Method 1 (application/json or text/plain + JSON.stringify)

var data = {foo: 'blah "!"', bar: 123};
var xhr = new XMLHttpRequest();
xhr.open("POST", "test.php");
xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { console.log(xhr.responseText); } }
xhr.setRequestHeader("Content-type", "application/json") // or "text/plain"
xhr.send(JSON.stringify(data)); 

PHP side, you can get the data with:

print_r(json_decode(file_get_contents('php://input'), true));

Method 2 (x-www-form-urlencoded + JSON.stringify)

var data = {foo: 'blah "!"', bar: 123};
var xhr = new XMLHttpRequest();
xhr.open("POST", "test.php");
xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { console.log(xhr.responseText); } }
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.send("json=" + encodeURIComponent(JSON.stringify(data))); 

Note: encodeURIComponent(...) is needed for example if the JSON contains & character.

PHP side, you can get the data with:

print_r(json_decode($_POST['json'], true));

Method 3 (x-www-form-urlencoded + URLSearchParams)

var data = {foo: 'blah "!"', bar: 123};
var xhr = new XMLHttpRequest();
xhr.open("POST", "test.php");
xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { console.log(xhr.responseText); } }
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.send(new URLSearchParams(data).toString()); 

PHP side, you can get the data with:

print_r($_POST);

Note: https://caniuse.com/#search=URLSearchParams

java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex in Android Studio 3.0

Enable Multidex through build.gradle of your app module

multiDexEnabled true

Same as below -

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.xx.xxx"
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        multiDexEnabled true //Add this
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            shrinkResources true
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

Then follow below steps -

  1. From the Build menu -> press the Clean Project button.
  2. When task completed, press the Rebuild Project button from the Build menu.
  3. From menu File -> Invalidate cashes / Restart

compile is now deprecated so it's better to use implementation or api

How to get all of the immediate subdirectories in Python

I just wrote some code to move vmware virtual machines around, and ended up using os.path and shutil to accomplish file copying between sub-directories.

def copy_client_files (file_src, file_dst):
    for file in os.listdir(file_src):
            print "Copying file: %s" % file
            shutil.copy(os.path.join(file_src, file), os.path.join(file_dst, file))

It's not terribly elegant, but it does work.

TypeError: object of type 'int' has no len() error assistance needed

Abstract:

The reason why you are getting this error message is because you are trying to call a method on an int type of a variable. This would work if would have called len() function on a list type of a variable. Let's examin the two cases:

Fail:

num = 10

print(len(num))

The above will produce an error similar to yours due to calling len() function on an int type of a variable;

Success:

data = [0, 4, 8, 9, 12]

print(len(data))

The above will work since you are calling a function on a list type of a variable;

Set disable attribute based on a condition for Html.TextBoxFor

I like the extension method approach so you don't have to pass through all possible parameters.
However using Regular expressions can be quite tricky (and somewhat slower) so I used XDocument instead:

public static MvcHtmlString SetDisabled(this MvcHtmlString html, bool isDisabled)
{
    var xDocument = XDocument.Parse(html.ToHtmlString());
    if (!(xDocument.FirstNode is XElement element))
    {
        return html;
    }

    element.SetAttributeValue("disabled", isDisabled ? "disabled" : null);
    return MvcHtmlString.Create(element.ToString());
}

Use the extension method like this:
@Html.EditorFor(m => m.MyProperty).SetDisabled(Model.ExpireDate == null)

How to print in C

printf is a fair bit more complicated than that. You have to supply a format string, and then the variables to apply to the format string. If you just supply one variable, C will assume that is the format string and try to print out all the bytes it finds in it until it hits a terminating nul (0x0).

So if you just give it an integer, it will merrily march through memory at the location your integer is stored, dumping whatever garbage is there to the screen, until it happens to come across a byte containing 0.

For a Java programmer, I'd imagine this is a rather rude introduction to C's lack of type checking. Believe me, this is only the tip of the iceberg. This is why, while I applaud your desire to expand your horizons by learning C, I highly suggest you do whatever you can to avoid writing real programs in it.

(This goes for everyone else reading this too.)

How to query nested objects?

db.messages.find( { headers : { From: "[email protected]" } } )

This queries for documents where headers equals { From: ... }, i.e. contains no other fields.


db.messages.find( { 'headers.From': "[email protected]" } )

This only looks at the headers.From field, not affected by other fields contained in, or missing from, headers.


Dot-notation docs

convert a list of objects from one type to another using lambda expression

var target = origList.ConvertAll(x => (TargetType)x);

Update one MySQL table with values from another

It depends what is a use of those tables, but you might consider putting trigger on original table on insert and update. When insert or update is done, update the second table based on only one item from the original table. It will be quicker.

MySql Error: Can't update table in stored function/trigger because it is already used by statement which invoked this stored function/trigger

I have the same problem and fix by add "new." before the field is updated. And I post full trigger here for someone to want to write a trigger

DELIMITER $$

USE `nc`$$

CREATE
    TRIGGER `nhachung_province_count_update` BEFORE UPDATE ON `nhachung` 
    FOR EACH ROW BEGIN

    DECLARE slug_province VARCHAR(128);
    DECLARE slug_district VARCHAR(128);

    IF old.status!=new.status THEN  /* neu doi status */
        IF new.status="Y" THEN
            UPDATE province SET `count`=`count`+1 WHERE id = new.district_id;
        ELSE 
            UPDATE province SET `count`=`count`-1 WHERE id = new.district_id;
        END IF;
    ELSEIF old.province_id!=new.province_id THEN /* neu doi province_id + district_id */

        UPDATE province SET `count`=`count`+1 WHERE id = new.province_id; /* province_id */
        UPDATE province SET `count`=`count`-1 WHERE id = old.province_id;
        UPDATE province SET `count`=`count`+1 WHERE id = new.district_id; /* district_id */
        UPDATE province SET `count`=`count`-1 WHERE id = old.district_id;

        SET slug_province = ( SELECT slug FROM province WHERE id= new.province_id LIMIT 0,1 );
        SET slug_district = ( SELECT slug FROM province WHERE id= new.district_id LIMIT 0,1 );
        SET new.prov_dist_url=CONCAT(slug_province, "/", slug_district);

    ELSEIF old.district_id!=new.district_id THEN 

        UPDATE province SET `count`=`count`+1 WHERE id = new.district_id;
        UPDATE province SET `count`=`count`-1 WHERE id = old.district_id;

        SET slug_province = ( SELECT slug FROM province WHERE id= new.province_id LIMIT 0,1 );
        SET slug_district = ( SELECT slug FROM province WHERE id= new.district_id LIMIT 0,1 );
        SET new.prov_dist_url=CONCAT(slug_province, "/", slug_district);

    END IF;


    END;
$$

DELIMITER ;

Hope this help someone

Get input value from TextField in iOS alert in Swift

In Swift5 ans Xcode 10

Add two textfields with Save and Cancel actions and read TextFields text data

func alertWithTF() {
    //Step : 1
    let alert = UIAlertController(title: "Great Title", message: "Please input something", preferredStyle: UIAlertController.Style.alert )
    //Step : 2
    let save = UIAlertAction(title: "Save", style: .default) { (alertAction) in
        let textField = alert.textFields![0] as UITextField
        let textField2 = alert.textFields![1] as UITextField
        if textField.text != "" {
            //Read TextFields text data
            print(textField.text!)
            print("TF 1 : \(textField.text!)")
        } else {
            print("TF 1 is Empty...")
        }

        if textField2.text != "" {
            print(textField2.text!)
            print("TF 2 : \(textField2.text!)")
        } else {
            print("TF 2 is Empty...")
        }
    }

    //Step : 3
    //For first TF
    alert.addTextField { (textField) in
        textField.placeholder = "Enter your first name"
        textField.textColor = .red
    }
    //For second TF
    alert.addTextField { (textField) in
        textField.placeholder = "Enter your last name"
        textField.textColor = .blue
    }

    //Step : 4
    alert.addAction(save)
    //Cancel action
    let cancel = UIAlertAction(title: "Cancel", style: .default) { (alertAction) in }
    alert.addAction(cancel)
    //OR single line action
    //alert.addAction(UIAlertAction(title: "Cancel", style: .default) { (alertAction) in })

    self.present(alert, animated:true, completion: nil)

}

For more explanation https://medium.com/@chan.henryk/alert-controller-with-text-field-in-swift-3-bda7ac06026c

`React/RCTBridgeModule.h` file not found

I've encountered this issue while upgrading from 0.58.4 to new react-native version 0.60.4. Nothing from what i found on the internet helped me, but I managed to get it working:

Go to build settings, search for 'Header search paths', select the entry, press DELETE button.

I had these values overriden, and looks like they fell back to defaults after deletion. Also Cocoapods was complaining about it with messages in Terminal after pod install:

[!] The `app [Release]` target overrides the `HEADER_SEARCH_PATHS` build setting defined in `Pods/Target Support Files/Pods-app/Pods-app.release.xcconfig'. This can lead to problems with the CocoaPods installation

Does Python have a ternary conditional operator?

As already answered, yes there is a ternary operator in python:

<expression 1> if <condition> else <expression 2>

Additional information:

If <expression 1> is the condition you can use Short-cirquit evaluation:

a = True
b = False

# Instead of this:
x = a if a else b

# You could use Short-cirquit evaluation:
x = a or b

PS: Of course, a Short-cirquit evaluation is not a ternary operator but often the ternary is used in cases where the short circuit would be enough.

Changing three.js background to transparent or other color

For transparency, this is also mandatory: renderer = new THREE.WebGLRenderer( { alpha: true } ) via Transparent background with three.js

Simple int to char[] conversion

main()
{
  int i = 247593;
  char str[10];

  sprintf(str, "%d", i);
// Now str contains the integer as characters
}

Hope it will be helpful to you.

php get values from json encode

json_decode will return the same array that was originally encoded. For instanse, if you

$array = json_decode($json, true);
echo $array['countryId'];

OR

$obj= json_decode($json);

echo $obj->countryId;

These both will echo 84. I think json_encode and json_decode function names are self-explanatory...

How can you test if an object has a specific property?

Just to clarify given the following object

$Object

With the following properties

type        : message
user        : [email protected]
text        : 
ts          : 11/21/2016 8:59:30 PM

The following are true

$Object.text -eq $NULL
$Object.NotPresent -eq $NULL

-not $Object.text
-not $Object.NotPresent

So the earlier answers that explicitly check for the property by name is the most correct way to verify that that property is not present.

Use Expect in a Bash script to provide a password to an SSH command

Use the helper tool fd0ssh (from hxtools, not pmt). It works without having to expect a particular prompt from the ssh program.

How to initialize log4j properly?

While setting up log4j properly is great for "real" projects you might want a quick-and-dirty solution, e.g. if you're just testing a new library.

If so a call to the static method

org.apache.log4j.BasicConfigurator.configure();

will setup basic logging to the console, and the error messages will be gone.

AccessDenied for ListObjects for S3 bucket when permissions are s3:*

I'm adding an answer with the same direction as the accepted answer but with small (important) differences and adding more details.

Consider the configuration below:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": ["s3:ListBucket"],
      "Resource": ["arn:aws:s3:::<Bucket-Name>"]
    },
    {
      "Effect": "Allow",
      "Action": [
        "s3:PutObject",
        "s3:DeleteObject"
      ],
      "Resource": ["arn:aws:s3:::<Bucket-Name>/*"]
    }
  ]
}

The policy grants programmatic write-delete access and is separated into two parts:
The ListBucket action provides permissions on the bucket level and the other PutObject/DeleteObject actions require permissions on the objects inside the bucket.

The first Resource element specifies arn:aws:s3:::<Bucket-Name> for the ListBucket action so that applications can list all objects in the bucket.

The second Resource element specifies arn:aws:s3:::<Bucket-Name>/* for the PutObject, and DeletObject actions so that applications can write or delete any objects in the bucket.

The separation into two different 'arns' is important from security reasons in order to specify bucket-level and object-level fine grained permissions.

Notice that if I would have specified just GetObject in the 2nd block what would happen is that in cases of programmatic access I would receive an error like:

Upload failed: <file-name> to <bucket-name>:<path-in-bucket> An error occurred (AccessDenied) when calling the PutObject operation: Access Denied.

Converting String to Int with Swift

Swift 3.0

Try this, you don't need to check for any condition I have done everything just use this function. Send anything string, number, float, double ,etc,. you get a number as a value or 0 if it is unable to convert your value

Function:

func getNumber(number: Any?) -> NSNumber {
    guard let statusNumber:NSNumber = number as? NSNumber else
    {
        guard let statString:String = number as? String else
        {
            return 0
        }
        if let myInteger = Int(statString)
        {
            return NSNumber(value:myInteger)
        }
        else{
            return 0
        }
    }
    return statusNumber
}

Usage: Add the above function in code and to convert use let myNumber = getNumber(number: myString) if the myString has a number or string it returns the number else it returns 0

Example 1:

let number:String = "9834"
print("printing number \(getNumber(number: number))")

Output: printing number 9834

Example 2:

let number:Double = 9834
print("printing number \(getNumber(number: number))")

Output: printing number 9834

Example 3:

let number = 9834
print("printing number \(getNumber(number: number))")

Output: printing number 9834

uint8_t vs unsigned char

It documents your intent - you will be storing small numbers, rather than a character.

Also it looks nicer if you're using other typedefs such as uint16_t or int32_t.

HTML input time in 24 format

Tested!

In Windows -> control panel -> Region -> Additional Settings -> Time -> Short Time:

Format your time as HH:mm

in the format

hh = 12 hours

HH = 24 hours

mm = minutes

tt = AM or PM

so to get the required result the format should be HH:mm and not hh:mm tt

How to enable scrolling on website that disabled scrolling?

adding overflow:visible !important; to the body element worked for me.

UITableView load more when scrolling to bottom like Facebook application

let threshold = 100.0 // threshold from bottom of tableView
var isLoadingMore = false // flag


func scrollViewDidScroll(scrollView: UIScrollView) {
    let contentOffset = scrollView.contentOffset.y
    let maximumOffset = scrollView.contentSize.height - scrollView.frame.size.height;

    if !isLoadingMore && (maximumOffset - contentOffset <= threshold) {
        // Get more data - API call
        self.isLoadingMore = true

        // Update UI
        dispatch_async(dispatch_get_main_queue()) {
            tableView.reloadData()
            self.isLoadingMore = false
        }
    }
  }

importing jar libraries into android-studio

I see so many complicated answer.

All this confused me while I was adding my Aquery jar file in the new version of Android Studio.

This is what I did :

Copy pasted the jar file in the libs folder which is visible under Project view.

And in the build.gradle file just added this line : compile files('libs/android-query.jar')

PS : Once downloading the jar file please change its name. I changed the name to android-query.jar

Bootstrap - floating navbar button right

Create a separate ul.nav for just that list item and float that ul right.

jsFiddle

How to check if a string starts with "_" in PHP?

Since someone mentioned efficiency, I've benchmarked the functions given so far out of curiosity:

function startsWith1($str, $char) {
    return strpos($str, $char) === 0;
}
function startsWith2($str, $char) {
    return stripos($str, $char) === 0;
}
function startsWith3($str, $char) {
    return substr($str, 0, 1) === $char;
}
function startsWith4($str, $char){
    return $str[0] === $char;
}
function startsWith5($str, $char){
    return (bool) preg_match('/^' . $char . '/', $str);
}
function startsWith6($str, $char) {
    if (is_null($encoding)) $encoding = mb_internal_encoding();
    return mb_substr($str, 0, mb_strlen($char, $encoding), $encoding) === $char;
}

Here are the results on my average DualCore machine with 100.000 runs each

// Testing '_string'
startsWith1 took 0.385906934738
startsWith2 took 0.457293987274
startsWith3 took 0.412894964218
startsWith4 took 0.366240024567 <-- fastest
startsWith5 took 0.642996072769
startsWith6 took 1.39859509468

// Tested "string"
startsWith1 took 0.384965896606
startsWith2 took 0.445554971695
startsWith3 took 0.42377281189
startsWith4 took 0.373164176941 <-- fastest
startsWith5 took 0.630424022675
startsWith6 took 1.40699005127

// Tested 1000 char random string [a-z0-9]
startsWith1 took 0.430691003799
startsWith2 took 4.447286129
startsWith3 took 0.413349866867
startsWith4 took 0.368592977524 <-- fastest
startsWith5 took 0.627470016479
startsWith6 took 1.40957403183

// Tested 1000 char random string [a-z0-9] with '_' prefix
startsWith1 took 0.384054899216
startsWith2 took 4.41522812843
startsWith3 took 0.408898115158
startsWith4 took 0.363884925842 <-- fastest
startsWith5 took 0.638479948044
startsWith6 took 1.41304707527

As you can see, treating the haystack as array to find out the char at the first position is always the fastest solution. It is also always performing at equal speed, regardless of string length. Using strpos is faster than substr for short strings but slower for long strings, when the string does not start with the prefix. The difference is irrelevant though. stripos is incredibly slow with long strings. preg_match performs mostly the same regardless of string length, but is only mediocre in speed. The mb_substr solution performs worst, while probably being more reliable though.

