How to close form

new WindowSettings();

You just closed a brand new instance of the form that wasn't visible in the first place.

You need to close the original instance of the form by accepting it as a constructor parameter and storing it in a field.

Launch Android application without main Activity and start Service on launching application

The reason to make an App with no activity or service could be making a Homescreen Widget app that doesn't need to be started.
Once you start a project don't create any activities. After you created the project just hit run. Android studio will say No default activity found.

Click Edit Configuration (From the Run menu) and in the Launch option part set the Launch value to Nothing. Then click ok and run the App.

(Since there is no launcher activity, No app will be show in the Apps menu.).

What's the difference between "Layers" and "Tiers"?

Technically a Tier can be a kind of minimum environment required for the code to run.

E.g. hypothetically a 3-tier app can be running on

3 physical machines with no OS .
1 physical machine with 3 virtual machines with no OS.

(That was a 3-(hardware)tier app)
1 physical machine with 3 virtual machines with 3 different/same OSes

(That was a 3-(OS)tier app)
1 physical machine with 1 virtual machine with 1 OS but 3 AppServers

(That was a 3-(AppServer)tier app)
1 physical machine with 1 virtual machine with 1 OS with 1 AppServer but 3 DBMS

(That was a 3-(DBMS)tier app)
1 physical machine with 1 virtual machine with 1 OS with 1 AppServers and 1 DBMS but 3 Excel workbooks.

(That was a 3-(AppServer)tier app)

Excel workbook is the minimum required environment for VBA code to run.

Those 3 workbooks can sit on a single physical computer or multiple.

I have noticed that in practice people mean "OS Tier" when they say "Tier" in the app description context.

That is if an app runs on 3 separate OS then its a 3-Tier app.

So a pedantically correct way describing an app would be

"1-to-3-Tier capable, running on 2 Tiers" app.

Layers are just types of code in respect to the functional separation of duties withing the app (e.g. Presentation, Data , Security etc.)

Invariant Violation: _registerComponent(...): Target container is not a DOM element

By the time script is executed, document element is not available yet, because script itself is in the head. While it's a valid solution to keep script in head and render on DOMContentLoaded event, it's even better to put your script at the very bottom of the body and render root component to a div before it like this:

<html>
<head>
</head>
<body>
  <div id="root"></div>
  <script src="/bundle.js"></script>
</body>
</html>

and in the bundle.js, call:

React.render(<App />, document.getElementById('root'));

You should always render to a nested div instead of body. Otherwise, all sorts of third-party code (Google Font Loader, browser plugins, whatever) can modify the body DOM node when React doesn't expect it, and cause weird errors that are very hard to trace and debug. Read more about this issue.

The nice thing about putting script at the bottom is that it won't block rendering until script load in case you add React server rendering to your project.

Update: (October 07, 2015 | v0.14)

React.render is deprecated, use ReactDOM.render instead.

Example:

import ReactDOM from 'react-dom';

ReactDOM.render(<App />, document.getElementById('root'));

Transfer data from one database to another database

These solutions are working in case when target database is blank. In case when both databases already have some data you need something more complicated http://byalexblog.net/merge-sql-databases

Python Pandas iterate over rows and access column names

This was not as straightforward as I would have hoped. You need to use enumerate to keep track of how many columns you have. Then use that counter to look up the name of the column. The accepted answer does not show you how to access the column names dynamically.

for row in df.itertuples(index=False, name=None):
    for k,v in enumerate(row):
        print("column: {0}".format(df.columns.values[k]))
        print("value: {0}".format(v)

Get value of div content using jquery

$('#field-function_purpose') will get you the element with ID field-function_purpose, which is your div element. text() returns you the content of the div.

var x = $('#field-function_purpose').text();

What is the meaning of the word logits in TensorFlow?

Summary

In context of deep learning the logits layer means the layer that feeds in to softmax (or other such normalization). The output of the softmax are the probabilities for the classification task and its input is logits layer. The logits layer typically produces values from -infinity to +infinity and the softmax layer transforms it to values from 0 to 1.

Historical Context

Where does this term comes from? In 1930s and 40s, several people were trying to adapt linear regression to the problem of predicting probabilities. However linear regression produces output from -infinity to +infinity while for probabilities our desired output is 0 to 1. One way to do this is by somehow mapping the probabilities 0 to 1 to -infinity to +infinity and then use linear regression as usual. One such mapping is cumulative normal distribution that was used by Chester Ittner Bliss in 1934 and he called this "probit" model, short for "probability unit". However this function is computationally expensive while lacking some of the desirable properties for multi-class classification. In 1944 Joseph Berkson used the function log(p/(1-p)) to do this mapping and called it logit, short for "logistic unit". The term logistic regression derived from this as well.

The Confusion

Unfortunately the term logits is abused in deep learning. From pure mathematical perspective logit is a function that performs above mapping. In deep learning people started calling the layer "logits layer" that feeds in to logit function. Then people started calling the output values of this layer "logit" creating the confusion with logit the function.

TensorFlow Code

Unfortunately TensorFlow code further adds in to confusion by names like tf.nn.softmax_cross_entropy_with_logits. What does logits mean here? It just means the input of the function is supposed to be the output of last neuron layer as described above. The _with_logits suffix is redundant, confusing and pointless. Functions should be named without regards to such very specific contexts because they are simply mathematical operations that can be performed on values derived from many other domains. In fact TensorFlow has another similar function sparse_softmax_cross_entropy where they fortunately forgot to add _with_logits suffix creating inconsistency and adding in to confusion. PyTorch on the other hand simply names its function without these kind of suffixes.

Reference

The Logit/Probit lecture slides is one of the best resource to understand logit. I have also updated Wikipedia article with some of above information.

Location of GlassFish Server Logs

In general the logs are in /YOUR_GLASSFISH_INSTALL/glassfish/domains/domain1/logs/.

In NetBeans go to the "Services" tab open "Servers", right-click on your Glassfish instance and click "View Domain Server Log".

If this doesn't work right-click on the Glassfish instance and click "Properties", you can see the folder with the domains under "Domains folder". Go to this folder -> your-domain -> logs

If the server is already running you should see an Output tab in NetBeans which is named similar to GlassFish Server x.x.x

You can also use cat or tail -F on /YOUR_GLASSFISH_INSTALL/glassfish/domains/domain1/logs/server.log. If you are using a different domain then domain1 you have to adjust the path for that.

Proper way to catch exception from JSON.parse

This promise will not resolve if the argument of JSON.parse() can not be parsed into a JSON object.

Promise.resolve(JSON.parse('{"key":"value"}')).then(json => {
    console.log(json);
}).catch(err => {
    console.log(err);
});

Function Pointers in Java

No, functions are not first class objects in java. You can do the same thing by implementing a handler class - this is how callbacks are implemented in the Swing etc.

There are however proposals for closures (the official name for what you're talking about) in future versions of java - Javaworld has an interesting article.

Merge (with squash) all changes from another branch as a single commit

Found it! Merge command has a --squash option

git checkout master
git merge --squash WIP

at this point everything is merged, possibly conflicted, but not committed. So I can now:

git add .
git commit -m "Merged WIP"

How to fix: fatal error: openssl/opensslv.h: No such file or directory in RedHat 7

For Alpine Linux:

apk add openssl-dev

Face recognition Library

We're using OpenCV. It has lots of non-face-recognition stuff in there also, but, rest assured, it does do face-recognition.

Nested rows with bootstrap grid system?

Adding to what @KyleMit said, consider using:

col-md-* classes for the larger outer columns
col-xs-* classes for the smaller inner columns

This will be useful when you view the page on different screen sizes.

On a small screen, the wrapping of larger outer columns will then happen while maintaining the smaller inner columns, if possible

How to pass a value from one Activity to another in Android?

Its simple If you are passing String X from A to B.
A--> B

In Activity A
1) Create Intent
2) Put data in intent using putExtra method of intent
3) Start activity

Intent i = new Intent(A.this, B.class);
i.putExtra("MY_kEY",X);

In Activity B
inside onCreate method
1) Get intent object
2) Get stored value using key(MY_KEY)

Intent intent = getIntent();
String result = intent.getStringExtra("MY_KEY");

This is the standard way to send data from A to B. you can send any data type, it could be int, boolean, ArrayList, String[]. Based on the datatype you stored in Activity as key, value pair retrieving method might differ like if you are passing int value then you will call

intent.getIntExtra("KEY");

You can even send Class objects too but for that, you have to make your class object implement the Serializable or Parceable interface.

TransactionTooLargeException

How much data you can send across size. If data exceeds a certain amount in size then you might get TransactionTooLargeException. Suppose you are trying to send bitmap across the activity and if the size exceeds certain data size then you might see this exception.

Run PHP Task Asynchronously

If you don't want the full blown ActiveMQ, I recommend to consider RabbitMQ. RabbitMQ is lightweight messaging that uses the AMQP standard.

I recommend to also look into php-amqplib - a popular AMQP client library to access AMQP based message brokers.

Get list of certificates from the certificate store in C#

X509Store store = new X509Store(StoreName.My, StoreLocation.LocalMachine);

store.Open(OpenFlags.ReadOnly);

foreach (X509Certificate2 certificate in store.Certificates){
    //TODO's
}

subsetting a Python DataFrame

Creating an Empty Dataframe with known Column Name:

Names = ['Col1','ActivityID','TransactionID']
df = pd.DataFrame(columns = Names)

Creating a dataframe from csv:

df = pd.DataFrame('...../file_name.csv')

Creating a dynamic filter to subset a dtaframe:

i = 12
df[df['ActivitiID'] <= i]

Creating a dynamic filter to subset required columns of dtaframe

df[df['ActivityID'] == i][['TransactionID','ActivityID']]

How do I change the background of a Frame in Tkinter?

You use ttk.Frame, bg option does not work for it. You should create style and apply it to the frame.

from tkinter import *
from tkinter.ttk import * 

root = Tk()

s = Style()
s.configure('My.TFrame', background='red')

mail1 = Frame(root, style='My.TFrame')
mail1.place(height=70, width=400, x=83, y=109)
mail1.config()
root.mainloop()

In Bash, how can I check if a string begins with some value?

I prefer the other methods already posted, but some people like to use:

case "$HOST" in 
    user1|node*) 
            echo "yes";;
        *)
            echo "no";;
esac

Edit:

I've added your alternates to the case statement above

In your edited version you have too many brackets. It should look like this:

if [[ $HOST == user1 || $HOST == node* ]];

How to parse a JSON file in swift?

Install Swifty Json

Note: if you are looking for this, there's also a high chance you don't know how to install swifty. Follow the instructions here.

sudo gem install cocoapods

cd ~/Path/To/Folder/Containing/ShowTracker

Next enter this command:

pod init

This will create a default Podfile for your project. The Podfile is where you define the dependencies your project relies on.

Type this command to open Podfile using Xcode for editing:

open -a Xcode Podfile

Add the Swifty into the podfile

platform :ios, '8.0'
use_frameworks!

target 'MyApp' do
    pod 'SwiftyJSON', '~> X.X.X'
end

Check this example

var mURL = NSURL(string: "http://api.openweathermap.org/data/2.5/weather?q=London,uk&units=metric")

if mURL == nil{
    println("You are stupid")
    return
}

var request = NSURLRequest(URL: mURL!)

NSURLConnection.sendAsynchronousRequest(
    request,
    queue: NSOperationQueue.mainQueue(),
    completionHandler:{ (
        response: NSURLResponse!, 
        data: NSData!, 
        error: NSError!) -> Void in

    if data != nil {

        var mJSON = JSON(data: data!)

        if let current_conditions = mJSON["weather"][0]["description"].string {
            println("Current conditions: " + current_conditions)
        } else {
            println("MORON!")
        }

        if let current_temperature = mJSON["main"]["temp"].double {
            println("Temperature: "+ String(format:"%.f", current_temperature)  + "°C"
        } else {
            println("MORON!")
        }
    }
})

Download image with JavaScript

As @Ian explained, the problem is that jQuery's click() is not the same as the native one.

Therefore, consider using vanilla-js instead of jQuery:

var a = document.createElement('a');
a.href = "img.png";
a.download = "output.png";
document.body.appendChild(a);
a.click();
document.body.removeChild(a);

Demo

MISCONF Redis is configured to save RDB snapshots

Had encountered this error and was able to figure out from log that the error is because of the disk space not being enough. All the data that was inserted in my case was not needed any longer. So I tried to FLUSHALL. Since redis-rdb-bgsave process was running, it was not allowing to FLUSH the data also. I followed below steps and was able to continue.

Login to redis client
Execute config set stop-writes-on-bgsave-error no
Execute FLUSHALL (Data stored was not needed)
Execute config set stop-writes-on-bgsave-error yes

The process redis-rdb-bgsave was no longer running after the above steps.

How to generate keyboard events?

For Python2.7(windows32) I installed only pywin32-223. And I wrote simple python`s code:

import win32api
import time
import win32con

# simulate the pressing-DOWN "ARROW key" of 200 times

for i in range(200):
   time.sleep(0.5)
   win32api.keybd_event(0x28, 0,0,0)
   time.sleep(.05)
   win32api.keybd_event(0x28,0 ,win32con.KEYEVENTF_KEYUP ,0)

It can be checked if you run the code and immediately go to the notepad window (where the text already exists) and place the cursor on the top line.

Twitter bootstrap remote modal shows same content every time

This other approach works well for me:

$("#myModal").on("show.bs.modal", function(e) {
    var link = $(e.relatedTarget);
    $(this).find(".modal-body").load(link.attr("href"));
});

What are the calling conventions for UNIX & Linux system calls (and user-space functions) on i386 and x86-64

Calling conventions defines how parameters are passed in the registers when calling or being called by other program. And the best source of these convention is in the form of ABI standards defined for each these hardware. For ease of compilation, the same ABI is also used by userspace and kernel program. Linux/Freebsd follow the same ABI for x86-64 and another set for 32-bit. But x86-64 ABI for Windows is different from Linux/FreeBSD. And generally ABI does not differentiate system call vs normal "functions calls". Ie, here is a particular example of x86_64 calling conventions and it is the same for both Linux userspace and kernel: http://eli.thegreenplace.net/2011/09/06/stack-frame-layout-on-x86-64/ (note the sequence a,b,c,d,e,f of parameters):

Performance is one of the reasons for these ABI (eg, passing parameters via registers instead of saving into memory stacks)

For ARM there is various ABI:

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.subset.swdev.abi/index.html

https://developer.apple.com/library/ios/documentation/Xcode/Conceptual/iPhoneOSABIReference/iPhoneOSABIReference.pdf

ARM64 convention:

http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055b/IHI0055B_aapcs64.pdf

For Linux on PowerPC:

http://refspecs.freestandards.org/elf/elfspec_ppc.pdf

http://www.0x04.net/doc/elf/psABI-ppc64.pdf

And for embedded there is the PPC EABI:

http://www.freescale.com/files/32bit/doc/app_note/PPCEABI.pdf

This document is good overview of all the different conventions:

http://www.agner.org/optimize/calling_conventions.pdf

PHP - Move a file into a different folder on the server

If you want to move the file in new path with keep original file name. use this:

$source_file = 'foo/image.jpg';
$destination_path = 'bar/';
rename($source_file, $destination_path . pathinfo($source_file, PATHINFO_BASENAME));

What is the maximum length of a table name in Oracle?

Oracle database object names maximum length is 30 bytes.

Object Name Rules: http://docs.oracle.com/database/121/SQLRF/sql_elements008.htm

Measure the time it takes to execute a t-sql query

If you want a more accurate measurement than the answer above:

set statistics time on 

-- Query 1 goes here

-- Query 2 goes here

set statistics time off

The results will be in the Messages window.

Update (2015-07-29):

By popular request, I have written a code snippet that you can use to time an entire stored procedure run, rather than its components. Although this only returns the time taken by the last run, there are additional stats returned by sys.dm_exec_procedure_stats that may also be of value:

-- Use the last_elapsed_time from sys.dm_exec_procedure_stats
-- to time an entire stored procedure.

-- Set the following variables to the name of the stored proc
-- for which which you would like run duration info
DECLARE @DbName NVARCHAR(128);
DECLARE @SchemaName SYSNAME;
DECLARE @ProcName SYSNAME=N'TestProc';

SELECT CONVERT(TIME(3),DATEADD(ms,ROUND(last_elapsed_time/1000.0,0),0)) 
       AS LastExecutionTime
FROM sys.dm_exec_procedure_stats
WHERE OBJECT_NAME(object_id,database_id)=@ProcName AND
      (OBJECT_SCHEMA_NAME(object_id,database_id)=@SchemaName OR @SchemaName IS NULL) AND
      (DB_NAME(database_id)=@DbName OR @DbName IS NULL)

Javascript Debugging line by line using Google Chrome

Assuming you're running on a Windows machine...

Hit the F12 key
Select the Scripts, or Sources, tab in the developer tools
Click the little folder icon in the top level
Select your JavaScript file
Add a breakpoint by clicking on the line number on the left (adds a little blue marker)
Execute your JavaScript

Then during execution debugging you can do a handful of stepping motions...

F8 Continue: Will continue until the next breakpoint
F10 Step over: Steps over next function call (won't enter the library)
F11 Step into: Steps into the next function call (will enter the library)
Shift + F11 Step out: Steps out of the current function

Update

After reading your updated post; to debug your code I would recommend temporarily using the jQuery Development Source Code. Although this doesn't directly solve your problem, it will allow you to debug more easily. For what you're trying to achieve I believe you'll need to step-in to the library, so hopefully the production code should help you decipher what's happening.

Xcode Debugger: view value of variable

Your confusion stems from the fact that declared properties are not (necessarily named the same as) (instance) variables.

The expresion

indexPath.row

is equivalent to

[indexPath row]

and the assignment

delegate.myData = [myData objectAtIndex:indexPath.row];

is equivalent to

[delegate setMyData:[myData objectAtIndex:[indexPath row]]];

assuming standard naming for synthesised properties.