Given that these numbers are for 100.000 runs, it should be obvious that we are talking about 0.0000x seconds per call. Picking one over the other for efficiency is a worthless micro-optimization, unless your app is doing startsWith checking for a living.

How to remove leading and trailing whitespace in a MySQL field?

I needed to trim the values in a primary key column that had first and last names, so I did not want to trim all white space as that would remove the space between the first and last name, which I needed to keep. What worked for me was...

UPDATE `TABLE` SET `FIELD`= TRIM(FIELD);

or

UPDATE 'TABLE' SET 'FIELD' = RTRIM(FIELD);

or

UPDATE 'TABLE' SET 'FIELD' = LTRIM(FIELD);

Note that the first instance of FIELD is in single quotes but the second is not in quotes at all. I had to do it this way or it gave me a syntax error saying it was a duplicate primary key when I had both in quotes.

Media query to detect if device is touchscreen

Media types do not allow you to detect touch capabilities as part of the standard:

http://www.w3.org/TR/css3-mediaqueries/

So, there is no way to do it consistently via CSS or media queries, you will have to resort to JavaScript.

No need to use Modernizr, you can just use plain JavaScript:

<script type="text/javascript">
    var is_touch_device = 'ontouchstart' in document.documentElement;
    if(is_touch_device) alert("touch is enabled!");
</script>

Is it possible to capture a Ctrl+C signal and run a cleanup function, in a "defer" fashion?

You can use the os/signal package to handle incoming signals. Ctrl+C is SIGINT, so you can use this to trap os.Interrupt.

c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func(){
    for sig := range c {
        // sig is a ^C, handle it
    }
}()

The manner in which you cause your program to terminate and print information is entirely up to you.

How to send a pdf file directly to the printer using JavaScript?

I think this Library of JavaScript might Help you:

It's called Print.js

First Include

<script src="print.js"></script>
<link rel="stylesheet" type="text/css" href="print.css">

It's basic usage is to call printJS() and just pass in a PDF document url: printJS('docs/PrintJS.pdf')

What I did was something like this, this will also show "Loading...." if PDF document is too large.

<button type="button" onclick="printJS({printable:'docs/xx_large_printjs.pdf', type:'pdf', showModal:true})">
    Print PDF with Message
</button>

However keep in mind that:

Firefox currently doesn't allow printing PDF documents using iframes. There is an open bug in Mozilla's website about this. When using Firefox, Print.js will open the PDF file into a new tab.

How to condense if/else into one line in Python?

There is the conditional expression:

a if cond else b

but this is an expression, not a statement.

In if statements, the if (or elif or else) can be written on the same line as the body of the block if the block is just one like:

if something: somefunc()
else: otherfunc()

but this is discouraged as a matter of formatting-style.

Strings in C, how to get subString

You can treat C strings like pointers. So when you declare:

char str[10];

str can be used as a pointer. So if you want to copy just a portion of the string you can use:

char str1[24] = "This is a simple string.";
char str2[6];
strncpy(str1 + 10, str2,6);

This will copy 6 characters from the str1 array into str2 starting at the 11th element.

SQL Server : check if variable is Empty or NULL for WHERE clause

WHERE p.[Type] = isnull(@SearchType, p.[Type])

PHP Multiple Checkbox Array

You need to use the square brackets notation to have values sent as an array:

<form method='post' id='userform' action='thisform.php'>
<tr>
    <td>Trouble Type</td>
    <td>
    <input type='checkbox' name='checkboxvar[]' value='Option One'>1<br>
    <input type='checkbox' name='checkboxvar[]' value='Option Two'>2<br>
    <input type='checkbox' name='checkboxvar[]' value='Option Three'>3
    </td>
</tr>
</table>
<input type='submit' class='buttons'>
</form>

Please note though, that only the values of only checked checkboxes will be sent.

Error: Cannot pull with rebase: You have unstaged changes

You can always do

git fetch && git merge --ff-only origin/master

and you will either get (a) no change if you have uncommitted changes that conflict with upstream changes or (b) the same effect as stash/pull/apply: a rebase to put you on the latest changes from HEAD and your uncommitted changes left as is.

How do I read a large csv file with pandas?

If you use pandas read large file into chunk and then yield row by row, here is what I have done

import pandas as pd

def chunck_generator(filename, header=False,chunk_size = 10 ** 5):
   for chunk in pd.read_csv(filename,delimiter=',', iterator=True, chunksize=chunk_size, parse_dates=[1] ): 
        yield (chunk)

def _generator( filename, header=False,chunk_size = 10 ** 5):
    chunk = chunck_generator(filename, header=False,chunk_size = 10 ** 5)
    for row in chunk:
        yield row

if __name__ == "__main__":
filename = r'file.csv'
        generator = generator(filename=filename)
        while True:
           print(next(generator))

Error inflating when extending a class

I had the same problem extending a TextEdit. For me the mistake was I did non add "public" to the constructor. In my case it works even if I define only one constructor, the one with arguments Context and AttributeSet. The wired thing is that the bug reveals itself only when I build an APK (singed or not) and I transfer it to the devices. When the application is run via AndroidStudio -> RunApp on a USB connected device the app works.

Unable to find velocity template resources

Make sure you have a properly configured resource loader. See Velocity documentation for help selecting and configuring a resource loader: http://velocity.apache.org/engine/releases/velocity-1.7/developer-guide.html#resourceloaders

INSTALL_FAILED_MISSING_SHARED_LIBRARY error in Android

I am developing an app to version 2.2, API version would in the 8th ... had the same error and the error told me it was to google maps API, all we did was change my ADV for my project API 2.2 and also for the API.

This worked for me and found the library API needed.

Convert string to title case with JavaScript

var toMatch = "john w. smith";
var result = toMatch.replace(/(\w)(\w*)/g, function (_, i, r) {
      return i.toUpperCase() + (r != null ? r : "");
    }
)

Seems to work... Tested with the above, "the quick-brown, fox? /jumps/ ^over^ the ¡lazy! dog..." and "C:/program files/some vendor/their 2nd application/a file1.txt".

If you want 2Nd instead of 2nd, you can change to /([a-z])(\w*)/g.

The first form can be simplified as:

function toTitleCase(toTransform) {
  return toTransform.replace(/\b([a-z])/g, function (_, initial) {
      return initial.toUpperCase();
  });
}

MS SQL 2008 - get all table names and their row counts in a DB

SELECT sc.name +'.'+ ta.name TableName
 ,SUM(pa.rows) RowCnt
 FROM sys.tables ta
 INNER JOIN sys.partitions pa
 ON pa.OBJECT_ID = ta.OBJECT_ID
 INNER JOIN sys.schemas sc
 ON ta.schema_id = sc.schema_id
 WHERE ta.is_ms_shipped = 0 AND pa.index_id IN (1,0)
 GROUP BY sc.name,ta.name
 ORDER BY SUM(pa.rows) DESC

See this:

HTML5 LocalStorage: Checking if a key exists

The MDN documentation shows how the getItem method is implementated:

Object.defineProperty(oStorage, "getItem", {
      value: function (sKey) { return sKey ? this[sKey] : null; },
      writable: false,
      configurable: false,
      enumerable: false
    });

If the value isn't set, it returns null. You are testing to see if it is undefined. Check to see if it is null instead.

if(localStorage.getItem("username") === null){

Counting the number of option tags in a select tag in jQuery

The best form is this

$('#example option').length

OS X Terminal Colors

If you want to have your ls colorized you have to edit your ~/.bash_profile file and add the following line (if not already written) :

source .bashrc

Then you edit or create ~/.bashrc file and write an alias to the ls command :

alias ls="ls -G"

Now you have to type source .bashrc in a terminal if already launched, or simply open a new terminal.

If you want more options in your ls juste read the manual ( man ls ). Options are not exactly the same as in a GNU/Linux system.

Django: Calling .update() on a single model instance retrieved by .get()?

if you want only to update model if exist (without create it):

Model.objects.filter(id = 223).update(field1 = 2)

mysql query:

UPDATE `model` SET `field1` = 2 WHERE `model`.`id` = 223

How to get the position of a character in Python?

Just for completion, in the case I want to find the extension in a file name in order to check it, I need to find the last '.', in this case use rfind:

path = 'toto.titi.tata..xls'
path.find('.')
4
path.rfind('.')
15

in my case, I use the following, which works whatever the complete file name is:

filename_without_extension = complete_name[:complete_name.rfind('.')]

How to check if a particular service is running on Ubuntu

I don't have an Ubuntu box, but on Red Hat Linux you can see all running services by running the following command:

service --status-all

On the list the + indicates the service is running, - indicates service is not running, ? indicates the service state cannot be determined.

Sample settings.xml

Here's the stock "settings.xml" with comments (complete/unchopped file at the bottom)

License:

<?xml version="1.0" encoding="UTF-8"?>

<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
-->

Main docs and top:

<!--
 | This is the configuration file for Maven. It can be specified at two levels:
 |
 |  1. User Level. This settings.xml file provides configuration for a single
 |                 user, and is normally provided in
 |                 ${user.home}/.m2/settings.xml.
 |
 |                 NOTE: This location can be overridden with the CLI option:
 |
 |                 -s /path/to/user/settings.xml
 |
 |  2. Global Level. This settings.xml file provides configuration for all
 |                 Maven users on a machine (assuming they're all using the
 |                 same Maven installation). It's normally provided in
 |                 ${maven.home}/conf/settings.xml.
 |
 |                 NOTE: This location can be overridden with the CLI option:
 |
 |                 -gs /path/to/global/settings.xml
 |
 | The sections in this sample file are intended to give you a running start
 | at getting the most out of your Maven installation. Where appropriate, the
 | default values (values used when the setting is not specified) are provided.
 |
 |-->
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">

Local repository, interactive mode, plugin groups:

  <!-- localRepository
   | The path to the local repository maven will use to store artifacts.
   |
   | Default: ~/.m2/repository
  <localRepository>/path/to/local/repo</localRepository>
  -->

  <!-- interactiveMode
   | This will determine whether maven prompts you when it needs input. If set
   | to false, maven will use a sensible default value, perhaps based on some
   | other setting, for the parameter in question.
   |
   | Default: true
  <interactiveMode>true</interactiveMode>
  -->

  <!-- offline
   | Determines whether maven should attempt to connect to the network when
   | executing a build. This will have an effect on artifact downloads,
   | artifact deployment, and others.
   |
   | Default: false
  <offline>false</offline>
  -->

  <!-- pluginGroups
   | This is a list of additional group identifiers that will be searched when
   | resolving plugins by their prefix, i.e. when invoking a command line like
   | "mvn prefix:goal". Maven will automatically add the group identifiers
   | "org.apache.maven.plugins" and "org.codehaus.mojo" if these are not
   | already contained in the list.
   |-->
  <pluginGroups>
    <!-- pluginGroup
     | Specifies a further group identifier to use for plugin lookup.
    <pluginGroup>com.your.plugins</pluginGroup>
    -->
  </pluginGroups>

Proxies:

  <!-- proxies
   | This is a list of proxies which can be used on this machine to connect to
   | the network. Unless otherwise specified (by system property or command-
   | line switch), the first proxy specification in this list marked as active
   | will be used.
   |-->
  <proxies>
    <!-- proxy
     | Specification for one proxy, to be used in connecting to the network.
     |
    <proxy>
      <id>optional</id>
      <active>true</active>
      <protocol>http</protocol>
      <username>proxyuser</username>
      <password>proxypass</password>
      <host>proxy.host.net</host>
      <port>80</port>
      <nonProxyHosts>local.net|some.host.com</nonProxyHosts>
    </proxy>
    -->
  </proxies>

Servers:

  <!-- servers
   | This is a list of authentication profiles, keyed by the server-id used
   | within the system. Authentication profiles can be used whenever maven must
   | make a connection to a remote server.
   |-->
  <servers>
    <!-- server
     | Specifies the authentication information to use when connecting to a
     | particular server, identified by a unique name within the system
     | (referred to by the 'id' attribute below).
     |
     | NOTE: You should either specify username/password OR
     |       privateKey/passphrase, since these pairings are used together.
     |
    <server>
      <id>deploymentRepo</id>
      <username>repouser</username>
      <password>repopwd</password>
    </server>
    -->

    <!-- Another sample, using keys to authenticate.
    <server>
      <id>siteServer</id>
      <privateKey>/path/to/private/key</privateKey>
      <passphrase>optional; leave empty if not used.</passphrase>
    </server>
    -->
  </servers>

Mirrors:

  <!-- mirrors
   | This is a list of mirrors to be used in downloading artifacts from remote
   | repositories.
   |
   | It works like this: a POM may declare a repository to use in resolving
   | certain artifacts. However, this repository may have problems with heavy
   | traffic at times, so people have mirrored it to several places.
   |
   | That repository definition will have a unique id, so we can create a
   | mirror reference for that repository, to be used as an alternate download
   | site. The mirror site will be the preferred server for that repository.
   |-->
  <mirrors>
    <!-- mirror
     | Specifies a repository mirror site to use instead of a given repository.
     | The repository that this mirror serves has an ID that matches the
     | mirrorOf element of this mirror. IDs are used for inheritance and direct
     | lookup purposes, and must be unique across the set of mirrors.
     |
    <mirror>
      <id>mirrorId</id>
      <mirrorOf>repositoryId</mirrorOf>
      <name>Human Readable Name for this Mirror.</name>
      <url>http://my.repository.com/repo/path</url>
    </mirror>
     -->
  </mirrors>

Profiles (1/3):

  <!-- profiles
   | This is a list of profiles which can be activated in a variety of ways,
   | and which can modify the build process. Profiles provided in the
   | settings.xml are intended to provide local machine-specific paths and
   | repository locations which allow the build to work in the local
   | environment.
   |
   | For example, if you have an integration testing plugin - like cactus -
   | that needs to know where your Tomcat instance is installed, you can
   | provide a variable here such that the variable is dereferenced during the
   | build process to configure the cactus plugin.
   |
   | As noted above, profiles can be activated in a variety of ways. One
   | way - the activeProfiles section of this document (settings.xml) - will be
   | discussed later. Another way essentially relies on the detection of a
   | system property, either matching a particular value for the property, or
   | merely testing its existence. Profiles can also be activated by JDK
   | version prefix, where a value of '1.4' might activate a profile when the
   | build is executed on a JDK version of '1.4.2_07'. Finally, the list of
   | active profiles can be specified directly from the command line.
   |
   | NOTE: For profiles defined in the settings.xml, you are restricted to
   |       specifying only artifact repositories, plugin repositories, and
   |       free-form properties to be used as configuration variables for
   |       plugins in the POM.
   |
   |-->

Profiles (2/3):

  <profiles>
    <!-- profile
     | Specifies a set of introductions to the build process, to be activated
     | using one or more of the mechanisms described above. For inheritance
     | purposes, and to activate profiles via <activatedProfiles/> or the
     | command line, profiles have to have an ID that is unique.
     |
     | An encouraged best practice for profile identification is to use a
     | consistent naming convention for profiles, such as 'env-dev',
     | 'env-test', 'env-production', 'user-jdcasey', 'user-brett', etc. This
     | will make it more intuitive to understand what the set of introduced
     | profiles is attempting to accomplish, particularly when you only have a
     | list of profile id's for debug.
     |
     | This profile example uses the JDK version to trigger activation, and
     | provides a JDK-specific repo.
    <profile>
      <id>jdk-1.4</id>

      <activation>
        <jdk>1.4</jdk>
      </activation>

      <repositories>
        <repository>
          <id>jdk14</id>
          <name>Repository for JDK 1.4 builds</name>
          <url>http://www.myhost.com/maven/jdk14</url>
          <layout>default</layout>
          <snapshotPolicy>always</snapshotPolicy>
        </repository>
      </repositories>
    </profile>
    -->

Profiles (3/3):

    <!--
     | Here is another profile, activated by the system property 'target-env'
     | with a value of 'dev', which provides a specific path to the Tomcat
     | instance. To use this, your plugin configuration might hypothetically
     | look like:
     |
     | ...
     | <plugin>
     |   <groupId>org.myco.myplugins</groupId>
     |   <artifactId>myplugin</artifactId>
     |
     |   <configuration>
     |     <tomcatLocation>${tomcatPath}</tomcatLocation>
     |   </configuration>
     | </plugin>
     | ...
     |
     | NOTE: If you just wanted to inject this configuration whenever someone
     |       set 'target-env' to anything, you could just leave off the
     |       <value/> inside the activation-property.
     |
    <profile>
      <id>env-dev</id>

      <activation>
        <property>
          <name>target-env</name>
          <value>dev</value>
        </property>
      </activation>

      <properties>
        <tomcatPath>/path/to/tomcat/instance</tomcatPath>
      </properties>
    </profile>
    -->
  </profiles>

Bottom:

  <!-- activeProfiles
   | List of profiles that are active for all builds.
   |
  <activeProfiles>
    <activeProfile>alwaysActiveProfile</activeProfile>
    <activeProfile>anotherAlwaysActiveProfile</activeProfile>
  </activeProfiles>
  -->
</settings>

Complete file:


<?xml version="1.0" encoding="UTF-8"?>

<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
-->

<!--
 | This is the configuration file for Maven. It can be specified at two levels:
 |
 |  1. User Level. This settings.xml file provides configuration for a single
 |                 user, and is normally provided in
 |                 ${user.home}/.m2/settings.xml.
 |
 |                 NOTE: This location can be overridden with the CLI option:
 |
 |                 -s /path/to/user/settings.xml
 |
 |  2. Global Level. This settings.xml file provides configuration for all
 |                 Maven users on a machine (assuming they're all using the
 |                 same Maven installation). It's normally provided in
 |                 ${maven.home}/conf/settings.xml.
 |
 |                 NOTE: This location can be overridden with the CLI option:
 |
 |                 -gs /path/to/global/settings.xml
 |
 | The sections in this sample file are intended to give you a running start
 | at getting the most out of your Maven installation. Where appropriate, the
 | default values (values used when the setting is not specified) are provided.
 |
 |-->
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">

  <!-- localRepository
   | The path to the local repository maven will use to store artifacts.
   |
   | Default: ~/.m2/repository
  <localRepository>/path/to/local/repo</localRepository>
  -->

  <!-- interactiveMode
   | This will determine whether maven prompts you when it needs input. If set
   | to false, maven will use a sensible default value, perhaps based on some
   | other setting, for the parameter in question.
   |
   | Default: true
  <interactiveMode>true</interactiveMode>
  -->

  <!-- offline
   | Determines whether maven should attempt to connect to the network when
   | executing a build. This will have an effect on artifact downloads,
   | artifact deployment, and others.
   |
   | Default: false
  <offline>false</offline>
  -->

  <!-- pluginGroups
   | This is a list of additional group identifiers that will be searched when
   | resolving plugins by their prefix, i.e. when invoking a command line like
   | "mvn prefix:goal". Maven will automatically add the group identifiers
   | "org.apache.maven.plugins" and "org.codehaus.mojo" if these are not
   | already contained in the list.
   |-->
  <pluginGroups>
    <!-- pluginGroup
     | Specifies a further group identifier to use for plugin lookup.
    <pluginGroup>com.your.plugins</pluginGroup>
    -->
  </pluginGroups>

  <!-- proxies
   | This is a list of proxies which can be used on this machine to connect to
   | the network. Unless otherwise specified (by system property or command-
   | line switch), the first proxy specification in this list marked as active
   | will be used.
   |-->
  <proxies>
    <!-- proxy
     | Specification for one proxy, to be used in connecting to the network.
     |
    <proxy>
      <id>optional</id>
      <active>true</active>
      <protocol>http</protocol>
      <username>proxyuser</username>
      <password>proxypass</password>
      <host>proxy.host.net</host>
      <port>80</port>
      <nonProxyHosts>local.net|some.host.com</nonProxyHosts>
    </proxy>
    -->
  </proxies>

  <!-- servers
   | This is a list of authentication profiles, keyed by the server-id used
   | within the system. Authentication profiles can be used whenever maven must
   | make a connection to a remote server.
   |-->
  <servers>
    <!-- server
     | Specifies the authentication information to use when connecting to a
     | particular server, identified by a unique name within the system
     | (referred to by the 'id' attribute below).
     |
     | NOTE: You should either specify username/password OR
     |       privateKey/passphrase, since these pairings are used together.
     |
    <server>
      <id>deploymentRepo</id>
      <username>repouser</username>
      <password>repopwd</password>
    </server>
    -->

    <!-- Another sample, using keys to authenticate.
    <server>
      <id>siteServer</id>
      <privateKey>/path/to/private/key</privateKey>
      <passphrase>optional; leave empty if not used.</passphrase>
    </server>
    -->
  </servers>

  <!-- mirrors
   | This is a list of mirrors to be used in downloading artifacts from remote
   | repositories.
   |
   | It works like this: a POM may declare a repository to use in resolving
   | certain artifacts. However, this repository may have problems with heavy
   | traffic at times, so people have mirrored it to several places.
   |
   | That repository definition will have a unique id, so we can create a
   | mirror reference for that repository, to be used as an alternate download
   | site. The mirror site will be the preferred server for that repository.
   |-->
  <mirrors>
    <!-- mirror
     | Specifies a repository mirror site to use instead of a given repository.
     | The repository that this mirror serves has an ID that matches the
     | mirrorOf element of this mirror. IDs are used for inheritance and direct
     | lookup purposes, and must be unique across the set of mirrors.
     |
    <mirror>
      <id>mirrorId</id>
      <mirrorOf>repositoryId</mirrorOf>
      <name>Human Readable Name for this Mirror.</name>
      <url>http://my.repository.com/repo/path</url>
    </mirror>
     -->
  </mirrors>

  <!-- profiles
   | This is a list of profiles which can be activated in a variety of ways,
   | and which can modify the build process. Profiles provided in the
   | settings.xml are intended to provide local machine-specific paths and
   | repository locations which allow the build to work in the local
   | environment.
   |
   | For example, if you have an integration testing plugin - like cactus -
   | that needs to know where your Tomcat instance is installed, you can
   | provide a variable here such that the variable is dereferenced during the
   | build process to configure the cactus plugin.
   |
   | As noted above, profiles can be activated in a variety of ways. One
   | way - the activeProfiles section of this document (settings.xml) - will be
   | discussed later. Another way essentially relies on the detection of a
   | system property, either matching a particular value for the property, or
   | merely testing its existence. Profiles can also be activated by JDK
   | version prefix, where a value of '1.4' might activate a profile when the
   | build is executed on a JDK version of '1.4.2_07'. Finally, the list of
   | active profiles can be specified directly from the command line.
   |
   | NOTE: For profiles defined in the settings.xml, you are restricted to
   |       specifying only artifact repositories, plugin repositories, and
   |       free-form properties to be used as configuration variables for
   |       plugins in the POM.
   |
   |-->

  <profiles>
    <!-- profile
     | Specifies a set of introductions to the build process, to be activated
     | using one or more of the mechanisms described above. For inheritance
     | purposes, and to activate profiles via <activatedProfiles/> or the
     | command line, profiles have to have an ID that is unique.
     |
     | An encouraged best practice for profile identification is to use a
     | consistent naming convention for profiles, such as 'env-dev',
     | 'env-test', 'env-production', 'user-jdcasey', 'user-brett', etc. This
     | will make it more intuitive to understand what the set of introduced
     | profiles is attempting to accomplish, particularly when you only have a
     | list of profile id's for debug.
     |
     | This profile example uses the JDK version to trigger activation, and
     | provides a JDK-specific repo.
    <profile>
      <id>jdk-1.4</id>

      <activation>
        <jdk>1.4</jdk>
      </activation>

      <repositories>
        <repository>
          <id>jdk14</id>
          <name>Repository for JDK 1.4 builds</name>
          <url>http://www.myhost.com/maven/jdk14</url>
          <layout>default</layout>
          <snapshotPolicy>always</snapshotPolicy>
        </repository>
      </repositories>
    </profile>
    -->

    <!--
     | Here is another profile, activated by the system property 'target-env'
     | with a value of 'dev', which provides a specific path to the Tomcat
     | instance. To use this, your plugin configuration might hypothetically
     | look like:
     |
     | ...
     | <plugin>
     |   <groupId>org.myco.myplugins</groupId>
     |   <artifactId>myplugin</artifactId>
     |
     |   <configuration>
     |     <tomcatLocation>${tomcatPath}</tomcatLocation>
     |   </configuration>
     | </plugin>
     | ...
     |
     | NOTE: If you just wanted to inject this configuration whenever someone
     |       set 'target-env' to anything, you could just leave off the
     |       <value/> inside the activation-property.
     |
    <profile>
      <id>env-dev</id>

      <activation>
        <property>
          <name>target-env</name>
          <value>dev</value>
        </property>
      </activation>

      <properties>
        <tomcatPath>/path/to/tomcat/instance</tomcatPath>
      </properties>
    </profile>
    -->
  </profiles>

  <!-- activeProfiles
   | List of profiles that are active for all builds.
   |
  <activeProfiles>
    <activeProfile>alwaysActiveProfile</activeProfile>
    <activeProfile>anotherAlwaysActiveProfile</activeProfile>
  </activeProfiles>
  -->
</settings>

Create a new workspace in Eclipse

I use File -> Switch Workspace -> Other... and type in my new workspace name.

New workspace composite screenshot (EDIT: Added the composite screen shot.)

Once in the new workspace, File -> Import... and under General choose "Existing Projects into Workspace. Press the Next button and then Browse for the old projects you would like to import. Check "Copy projects into workspace" to make a copy.

Python: BeautifulSoup - get an attribute value based on the name attribute

theharshest's answer is the best solution, but FYI the problem you were encountering has to do with the fact that a Tag object in Beautiful Soup acts like a Python dictionary. If you access tag['name'] on a tag that doesn't have a 'name' attribute, you'll get a KeyError.

Import and insert sql.gz file into database with putty

For an oneliner, on linux or cygwin, you need to do public key authentication on the host, otherwise ssh will be asking for password.


gunzip -c numbers.sql.gz | ssh user@host mysql --user=user_name --password=your_password db_name

Or do port forwarding and connect to the remote mysql using a "local" connection:

ssh -L some_port:host:local_mysql_port user@host

then do the mysql connection on your local machine to localhost:some_port.

The port forwarding will work from putty too, with the similar -L option or you can configure it from the settings panel, somewhere down on the tree.

How to stop EditText from gaining focus at Activity startup in Android

You have edit text and list. In OnStart/On Create, you should set focus on list view: Listview.requestfocus()

How to undo 'git reset'?

1.Use git reflog to get all references update.

2.git reset <id_of_commit_to_which_you_want_restore>

How to attach a process in gdb

The first argument should be the path to the executable program. So

gdb progname 12271

Unable to update the EntitySet - because it has a DefiningQuery and no <UpdateFunction> element exist

I was getting this issue because i was generating my EDMX from an existing database (designed by somebody else, and i use the term 'designed' loosely here).

Turns out the table had no keys whatsoever. EF was generating the model with many multiple keys. I had to go add a primary key to the db table in SQL and then updated my model in VS.

That fixed it for me.

MySQL integer field is returned as string in PHP

I like mastermind's technique, but the coding can be simpler:

function cast_query_results($result): array
{
    if ($result === false)
      return null;

    $data = array();
    $fields = $result->fetch_fields();
    while ($row = $result->fetch_assoc()) {
      foreach ($fields as $field) {
        $fieldName = $field->name;
        $fieldValue = $row[$fieldName];
        if (!is_null($fieldValue))
            switch ($field->type) {
              case 3:
                $row[$fieldName] = (int)$fieldValue;
                break;
              case 4:
                $row[$fieldName] = (float)$fieldValue;
                break;
              // Add other type conversions as desired.
              // Strings are already strings, so don't need to be touched.
            }
      }
      array_push($data, $row);
    }

    return $data;
}

I also added checking for query returning false rather than a result-set.
And checking for a row with a field that has a null value.
And if the desired type is a string, I don't waste any time on it - its already a string.


I don't bother using this in most php code; I just rely on php's automatic type conversion. But if querying a lot of data, to then perform arithmetic computations, it is sensible to cast to the optimal types up front.

How do I find my host and username on mysql?

The default username is root. You can reset the root password if you do not know it: http://dev.mysql.com/doc/refman/5.0/en/resetting-permissions.html. You should not, however, use the root account from PHP, set up a limited permission user to do that: http://dev.mysql.com/doc/refman/5.1/en/adding-users.html

If MySql is running on the same computer as your webserver, you can just use "localhost" as the host

Replace all occurrences of a String using StringBuilder?

Look at JavaDoc of replaceAll method of String class:

Replaces each substring of this string that matches the given regular expression with the given replacement. An invocation of this method of the form str.replaceAll(regex, repl) yields exactly the same result as the expression

java.util.regex.Pattern.compile(regex).matcher(str).replaceAll(repl)

As you can see you can use Pattern and Matcher to do that.

Update R using RStudio

Just restart R Studio after installing the new version of R. To confirm you're on the new version, >version and you should see the new details.

Adb Devices can't find my phone

I have a Samsung Galaxy and I had the same issue as you. Here's how to fix it:

In device manager on your Windows PC, even though it might say the USB drivers are installed correctly, there may exist corruption.

I went into device manager and uninstalled SAMSUNG Android USB Composite Device and made sure to check the box 'delete driver software'. Now the device will have an exclamation mark etc. I right clicked and installed the driver again (refresh copy). This finally made adb acknowledge my phone as an emulator.

As others noted, for Nexus 4, you can also try this fix.

IntelliJ Organize Imports

In addition to Optimize Imports and Auto Import, which were pointed out by @dave-newton and @ryan-stewart in earlier answers, go to:

  • IDEA <= 13: File menu > Settings > Code Style > Java > Imports
  • IDEA >= 14: File menu > Settings > Editor > Code Style > Java > Imports (thanks to @mathias-bader for the hint!) Settings dialog

There you can fine tune the grouping and order or imports, "Class count to use import with '*'", etc.

Note:
since IDEA 13 you can configure the project default settings from the IDEA "start page": Configure > Project defaults > Settings > .... Then every new project will have those default settings: enter image description here

Windows equivalent to UNIX pwd

hmm - pwd works for me on Vista...

Final EDIT: it works for me on Vista because WinAvr installed pwd.exe and added \Program Files\WinAvr\Utils\bin to my path.

Support for ES6 in Internet Explorer 11

The statement from Microsoft regarding the end of Internet Explorer 11 support mentions that it will continue to receive security updates, compatibility fixes, and technical support until its end of life. The wording of this statement leads me to believe that Microsoft has no plans to continue adding features to Internet Explorer 11, and instead will be focusing on Edge.

If you require ES6 features in Internet Explorer 11, check out a transpiler such as Babel.

R - " missing value where TRUE/FALSE needed "

check the command : NA!=NA : you'll get the result NA, hence the error message.

You have to use the function is.na for your ifstatement to work (in general, it is always better to use this function to check for NA values) :

comments = c("no","yes",NA)
for (l in 1:length(comments)) {
    if (!is.na(comments[l])) print(comments[l])
}
[1] "no"
[1] "yes"

Postgres: INSERT if does not exist already

Here is a generic python function that given a tablename, columns and values, generates the upsert equivalent for postgresql.

import json

def upsert(table_name, id_column, other_columns, values_hash):

    template = """
    WITH new_values ($$ALL_COLUMNS$$) as (
      values
         ($$VALUES_LIST$$)
    ),
    upsert as
    (
        update $$TABLE_NAME$$ m
            set
                $$SET_MAPPINGS$$
        FROM new_values nv
        WHERE m.$$ID_COLUMN$$ = nv.$$ID_COLUMN$$
        RETURNING m.*
    )
    INSERT INTO $$TABLE_NAME$$ ($$ALL_COLUMNS$$)
    SELECT $$ALL_COLUMNS$$
    FROM new_values
    WHERE NOT EXISTS (SELECT 1
                      FROM upsert up
                      WHERE up.$$ID_COLUMN$$ = new_values.$$ID_COLUMN$$)
    """

    all_columns = [id_column] + other_columns
    all_columns_csv = ",".join(all_columns)
    all_values_csv = ','.join([query_value(values_hash[column_name]) for column_name in all_columns])
    set_mappings = ",".join([ c+ " = nv." +c for c in other_columns])

    q = template
    q = q.replace("$$TABLE_NAME$$", table_name)
    q = q.replace("$$ID_COLUMN$$", id_column)
    q = q.replace("$$ALL_COLUMNS$$", all_columns_csv)
    q = q.replace("$$VALUES_LIST$$", all_values_csv)
    q = q.replace("$$SET_MAPPINGS$$", set_mappings)

    return q


def query_value(value):
    if value is None:
        return "NULL"
    if type(value) in [str, unicode]:
        return "'%s'" % value.replace("'", "''")
    if type(value) == dict:
        return "'%s'" % json.dumps(value).replace("'", "''")
    if type(value) == bool:
        return "%s" % value
    if type(value) == int:
        return "%s" % value
    return value


if __name__ == "__main__":

    my_table_name = 'mytable'
    my_id_column = 'id'
    my_other_columns = ['field1', 'field2']
    my_values_hash = {
        'id': 123,
        'field1': "john",
        'field2': "doe"
    }
    print upsert(my_table_name, my_id_column, my_other_columns, my_values_hash)

Javascript: open new page in same window

I'd take that a slightly different way if I were you. Change the text link when the page loads, not on the click. I'll give the example in jQuery, but it could easily be done in vanilla javascript (though, jQuery is nicer)

$(function() {
    $('a[href$="url="]')    // all links whose href ends in "url="
        .each(function(i, el) {
            this.href += escape(document.location.href);
        })
    ;
});

and write your HTML like this:

<a href="http://example.com/submit.php?url=">...</a>

the benefits of this are that people can see what they're clicking on (the href is already set), and it removes the javascript from your HTML.