Furthermore, delegate is probably declared as being of type id<SomeProtocol>, i.e., the compiler hasn’t been able to provide actual type information for delegate at that point, and the debugger is relying on information provided at compile-time. Since id is a generic type, there’s no compile-time information about the instance variables in delegate.

Those are the reasons why you don’t see myData or row as variables.

If you want to inspect the result of sending -row or -myData, you can use commands p or po:

p (NSInteger)[indexPath row]
po [delegate myData]

or use the expressions window (for instance, if you know your delegate is of actual type MyClass *, you can add an expression (MyClass *)delegate, or right-click delegate, choose View Value as… and type the actual type of delegate (e.g. MyClass *).

That being said, I agree that the debugger could be more helpful:

There could be an option to tell the debugger window to use run-time type information instead of compile-time information. It'd slow down the debugger, granted, but would provide useful information;
Declared properties could be shown up in a group called properties and allow for (optional) inspection directly in the debugger window. This would also slow down the debugger because of the need to send a message/execute a method in order to get information, but would provide useful information, too.

Update statement using with clause

You can always do something like this:

update  mytable t
set     SomeColumn = c.ComputedValue
from    (select *, 42 as ComputedValue from mytable where id = 1) c
where t.id = c.id

You can now also use with statement inside update

update  mytable t
set     SomeColumn = c.ComputedValue
from    (with abc as (select *, 43 as ComputedValue_new from mytable where id = 1
         select *, 42 as ComputedValue, abc.ComputedValue_new  from mytable n1
           inner join abc on n1.id=abc.id) c
where t.id = c.id

Styling text input caret

In CSS3, there is now a native way to do this, without any of the hacks suggested in the existing answers: the caret-color property.

There are a lot of things you can do to with the caret, as seen below. It can even be animated.

/* Keyword value */
caret-color: auto;
color: transparent;
color: currentColor;

/* <color> values */
caret-color: red;
caret-color: #5729e9;
caret-color: rgb(0, 200, 0);
caret-color: hsla(228, 4%, 24%, 0.8);

The caret-color property is supported from Firefox 55, and Chrome 60. Support is also available in the Safari Technical Preview and in Opera (but not yet in Edge). You can view the current support tables here.

How to get row index number in R?

Perhaps this complementary example of "match" would be helpful.

Having two datasets:

first_dataset <- data.frame(name = c("John", "Luke", "Simon", "Gregory", "Mary"),
                            role = c("Audit", "HR", "Accountant", "Mechanic", "Engineer"))

second_dataset <- data.frame(name = c("Mary", "Gregory", "Luke", "Simon"))

If the name column contains only unique across collection values (across whole collection) then you can access row in other dataset by value of index returned by match

name_mapping <- match(second_dataset$name, first_dataset$name)

match returns proper row indexes of names in first_dataset from given names from second: 5 4 2 1 example here - accesing roles from first dataset by row index (by given name value)

for(i in 1:length(name_mapping)) {
    role <- as.character(first_dataset$role[name_mapping[i]])   
    second_dataset$role[i] = role
}

===

second dataset with new column:
     name       role
1    Mary   Engineer
2 Gregory   Mechanic
3    Luke Supervisor
4   Simon Accountant

Action Image MVC3 Razor

This turned out to be a very useful thread.

For those who are allergic to curly braces, here is the VB.NET version of Lucas' and Crake's answers:

Public Module ActionImage
    <System.Runtime.CompilerServices.Extension()>
    Function ActionImage(html As HtmlHelper, Action As String, RouteValues As Object, ImagePath As String, AltText As String) As MvcHtmlString

        Dim url = New UrlHelper(html.ViewContext.RequestContext)

        Dim imgHtml As String
        'Build the <img> tag
        Dim imgBuilder = New TagBuilder("img")
        With imgBuilder
            .MergeAttribute("src", url.Content(ImagePath))
            .MergeAttribute("alt", AltText)
            imgHtml = .ToString(TagRenderMode.Normal)
        End With

        Dim aHtml As String
        'Build the <a> tag
        Dim aBuilder = New TagBuilder("a")
        With aBuilder
            .MergeAttribute("href", url.Action(Action, RouteValues))
            .InnerHtml = imgHtml 'Include the <img> tag inside
            aHtml = aBuilder.ToString(TagRenderMode.Normal)
        End With

        Return MvcHtmlString.Create(aHtml)

    End Function

    <Extension()>
    Function ActionImage(html As HtmlHelper, Action As String, Controller As String, RouteValues As Object, ImagePath As String, AltText As String) As MvcHtmlString

        Dim url = New UrlHelper(html.ViewContext.RequestContext)

        Dim imgHtml As String
        'Build the <img> tag
        Dim imgBuilder = New TagBuilder("img")
        With imgBuilder
            .MergeAttribute("src", url.Content(ImagePath))
            .MergeAttribute("alt", AltText)
            imgHtml = .ToString(TagRenderMode.Normal)
        End With

        Dim aHtml As String
        'Build the <a> tag
        Dim aBuilder = New TagBuilder("a")
        With aBuilder
            .MergeAttribute("href", url.Action(Action, Controller, RouteValues))
            .InnerHtml = imgHtml 'Include the <img> tag inside
            aHtml = aBuilder.ToString(TagRenderMode.Normal)
        End With

        Return MvcHtmlString.Create(aHtml)

    End Function

End Module

In Perl, how can I concisely check if a $variable is defined and contains a non zero length string?

The excellent library Type::Tiny provides an framework with which to build type-checking into your Perl code. What I show here is only the thinnest tip of the iceberg and is using Type::Tiny in the most simplistic and manual way.

Be sure to check out the Type::Tiny::Manual for more information.

use Types::Common::String qw< NonEmptyStr >;

if ( NonEmptyStr->check($name) ) {
    # Do something here.
}

NonEmptyStr->($name);  # Throw an exception if validation fails

How do you make div elements display inline?

You need to contain the three divs. Here is an example:

CSS

div.contain
{
  margin:3%;
  border: none;
  height: auto;
  width: auto;
  float: left;
}

div.contain div
{
  display:inline;
  width:200px;
  height:300px;
  padding: 15px;
  margin: auto;
  border:1px solid red;
  background-color:#fffff7;
  -moz-border-radius:25px; /* Firefox */
  border-radius:25px;
}

Note: border-radius attributes are optional and only work in CSS3 compliant browsers.

HTML

<div class="contain">
  <div>Foo</div>
</div>

<div class="contain">
  <div>Bar</div>
</div>

<div class="contain">
  <div>Baz</div>
</div>

Note that the divs 'foo' 'bar' and 'baz' are each held within the 'contain' div.

Select where count of one field is greater than one

For me, Not having a group by just returned empty result. So i guess having a group by for the having statement is pretty important

What is the point of "final class" in Java?

If you imagine the class hierarchy as a tree (as it is in Java), abstract classes can only be branches and final classes are those that can only be leafs. Classes that fall into neither of those categories can be both branches and leafs.

There's no violation of OO principles here, final is simply providing a nice symmetry.

In practice you want to use final if you want your objects to be immutable or if you're writing an API, to signal to the users of the API that the class is just not intended for extension.

jQuery Uncaught TypeError: Cannot read property 'fn' of undefined (anonymous function)

I fixed it by added the jquery.slim.min.js after the jquery.min.js, as the Solution Sequence.

Problem Sequence

<script src="./vendor/jquery/jquery.min.js"></script>
<script src="./vendor/bootstrap/js/bootstrap.bundle.min.js"></script>

Solution Sequence

<script src="./vendor/jquery/jquery.min.js"></script>
<script src="./vendor/jquery/jquery.slim.min.js"></script>
<script src="./vendor/jquery-easing/jquery.easing.min.js"></script>

"python" not recognized as a command

You can do it in python installer:

What is "not assignable to parameter of type never" error in typescript?

I was having same error In ReactJS statless function while using ReactJs Hook useState. I wanted to set state of an object array , so if I use the following way

const [items , setItems] = useState([]);

and update the state like this:

 const item = { id : new Date().getTime() , text : 'New Text' };
 setItems([ item , ...items ]);

I was getting error:

Argument of type '{ id: number; text: any }' is not assignable to parameter of type 'never'

but if do it like this,

const [items , setItems] = useState([{}]);

Error is gone but there is an item at 0 index which don't have any data(don't want that).

so the solution I found is:

const [items , setItems] = useState([] as any);

Why is my Spring @Autowired field null?

If this is happening in a test class, make sure you haven't forgotten to annotate the class.

For example, in Spring Boot:

@RunWith(SpringRunner.class)
@SpringBootTest
public class MyTests {
    ....

Some time elapses...

Spring Boot continues to evolve. It is no longer required to use @RunWith if you use the correct version of JUnit.

For @SpringBootTest to work stand alone, you need to use @Test from JUnit5 instead of JUnit4.

//import org.junit.Test; // JUnit4
import org.junit.jupiter.api.Test; // JUnit5

@SpringBootTest
public class MyTests {
    ....

If you get this configuration wrong your tests will compile, but @Autowired and @Value fields (for example) will be null. Since Spring Boot operates by magic, you may have few avenues for directly debugging this failure.