All this said, it looks like you're using PHP... why not add it in server-side?

How to implement reCaptcha for ASP.NET MVC?

Simple and Complete Solution working for me. Supports ASP.NET MVC 4 and 5 (Supports ASP.NET 4.0, 4.5, and 4.5.1)

Step 1: Install NuGet Package by "Install-Package reCAPTCH.MVC"

Step 2: Add your Public and Private key to your web.config file in appsettings section

<appSettings>
    <add key="ReCaptchaPrivateKey" value=" -- PRIVATE_KEY -- " />
    <add key="ReCaptchaPublicKey" value=" -- PUBLIC KEY -- " />
</appSettings>  

You can create an API key pair for your site at https://www.google.com/recaptcha/intro/index.html and click on Get reCAPTCHA at top of the page

Step 3: Modify your form to include reCaptcha

@using reCAPTCHA.MVC
@using (Html.BeginForm())
{
    @Html.Recaptcha()
    @Html.ValidationMessage("ReCaptcha")
    <input type="submit" value="Register" />
}

Step 4: Implement the Controller Action that will handle the form submission and Captcha validation

[CaptchaValidator(
PrivateKey = "your private reCaptcha Google Key",
ErrorMessage = "Invalid input captcha.",
RequiredMessage = "The captcha field is required.")]
public ActionResult MyAction(myVM model)
{
    if (ModelState.IsValid) //this will take care of captcha
    {
    }
}

OR

public ActionResult MyAction(myVM model, bool captchaValid)
{
    if (captchaValid) //manually check for captchaValid 
    {
    }
}

Google API for location, based on user IP address

Here's a script that will use the Google API to acquire the users postal code and populate an input field.

function postalCodeLookup(input) {
    var head= document.getElementsByTagName('head')[0],
        script= document.createElement('script');
    script.src= '//maps.googleapis.com/maps/api/js?sensor=false';
    head.appendChild(script);
    script.onload = function() {
        if (navigator.geolocation) {
            var a = input,
                fallback = setTimeout(function () {
                    fail('10 seconds expired');
                }, 10000);

            navigator.geolocation.getCurrentPosition(function (pos) {
                clearTimeout(fallback);
                var point = new google.maps.LatLng(pos.coords.latitude, pos.coords.longitude);
                new google.maps.Geocoder().geocode({'latLng': point}, function (res, status) {
                    if (status == google.maps.GeocoderStatus.OK && typeof res[0] !== 'undefined') {
                        var zip = res[0].formatted_address.match(/,\s\w{2}\s(\d{5})/);
                        if (zip) {
                            a.value = zip[1];
                        } else fail('Unable to look-up postal code');
                    } else {
                        fail('Unable to look-up geolocation');
                    }
                });
            }, function (err) {
                fail(err.message);
            });
        } else {
            alert('Unable to find your location.');
        }
        function fail(err) {
            console.log('err', err);
            a.value('Try Again.');
        }
    };
}

You can adjust accordingly to acquire different information. For more info, check out the Google Maps API documentation.

new Date() is working in Chrome but not Firefox

I was having a similar issue in both Firefox and Safari when working with AngularJS. For example, if a date returned from Angular looked like this:

2014-06-02 10:28:00

using this code:

new Date('2014-06-02 10:28:00').toISOString();

returns an invalid date error in Firefox and Safari. However in Chrome it works fine. As another answer stated, Chrome is most likely just more flexible with parsing date strings.

My eventual goal was to format the date a certain way. I found an excellent library that handled both the cross browser compatibility issue and the date formatting issue. The library is called moment.js.

Using this library the following code works correctly across all browsers I tested:

moment('2014-06-02 10:28:00').format('MMM d YY')

If you are willing to include this extra library into your app you can more easily build your date string while avoiding possible browser compatibility issues. As a bonus you will have a good way to easily format, add, subtract, etc dates if needed.

How to fix homebrew permissions?

Firstly, with MacOS Catalina, the basic ways to change the ownership of /usr/local are no longer allowed. For example:

$ sudo chown -R "$USER":wheel /usr/local
Password:
chown: /usr/local: Operation not permitted
$ sudo chown -R "$USER" /usr/local
chown: /usr/local: Operation not permitted
$ sudo chown -R $(whoami) /usr/local
chown: /usr/local: Operation not permitted

Hence, the popular answers above cannot be used. Secondly, however, taking a step back, if the main concern is to install or upgrade Homebrew, rather than wanting to change the permissions for /usr/local per se, then it may be overkill (like taking a sledgehammer to hammer a nail) to change the permissions for /usr/local. It affects your whole machine and other software may also be using /usr/local. For example, I have files related to maven and mySQL in /usr/local.

A more precise solution is to follow the instructions to install Homebrew, given at the Homebrew GitHub site, namely

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

which installs Homebrew inside /usr/local without changing ownership of /usr/local itself. Instead, Cellar, Caskroom, Frameworks, Homebrew, etc. are installed inside /usr/local. This seems to be a more elegant, precise solution in my opinion.

How to extract URL parameters from a URL with Ruby or Rails?

I think you want to turn any given URL string into a HASH?

You can try http://www.ruby-doc.org/stdlib/libdoc/cgi/rdoc/classes/CGI.html#M000075

require 'cgi'

CGI::parse('param1=value1&param2=value2&param3=value3')

returns

{"param1"=>["value1"], "param2"=>["value2"], "param3"=>["value3"]}

How to draw a line in android

Simple one

 <TextView
    android:layout_width="match_parent"
    android:layout_height="1dp"
    android:background="#c0c0c0"
    android:id="@+id/your_id"
    android:layout_marginTop="160dp" />

How can I create a self-signed cert for localhost?

If you are using Visual Studio, there is an easy way to setup and enable SSL using IIS Express explained here

Difference between a class and a module

namespace: modules are namespaces...which don't exist in java ;)

I also switched from Java and python to Ruby, I remember had exactly this same question...

So the simplest answer is that module is a namespace, which doesn't exist in Java. In java the closest mindset to namespace is a package.

So a module in ruby is like what in java:
class? No
interface? No
abstract class? No
package? Yes (maybe)

static methods inside classes in java: same as methods inside modules in ruby

In java the minimum unit is a class, you can't have a function outside of a class. However in ruby this is possible (like python).

So what goes into a module?
classes, methods, constants. Module protects them under that namespace.

No instance: modules can't be used to create instances

Mixed ins: sometimes inheritance models are not good for classes, but in terms of functionality want to group a set of classes/ methods/ constants together

Rules about modules in ruby:
- Module names are UpperCamelCase
- constants within modules are ALL CAPS (this rule is the same for all ruby constants, not specific to modules)
- access methods: use . operator
- access constants: use :: symbol

simple example of a module:

module MySampleModule
  CONST1 = "some constant"

  def self.method_one(arg1)
    arg1 + 2
  end
end

how to use methods inside a module:

puts MySampleModule.method_one(1) # prints: 3

how to use constants of a module:

puts MySampleModule::CONST1 # prints: some constant

Some other conventions about modules:
Use one module in a file (like ruby classes, one class per ruby file)

Checking for an empty field with MySQL

You could use

IFNULL(email, '') > ''

Validating an XML against referenced XSD in C#

The following example validates an XML file and generates the appropriate error or warning.

using System;
using System.IO;
using System.Xml;
using System.Xml.Schema;

public class Sample
{

    public static void Main()
    {
        //Load the XmlSchemaSet.
        XmlSchemaSet schemaSet = new XmlSchemaSet();
        schemaSet.Add("urn:bookstore-schema", "books.xsd");

        //Validate the file using the schema stored in the schema set.
        //Any elements belonging to the namespace "urn:cd-schema" generate
        //a warning because there is no schema matching that namespace.
        Validate("store.xml", schemaSet);
        Console.ReadLine();
    }

    private static void Validate(String filename, XmlSchemaSet schemaSet)
    {
        Console.WriteLine();
        Console.WriteLine("\r\nValidating XML file {0}...", filename.ToString());

        XmlSchema compiledSchema = null;

        foreach (XmlSchema schema in schemaSet.Schemas())
        {
            compiledSchema = schema;
        }

        XmlReaderSettings settings = new XmlReaderSettings();
        settings.Schemas.Add(compiledSchema);
        settings.ValidationEventHandler += new ValidationEventHandler(ValidationCallBack);
        settings.ValidationType = ValidationType.Schema;

        //Create the schema validating reader.
        XmlReader vreader = XmlReader.Create(filename, settings);

        while (vreader.Read()) { }

        //Close the reader.
        vreader.Close();
    }

    //Display any warnings or errors.
    private static void ValidationCallBack(object sender, ValidationEventArgs args)
    {
        if (args.Severity == XmlSeverityType.Warning)
            Console.WriteLine("\tWarning: Matching schema not found.  No validation occurred." + args.Message);
        else
            Console.WriteLine("\tValidation error: " + args.Message);

    }
}

The preceding example uses the following input files.

<?xml version='1.0'?>
<bookstore xmlns="urn:bookstore-schema" xmlns:cd="urn:cd-schema">
  <book genre="novel">
    <title>The Confidence Man</title>
    <price>11.99</price>
  </book>
  <cd:cd>
    <title>Americana</title>
    <cd:artist>Offspring</cd:artist>
    <price>16.95</price>
  </cd:cd>
</bookstore>

books.xsd

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns="urn:bookstore-schema"
    elementFormDefault="qualified"
    targetNamespace="urn:bookstore-schema">

 <xsd:element name="bookstore" type="bookstoreType"/>

 <xsd:complexType name="bookstoreType">
  <xsd:sequence maxOccurs="unbounded">
   <xsd:element name="book"  type="bookType"/>
  </xsd:sequence>
 </xsd:complexType>

 <xsd:complexType name="bookType">
  <xsd:sequence>
   <xsd:element name="title" type="xsd:string"/>
   <xsd:element name="author" type="authorName"/>
   <xsd:element name="price"  type="xsd:decimal"/>
  </xsd:sequence>
  <xsd:attribute name="genre" type="xsd:string"/>
 </xsd:complexType>

 <xsd:complexType name="authorName">
  <xsd:sequence>
   <xsd:element name="first-name"  type="xsd:string"/>
   <xsd:element name="last-name" type="xsd:string"/>
  </xsd:sequence>
 </xsd:complexType>

</xsd:schema>

malloc an array of struct pointers

There's a lot of typedef going on here. Personally I'm against "hiding the asterisk", i.e. typedef:ing pointer types into something that doesn't look like a pointer. In C, pointers are quite important and really affect the code, there's a lot of difference between foo and foo *.

Many of the answers are also confused about this, I think.

Your allocation of an array of Chess values, which are pointers to values of type chess (again, a very confusing nomenclature that I really can't recommend) should be like this:

Chess *array = malloc(n * sizeof *array);

Then, you need to initialize the actual instances, by looping:

for(i = 0; i < n; ++i)
  array[i] = NULL;

This assumes you don't want to allocate any memory for the instances, you just want an array of pointers with all pointers initially pointing at nothing.

If you wanted to allocate space, the simplest form would be:

for(i = 0; i < n; ++i)
  array[i] = malloc(sizeof *array[i]);

See how the sizeof usage is 100% consistent, and never starts to mention explicit types. Use the type information inherent in your variables, and let the compiler worry about which type is which. Don't repeat yourself.

Of course, the above does a needlessly large amount of calls to malloc(); depending on usage patterns it might be possible to do all of the above with just one call to malloc(), after computing the total size needed. Then you'd still need to go through and initialize the array[i] pointers to point into the large block, of course.

Remove characters from a string

ONELINER which remove characters LIST (more than one at once) - for example remove +,-, ,(,) from telephone number:

var str = "+(48) 123-456-789".replace(/[-+()\s]/g, '');  // result: "48123456789"

We use regular expression [-+()\s] where we put unwanted characters between [ and ]

(the "\s" is 'space' character escape - for more info google 'character escapes in in regexp')

Accessing a class' member variables in Python?

You are declaring a local variable, not a class variable. To set an instance variable (attribute), use

class Example(object):
    def the_example(self):
        self.itsProblem = "problem"  # <-- remember the 'self.'

theExample = Example()
theExample.the_example()
print(theExample.itsProblem)

To set a class variable (a.k.a. static member), use

class Example(object):
    def the_example(self):
        Example.itsProblem = "problem"
        # or, type(self).itsProblem = "problem"
        # depending what you want to do when the class is derived.

Getting the first character of a string with $str[0]

It'll vary depending on resources, but you could run the script bellow and see for yourself ;)

<?php
$tests = 100000;

for ($i = 0; $i < $tests; $i++)
{
    $string = md5(rand());
    $position = rand(0, 31);

    $start1 = microtime(true);
    $char1 = $string[$position];
    $end1 = microtime(true);
    $time1[$i] = $end1 - $start1;

    $start2 = microtime(true);
    $char2 = substr($string, $position, 1);
    $end2 = microtime(true);
    $time2[$i] = $end2 - $start2;

    $start3 = microtime(true);
    $char3 = $string{$position};
    $end3 = microtime(true);
    $time3[$i] = $end3 - $start3;
}

$avg1 = array_sum($time1) / $tests;
echo 'the average float microtime using "array[]" is '. $avg1 . PHP_EOL;

$avg2 = array_sum($time2) / $tests;
echo 'the average float microtime using "substr()" is '. $avg2 . PHP_EOL;

$avg3 = array_sum($time3) / $tests;
echo 'the average float microtime using "array{}" is '. $avg3 . PHP_EOL;
?>

Some reference numbers (on an old CoreDuo machine)

$ php 1.php 
the average float microtime using "array[]" is 1.914701461792E-6
the average float microtime using "substr()" is 2.2536706924438E-6
the average float microtime using "array{}" is 1.821768283844E-6

$ php 1.php 
the average float microtime using "array[]" is 1.7251944541931E-6
the average float microtime using "substr()" is 2.0931363105774E-6
the average float microtime using "array{}" is 1.7225742340088E-6

$ php 1.php 
the average float microtime using "array[]" is 1.7293763160706E-6
the average float microtime using "substr()" is 2.1037721633911E-6
the average float microtime using "array{}" is 1.7249774932861E-6

It seems that using the [] or {} operators is more or less the same.

How to implement linear interpolation?

import scipy.interpolate
y_interp = scipy.interpolate.interp1d(x, y)
print y_interp(5.0)

scipy.interpolate.interp1d does linear interpolation by and can be customized to handle error conditions.

How to run vbs as administrator from vbs?

This is the universal and best solution for this:

If WScript.Arguments.Count <> 1 Then WScript.Quit 1
RunAsAdmin
Main

Sub RunAsAdmin()
    Set Shell = CreateObject("WScript.Shell")
    Set Env = Shell.Environment("VOLATILE")
    If Shell.Run("%ComSpec% /C ""NET FILE""", 0, True) <> 0 Then
        Env("CurrentDirectory") = Shell.CurrentDirectory
        ArgsList = ""
        For i = 1 To WScript.Arguments.Count
            ArgsList = ArgsList & """ """ & WScript.Arguments(i - 1)
        Next
        CreateObject("Shell.Application").ShellExecute WScript.FullName, """" & WScript.ScriptFullName & ArgsList & """", , "runas", 5
        WScript.Sleep 100
        Env.Remove("CurrentDirectory")
        WScript.Quit
    End If
    If Env("CurrentDirectory") <> "" Then Shell.CurrentDirectory = Env("CurrentDirectory")
End Sub

Sub Main()
    'Your code here!
End Sub

Advantages:

1) The parameter injection is not possible.
2) The number of arguments does not change after the elevation to administrator and then you can check them before you elevate yourself.
3) You know for real and immediately if the script runs as an administrator. For example, if you call it from a control panel uninstallation entry, the RunAsAdmin function will not run unnecessarily because in that case you are already an administrator. Same thing if you call it from a script already elevated to administrator.
4) The window is kept at its current size and position, as it should be.
5) The current directory doesn't change after obtained administrative privileges.

Disadvantages: Nobody

C# Debug - cannot start debugging because the debug target is missing

I had the same problems. I had to change file rights. Unmark "read only" in their properties.

Allow only numeric value in textbox using Javascript

Please note that, you should allow "system" key as well

    $(element).keydown(function (e) {
    var code = (e.keyCode ? e.keyCode : e.which), value;
    if (isSysKey(code) || code === 8 || code === 46) {
        return true;
    }

    if (e.shiftKey || e.altKey || e.ctrlKey) {
        return ;
    }

    if (code >= 48 && code <= 57) {
        return true;
    }

    if (code >= 96 && code <= 105) {
        return true;
    }

    return false;
});

function isSysKey(code) {
    if (code === 40 || code === 38 ||
            code === 13 || code === 39 || code === 27 ||
            code === 35 ||
            code === 36 || code === 37 || code === 38 ||
            code === 16 || code === 17 || code === 18 ||
            code === 20 || code === 37 || code === 9 ||
            (code >= 112 && code <= 123)) {
        return true;
    }

    return false;
}

How to write a multiline Jinja statement

According to the documentation: https://jinja.palletsprojects.com/en/2.10.x/templates/#line-statements you may use multi-line statements as long as the code has parens/brackets around it. Example:

{% if ( (foo == 'foo' or bar == 'bar') and 
        (fooo == 'fooo' or baar == 'baar') ) %}
    <li>some text</li>
{% endif %}

Edit: Using line_statement_prefix = '#'* the code would look like this:

# if ( (foo == 'foo' or bar == 'bar') and 
       (fooo == 'fooo' or baar == 'baar') )
    <li>some text</li>
# endif

*Here's an example of how you'd specify the line_statement_prefix in the Environment:

from jinja2 import Environment, PackageLoader, select_autoescape
env = Environment(
    loader=PackageLoader('yourapplication', 'templates'),
    autoescape=select_autoescape(['html', 'xml']),
    line_statement_prefix='#'
)

Or using Flask:

from flask import Flask
app = Flask(__name__, instance_relative_config=True, static_folder='static')
app.jinja_env.filters['zip'] = zip
app.jinja_env.line_statement_prefix = '#'

Convert a dataframe to a vector (by rows)

You can try as.vector(t(test)). Please note that, if you want to do it by columns you should use unlist(test).

How do I test if a string is empty in Objective-C?

if(str.length == 0 || [str isKindOfClass: [NSNull class]]){
    NSLog(@"String is empty");
}
else{
    NSLog(@"String is not empty");
}    

Uploading Files in ASP.net without using the FileUpload server control

The Request.Files collection contains any files uploaded with your form, regardless of whether they came from a FileUpload control or a manually written <input type="file">.

So you can just write a plain old file input tag in the middle of your WebForm, and then read the file uploaded from the Request.Files collection.

How can I use goto in Javascript?

Actually, I see that ECMAScript (JavaScript) DOES INDEED have a goto statement. However, the JavaScript goto has two flavors!

The two JavaScript flavors of goto are called labeled continue and labeled break. There is no keyword "goto" in JavaScript. The goto is accomplished in JavaScript using the break and continue keywords.

And this is more or less explicitly stated on the w3schools website here http://www.w3schools.com/js/js_switch.asp.

I find the documentation of the labeled continue and labeled break somewhat awkwardly expressed.

The difference between the labeled continue and labeled break is where they may be used. The labeled continue can only be used inside a while loop. See w3schools for some more information.

===========

Another approach that will work is to have a giant while statement with a giant switch statement inside:

while (true)
{
    switch (goto_variable)
    {
        case 1:
            // some code
            goto_variable = 2
            break;
        case 2:
            goto_variable = 5   // case in etc. below
            break;
        case 3:
            goto_variable = 1
            break;

         etc. ...
    }

}

How do I navigate to another page when PHP script is done?

if ($done)
{
    header("Location: /url/to/the/other/page");
    exit;
}

How to add Google Maps Autocomplete search box?

Use Google Maps JavaScript API with places library to implement Google Maps Autocomplete search box in the webpage.

HTML

<input id="searchInput" class="controls" type="text" placeholder="Enter a location">

JavaScript

<script>
function initMap() {
    var input = document.getElementById('searchInput');
    var autocomplete = new google.maps.places.Autocomplete(input);
}
</script>

Complete guide, source code, and live demo can be found from here - Google Maps Autocomplete Search Box with Map and Info Window

Get a timestamp in C in microseconds?

struct timeval contains two components, the second and the microsecond. A timestamp with microsecond precision is represented as seconds since the epoch stored in the tv_sec field and the fractional microseconds in tv_usec. Thus you cannot just ignore tv_sec and expect sensible results.

If you use Linux or *BSD, you can use timersub() to subtract two struct timeval values, which might be what you want.

is the + operator less performant than StringBuffer.append()

Yes, according to the usual benchmarks. E.G : http://mckoss.com/jscript/SpeedTrial.htm.

But for the small strings, this is irrelevant. You will only care about performances on very large strings. What's more, in most JS script, the bottle neck is rarely on the string manipulations since there is not enough of it.

You'd better watch the DOM manipulation.

Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema

I guess your webpack version is 2.2.1. I think you should be using this Migration Guide --> https://webpack.js.org/guides/migrating/

Also, You can use this example of TypeSCript + Webpack 2.

JSON - Iterate through JSONArray

Change

JSONObject objects = getArray.getJSONArray(i);

to

JSONObject objects = getArray.getJSONObject(i);

or to

JSONObject objects = getArray.optJSONObject(i);

depending on which JSON-to/from-Java library you're using. (It looks like getJSONObject will work for you.)

Then, to access the string elements in the "objects" JSONObject, get them out by element name.

String a = objects.get("A");

If you need the names of the elements in the JSONObject, you can use the static utility method JSONObject.getNames(JSONObject) to do so.

String[] elementNames = JSONObject.getNames(objects);

"Get the value for the first element and the value for the last element."

If "element" is referring to the component in the array, note that the first component is at index 0, and the last component is at index getArray.length() - 1.


I want to iterate though the objects in the array and get thier component and thier value. In my example the first object has 3 components, the scond has 5 and the third has 4 components. I want iterate though each of them and get thier component name and value.

The following code does exactly that.

import org.json.JSONArray;
import org.json.JSONObject;

public class Foo
{
  public static void main(String[] args) throws Exception
  {
    String jsonInput = "{\"JObjects\":{\"JArray1\":[{\"A\":\"a\",\"B\":\"b\",\"C\":\"c\"},{\"A\":\"a1\",\"B\":\"b2\",\"C\":\"c3\",\"D\":\"d4\",\"E\":\"e5\"},{\"A\":\"aa\",\"B\":\"bb\",\"C\":\"cc\",\"D\":\"dd\"}]}}";

    // "I want to iterate though the objects in the array..."
    JSONObject outerObject = new JSONObject(jsonInput);
    JSONObject innerObject = outerObject.getJSONObject("JObjects");
    JSONArray jsonArray = innerObject.getJSONArray("JArray1");
    for (int i = 0, size = jsonArray.length(); i < size; i++)
    {
      JSONObject objectInArray = jsonArray.getJSONObject(i);

      // "...and get thier component and thier value."
      String[] elementNames = JSONObject.getNames(objectInArray);
      System.out.printf("%d ELEMENTS IN CURRENT OBJECT:\n", elementNames.length);
      for (String elementName : elementNames)
      {
        String value = objectInArray.getString(elementName);
        System.out.printf("name=%s, value=%s\n", elementName, value);
      }
      System.out.println();
    }
  }
}
/*
OUTPUT:
3 ELEMENTS IN CURRENT OBJECT:
name=A, value=a
name=B, value=b
name=C, value=c

5 ELEMENTS IN CURRENT OBJECT:
name=D, value=d4
name=E, value=e5
name=A, value=a1
name=B, value=b2
name=C, value=c3

4 ELEMENTS IN CURRENT OBJECT:
name=D, value=dd
name=A, value=aa
name=B, value=bb
name=C, value=cc
*/

Catching exceptions from Guzzle

To catch Guzzle errors you can do something like this:

try {
    $response = $client->get('/not_found.xml')->send();
} catch (Guzzle\Http\Exception\BadResponseException $e) {
    echo 'Uh oh! ' . $e->getMessage();
}

... but, to be able to "log" or "resend" your request try something like this:

// Add custom error handling to any request created by this client
$client->getEventDispatcher()->addListener(
    'request.error', 
    function(Event $event) {

        //write log here ...

        if ($event['response']->getStatusCode() == 401) {

            // create new token and resend your request...
            $newRequest = $event['request']->clone();
            $newRequest->setHeader('X-Auth-Header', MyApplication::getNewAuthToken());
            $newResponse = $newRequest->send();

            // Set the response object of the request without firing more events
            $event['response'] = $newResponse;

            // You can also change the response and fire the normal chain of
            // events by calling $event['request']->setResponse($newResponse);

            // Stop other events from firing when you override 401 responses
            $event->stopPropagation();
        }

});

... or if you want to "stop event propagation" you can overridde event listener (with a higher priority than -255) and simply stop event propagation.

$client->getEventDispatcher()->addListener('request.error', function(Event $event) {
if ($event['response']->getStatusCode() != 200) {
        // Stop other events from firing when you get stytus-code != 200
        $event->stopPropagation();
    }
});

thats a good idea to prevent guzzle errors like:

request.CRITICAL: Uncaught PHP Exception Guzzle\Http\Exception\ClientErrorResponseException: "Client error response

in your application.

What are named pipes?

Linux Pipes
First In First Out (FIFO) interproccess communication mechanism.

Unnamed Pipes
On the command line, represented by a "|" between two commands.

Named Pipes
A FIFO special file. Once created, you can use the pipe just like a normal file(open, close, write, read, etc).

To create a named pipe, called "myPipe", from the command line (man page):

mkfifo myPipe  

To create a named pipe from c, where "pathname" is the name you would like the pipe to have and "mode" contains the permissions you want the pipe to have (man page):

#include <sys/types.h>
#include <sys/stat.h>
int mkfifo(const char *pathname, mode_t mode);

Why "net use * /delete" does not work but waits for confirmation in my PowerShell script?

Try this:

net use * /delete /y

The /y key makes it select Yes in prompt silently

Preloading images with JavaScript

I can confirm that the approach in the question is sufficient to trigger the images to be downloaded and cached (unless you have forbidden the browser from doing so via your response headers) in, at least:

  • Chrome 74
  • Safari 12
  • Firefox 66
  • Edge 17

To test this, I made a small webapp with several endpoints that each sleep for 10 seconds before serving a picture of a kitten. Then I added two webpages, one of which contained a <script> tag in which each of the kittens is preloaded using the preloadImage function from the question, and the other of which includes all the kittens on the page using <img> tags.

In all the browsers above, I found that if I visited the preloader page first, waited a while, and then went to the page with the <img> tags, my kittens rendered instantly. This demonstrates that the preloader successfully loaded the kittens into the cache in all browsers tested.

You can see or try out the application I used to test this at https://github.com/ExplodingCabbage/preloadImage-test.

Note in particular that this technique works in the browsers above even if the number of images being looped over exceeds the number of parallel requests that the browser is willing to make at a time, contrary to what Robin's answer suggests. The rate at which your images preload will of course be limited by how many parallel requests the browser is willing to send, but it will eventually request each image URL you call preloadImage() on.

Can I redirect the stdout in python into some sort of string buffer?

There is contextlib.redirect_stdout() function in Python 3.4:

import io
from contextlib import redirect_stdout

with io.StringIO() as buf, redirect_stdout(buf):
    print('redirected')
    output = buf.getvalue()

Here's code example that shows how to implement it on older Python versions.

How do I drop table variables in SQL-Server? Should I even do this?

Table variables are automatically local and automatically dropped -- you don't have to worry about it.

Search text in stored procedure in SQL Server

I created a procedure to search text in procedures/functions, tables, views, or jobs. The first parameter @search is the search criterion, @target the search target, i.e., procedures, tables, etc. If not specified, search all. @db is to specify the database to search, default to your current database. Here is my query in dynamic SQL.

ALTER PROCEDURE [dbo].[usp_find_objects]
(
    @search VARCHAR(255),
    @target VARCHAR(255) = NULL,
    @db VARCHAR(35) = NULL
)
AS

SET NOCOUNT ON;

DECLARE @TSQL NVARCHAR(MAX), @USEDB NVARCHAR(50)

IF @db <> '' SET @USEDB = 'USE ' + @db
ELSE SET @USEDB = ''

IF @target IS NULL SET @target = ''

SET @TSQL = @USEDB + '

DECLARE @search VARCHAR(128) 
DECLARE @target VARCHAR(128)

SET @search = ''%' + @search + '%''
SET @target = ''' + @target + '''

IF @target LIKE ''%Procedure%'' BEGIN
    SELECT o.name As ''Stored Procedures''
    FROM SYSOBJECTS o 
    INNER JOIN SYSCOMMENTS c ON o.id = c.id
    WHERE c.text LIKE @search
        AND o.xtype IN (''P'',''FN'')
    GROUP BY o.name
    ORDER BY o.name
END

ELSE IF @target LIKE ''%View%'' BEGIN
    SELECT o.name As ''Views''
    FROM SYSOBJECTS o 
    INNER JOIN SYSCOMMENTS c ON o.id = c.id
    WHERE c.text LIKE @search
        AND o.xtype = ''V''
    GROUP BY o.name
    ORDER BY o.name
END

/* Table - search table name only, need to add column name */
ELSE IF @target LIKE ''%Table%'' BEGIN
    SELECT t.name AS ''TableName''
    FROM sys.columns c 
    JOIN sys.tables t ON c.object_id = t.object_id
    WHERE c.name LIKE @search
    ORDER BY TableName
END

ELSE IF @target LIKE ''%Job%'' BEGIN
    SELECT  j.job_id,
        s.srvname,
        j.name,
        js.step_id,
        js.command,
        j.enabled 
    FROM    [msdb].dbo.sysjobs j
    JOIN    [msdb].dbo.sysjobsteps js
        ON  js.job_id = j.job_id 
    JOIN    master.dbo.sysservers s
        ON  s.srvid = j.originating_server_id
    WHERE   js.command LIKE @search
END

ELSE BEGIN 
    SELECT o.name As ''Stored Procedures''
    FROM SYSOBJECTS o 
    INNER JOIN SYSCOMMENTS c ON o.id = c.id
    WHERE c.text LIKE @search
        AND o.xtype IN (''P'',''FN'')
    GROUP BY o.name
    ORDER BY o.name

    SELECT o.name As ''Views''
    FROM SYSOBJECTS o 
    INNER JOIN SYSCOMMENTS c ON o.id = c.id
    WHERE c.text LIKE @search
        AND o.xtype = ''V''
    GROUP BY o.name
    ORDER BY o.name

    SELECT t.name AS ''Tables''
    FROM sys.columns c 
    JOIN sys.tables t ON c.object_id = t.object_id
    WHERE c.name LIKE @search
    ORDER BY Tables

    SELECT  j.name AS ''Jobs''
    FROM    [msdb].dbo.sysjobs j
    JOIN    [msdb].dbo.sysjobsteps js
        ON  js.job_id = j.job_id 
    JOIN    master.dbo.sysservers s
        ON  s.srvid = j.originating_server_id
    WHERE   js.command LIKE @search
END
'

EXECUTE sp_executesql @TSQL

Update: If you renamed a procedure, it only updates sysobjects but not syscomments, which keeps the old name and therefore that procedure will not be included in the search result unless you drop and recreate the procedure.

How to check if a std::thread is still running?

If you are willing to make use of C++11 std::async and std::future for running your tasks, then you can utilize the wait_for function of std::future to check if the thread is still running in a neat way like this:

#include <future>
#include <thread>
#include <chrono>
#include <iostream>

int main() {
    using namespace std::chrono_literals;

    /* Run some task on new thread. The launch policy std::launch::async
       makes sure that the task is run asynchronously on a new thread. */
    auto future = std::async(std::launch::async, [] {
        std::this_thread::sleep_for(3s);
        return 8;
    });

    // Use wait_for() with zero milliseconds to check thread status.
    auto status = future.wait_for(0ms);

    // Print status.
    if (status == std::future_status::ready) {
        std::cout << "Thread finished" << std::endl;
    } else {
        std::cout << "Thread still running" << std::endl;
    }

    auto result = future.get(); // Get result.
}

If you must use std::thread then you can use std::promise to get a future object:

#include <future>
#include <thread>
#include <chrono>
#include <iostream>

int main() {
    using namespace std::chrono_literals;

    // Create a promise and get its future.
    std::promise<bool> p;
    auto future = p.get_future();

    // Run some task on a new thread.
    std::thread t([&p] {
        std::this_thread::sleep_for(3s);
        p.set_value(true); // Is done atomically.
    });

    // Get thread status using wait_for as before.
    auto status = future.wait_for(0ms);

    // Print status.
    if (status == std::future_status::ready) {
        std::cout << "Thread finished" << std::endl;
    } else {
        std::cout << "Thread still running" << std::endl;
    }

    t.join(); // Join thread.
}

Both of these examples will output:

Thread still running

This is of course because the thread status is checked before the task is finished.