Send array with Ajax to PHP script

dataString suggests the data is formatted in a string (and maybe delimted by a character).

$data = explode(",", $_POST['data']);
foreach($data as $d){
     echo $d;
}

if dataString is not a string but infact an array (what your question indicates) use JSON.

How to urlencode data for curl command?

Use Perl's URI::Escape module and uri_escape function in the second line of your bash script:

...

value="$(perl -MURI::Escape -e 'print uri_escape($ARGV[0]);' "$2")"
...

Edit: Fix quoting problems, as suggested by Chris Johnsen in the comments. Thanks!

How can I pass a parameter in Action?

You're looking for Action<T>, which takes a parameter.

Need to get current timestamp in Java

String.format("{0:dddd, MMMM d, yyyy hh:mm tt}", dt);

MongoDB Show all contents from all collections

Once you are in terminal/command line, access the database/collection you want to use as follows:

show dbs
use <db name>
show collections

choose your collection and type the following to see all contents of that collection:

db.collectionName.find()

More info here on the MongoDB Quick Reference Guide.

How to fill a datatable with List<T>

Just in case you have a nullable property in your class object:

private static DataTable ConvertToDatatable<T>(List<T> data)
{
    PropertyDescriptorCollection props = TypeDescriptor.GetProperties(typeof(T));
    DataTable table = new DataTable();
    for (int i = 0; i < props.Count; i++)
    {
        PropertyDescriptor prop = props[i];
        if (prop.PropertyType.IsGenericType && prop.PropertyType.GetGenericTypeDefinition() == typeof(Nullable<>))
            table.Columns.Add(prop.Name, prop.PropertyType.GetGenericArguments()[0]); 
        else
            table.Columns.Add(prop.Name, prop.PropertyType);
    }

    object[] values = new object[props.Count];
    foreach (T item in data)
    {
        for (int i = 0; i < values.Length; i++)
        {
            values[i] = props[i].GetValue(item);
        }
        table.Rows.Add(values);
    }
    return table;
 }

Conflict with dependency 'com.android.support:support-annotations'. Resolved versions for app (23.1.0) and test app (23.0.1) differ

Source: CodePath - UI Testing With Espresso

Finally, we need to pull in the Espresso dependencies and set the test runner in our app build.gradle:

// build.gradle
...
android {
    ...
    defaultConfig {
        ...
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
}

dependencies {
    ...
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2') {
        // Necessary if your app targets Marshmallow (since Espresso
        // hasn't moved to Marshmallow yet)
        exclude group: 'com.android.support', module: 'support-annotations'
    }
    androidTestCompile('com.android.support.test:runner:0.5') {
        // Necessary if your app targets Marshmallow (since the test runner
        // hasn't moved to Marshmallow yet)
        exclude group: 'com.android.support', module: 'support-annotations'
    }
}

I've added that to my gradle file and the warning disappeared.

Also, if you get any other dependency listed as conflicting, such as support-annotations, try excluding it too from the androidTestCompile dependencies.

Vue.js data-bind style backgroundImage not working

<div :style="{ backgroundImage: `url(${post.image})` }">

there are multiple ways but i found template string easy and simple

EC2 Instance Cloning

To Answer your question: now AWS make cloning real easy see Launch instance from your Existing Instance

On the EC2 Instances page, select the instance you want to use
Choose Actions, and then Launch More Like This.
Review & Launch

This will take the existing instance as a Template for the new once.

or you can also take a snapshot of the existing volume and use the snapshot with the AMI (existing one) which you ping during your instance launch

Error in contrasts when defining a linear model in R

This is a variation to the answer provided by @Metrics and edited by @Max Ghenis...

l <- sapply(iris, function(x) is.factor(x))
m <- iris[,l]

n <- sapply( m, function(x) { y <- summary(x)/length(x)
len <- length(y[y<0.005 | y>0.995])
cbind(len,t(y))} )

drop_cols_df <- data.frame(var = names(l[l]), 
                           status = ifelse(as.vector(t(n[1,]))==0,"NODROP","DROP" ),
                           level1 = as.vector(t(n[2,])),
                           level2 = as.vector(t(n[3,])))

Here, after identifying factor variables, the second sapply computes what percent of records belong to each level / category of the variable. Then it identifies number of levels over 99.5% or below 0.5% incidence rate (my arbitrary thresholds).

It then goes on to return the number of valid levels and the incidence rate of each level in each categorical variable.

Variables with zero levels crossing the thresholds should not be dropped, while the other should be dropped from the linear model.

The last data frame makes viewing the results easy. It's hard coded for this data set since all factor variables are binomial. This data frame can be made generic easily enough.

How to get filename without extension from file path in Ruby

require 'pathname'

Pathname.new('/opt/local/bin/ruby').basename
# => #<Pathname:ruby>

I haven't been a Windows user in a long time, but the Pathname rdoc says it has no issues with directory-name separators on Windows.

Set value of textbox using JQuery

You're targeting the wrong item with that jQuery selector. The name of your search bar is searchBar, not the id. What you want to use is $('#main_search').val('hi').

Format XML string to print friendly XML string

I tried:

internal static void IndentedNewWSDLString(string filePath)
{
    var xml = File.ReadAllText(filePath);
    XDocument doc = XDocument.Parse(xml);
    File.WriteAllText(filePath, doc.ToString());
}

it is working fine as expected.

How to assign execute permission to a .sh file in windows to be executed in linux

This is not possible. Linux permissions and windows permissions do not translate. They are machine specific. It would be a security hole to allow permissions to be set on files before they even arrive on the target system.

Calling an API from SQL Server stored procedure

I think it would be easier using this CLR Stored procedure SQL-APIConsumer:

 exec [dbo].[APICaller_POST]
     @URL = 'http://localhost:5000/api/auth/login'
    ,@BodyJson = '{"Username":"gdiaz","Password":"password"}'

It has multiple procedures that allows you calling API that required a parameters and even passing multiples headers and tokens authentications.

Call PHP function from jQuery?

Thanks all. I took bits of each of your solutions and made my own.

The final working solution is:

<script type="text/javascript">
    $(document).ready(function(){
        $.ajax({
            url: '<?php bloginfo('template_url'); ?>/functions/twitter.php',
            data: "tweets=<?php echo $ct_tweets; ?>&account=<?php echo $ct_twitter; ?>",
            success: function(data) {
                $('#twitter-loader').remove();
                $('#twitter-container').html(data);
            }
        });
   });
</script>

Is it possible to include one CSS file in another?

The "@import" rule could calls in multiple styles files. These files are called by the browser or User Agent when needed e.g. HTML tags call the CSS.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="EN" dir="ltr">
<head>
<title>Using @import</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<style type="text/css">
@import url("main.css");
</style>
</head>
<body>
</body>
</html>

CSS File "main.css" Contains The Following Syntax:

@import url("fineprint.css") print;
@import url("bluish.css") projection, tv;
@import 'custom.css';
@import url("chrome://communicator/skin/");
@import "common.css" screen, projection;
@import url('landscape.css') screen and (orientation:landscape);

To insert in style element use createTexNode don't use innerHTML but:

<script>
var style = document.createElement('style');
style.setAttribute("type", "text/css");
var textNode = document.createTextNode("
    @import 'fineprint.css' print;
    @import 'bluish.css' projection, tv;
    @import 'custom.css';
    @import 'chrome://communicator/skin/';
    @import 'common.css' screen, projection;
    @import 'landscape.css' screen and (orientation:landscape);
");
style.appendChild(textNode);
</script>

SQL Order By Count

Q. List the name of each show, and the number of different times it has been held. List the show which has been held most often first.

event_id show_id event_name judge_id
0101    01  Dressage        01
0102    01  Jumping         02
0103    01  Led in          01
0201    02  Led in          02
0301    03  Led in          01
0401    04  Dressage        04
0501    05  Dressage        01
0502    05  Flag and Pole   02

Ans:

select event_name, count(show_id) as held_times from event 
group by event_name 
order by count(show_id) desc

Specific Time Range Query in SQL Server

I'm assuming you want all three of those as part of the selection criteria. You'll need a few statements in your where but they will be similar to the link your question contained.

SELECT *
  FROM MyTable
  WHERE [dateColumn] > '3/1/2009' AND [dateColumn] <= DATEADD(day,1,'3/31/2009') 
        --make it inclusive for a datetime type
    AND DATEPART(hh,[dateColumn]) >= 6 AND DATEPART(hh,[dateColumn]) <= 22 
        -- gets the hour of the day from the datetime
    AND DATEPART(dw,[dateColumn]) >= 3 AND DATEPART(dw,[dateColumn]) <= 5 
        -- gets the day of the week from the datetime

Hope this helps.

Column count doesn't match value count at row 1

you missed the comma between two values or column name
you put extra values or an extra column name

Best timing method in C?

High resolution is relative... I was looking at the examples and they mostly cater for milliseconds. However for me it is important to measure microseconds. I have not seen a platform independant solution for microseconds and thought something like the code below will be usefull. I was timing on windows only for the time being and will most likely add a gettimeofday() implementation when doing the same on AIX/Linux.

    #ifdef WIN32
      #ifndef PERFTIME
        #include <windows.h>
        #include <winbase.h>
        #define PERFTIME_INIT unsigned __int64 freq;  QueryPerformanceFrequency((LARGE_INTEGER*)&freq); double timerFrequency = (1.0/freq);  unsigned __int64 startTime;  unsigned __int64 endTime;  double timeDifferenceInMilliseconds;
        #define PERFTIME_START QueryPerformanceCounter((LARGE_INTEGER *)&startTime);
        #define PERFTIME_END QueryPerformanceCounter((LARGE_INTEGER *)&endTime); timeDifferenceInMilliseconds = ((endTime-startTime) * timerFrequency);  printf("Timing %fms\n",timeDifferenceInMilliseconds);
    #define PERFTIME(funct) {unsigned __int64 freq;  QueryPerformanceFrequency((LARGE_INTEGER*)&freq);  double timerFrequency = (1.0/freq);  unsigned __int64 startTime;  QueryPerformanceCounter((LARGE_INTEGER *)&startTime);  unsigned __int64 endTime;  funct; QueryPerformanceCounter((LARGE_INTEGER *)&endTime);  double timeDifferenceInMilliseconds = ((endTime-startTime) * timerFrequency);  printf("Timing %fms\n",timeDifferenceInMilliseconds);}
      #endif
    #else
      //AIX/Linux gettimeofday() implementation here
    #endif

Usage:

PERFTIME(ProcessIntenseFunction());

or

PERFTIME_INIT
PERFTIME_START
ProcessIntenseFunction()
PERFTIME_END

Array initializing in Scala

Additional to Vasil's answer: If you have the values given as a Scala collection, you can write

val list = List(1,2,3,4,5)
val arr = Array[Int](list:_*)
println(arr.mkString)

But usually the toArray method is more handy:

val list = List(1,2,3,4,5)
val arr = list.toArray
println(arr.mkString)

How to implement a ConfigurationSection with a ConfigurationElementCollection

The previous answer is correct but I'll give you all the code as well.

Your app.config should look like this:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
   <configSections>
      <section name="ServicesSection" type="RT.Core.Config.ServiceConfigurationSection, RT.Core"/>
   </configSections>
   <ServicesSection>
      <Services>
         <add Port="6996" ReportType="File" />
         <add Port="7001" ReportType="Other" />
      </Services>
   </ServicesSection>
</configuration>

Your ServiceConfig and ServiceCollection classes remain unchanged.

You need a new class:

public class ServiceConfigurationSection : ConfigurationSection
{
   [ConfigurationProperty("Services", IsDefaultCollection = false)]
   [ConfigurationCollection(typeof(ServiceCollection),
       AddItemName = "add",
       ClearItemsName = "clear",
       RemoveItemName = "remove")]
   public ServiceCollection Services
   {
      get
      {
         return (ServiceCollection)base["Services"];
      }
   }
}

And that should do the trick. To consume it you can use:

ServiceConfigurationSection serviceConfigSection =
   ConfigurationManager.GetSection("ServicesSection") as ServiceConfigurationSection;

ServiceConfig serviceConfig = serviceConfigSection.Services[0];

Wpf DataGrid Add new row

Just simply use this Style of DataGridRow:

<DataGrid.RowStyle>
        <Style TargetType="DataGridRow">
            <Setter Property="IsEnabled" Value="{Binding RelativeSource={RelativeSource Self},Path=IsNewItem,Mode=OneWay}" />
        </Style>
</DataGrid.RowStyle>

How does Java deal with multiple conditions inside a single IF statement

Yes,that is called short-circuiting.

Please take a look at this wikipedia page on short-circuiting

Could not open input file: artisan

First create the project from the following link to create larave 7 project: Create Project

Now you need to enter your project folder using the following command:

cd myproject

Now try to run artisan command, such as, php artisan.

Or it may happen if you didn't install compose. So if you didn't install composer then run composer install and try again artisan command.

java.util.Date and getYear()

Use date format

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date = format.parse(datetime);
SimpleDateFormat df = new SimpleDateFormat("yyyy");
year = df.format(date);

Extension methods must be defined in a non-generic static class

Add keyword static to class declaration:

// this is a non-generic static class
public static class LinqHelper
{
}

How to retrieve unique count of a field using Kibana + Elastic Search

For Kibana 4 go to this answer

This is easy to do with a terms panel:

Adding a terms panel to Kibana

If you want to select the count of distinct IP that are in your logs, you should specify in the field clientip, you should put a big enough number in length (otherwise, it will join different IP under the same group) and specify in the style table. After adding the panel, you will have a table with IP, and the count of that IP:

Table with IP and count

What exactly does a jar file contain?

JD-GUI is a very handy tool for browsing and decompiling JARs

Parsing JSON object in PHP using json_decode

When you json decode , force it to return an array instead of object.

$data = json_decode($json, TRUE); -> // TRUE

This will return an array and you can access the values by giving the keys.

Github: Can I see the number of downloads for a repo?

As mentioned, GitHub API returns downloads count of binary file releases. I developed a little script to easly get downloads count by command line.

Executable directory where application is running from?

You could use the static StartupPath property of the Application class.

Access Tomcat Manager App from different host

For Tomcat v8.5.4 and above, the file <tomcat>/webapps/manager/META-INF/context.xml has been adjusted:

<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>

Change this file to comment the Valve:

<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>

After that, refresh your browser (not need to restart Tomcat), you can see the manager page.

How can I convert an HTML table to CSV?

I'm not sure if there is pre-made library for this, but if you're willing to get your hands dirty with a little Perl, you could likely do something with Text::CSV and HTML::Parser.

SVN checkout the contents of a folder, not the folder itself

Just add a . to it:

svn checkout file:///home/landonwinters/svn/waterproject/trunk .

That means: check out to current directory.

Using str_replace so that it only acts on the first match?

I created this little function that replaces string on string (case-sensitive) with limit, without the need of Regexp. It works fine.

function str_replace_limit($search, $replace, $string, $limit = 1) {
    $pos = strpos($string, $search);

    if ($pos === false) {
        return $string;
    }

    $searchLen = strlen($search);

    for ($i = 0; $i < $limit; $i++) {
        $string = substr_replace($string, $replace, $pos, $searchLen);

        $pos = strpos($string, $search);

        if ($pos === false) {
            break;
        }
    }

    return $string;
}

Example usage:

$search  = 'foo';
$replace = 'bar';
$string  = 'foo wizard makes foo brew for evil foo and jack';
$limit   = 2;

$replaced = str_replace_limit($search, $replace, $string, $limit);

echo $replaced;
// bar wizard makes bar brew for evil foo and jack

Maintain/Save/Restore scroll position when returning to a ListView

Isn't simply android:saveEnabled="true" in the ListView xml declaration enough?

Get Current Session Value in JavaScript?

The session is a server side thing, you cannot access it using jQuery. You can write an Http handler (that will share the sessionid if any) and return the value from there using $.ajax.

javascript - pass selected value from popup window to parent window input box

use: opener.document.<id of document>.innerHTML = xmlhttp.responseText;

jQuery: how to trigger anchor link's click event

It worked for me:

     window.location = $('#myanchor').attr('href');

Printing one character at a time from a string, using the while loop

Strings can have for loops to:

for a in string:
    print a

How to disable Excel's automatic cell reference change after copy/paste?

I came to this site looking for an easy way to copy without changing cell references. But now I thnk my own workaround is simpler than most of these methods. My method relies on the fact that Copy changes references but Move doesn't. Here's a simple example.

Assume you have raw data in columns A and B, and a formula in C (e.g. C=A+B) and you want the same formula in column F but Copying from C to F leads to F=D+E.

Copy contents of C to any empty temporary column, say R. The relative references will change to R=P+Q but ignore this even if it's flagged as an error.
Go back to C and Move (not Copy) it to F. Formula should be unchanged so F=A+B.
Now go to R and copy it back to C. Relative reference will revert to C=A+B
Delete the temporary formula in R.
Bob's your uncle.

I've done this with a range of cells so I imagine it would work with virtually any level of complexity. You just need an empty area to park the coiped cells. And of course you have to remember where you left them.

jquery background-color change on focus and blur

#FFFFEEE is not a correct color code. Try with #FFFFEE instead.

Eclipse jump to closing brace

With Ctrl + Shift + L you can open the "key assist", where you can find all the shortcuts.

What is the difference between Hibernate and Spring Data JPA

Hibernate is a JPA implementation, while Spring Data JPA is a JPA data access abstraction. Spring Data JPA cannot work without a JPA provider.

Spring Data offers a solution to the DDD Repository pattern or the legacy GenericDao custom implementations. It can also generate JPA queries on your behalf through method name conventions.

With Spring Data, you may use Hibernate, EclipseLink, or any other JPA provider. A very interesting benefit of using Spring or Java EE is that you can control transaction boundaries declaratively using the @Transactional annotation.

Spring JDBC is much more lightweight, and it's intended for native querying, and if you only intend to use JDBC alone, then you are better off using Spring JDBC to deal with the JDBC verbosity.

Therefore, Hibernate and Spring Data are complementary rather than competitors.

How can I set a proxy server for gem?