But then again, it might be simpler to just do it like others have already mentioned:

#include <thread>
#include <atomic>
#include <chrono>
#include <iostream>

int main() {
    using namespace std::chrono_literals;

    std::atomic<bool> done(false); // Use an atomic flag.

    /* Run some task on a new thread.
       Make sure to set the done flag to true when finished. */
    std::thread t([&done] {
        std::this_thread::sleep_for(3s);
        done = true;
    });

    // Print status.
    if (done) {
        std::cout << "Thread finished" << std::endl;
    } else {
        std::cout << "Thread still running" << std::endl;
    }

    t.join(); // Join thread.
}

Edit:

There's also the std::packaged_task for use with std::thread for a cleaner solution than using std::promise:

#include <future>
#include <thread>
#include <chrono>
#include <iostream>

int main() {
    using namespace std::chrono_literals;

    // Create a packaged_task using some task and get its future.
    std::packaged_task<void()> task([] {
        std::this_thread::sleep_for(3s);
    });
    auto future = task.get_future();

    // Run task on new thread.
    std::thread t(std::move(task));

    // Get thread status using wait_for as before.
    auto status = future.wait_for(0ms);

    // Print status.
    if (status == std::future_status::ready) {
        // ...
    }

    t.join(); // Join thread.
}

How can I convert integer into float in Java?

Here is how you can do it :

public static void main(String[] args) {
    // TODO Auto-generated method stub
    int x = 3;
    int y = 2;
    Float fX = new Float(x);
    float res = fX.floatValue()/y;
    System.out.println("res = "+res);
}

See you !

Hide axis values but keep axis tick labels in matplotlib

Not sure this is the best way, but you can certainly replace the tick labels like this:

import matplotlib.pyplot as plt
x = range(10)
y = range(10)
plt.plot(x,y)
plt.xticks(x," ")
plt.show()

In Python 3.4 this generates a simple line plot with no tick labels on the x-axis. A simple example is here: http://matplotlib.org/examples/ticks_and_spines/ticklabels_demo_rotation.html

This related question also has some better suggestions: Hiding axis text in matplotlib plots

I'm new to python. Your mileage may vary in earlier versions. Maybe others can help?

How do I format a date as ISO 8601 in moment.js?

If you just want the date portion (e.g. 2017-06-27), and you want it to work regardless of time zone and also in Arabic, here is code I wrote:

function isoDate(date) {
    if (!date) {
        return null
    }
    date = moment(date).toDate()

    // don't call toISOString because it takes the time zone into
    // account which we don't want.  Also don't call .format() because it
    // returns Arabic instead of English

    var month = 1 + date.getMonth()
    if (month < 10) {
        month = '0' + month
    }
    var day = date.getDate()
    if (day < 10) {
        day = '0' + day
    }
    return date.getFullYear() + '-' + month + '-' + day
}

Error:Failed to open zip file. Gradle's dependency cache may be corrupt

you do not need to clean all files in dir C:\Users\ ~User Name~ \.gradle\wrapper\dists. and download all of them again

instead you can just delete the folder of gradle version you failed to download. In my case it was gradle-4.4-all so i just deleted that folder and android studio re downloaded gradle-4.4-all for me

In case you don't know version you was downloading:

Just go to help menu > show logs in explorer

their you will find idea.log open it and search for

Could not install Gradle distribution from 'https://services.gradle.org/distribution`

once you find it you will find gradle version you failed to download

Find out whether radio button is checked with JQuery?

You'd have to bind the click event of the checkbox, as the change event doesn't work in IE.

$('#radio_button').click(function(){
    // if ($(this).is(':checked')) alert('is checked'); 
    alert('check-checky-check was changed');
});

Now when you programmatically change the state, you have to trigger this event also:

$('#radio_button').attr("checked", "checked");
$('#radio_button').click();

How to add text at the end of each line in Vim?

Following Macro can also be used to accomplish your task.

qqA,^[0jq4@q

How to use <sec:authorize access="hasRole('ROLES)"> for checking multiple Roles?

you can try in this way if you are using thymeleaf

sec:authorize="hasAnyRole(T(com.orsbv.hcs.model.SystemRole).ADMIN.getName(),
               T(com.orsbv.hcs.model.SystemRole).SUPER_USER.getName(),'ROLE_MANAGEMENT')"

this will return true if the user has the mentioned roles,false otherwise.

Please note you have to use sec tag in your html declaration tag like this

<html xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity4">

Prevent scroll-bar from adding-up to the Width of page on Chrome

I can't add comment for the first answer and it's been a long time... but that demo has a problem:

if(b.prop('scrollHeight')>b.height()){
    normalw = window.innerWidth;
    scrollw = normalw - b.width();
    $('#container').css({marginRight:'-'+scrollw+'px'});
}

b.prop('scrollHeight') always equals b.height(),

I think it should be like this:

if(b.prop('scrollHeight')>window.innerHeight) ...

At last I recommend a method:

html {
 overflow-y: scroll;
}

:root {
  overflow-y: auto;
  overflow-x: hidden;
}

:root body {
  position: absolute;
}

body {
 width: 100vw;
 overflow: hidden;
}

How do I create a circle or square with just CSS - with a hollow center?

You can use special characters to make lots of shapes. Examples: http://jsfiddle.net/martlark/jWh2N/2/

_x000D_
_x000D_
<table>_x000D_
  <tr>_x000D_
    <td>hollow square</td>_x000D_
    <td>&#9633;</td>_x000D_
  </tr>_x000D_
  <tr>_x000D_
    <td>solid circle</td>_x000D_
    <td>&bull;</td>_x000D_
  </tr>_x000D_
  <tr>_x000D_
    <td>open circle</td>_x000D_
    <td>&#3664;</td>_x000D_
  </tr>_x000D_
_x000D_
</table>
_x000D_
_x000D_
_x000D_

enter image description here

Many more can be found here: HTML Special Characters

This API project is not authorized to use this API. Please ensure that this API is activated in the APIs Console

From the picture you posted, it say it's disabled...

Go to the Developer Console

Navigate to Google Maps -> APIs

Search for Geocoding and click on Google Maps Geocoding API -> Enable API. Do the same thing for Geolocating

Windows command to convert Unix line endings?

For convert UNIX(LF) to Windows(CR-LF) use next command

type file.txt > new_file.txt

Getting value GET OR POST variable using JavaScript?

_x000D_
_x000D_
/**_x000D_
* getGET: [Funcion que captura las variables pasados por GET]_x000D_
* @Implementacion [pagina.html?id=10&pos=3]_x000D_
* @param  {[const ]} loc           [capturamos la url]_x000D_
* @return {[array]} get [Devuelve un array de clave=>valor]_x000D_
*/_x000D_
const getGET = () => {_x000D_
    const loc = document.location.href;_x000D_
_x000D_
            // si existe el interrogante_x000D_
            if(loc.indexOf('?')>0){_x000D_
            // cogemos la parte de la url que hay despues del interrogante_x000D_
            const getString = loc.split('?')[1];_x000D_
            // obtenemos un array con cada clave=valor_x000D_
            const GET = getString.split('&');_x000D_
            const get = {};_x000D_
_x000D_
            // recorremos todo el array de valores_x000D_
            for(let i = 0, l = GET.length; i < l; i++){_x000D_
                const tmp = GET[i].split('=');_x000D_
                get[tmp[0]] = unescape(decodeURI(tmp[1]));_x000D_
            }//::END for_x000D_
            return get;_x000D_
        }//::END if _x000D_
}//::END getGET_x000D_
_x000D_
/**_x000D_
* [DOMContentLoaded]_x000D_
* @param  {[const]} valores  [Cogemos los valores pasados por get]_x000D_
* @return {[document.write]}       _x000D_
*/_x000D_
document.addEventListener('DOMContentLoaded', () => {_x000D_
    const valores=getGET();_x000D_
_x000D_
    if(valores){_x000D_
            // hacemos un bucle para pasar por cada indice del array de valores_x000D_
            for(const index in valores){_x000D_
                document.write(`<br>clave: ${index} - valor: ${valores[index]}`);_x000D_
            }//::END for_x000D_
        }else{_x000D_
            // no se ha recibido ningun parametro por GET_x000D_
            document.write("<br>No se ha recibido ningún parámetro");_x000D_
        }//::END if_x000D_
});//::END DOMContentLoaded
_x000D_
_x000D_
_x000D_

How can I make a button redirect my page to another page?

Just another variation:

    <body>
    <button name="redirect" onClick="redirect()">

    <script type="text/javascript">
    function redirect()
    {
    var url = "http://www.(url).com";
    window.location(url);
    }
    </script>

Bootstrap fixed header and footer with scrolling body-content area in fluid-container

Another option would be using flexbox.

While it's not supported by IE8 and IE9, you could consider:

  • Not minding about those old IE versions
  • Providing a fallback
  • Using a polyfill

Despite some additional browser-specific style prefixing would be necessary for full cross-browser support, you can see the basic usage either on this fiddle and on the following snippet:

_x000D_
_x000D_
html {_x000D_
  height: 100%;_x000D_
}_x000D_
html body {_x000D_
  height: 100%;_x000D_
  overflow: hidden;_x000D_
  display: flex;_x000D_
  flex-direction: column;_x000D_
}_x000D_
html body .container-fluid.body-content {_x000D_
  width: 100%;_x000D_
  overflow-y: auto;_x000D_
}_x000D_
header {_x000D_
    background-color: #4C4;_x000D_
    min-height: 50px;_x000D_
    width: 100%;_x000D_
}_x000D_
footer {_x000D_
    background-color: #4C4;_x000D_
    min-height: 30px;_x000D_
    width: 100%;_x000D_
}
_x000D_
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" rel="stylesheet"/>_x000D_
<header></header>_x000D_
<div class="container-fluid body-content">_x000D_
  Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>_x000D_
  Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>_x000D_
  Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>_x000D_
  Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>_x000D_
  Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>_x000D_
</div>_x000D_
<footer></footer>
_x000D_
_x000D_
_x000D_

Entity Framework The underlying provider failed on Open

I had this error and it was caused by a typo in the connection string in App.config.

Get keys from HashMap in Java

A solution can be, if you know the key position, convert the keys into an String array and return the value in the position:

public String getKey(int pos, Map map) {
    String[] keys = (String[]) map.keySet().toArray(new String[0]);

    return keys[pos];
}

Android get image from gallery into ImageView

This is the easiest way to get image from gallery and crop ass well

step 1: StartActivity for result

imageUser.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Intent intent = new Intent(Intent.ACTION_PICK,
                    MediaStore.Images.Media.INTERNAL_CONTENT_URI);
            intent.setType("image/*");
            intent.putExtra("crop", "true");
            intent.putExtra("scale", true);
            intent.putExtra("outputX", 256);
            intent.putExtra("outputY", 256);
            intent.putExtra("aspectX", 1);
            intent.putExtra("aspectY", 1);
            intent.putExtra("return-data", true);
            startActivityForResult(intent, 1);

            }
    });

step 2:Handle the result

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode != RESULT_OK) {
        return;
    }
    if (requestCode == 1) {
        final Bundle extras = data.getExtras();
        if (extras != null) {
            //Get image
            Bitmap ProfilePic = extras.getParcelable("data");
            imageUser.setImageBitmap(ProfilePic);
            TextView t=(TextView)findViewById(R.id.textoverimage);
            t.setText("image Selected");
        }
    }


}

Symfony 2 EntityManager injection in service

Note as of Symfony 3.3 EntityManager is depreciated. Use EntityManagerInterface instead.

namespace AppBundle\Service;

use Doctrine\ORM\EntityManagerInterface;

class Someclass {
    protected $em;

    public function __construct(EntityManagerInterface $entityManager)
    {
        $this->em = $entityManager;
    }

    public function somefunction() {
        $em = $this->em;
        ...
    }
}

How to Convert Int to Unsigned Byte and Back

Even though it's too late, I'd like to give my input on this as it might clarify why the solution given by JB Nizet works. I stumbled upon this little problem working on a byte parser and to string conversion myself. When you copy from a bigger size integral type to a smaller size integral type as this java doc says this happens:

https://docs.oracle.com/javase/specs/jls/se7/html/jls-5.html#jls-5.1.3 A narrowing conversion of a signed integer to an integral type T simply discards all but the n lowest order bits, where n is the number of bits used to represent type T. In addition to a possible loss of information about the magnitude of the numeric value, this may cause the sign of the resulting value to differ from the sign of the input value.

You can be sure that a byte is an integral type as this java doc says https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html byte: The byte data type is an 8-bit signed two's complement integer.

So in the case of casting an integer(32 bits) to a byte(8 bits), you just copy the last (least significant 8 bits) of that integer to the given byte variable.

int a = 128;
byte b = (byte)a; // Last 8 bits gets copied
System.out.println(b);  // -128

Second part of the story involves how Java unary and binary operators promote operands. https://docs.oracle.com/javase/specs/jls/se7/html/jls-5.html#jls-5.6.2 Widening primitive conversion (§5.1.2) is applied to convert either or both operands as specified by the following rules:

If either operand is of type double, the other is converted to double.

Otherwise, if either operand is of type float, the other is converted to float.

Otherwise, if either operand is of type long, the other is converted to long.

Otherwise, both operands are converted to type int.

Rest assured, if you are working with integral type int and/or lower it'll be promoted to an int.

// byte b(0x80) gets promoted to int (0xFF80) by the & operator and then
// 0xFF80 & 0xFF (0xFF translates to 0x00FF) bitwise operation yields 
// 0x0080
a = b & 0xFF;
System.out.println(a); // 128

I scratched my head around this too :). There is a good answer for this here by rgettman. Bitwise operators in java only for integer and long?

Access to the requested object is only available from the local network phpmyadmin

Not need to change all config in file /opt/lampp/etc/extra/httpd-xampp.conf. The only thing you need to change is the Require local It's kinda obvious what Require local means so just change to Require all granted Require all granted

Solution

from Require local to Require all granted

How to pass data using NotificationCenter in swift 3.0 and NSNotificationCenter in swift 2.0?

For Swift 3

let imageDataDict:[String: UIImage] = ["image": image]

  // post a notification
  NotificationCenter.default.post(name: NSNotification.Name(rawValue: "notificationName"), object: nil, userInfo: imageDataDict) 
  // `default` is now a property, not a method call

 // Register to receive notification in your class
 NotificationCenter.default.addObserver(self, selector: #selector(self.showSpinningWheel(_:)), name: NSNotification.Name(rawValue: "notificationName"), object: nil)

 // handle notification
 func showSpinningWheel(_ notification: NSNotification) {
        print(notification.userInfo ?? "")
        if let dict = notification.userInfo as NSDictionary? {
            if let id = dict["image"] as? UIImage{
                // do something with your image
            }
        }
 }

For Swift 4

let imageDataDict:[String: UIImage] = ["image": image]

  // post a notification
  NotificationCenter.default.post(name: NSNotification.Name(rawValue: "notificationName"), object: nil, userInfo: imageDataDict) 
  // `default` is now a property, not a method call

 // Register to receive notification in your class
 NotificationCenter.default.addObserver(self, selector: #selector(self.showSpinningWheel(_:)), name: NSNotification.Name(rawValue: "notificationName"), object: nil)

 // handle notification
 @objc func showSpinningWheel(_ notification: NSNotification) {
        print(notification.userInfo ?? "")
        if let dict = notification.userInfo as NSDictionary? {
            if let id = dict["image"] as? UIImage{
                // do something with your image
            }
        }
 }

How can I change a file's encoding with vim?

Just like your steps, setting fileencoding should work. However, I'd like to add one "set bomb" to help editor consider the file as UTF8.