You can try export http_proxy=http://your_proxy:your_port

Facebook Oauth Logout

With PHP I'm doing:

<a href="?action=logout">logout.</a>

if(isset($_GET['action']) && $_GET['action'] === 'logout'){
    $facebook->destroySession();
    header(WHERE YOU WANT TO REDIRECT TO);
    exit();
}

Works and is nice and easy am just trying to find a logout button graphic now!

Assign multiple values to array in C

typedef struct{
  char array[4];
}my_array;

my_array array = { .array = {1,1,1,1} }; // initialisation

void assign(my_array a)
{
  array.array[0] = a.array[0];
  array.array[1] = a.array[1];
  array.array[2] = a.array[2];
  array.array[3] = a.array[3]; 
}

char num = 5;
char ber = 6;

int main(void)
{
  printf("%d\n", array.array[0]);
// ...

  // this works even after initialisation
  assign((my_array){ .array = {num,ber,num,ber} });

  printf("%d\n", array.array[0]);
// ....
  return 0;
}

How to view unallocated free space on a hard disk through terminal

The filesystem size can be different from the patition size. To repair you need to do this

df -h

see what is the name of the partition say /dev/sda3

resize2fs /dev/sda3

Python: list of lists

I came here because I'm new with python and lazy so I was searching an example to create a list of 2 lists, after a while a realized the topic here could be wrong... this is a code to create a list of lists:

listoflists = []
for i in range(0,2):
    sublist = []
    for j in range(0,10)
        sublist.append((i,j))
    listoflists.append(sublist)
print listoflists

this the output [ [(0, 0), (0, 1), (0, 2), (0, 3), (0, 4), (0, 5), (0, 6), (0, 7), (0, 8), (0, 9)], [(1, 0), (1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6), (1, 7), (1, 8), (1, 9)] ]

The problem with your code seems to be you are creating a tuple with your list and you get the reference to the list instead of a copy. That I guess should fall under a tuple topic...

Is a Python dictionary an example of a hash table?

To expand upon nosklo's explanation:

a = {}
b = ['some', 'list']
a[b] = 'some' # this won't work
a[tuple(b)] = 'some' # this will, same as a['some', 'list']

Floating point exception( core dump

You are getting Floating point exception because Number % i, when i is 0:

int Is_Prime( int Number ){

  int i ;

  for( i = 0 ; i < Number / 2 ; i++ ){

    if( Number % i != 0 ) return -1 ;

  }

  return Number ;

}

Just start the loop at i = 2. Since i = 1 in Number % i it always be equal to zero, since Number is a int.

ASP.NET MVC 3 Razor - Adding class to EditorFor

As of ASP.NET MVC 5.1, adding a class to an EditorFor is possible (the original question specified ASP.NET MVC 3, and the accepted answer is still the best with that considered).

@Html.EditorFor(x=> x.MyProperty,
    new { htmlAttributes = new { @class = "MyCssClass" } })

See: What's New in ASP.NET MVC 5.1, Bootstrap support for editor templates

Recover sa password

The best way is to simply reset the password by connecting with a domain/local admin (so you may need help from your system administrators), but this only works if SQL Server was set up to allow local admins (these are now left off the default admin group during setup).

If you can't use this or other existing methods to recover / reset the SA password, some of which are explained here:

Then you could always backup your important databases, uninstall SQL Server, and install a fresh instance.

You can also search for less scrupulous ways to do it (e.g. there are password crackers that I am not enthusiastic about sharing).

As an aside, the login properties for sa would never say Windows Authentication. This is by design as this is a SQL Authentication account. This does not mean that Windows Authentication is disabled at the instance level (in fact it is not possible to do so), it just doesn't apply for a SQL auth account.

I wrote a tip on using PSExec to connect to an instance using the NT AUTHORITY\SYSTEM account (which works < SQL Server 2012), and a follow-up that shows how to hack the SqlWriter service (which can work on more modern versions):

And some other resources:

Python os.path.join() on a list

The problem is, os.path.join doesn't take a list as argument, it has to be separate arguments.

This is where *, the 'splat' operator comes into play...

I can do

>>> s = "c:/,home,foo,bar,some.txt".split(",")
>>> os.path.join(*s)
'c:/home\\foo\\bar\\some.txt'

Get all rows from SQLite

I have been looking into the same problem! I think your problem is related to where you identify the variable that you use to populate the ArrayList that you return. If you define it inside the loop, then it will always reference the last row in the table in the database. In order to avoid this, you have to identify it outside the loop:

String name;
if (cursor.moveToFirst()) {

        while (cursor.isAfterLast() == false) {
            name = cursor.getString(cursor
                    .getColumnIndex(countyname));

            list.add(name);
            cursor.moveToNext();
        }
}

How to use SQL Order By statement to sort results case insensitive?

SELECT * FROM NOTES ORDER BY UPPER(title)

Set scroll position

You can use window.scrollTo(), like this:

window.scrollTo(0, 0); // values are x,y-offset

Android Call an method from another class

You should use the following code :

Class2 cls2 = new Class2();
cls2.UpdateEmployee();

In case you don't want to create a new instance to call the method, you can decalre the method as static and then you can just call Class2.UpdateEmployee().

Understanding the set() function

As +Volatility and yourself pointed out, sets are unordered. If you need the elements to be in order, just call sorted on the set:

>>> y = [1, 1, 6, 6, 6, 6, 6, 8, 8]
>>> sorted(set(y))
[1, 6, 8]

jquery - is not a function error

This problem is "best" solved by using an anonymous function to pass-in the jQuery object thusly:

The Anonymous Function Looks Like:

<script type="text/javascript">
    (function($) {
        // You pass-in jQuery and then alias it with the $-sign
        // So your internal code doesn't change
    })(jQuery);
</script>

This is JavaScript's method of implementing (poor man's) 'Dependency Injection' when used alongside things like the 'Module Pattern'.

So Your Code Would Look Like:
Of course, you might want to make some changes to your internal code now, but you get the idea.

<script type="text/javascript">
    (function($) {
        $.fn.pluginbutton = function(options) {
            myoptions = $.extend({ left: true });
            return this.each(function() {
                var focus = false;
                if (focus === false) {
                    this.hover(function() {
                        this.animate({ backgroundPosition: "0 -30px" }, { duration: 0 });
                        this.removeClass('VBfocus').addClass('VBHover');
                    }, function() {
                        this.animate({ backgroundPosition: "0 0" }, { duration: 0 });
                        this.removeClass('VBfocus').removeClass('VBHover');
                    });
                }
                this.mousedown(function() {
                    focus = true
                    this.animate({ backgroundPosition: "0 30px" }, { duration: 0 });
                    this.addClass('VBfocus').removeClass('VBHover');
                }, function() {
                    focus = false;
                    this.animate({ backgroundPosition: "0 0" }, { duration: 0 });
                    this.removeClass('VBfocus').addClass('VBHover');
                });
            });
        }
    })(jQuery);
</script>

Redirecting new tab on button click.(Response.Redirect) in asp.net C#

Wouldn't you be better off with

<asp:HyperLink ID="HyperLink1" runat="server" 
            NavigateUrl="CMS_1.aspx" 
            Target="_blank">
    Click here
</asp:HyperLink>

Because, to replicate your desired behavior on an asp:Button, you have to call window.open on the OnClientClick event of the button which looks a lot less cleaner than the above solution. Plus asp:HyperLink is there to handle scenarios like this.

If you want to replicate this using an asp:Button, do this.

<asp:Button ID="btn" runat="Server" 
        Text="SUBMIT"
        OnClientClick="javascript:return openRequestedPopup();"/>

JavaScript function.

var windowObjectReference;

function openRequestedPopup() {
    windowObjectReference = window.open("CMS_1.aspx",
              "DescriptiveWindowName",
              "menubar=yes,location=yes,resizable=yes,scrollbars=yes,status=yes");
}

jQuery get value of selected radio button

HTML Markup :

<div class="form-group">
  <input id="rdMale" type="radio" class="clsGender" value="Male" name="rdGender" /> Male
  <input id="rdFemale" type="radio" class="clsGender" value="Female" name="rdGender" /> Female
 </div>

Get selected value by radio button Id:

 $("input[name='rdGender']").click(function () {
     alert($("#rdMale").val());
});

Get value by radiobutton Classname

 $(".clsGender").click(function () {
       alert($(this).val());
            //or
      alert($(".clsGender:checked").val());
   });

Get value by name

   $("input[name='rdGender']").click(function () {
          var rdVaule = $("input[name='rdGender']:checked").val();
          alert(rdVaule);
   });

jQuery UI dialog positioning

instead of doing pure jquery, i would do:

$(".mytext").mouseover(function() {
    x= $(this).position().left - document.scrollLeft
    y= $(this).position().top - document.scrollTop
    $("#dialog").dialog('option', 'position', [y, x]);
}

if i am understanding your question correctly, the code you have is positioning the dialog as if the page had no scroll, but you want it to take the scroll into account. my code should do that.

How to embed an autoplaying YouTube video in an iframe?

The flags, or parameters that you can use with IFRAME and OBJECT embeds are documented here; the details about which parameter works with what player are also clearly mentioned:

YouTube Embedded Players and Player Parameters

You will notice that autoplay is supported by all players (AS3, AS2 and HTML5).

GitLab git user password

I had this same problem when using a key of 4096 bits:

$ ssh-keygen -t rsa -C "GitLab" -b 4096
$ ssh -vT git@gitlabhost
...
debug1: Offering public key: /home/user/.ssh/id_rsa
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /home/user/.ssh/id_dsa
debug1: Trying private key: /home/user/.ssh/id_ecdsa
debug1: Next authentication method: password
git@gitlabhost's password:
Connection closed by host

But with the 2048 bit key (the default size), ssh connects to gitlab without prompting for a password (after adding the new pub key to the user's gitlab ssh keys)

$ ssh-keygen -t rsa -C "GitLab"
$ ssh -vT git@gitlabhost
Welcome to GitLab, Joe User!

How do I create a foreign key in SQL Server?

You can also name your foreign key constraint by using:

CONSTRAINT your_name_here FOREIGN KEY (question_exam_id) REFERENCES EXAMS (exam_id)

SQL: Combine Select count(*) from multiple tables

For oracle:

select( 
select count(*) from foo1 where ID = '00123244552000258'
+
select count(*) from foo2 where ID = '00123244552000258'
+
select count(*) from foo3 where ID = '00123244552000258'
) total from dual;

Cannot find mysql.sock

I'm getting the same error on Mac OS X 10.11.6:

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

After a lot of agonizing and digging through advice here and in related questions, none of which seemed to fix the problem, I went back and deleted the installed folders, and just did brew install mysql.

Still getting the same error with most commands, but this works:

/usr/local/bin/mysqld

and returns:

/usr/local/bin/mysqld: ready for connections.

Version: '5.7.12' socket: '/tmp/mysql.sock' port: 3306 Homebrew

Regular Expressions: Search in list

Full Example (Python 3):
For Python 2.x look into Note below

import re

mylist = ["dog", "cat", "wildcat", "thundercat", "cow", "hooo"]
r = re.compile(".*cat")
newlist = list(filter(r.match, mylist)) # Read Note
print(newlist)

Prints:

['cat', 'wildcat', 'thundercat']

Note:

For Python 2.x developers, filter returns a list already. In Python 3.x filter was changed to return an iterator so it has to be converted to list (in order to see it printed out nicely).

Python 3 code example
Python 2.x code example

How do I resolve "Please make sure that the file is accessible and that it is a valid assembly or COM component"?

In my case I also have unmanaged dll's (C++) in workspace and if you specify:

<files>
    <file src="bin\*.dll" target="lib" />
</files>

nuget would try to load every dll as an assembly, even the C++ libraries! To avoid this behaviour explicitly define your C# assemblies with references tag:

<references>
    <reference file="Managed1.dll" />
    <reference file="Managed2.dll" />
</references>

Remark: parent of references is metadata -> according to documentation https://docs.microsoft.com/en-us/nuget/reference/nuspec#general-form-and-schema

Documentation: https://docs.microsoft.com/en-us/nuget/reference/nuspec

How to clear PermGen space Error in tomcat

This one worked for me, in startup.bat the following line needs to be added if it doesn't exist set JAVA_OPTS with the value -Xms128m -Xmx1024m -XX:PermSize=64m -XX:MaxPermSize=256. The full line:

set JAVA_OPTS=-Dfile.encoding=UTF-8 -Xms128m -Xmx1024m -XX:PermSize=64m -XX:MaxPermSize=256

How to change text transparency in HTML/CSS?

There is no CSS property like background-opacity that you can use only for changing the opacity or transparency of an element's background without affecting the child elements, on the other hand if you will try to use the CSS opacity property it will not only changes the opacity of background but changes the opacity of all the child elements as well. In such situation you can use RGBA color introduced in CSS3 that includes alpha transparency as part of the color value. Using RGBA color you can set the color of the background as well as its transparency.

How do I get the result of a command in a variable in windows?

You should use the for command, here is an example:

@echo off
rem Commands go here
exit /b
:output
for /f "tokens=* useback" %%a in (`%~1`) do set "output=%%a"

and you can use call :output "Command goes here" then the output will be in the %output% variable.

Note: If you have a command output that is multiline, this tool will set the output to the last line of your multiline command.

Access all Environment properties as a Map or Properties object

Spring won't allow to decouple via java.util.Properties from Spring Environment.

But Properties.load() still works in a Spring boot application:

Properties p = new Properties();
try (InputStream is = getClass().getResourceAsStream("/my.properties")) {
    p.load(is);
}

How to go back last page

To go back without refreshing the page, We can do in html like below javascript:history.back()

<a class="btn btn-danger" href="javascript:history.back()">Go Back</a>

Custom method names in ASP.NET Web API

By default the route configuration follows RESTFul conventions meaning that it will accept only the Get, Post, Put and Delete action names (look at the route in global.asax => by default it doesn't allow you to specify any action name => it uses the HTTP verb to dispatch). So when you send a GET request to /api/users/authenticate you are basically calling the Get(int id) action and passing id=authenticate which obviously crashes because your Get action expects an integer.

If you want to have different action names than the standard ones you could modify your route definition in global.asax:

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

Now you can navigate to /api/users/getauthenticate to authenticate the user.

How can I get my Twitter Bootstrap buttons to right align?

Update 2019 - Bootstrap 4.0.0

The pull-right class is now float-right in Bootstrap 4...

    <div class="row">
        <div class="col-12">One <input type="button" class="btn float-right" value="test"></div>
        <div class="col-12">Two <input type="button" class="btn float-right" value="test"></div>
    </div>

http://www.codeply.com/go/nTobetXAwb

It's also better to not align the ul list and use block elements for the rows.

Is float-right still not working?

Remember that Bootstrap 4 is now flexbox, and many elements are display:flex which can prevent float-right from working. In some cases, the util classes like align-self-end or ml-auto work to right align elements that are inside a flexbox container like a Bootstrap 4 .row, Card or Nav.

Also remember that text-right still works on inline elements.

Bootstrap 4 align right examples

Bootstrap 3

Use the pull-right class.

Controlling a USB power supply (on/off) with Linux

USB 5v power is always on (even when the computer is turned off, on some computers and on some ports.) You will probably need to program an Arduino with some sort of switch, and control it via Serial library from USB plugged in to the computer.

In other words, a combination of this switch tutorial and this tutorial on communicating via Serial libary to Arduino plugged in via USB.

Extract substring using regexp in plain bash

    echo "US/Central - 10:26 PM (CST)" | sed -n "s/^.*-\s*\(\S*\).*$/\1/p"

-n      suppress printing
s       substitute
^.*     anything at the beginning
-       up until the dash
\s*     any space characters (any whitespace character)
\(      start capture group
\S*     any non-space characters
\)      end capture group
.*$     anything at the end
\1      substitute 1st capture group for everything on line
p       print it

When tracing out variables in the console, How to create a new line?

console.log('Hello, \n' + 
            'Text under your Header\n' + 
            '-------------------------\n' + 
            'More Text\n' +
            'Moree Text\n' +
            'Moooooer Text\n' );

This works great for me for text only, and easy on the eye.

PHP - add 1 day to date format mm-dd-yyyy

Actually I wanted same alike thing, To get one year backward date, for a given date! :-)

With the hint of above answer from @mohammad mohsenipur I got to the following link, via his given link!

Luckily, there is a method same as date_add method, named date_sub method! :-) I do the following to get done what I wanted!

$date = date_create('2000-01-01');
date_sub($date, date_interval_create_from_date_string('1 years'));
echo date_format($date, 'Y-m-d');

Hopes this answer will help somebody too! :-)

Good luck guys!

How to parseInt in Angular.js

Inside template this working finely.

<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>
<body>

<div ng-app="">
<input ng-model="name" value="0">
<p>My first expression: {{ (name-0) + 5 }}</p>
</div>

</body>
</html>

Primitive type 'short' - casting in Java

I'd like to add something that hasn't been pointed out. Java doesn't take into account the values you have given the variables (2 and 3) in...

short a = 2; short b = 3; short c = a + b;

So as far as Java knows, you could done this...

short a = 32767; short b = 32767; short c = a + b;

Which would be outside the range of short, it autoboxes the result to an int becuase it's "possible" that the result will be more than a short but not more than an int. Int was chosen as a "default" because basically most people wont be hard coding values above 2,147,483,647 or below -2,147,483,648

Width of input type=text element

I think you are forgetting about the border. Having a one-pixel-wide border on the Div will take away two pixels of total length. Therefore it will appear as though the div is two pixels shorter than it actually is.

Sort Array of object by object field in Angular 6

Not tested but should work

 products.sort((a,b)=>a.title.rendered > b.title.rendered)

Bash script - variable content as a command to run

You just need to do:

#!/bin/bash
count=$(cat last_queries.txt | wc -l)
$(perl test.pl test2 $count)

However, if you want to call your Perl command later, and that's why you want to assign it to a variable, then:

#!/bin/bash
count=$(cat last_queries.txt | wc -l)
var="perl test.pl test2 $count" # You need double quotes to get your $count value substituted.