$ vim file
:set bomb
:set fileencoding=utf-8
:wq

how to convert current date to YYYY-MM-DD format with angular 2

Here is a very nice and compact way to do this, you can also change this function as your case needs:

result: 03.11.2017

//get date now function
    getNowDate() {
    //return string
    var returnDate = "";
    //get datetime now
    var today = new Date();
    //split
    var dd = today.getDate();
    var mm = today.getMonth() + 1; //because January is 0! 
    var yyyy = today.getFullYear();
    //Interpolation date
    if (dd < 10) {
        returnDate += `0${dd}.`;
    } else {
        returnDate += `${dd}.`;
    }

    if (mm < 10) {
        returnDate += `0${mm}.`;
    } else {
        returnDate += `${mm}.`;
    }
    returnDate += yyyy;
    return returnDate;
}

Remove a prefix from a string

I think you can use methods of the str type to do this. There's no need for regular expressions:

def remove_prefix(text, prefix):
    if text.startswith(prefix): # only modify the text if it starts with the prefix
         text = text.replace(prefix, "", 1) # remove one instance of prefix
    return text

how to clear JTable

((DefaultTableModel)jTable3.getModel()).setNumRows(0); // delet all table row

Try This:

Cannot make file java.io.IOException: No such file or directory

I got the same problem when using rest-easy. After searching while i figured that this error occured when there is no place to keep temporary files. So in tomcat you can just create tomcat-root/temp folder.

Comparing strings in C# with OR in an if statement

try

if (testString.Equals(testString2)){
}

How to support different screen size in android

Adding to @ud_an

It is not a good practice to create different folders for layouts. Create your layout such that it works fine with all the screen sizes. To achieve this, play with the layout attributes. You only need to have different images for hdpi, mdpi and ldpi types. The rest will be managed by android OS.

PHP combine two associative arrays into one array

array_merge() is more efficient but there are a couple of options:

$array1 = array("id1" => "value1");

$array2 = array("id2" => "value2", "id3" => "value3", "id4" => "value4");

$array3 = array_merge($array1, $array2/*, $arrayN, $arrayN*/);
$array4 = $array1 + $array2;

echo '<pre>';
var_dump($array3);
var_dump($array4);
echo '</pre>';


// Results:
    array(4) {
      ["id1"]=>
      string(6) "value1"
      ["id2"]=>
      string(6) "value2"
      ["id3"]=>
      string(6) "value3"
      ["id4"]=>
      string(6) "value4"
    }
    array(4) {
      ["id1"]=>
      string(6) "value1"
      ["id2"]=>
      string(6) "value2"
      ["id3"]=>
      string(6) "value3"
      ["id4"]=>
      string(6) "value4"
    }

How to add parameters to a HTTP GET request in Android?

As of HttpComponents 4.2+ there is a new class URIBuilder, which provides convenient way for generating URIs.

You can use either create URI directly from String URL:

List<NameValuePair> listOfParameters = ...;

URI uri = new URIBuilder("http://example.com:8080/path/to/resource?mandatoryParam=someValue")
    .addParameter("firstParam", firstVal)
    .addParameter("secondParam", secondVal)
    .addParameters(listOfParameters)
    .build();

Otherwise, you can specify all parameters explicitly:

URI uri = new URIBuilder()
    .setScheme("http")
    .setHost("example.com")
    .setPort(8080)
    .setPath("/path/to/resource")
    .addParameter("mandatoryParam", "someValue")
    .addParameter("firstParam", firstVal)
    .addParameter("secondParam", secondVal)
    .addParameters(listOfParameters)
    .build();

Once you have created URI object, then you just simply need to create HttpGet object and perform it:

//create GET request
HttpGet httpGet = new HttpGet(uri);
//perform request
httpClient.execute(httpGet ...//additional parameters, handle response etc.

get the margin size of an element with jquery

You'll want to use...

alert(parseInt($this.parents("div:.item-form").css("marginTop").replace('px', '')));
alert(parseInt($this.parents("div:.item-form").css("marginRight").replace('px', '')));
alert(parseInt($this.parents("div:.item-form").css("marginBottom").replace('px', '')));
alert(parseInt($this.parents("div:.item-form").css("marginLeft").replace('px', '')));

How to resolve : Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core"

I know this thread is a year old now but having experienced the same problem I managed to solve the problem by setting a target server for my project.

i.e. right-click on your project and select 'Properties' -> 'Targeted Runtimes' and select the server you going to run your web app on (Tomcat 6 or 7).

How to add a boolean datatype column to an existing table in sql?

Below query worked for me with default value false;

ALTER TABLE cti_contract_account ADD ready_to_audit BIT DEFAULT 0 NOT NULL;

How can I get onclick event on webview in android?

Thats because its tied to the web view not the button. I had the same problem after implementing. The button had no affect but the page in the web view did.

Functions that return a function

Create a variable:

var thing1 = undefined;

Declare a Function:

function something1 () {
    return "Hi there, I'm number 1!";
}

Alert the value of thing1 (our first variable):

alert(thing1); // Outputs: "undefined".

Now, if we wanted thing1 to be a reference to the function something1, meaning it would be the same thing as our created function, we would do:

thing1 = something1;

However, if we wanted the return value of the function then we must assign it the return value of the executed function. You execute the function by using parenthesis:

thing1 = something1(); // Value of thing1: "Hi there, I'm number 1!" 

Get environment value in controller

In Controller

$hostname = $_ENV['IMAP_HOSTNAME_TEST']; (or) $hostname = env('IMAP_HOSTNAME_TEST');

In blade.view

{{$_ENV['IMAP_HOSTNAME_TEST']}}

React: why child component doesn't update when prop changes

When create React components from functions and useState.

const [drawerState, setDrawerState] = useState(false);

const toggleDrawer = () => {
      // attempting to trigger re-render
      setDrawerState(!drawerState);
};

This does not work

         <Drawer
            drawerState={drawerState}
            toggleDrawer={toggleDrawer}
         />

This does work (adding key)

         <Drawer
            drawerState={drawerState}
            key={drawerState}
            toggleDrawer={toggleDrawer}
         />

Passing a variable from one php include file to another: global vs. not

This is all you have to do:

In front.inc

global $name;
$name = 'james';

PHP preg_match - only allow alphanumeric strings and - _ characters

Code:

if(preg_match('/[^a-z_\-0-9]/i', $string))
{
  echo "not valid string";
}

Explanation:

  • [] => character class definition
  • ^ => negate the class
  • a-z => chars from 'a' to 'z'
  • _ => underscore
  • - => hyphen '-' (You need to escape it)
  • 0-9 => numbers (from zero to nine)

The 'i' modifier at the end of the regex is for 'case-insensitive' if you don't put that you will need to add the upper case characters in the code before by doing A-Z

How to make Git "forget" about a file that was tracked but is now in .gitignore?

The copy/paste answer is git rm --cached -r .; git add .; git status

This command will ignore the files that have already been committed to a Git repository but now we have added them to .gitignore.

Create an enum with string values

Here's a fairly clean solution that allows inheritance, using TypeScript 2.0. I didn't try this on an earlier version.

Bonus: the value can be any type!

export class Enum<T> {
  public constructor(public readonly value: T) {}
  public toString() {
    return this.value.toString();
  }
}

export class PrimaryColor extends Enum<string> {
  public static readonly Red = new Enum('#FF0000');
  public static readonly Green = new Enum('#00FF00');
  public static readonly Blue = new Enum('#0000FF');
}

export class Color extends PrimaryColor {
  public static readonly White = new Enum('#FFFFFF');
  public static readonly Black = new Enum('#000000');
}

// Usage:

console.log(PrimaryColor.Red);
// Output: Enum { value: '#FF0000' }
console.log(Color.Red); // inherited!
// Output: Enum { value: '#FF0000' }
console.log(Color.Red.value); // we have to call .value to get the value.
// Output: #FF0000
console.log(Color.Red.toString()); // toString() works too.
// Output: #FF0000

class Thing {
  color: Color;
}

let thing: Thing = {
  color: Color.Red,
};

switch (thing.color) {
  case Color.Red: // ...
  case Color.White: // ...
}

Core dumped, but core file is not in the current directory?

I could think of two following possibilities:

  1. As others have already pointed out, the program might chdir(). Is the user running the program allowed to write into the directory it chdir()'ed to? If not, it cannot create the core dump.

  2. For some weird reason the core dump isn't named core.* You can check /proc/sys/kernel/core_pattern for that. Also, the find command you named wouldn't find a typical core dump. You should use find / -name "*core.*", as the typical name of the coredump is core.$PID

PostgreSQL function for last inserted ID

Try this:

select nextval('my_seq_name');  // Returns next value

If this return 1 (or whatever is the start_value for your sequence), then reset the sequence back to the original value, passing the false flag:

select setval('my_seq_name', 1, false);

Otherwise,

select setval('my_seq_name', nextValue - 1, true);

This will restore the sequence value to the original state and "setval" will return with the sequence value you are looking for.

How to remove blank lines from a Unix file

You can sed's -i option to edit in-place without using temporary file:

 sed -i '/^$/d' file

Using moment.js to convert date to string "MM/dd/yyyy"

this also might be relevant to anyone using React -

install react-moment (npm i react-moment)

import Moment from 'react-moment'


<Moment format="MM/DD/YYYY">{yourTimeStamp}</Moment>

(or any other format you'd like)

Android Studio: Gradle - build fails -- Execution failed for task ':dexDebug'

Many of the answers here are trial and error to find duplicate dependencies but if you scroll up just a little bit from the Execution failed for task ':app:dexDebug'. line it will give you a hint at the duplications

error with a hint.

In my case I had the following error:

UNEXPECTED TOP-LEVEL EXCEPTION:
com.android.dex.DexException: Multiple dex files define L/com/parse/AbstractQueryController$1;
...
...
...
Execution failed for task ':app:dexDebug'.

So I knew that in order to fix this bug I needed to find the duplicate dependencies that define parse.AbstractQueryController

In my case I had two imported modules that were loading in two different Parse libraries. Making my project only load one fixed my issue.

Finding import static statements for Mockito constructs

The problem is that static imports from Hamcrest and Mockito have similar names, but return Matchers and real values, respectively.

One work-around is to simply copy the Hamcrest and/or Mockito classes and delete/rename the static functions so they are easier to remember and less show up in the auto complete. That's what I did.

Also, when using mocks, I try to avoid assertThat in favor other other assertions and verify, e.g.

assertEquals(1, 1);
verify(someMock).someMethod(eq(1));

instead of

assertThat(1, equalTo(1));
verify(someMock).someMethod(eq(1));

If you remove the classes from your Favorites in Eclipse, and type out the long name e.g. org.hamcrest.Matchers.equalTo and do CTRL+SHIFT+M to 'Add Import' then autocomplete will only show you Hamcrest matchers, not any Mockito matchers. And you can do this the other way so long as you don't mix matchers.

TortoiseGit-git did not exit cleanly (exit code 1)

My Git account started having problems right after I changed my email address (my work email changed). I tried everything I could, uninstalling, reinstalling, spending time on the phone with git helpdesk, etc.

Gave up and created a new email address and new account, but still kept getting 'did not exit cleanly' message.

How I resolved was: uninstall everything git related, remove all references to anything git including tortoise under appdata, delete all git folders under Program Files and Program Files (x86), remove Window Credentials (Credential Manager in Control Panel) for all things git, reboot, reinstall with new account.

How can I set my Cygwin PATH to find javac?

Although all other answers are technically correct, I would recommend you adding the custom path to the beginning of your PATH, not at the end. That way it would be the first place to look for instead of the last:

Add to bottom of ~/.bash_profile:

export PATH="/cygdrive/C/Program Files/Java/jdk1.6.0_23/bin/":$PATH

That way if you have more than one java or javac it will use the one you provided first.

How to lock orientation of one view controller to portrait mode only in Swift

Actual tested Solution for this.In my example I need my whole app should be in portrait mode, but only one screen's orientation should be in landscape mode. Make a Portrait orientation for app , by check only portrait mode

Code in AppDelegate as above answers described.

var orientationLock = UIInterfaceOrientationMask.all

func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask 
{
  return self.orientationLock
}
struct AppUtility {  

static func lockOrientation(_ orientation: UIInterfaceOrientationMask) {
    if let delegate = UIApplication.shared.delegate as? AppDelegate {
        delegate.orientationLock = orientation
    }
}
static func lockOrientation(_ orientation: UIInterfaceOrientationMask, andRotateTo rotateOrientation:UIInterfaceOrientation) {
self.lockOrientation(orientation)     
UIDevice.current.setValue(rotateOrientation.rawValue, forKey: "orientation")
}  
}

Then write down this code before your landscape orientation viewcontroller will be presented/push.

override func viewWillAppear(_ animated: Bool) {  
super.viewWillAppear(animated)
AppDelegate.AppUtility.lockOrientation(UIInterfaceOrientationMask.portrait, andRotateTo: UIInterfaceOrientation.portrait)
}  

Then write down this code in actual viewcontroller(For landscape view)

override func viewWillAppear(_ animated: Bool) {  
super.viewWillAppear(animated)
AppDelegate.AppUtility.lockOrientation(UIInterfaceOrientationMask.landscape, andRotateTo: UIInterfaceOrientation.landscape)
}  

How to create an ArrayList from an Array in PowerShell?

I can't get that constructor to work either. This however seems to work:

# $temp = Get-ResourceFiles
$resourceFiles = New-Object System.Collections.ArrayList($null)
$resourceFiles.AddRange($temp)

You can also pass an integer in the constructor to set an initial capacity.

What do you mean when you say you want to enumerate the files? Why can't you just filter the wanted values into a fresh array?

Edit:

It seems that you can use the array constructor like this:

$resourceFiles = New-Object System.Collections.ArrayList(,$someArray)

Note the comma. I believe what is happening is that when you call a .NET method, you always pass parameters as an array. PowerShell unpacks that array and passes it to the method as separate parameters. In this case, we don't want PowerShell to unpack the array; we want to pass the array as a single unit. Now, the comma operator creates arrays. So PowerShell unpacks the array, then we create the array again with the comma operator. I think that is what is going on.

How to display scroll bar onto a html table

Not sure why no one mentioned to just use the built-in sticky header style for elements. Worked great for me.

.tableContainerDiv {
   overflow: auto;
   max-height: 80em;
}
th {
   position: sticky;
   top: 0;
   background: white;
}

Put a min-width on the in @media if you need to make responsive (or similar).

see Table headers position:sticky or Position Sticky and Table Headers

fatal: git-write-tree: error building trees

I used:

 git reset --hard

I lost some changes, but this is ok.

How to initialize an array in Kotlin with values?

Here's an example:

fun main(args: Array<String>) {
    val arr = arrayOf(1, 2, 3);
    for (item in arr) {
        println(item);
    }
}

You can also use a playground to test language features.

What are the best JVM settings for Eclipse?

You can also try running with JRockit. It's a JVM optimized for servers, but many long running client applications, like IDE's, run very well on JRockit. Eclipse is no exception. JRockit doesn't have a perm-space so you don't need to configure it.

It's possible set a pause time target(ms) to avoid long gc pauses stalling the UI.

-showsplash
org.eclipse.platform
-vm
 C:\jrmc-3.1.2-1.6.0\bin\javaw.exe 
-vmargs
-XgcPrio:deterministic
-XpauseTarget:20

I usually don't bother setting -Xmx and -Xms and let JRockit grow the heap as it sees necessary. If you launch your Eclipse application with JRockit you can also monitor, profile and find memory leaks in your application using the JRockit Mission Control tools suite. You download the plugins from this update site. Note, only works for Eclipse 3.3 and Eclipse 3.4

Creating Dynamic button with click event in JavaScript

Wow you're close. Edits in comments:

_x000D_
_x000D_
function add(type) {_x000D_
  //Create an input type dynamically.   _x000D_
  var element = document.createElement("input");_x000D_
  //Assign different attributes to the element. _x000D_
  element.type = type;_x000D_
  element.value = type; // Really? You want the default value to be the type string?_x000D_
  element.name = type; // And the name too?_x000D_
  element.onclick = function() { // Note this is a function_x000D_
    alert("blabla");_x000D_
  };_x000D_
_x000D_
  var foo = document.getElementById("fooBar");_x000D_
  //Append the element in page (in span).  _x000D_
  foo.appendChild(element);_x000D_
}_x000D_
document.getElementById("btnAdd").onclick = function() {_x000D_
  add("text");_x000D_
};
_x000D_
<input type="button" id="btnAdd" value="Add Text Field">_x000D_
<p id="fooBar">Fields:</p>
_x000D_
_x000D_
_x000D_

Now, instead of setting the onclick property of the element, which is called "DOM0 event handling," you might consider using addEventListener (on most browsers) or attachEvent (on all but very recent Microsoft browsers) — you'll have to detect and handle both cases — as that form, called "DOM2 event handling," has more flexibility. But if you don't need multiple handlers and such, the old DOM0 way works fine.


Separately from the above: You might consider using a good JavaScript library like jQuery, Prototype, YUI, Closure, or any of several others. They smooth over browsers differences like the addEventListener / attachEvent thing, provide useful utility features, and various other things. Obviously there's nothing a library can do that you can't do without one, as the libraries are just JavaScript code. But when you use a good library with a broad user base, you get the benefit of a huge amount of work already done by other people dealing with those browsers differences, etc.

How to empty/destroy a session in rails?

to delete a user's session

session.delete(:user_id)

Eclipse - Failed to create the java virtual machine

For me it was a memory issue. If I run tomcat with my (large) webapp then try to start Eclipse, I get the Eclipse error. If I start Eclipse first, then start tomcat and my webapp, all works as expected.

What is an unhandled promise rejection?

"DeprecationWarning: Unhandled promise rejections are deprecated"

TLDR: A promise has resolve and reject, doing a reject without a catch to handle it is deprecated, so you will have to at least have a catch at top level.

VBA Print to PDF and Save with Automatic File Name

Hopefully this is self explanatory enough. Use the comments in the code to help understand what is happening. Pass a single cell to this function. The value of that cell will be the base file name. If the cell contains "AwesomeData" then we will try and create a file in the current users desktop called AwesomeData.pdf. If that already exists then try AwesomeData2.pdf and so on. In your code you could just replace the lines filename = Application..... with filename = GetFileName(Range("A1"))

Function GetFileName(rngNamedCell As Range) As String
    Dim strSaveDirectory As String: strSaveDirectory = ""
    Dim strFileName As String: strFileName = ""
    Dim strTestPath As String: strTestPath = ""
    Dim strFileBaseName As String: strFileBaseName = ""
    Dim strFilePath As String: strFilePath = ""
    Dim intFileCounterIndex As Integer: intFileCounterIndex = 1

    ' Get the users desktop directory.
    strSaveDirectory = Environ("USERPROFILE") & "\Desktop\"
    Debug.Print "Saving to: " & strSaveDirectory

    ' Base file name
    strFileBaseName = Trim(rngNamedCell.Value)
    Debug.Print "File Name will contain: " & strFileBaseName

    ' Loop until we find a free file number
    Do
        If intFileCounterIndex > 1 Then
            ' Build test path base on current counter exists.
            strTestPath = strSaveDirectory & strFileBaseName & Trim(Str(intFileCounterIndex)) & ".pdf"
        Else
            ' Build test path base just on base name to see if it exists.
            strTestPath = strSaveDirectory & strFileBaseName & ".pdf"
        End If

        If (Dir(strTestPath) = "") Then
            ' This file path does not currently exist. Use that.
            strFileName = strTestPath
        Else
            ' Increase the counter as we have not found a free file yet.
            intFileCounterIndex = intFileCounterIndex + 1
        End If

    Loop Until strFileName <> ""

    ' Found useable filename
    Debug.Print "Free file name: " & strFileName
    GetFileName = strFileName

End Function

The debug lines will help you figure out what is happening if you need to step through the code. Remove them as you see fit. I went a little crazy with the variables but it was to make this as clear as possible.

In Action

My cell O1 contained the string "FileName" without the quotes. Used this sub to call my function and it saved a file.

Sub Testing()
    Dim filename As String: filename = GetFileName(Range("o1"))

    ActiveWorkbook.Worksheets("Sheet1").Range("A1:N24").ExportAsFixedFormat Type:=xlTypePDF, _
                                              filename:=filename, _
                                              Quality:=xlQualityStandard, _
                                              IncludeDocProperties:=True, _
                                              IgnorePrintAreas:=False, _
                                              OpenAfterPublish:=False
End Sub

Where is your code located in reference to everything else? Perhaps you need to make a module if you have not already and move your existing code into there.

Listing all extras of an Intent

If for debugging all you want is a string (sort of implied by the OP but not explicitly stated), simply use toString on the extras Bundle:

intent.getExtras().toString()

It returns a string such as:

Bundle[{key1=value1, key2=value2, key3=value3}]

Documentation: Bundle.toString() (it's unfortunately the default Object.toString() javadoc and as such quite useless here.)

How to get all of the IDs with jQuery?

for(i=1;i<13;i++)     
{

   alert($("#tdt"+i).val());  

}  

How to loop through array in jQuery?

Use the each() function of jQuery.

Here is an example:

$.each(currnt_image_list.split(','), function(index, value) { 
  alert(index + ': ' + value); 
});

How do I bind onchange event of a TextBox using JQuery?

You must change the event name from "change" to "onchange":

$(document).ready(function(){
        $("input#tags").bind("onchange", autoFill);
          });

or use the shortcut binder method change:

$(document).ready(function(){
        $("input#tags").change(autoFill);
          });

Note that the onchange event usually fires when the user leave the input, so for auto-complete you better use the keydown event.

How to ignore user's time zone and force Date() use specific time zone

A Date object's underlying value is actually in UTC. To prove this, notice that if you type new Date(0) you'll see something like: Wed Dec 31 1969 16:00:00 GMT-0800 (PST). 0 is treated as 0 in GMT, but .toString() method shows the local time.

Big note, UTC stands for Universal time code. The current time right now in 2 different places is the same UTC, but the output can be formatted differently.

What we need here is some formatting

var _date = new Date(1270544790922); 
// outputs > "Tue Apr 06 2010 02:06:30 GMT-0700 (PDT)", for me
_date.toLocaleString('fi-FI', { timeZone: 'Europe/Helsinki' });
// outputs > "6.4.2010 klo 12.06.30"
_date.toLocaleString('en-US', { timeZone: 'Europe/Helsinki' });
// outputs > "4/6/2010, 12:06:30 PM"

This works but.... you can't really use any of the other date methods for your purposes since they describe the user's timezone. What you want is a date object that's related to the Helsinki timezone. Your options at this point are to use some 3rd party library (I recommend this), or hack-up the date object so you can use most of it's methods.

Option 1 - a 3rd party like moment-timezone

moment(1270544790922).tz('Europe/Helsinki').format('YYYY-MM-DD HH:mm:ss')
// outputs > 2010-04-06 12:06:30
moment(1270544790922).tz('Europe/Helsinki').hour()
// outputs > 12

This looks a lot more elegant than what we're about to do next.

Option 2 - Hack up the date object

var currentHelsinkiHoursOffset = 2; // sometimes it is 3
var date = new Date(1270544790922);
var helsenkiOffset = currentHelsinkiHoursOffset*60*60000;
var userOffset = _date.getTimezoneOffset()*60000; // [min*60000 = ms]
var helsenkiTime = new Date(date.getTime()+ helsenkiOffset + userOffset);
// Outputs > Tue Apr 06 2010 12:06:30 GMT-0700 (PDT)

It still thinks it's GMT-0700 (PDT), but if you don't stare too hard you may be able to mistake that for a date object that's useful for your purposes.

I conveniently skipped a part. You need to be able to define currentHelsinkiOffset. If you can use date.getTimezoneOffset() on the server side, or just use some if statements to describe when the time zone changes will occur, that should solve your problem.

Conclusion - I think especially for this purpose you should use a date library like moment-timezone.

Angular CLI - Please add a @NgModule annotation when using latest

In my case, I created a new ChildComponent in Parentcomponent whereas both in the same module but Parent is registered in a shared module so I created ChildComponent using CLI which registered Child in the current module but my parent was registered in the shared module.

So register the ChildComponent in Shared Module manually.

Angular 2 Scroll to top on Route Change

As of Angular 6.1, the router provides a configuration option called scrollPositionRestoration, this is designed to cater for this scenario.

imports: [
  RouterModule.forRoot(routes, {
    scrollPositionRestoration: 'enabled'
  }),
  ...
]

htaccess - How to force the client's browser to clear the cache?

I got your problem...

Although we can clear client browser cache completely but you can add some code to your application so that your recent changes reflect to client browser.

In your <head>:

<meta http-equiv="Cache-Control" content="no-cache" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />

Source: http://goo.gl/JojsO

jQuery Button.click() event is triggered twice

This can be caused for following reasons:

  1. You have included the script more than once in the same html file
  2. You have added the event listener twice (eg: using onclick attribute on the element and also with jquery
  3. The event is bubbled up to some parent element. (you may consider using event.stopPropagation).
  4. If you use template inheritance like extends in Django, most probably you have included the script in more than one file which are combined together by include or extend template tags
  5. If you are using Django template, you have wrongly placed a block inside another.

So, you should either find them out and remove the duplicate import. It is the best thing to do.

Another solution is to remove all click event listeners first in the script like:

$("#myId").off().on("click", function(event) {
event.stopPropagation();
});

You can skip event.stopPropagation(); if you are sure that the event is not bubbled.

What is .Net Framework 4 extended?

It's the part of the .NET Framework that isn't contained within the Client Profile. See MSDN for more info; specifically:

The .NET Framework is made up of the .NET Framework 4 Client Profile and .NET Framework 4 Extended components that exist separately in Programs and Features.

Query-string encoding of a Javascript Object

You can also achieve this by using simple JavaScript.

_x000D_
_x000D_
const stringData = '?name=Nikhil&surname=Mahirrao&age=30';_x000D_
    _x000D_
const newData= {};_x000D_
stringData.replace('?', '').split('&').map((value) => {_x000D_
  const temp = value.split('=');_x000D_
  newData[temp[0]] = temp[1];_x000D_
});_x000D_
_x000D_
console.log('stringData: '+stringData);_x000D_
console.log('newData: ');_x000D_
console.log(newData);
_x000D_
_x000D_
_x000D_

How do I declare a model class in my Angular 2 component using TypeScript?

create model.ts in your component directory as below

export module DataModel {
       export interface DataObjectName {
         propertyName: type;
        }
       export interface DataObjectAnother {
         propertyName: type;
        }
    }

then in your component import above as, import {DataModel} from './model';

export class YourComponent {
   public DataObject: DataModel.DataObjectName;
}

your DataObject should have all the properties from DataObjectName.

Change the encoding of a file in Visual Studio Code

Apart from the settings explained in the answer by @DarkNeuron:

"files.encoding": "any encoding"

you can also specify settings for a specific language like so:

"[language id]": {
  "files.encoding": "any encoding"
}

For example, I use this when I need to edit PowerShell files previously created with ISE (which are created in ANSI format):

"[powershell]": {
    "files.encoding": "windows1252"
}

You can get a list of identifiers of well-known languages here.

C# Switch-case string starting with

This is now possible with C# 7.0's pattern matching. For example:

var myString = "abcDEF";

switch(myString)
{
    case string x when x.StartsWith("abc"):
        //Do something here
        break;
}

SQL Error with Order By in Subquery

If building a temp table, move the ORDER BY clause from inside the temp table code block to the outside.

Not allowed:

SELECT * FROM (
SELECT A FROM Y
ORDER BY Y.A
) X;

Allowed:

SELECT * FROM (
SELECT A FROM Y
) X
ORDER BY X.A;

How to set selected value on select using selectpicker plugin from bootstrap

The value is correctly selected, but you didn't see it because the plugin hide the real select and show a button with an unordered list, so, if you want that the user see the selected value on the select you can do something like this:

//Get the text using the value of select
var text = $("select[name=selValue] option[value='1']").text();
//We need to show the text inside the span that the plugin show
$('.bootstrap-select .filter-option').text(text);
//Check the selected attribute for the real select
$('select[name=selValue]').val(1);

Edit:

Like @blushrt points out, a better solution is:

$('select[name=selValue]').val(1);
$('.selectpicker').selectpicker('refresh')

Edit 2:

To select multiple values, pass the values as an array.

How to switch activity without animation in Android?

This is not an example use or an explanation of how to use FLAG_ACTIVITY_NO_ANIMATION, however it does answer how to disable the Activity switching animation, as asked in the question title:

Android, how to disable the 'wipe' effect when starting a new activity?

How to upgrade docker-compose to latest version

Based on @eric-johnson's answer, I'm currently using this in a script:

#!/bin/bash
compose_version=$(curl https://api.github.com/repos/docker/compose/releases/latest | jq .name -r)
output='/usr/local/bin/docker-compose'
curl -L https://github.com/docker/compose/releases/download/$compose_version/docker-compose-$(uname -s)-$(uname -m) -o $output
chmod +x $output
echo $(docker-compose --version)

it grabs the latest version from the GitHub api.

Iterate over object keys in node.js

For simple iteration of key/values, sometimes libraries like underscorejs can be your friend.

const _ = require('underscore');

_.each(a, function (value, key) {
    // handle
});

just for reference

How to add google-play-services.jar project dependency so my project will run and present map

Be Careful, Follow these steps and save your time

  1. Right Click on your Project Explorer.

  2. Select New-> Project -> Android Application Project from Existing Code

  3. Browse upto this path only - "C:\Users**your path**\Local\Android\android-sdk\extras\google\google_play_services"

  4. Be careful brose only upto - google_play_services and not upto google_play_services_lib

  5. And this way you are able to import the google play service lib.

Let me know if you have any queries regarding the same.

Thanks

error LNK2005, already defined?

And if you want these translation units to share this variable, define int k; in A.cpp and put extern int k; in B.cpp.

How to store command results in a shell variable?

The syntax to store the command output into a variable is var=$(command).

So you can directly do:

result=$(ls -l | grep -c "rahul.*patle")

And the variable $result will contain the number of matches.

How do I modify fields inside the new PostgreSQL JSON datatype?

I wrote small function for myself that works recursively in Postgres 9.4. Here is the function (I hope it works well for you):

CREATE OR REPLACE FUNCTION jsonb_update(val1 JSONB,val2 JSONB)
RETURNS JSONB AS $$
DECLARE
    result JSONB;
    v RECORD;
BEGIN
    IF jsonb_typeof(val2) = 'null'
    THEN 
        RETURN val1;
    END IF;

    result = val1;

    FOR v IN SELECT key, value FROM jsonb_each(val2) LOOP

        IF jsonb_typeof(val2->v.key) = 'object'
            THEN
                result = result || jsonb_build_object(v.key, jsonb_update(val1->v.key, val2->v.key));
            ELSE
                result = result || jsonb_build_object(v.key, v.value);
        END IF;
    END LOOP;

    RETURN result;
END;
$$ LANGUAGE plpgsql;

Here is sample use:

select jsonb_update('{"a":{"b":{"c":{"d":5,"dd":6},"cc":1}},"aaa":5}'::jsonb, '{"a":{"b":{"c":{"d":15}}},"aa":9}'::jsonb);
                            jsonb_update                             
---------------------------------------------------------------------
 {"a": {"b": {"c": {"d": 15, "dd": 6}, "cc": 1}}, "aa": 9, "aaa": 5}
(1 row)

As you can see it analyze deep down and update/add values where needed.

alert a variable value

If you're using greasemonkey, it's possible the page isn't ready for the javascript yet. You may need to use window.onReady.

var inputs;

function doThisWhenReady() {
    inputs = document.getElementsByTagName('input');

    //Other code here...
}

window.onReady = doThisWhenReady;

How do I show the changes which have been staged?

For Staging Area vs Repository(last commit) comparison use

 $git diff --staged

The command compares your staged($ git add fileName) changes to your last commit. If you want to see what you’ve staged that will go into your next commit, you can use git diff --staged. This command compares your staged changes to your last commit.

For Working vs Staging comparison use

$ git diff 

The command compares what is in your working directory with what is in your staging area. It’s important to note that git diff by itself doesn’t show all changes made since your last commit — only changes that are still unstaged. If you’ve staged all of your changes($ git add fileName), git diff will give you no output.

Also, if you stage a file($ git add fileName) and then edit it, you can use git diff to see the changes in the file that are staged and the changes that are unstaged.

Java: Check if command line arguments are null

@jjnguy's answer is correct in most circumstances. You won't ever see a null String in the argument array (or a null array) if main is called by running the application is run from the command line in the normal way.

However, if some other part of the application calls a main method, it is conceivable that it might pass a null argument or null argument array.

However(2), this is clearly a highly unusual use-case, and it is an egregious violation of the implied contract for a main entry-point method. Therefore, I don't think you should bother checking for null argument values in main. In the unlikely event that they do occur, it is acceptable for the calling code to get a NullPointerException. After all, it is a bug in the caller to violate the contract.

How to check java bit version on Linux?

Works for every binary, not only java:

file - < $(which java) # heavyly bashic

cat `which java` | file - # universal

Activate a virtualenv with a Python script

You should create all your virtualenvs in one folder, such as virt.

Assuming your virtualenv folder name is virt, if not change it

cd
mkdir custom

Copy the below lines...

#!/usr/bin/env bash
ENV_PATH="$HOME/virt/$1/bin/activate"
bash --rcfile $ENV_PATH -i

Create a shell script file and paste the above lines...

touch custom/vhelper
nano custom/vhelper

Grant executable permission to your file:

sudo chmod +x custom/vhelper

Now export that custom folder path so that you can find it on the command-line by clicking tab...

export PATH=$PATH:"$HOME/custom"

Now you can use it from anywhere by just typing the below command...

vhelper YOUR_VIRTUAL_ENV_FOLDER_NAME

Suppose it is abc then...

vhelper abc