...stuff...

eval $var

As per Bash's help:

~$ help eval
eval: eval [arg ...]
    Execute arguments as a shell command.

    Combine ARGs into a single string, use the result as input to the shell,
    and execute the resulting commands.

    Exit Status:
    Returns exit status of command or success if command is null.

Python - Extracting and Saving Video Frames

From here download this video so we have the same video file for the test. Make sure to have that mp4 file in the same directory of your python code. Then also make sure to run the python interpreter from the same directory.

Then modify the code, ditch waitKey that's wasting time also without a window it cannot capture the keyboard events. Also we print the success value to make sure it's reading the frames successfully.

import cv2
vidcap = cv2.VideoCapture('big_buck_bunny_720p_5mb.mp4')
success,image = vidcap.read()
count = 0
while success:
  cv2.imwrite("frame%d.jpg" % count, image)     # save frame as JPEG file      
  success,image = vidcap.read()
  print('Read a new frame: ', success)
  count += 1

How does that go?

Adding header to all request with Retrofit 2

Kotlin version would be

fun getHeaderInterceptor():Interceptor{
    return object : Interceptor {
        @Throws(IOException::class)
        override fun intercept(chain: Interceptor.Chain): Response {
            val request =
            chain.request().newBuilder()
                    .header(Headers.KEY_AUTHORIZATION, "Bearer.....")
                    .build()
            return chain.proceed(request)
        }
    }
}


private fun createOkHttpClient(): OkHttpClient {
    return OkHttpClient.Builder()
            .apply {
                if(BuildConfig.DEBUG){
                    this.addInterceptor(HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BASIC))
                }
            }
            .addInterceptor(getHeaderInterceptor())
            .build()
}

How to send an email from JavaScript

Since these all are wonderful infos there's a little api called Mandrill to send mails from javascript and it works perfectly. You can give it a shot. Here's a little tutorial for the start.

Invalid column name sql error

Change this line:

cmd.CommandText = "INSERT INTO Data (Name,PhoneNo,Address) VALUES (" + txtName.Text + "," + txtPhone.Text + "," + txtAddress.Text + ");";

to this:

cmd.CommandText = "INSERT INTO Data (Name,PhoneNo,Address) VALUES ('" + txtName.Text + "','" + txtPhone.Text + "','" + txtAddress.Text + "');";

Your insert command is expecting text, and you need single quotes (') between the actual value so SQL can understand it as text.

EDIT: For those of you who aren't happy with this answer, I would like to point out that there is an issue with this code in regards to SQL Injection. When I answered this question I only considered the question in point which was the missing single-quote on his code and I pointed out how to fix it. A much better answer has been posted by Adam (and I voted for it), where he explains the issues with injection and shows a way to prevent. Now relax and be happy guys.

How to set focus on an input field after rendering?

React 16.3 added a new convenient way to handle this by creating a ref in component's constructor and use it like below:

class MyForm extends Component {
  constructor(props) {
      super(props);

      this.textInput = React.createRef();
  }

  componentDidMount() {
    this.textInput.current.focus();
  }

  render() {
    return(
      <div>
        <input ref={this.textInput} />
      </div>
    );
  }
}

For more details about React.createRef, you can check this article in React blog.

Update:

Starting from React 16.8, useRef hook can be used in function components to achieve the same result:

import React, { useEffect, useRef } from 'react';

const MyForm = () => {
  const textInput = useRef(null);

  useEffect(() => {
    textInput.current.focus();
  }, []);

  return (
    <div>
      <input ref={textInput} />
    </div>
  );
};

How to detect if javascript files are loaded?

Take a look at jQuery's .load() http://api.jquery.com/load-event/

$('script').load(function () { });

Instagram API - How can I retrieve the list of people a user is following on Instagram

I made my own way based on Caitlin Morris's answer for fetching all folowers and followings on Instagram. Just copy this code, paste in browser console and wait for a few seconds.

You need to use browser console from instagram.com tab to make it works.

let username = 'USERNAME'
let followers = [], followings = []
try {
  let res = await fetch(`https://www.instagram.com/${username}/?__a=1`)

  res = await res.json()
  let userId = res.graphql.user.id

  let after = null, has_next = true
  while (has_next) {
    await fetch(`https://www.instagram.com/graphql/query/?query_hash=c76146de99bb02f6415203be841dd25a&variables=` + encodeURIComponent(JSON.stringify({
      id: userId,
      include_reel: true,
      fetch_mutual: true,
      first: 50,
      after: after
    }))).then(res => res.json()).then(res => {
      has_next = res.data.user.edge_followed_by.page_info.has_next_page
      after = res.data.user.edge_followed_by.page_info.end_cursor
      followers = followers.concat(res.data.user.edge_followed_by.edges.map(({node}) => {
        return {
          username: node.username,
          full_name: node.full_name
        }
      }))
    })
  }
  console.log('Followers', followers)

  has_next = true
  after = null
  while (has_next) {
    await fetch(`https://www.instagram.com/graphql/query/?query_hash=d04b0a864b4b54837c0d870b0e77e076&variables=` + encodeURIComponent(JSON.stringify({
      id: userId,
      include_reel: true,
      fetch_mutual: true,
      first: 50,
      after: after
    }))).then(res => res.json()).then(res => {
      has_next = res.data.user.edge_follow.page_info.has_next_page
      after = res.data.user.edge_follow.page_info.end_cursor
      followings = followings.concat(res.data.user.edge_follow.edges.map(({node}) => {
        return {
          username: node.username,
          full_name: node.full_name
        }
      }))
    })
  }
  console.log('Followings', followings)
} catch (err) {
  console.log('Invalid username')
}

Double precision - decimal places

Decimal representation of floating point numbers is kind of strange. If you have a number with 15 decimal places and convert that to a double, then print it out with exactly 15 decimal places, you should get the same number. On the other hand, if you print out an arbitrary double with 15 decimal places and the convert it back to a double, you won't necessarily get the same value back—you need 17 decimal places for that. And neither 15 nor 17 decimal places are enough to accurately display the exact decimal equivalent of an arbitrary double. In general, you need over 100 decimal places to do that precisely.

See the Wikipedia page for double-precision and this article on floating-point precision.

Warning message: In `...` : invalid factor level, NA generated

The easiest way to fix this is to add a new factor to your column. Use the levels function to determine how many factors you have and then add a new factor.

    > levels(data$Fireplace.Qu)
    [1] "Ex" "Fa" "Gd" "Po" "TA"
    > levels(data$Fireplace.Qu) = c("Ex", "Fa", "Gd", "Po", "TA", "None")
    [1] "Ex"   "Fa"   "Gd"   "Po"   " TA"  "None"

"Unresolved inclusion" error with Eclipse CDT for C standard library headers

How to copy data to clipboard in C#

My Experience with this issue using WPF C# coping to clipboard and System.Threading.ThreadStateException is here with my code that worked correctly with all browsers:

Thread thread = new Thread(() => Clipboard.SetText("String to be copied to clipboard"));
thread.SetApartmentState(ApartmentState.STA); //Set the thread to STA
thread.Start(); 
thread.Join();

credits to this post here

But this works only on localhost, so don't try this on a server, as it's not going to work.

On server-side, I did it by using zeroclipboard. The only way, after a lot of research.

C char array initialization

The relevant part of C11 standard draft n1570 6.7.9 initialization says:

14 An array of character type may be initialized by a character string literal or UTF-8 string literal, optionally enclosed in braces. Successive bytes of the string literal (including the terminating null character if there is room or if the array is of unknown size) initialize the elements of the array.

and

21 If there are fewer initializers in a brace-enclosed list than there are elements or members of an aggregate, or fewer characters in a string literal used to initialize an array of known size than there are elements in the array, the remainder of the aggregate shall be initialized implicitly the same as objects that have static storage duration.

Thus, the '\0' is appended, if there is enough space, and the remaining characters are initialized with the value that a static char c; would be initialized within a function.

Finally,

10 If an object that has automatic storage duration is not initialized explicitly, its value is indeterminate. If an object that has static or thread storage duration is not initialized explicitly, then:

[--]

if it has arithmetic type, it is initialized to (positive or unsigned) zero;

[--]

Thus, char being an arithmetic type the remainder of the array is also guaranteed to be initialized with zeroes.

PHP check if date between two dates

Edit: use <= or >= to count today's date.

This is the right answer for your code. Just use the strtotime() php function.

$paymentDate = date('Y-m-d');
$paymentDate=date('Y-m-d', strtotime($paymentDate));
//echo $paymentDate; // echos today! 
$contractDateBegin = date('Y-m-d', strtotime("01/01/2001"));
$contractDateEnd = date('Y-m-d', strtotime("01/01/2012"));
    
if (($paymentDate >= $contractDateBegin) && ($paymentDate <= $contractDateEnd)){
    echo "is between";
}else{
    echo "NO GO!";  
}

How to do fade-in and fade-out with JavaScript and CSS

Heres my code for a fade in/out toggle functions.

fadeIn: function (len) {
                var obj = this.e;
                obj.style.display = '';
                var op = 0; 
                var timer = setInterval(function () {
                    if (op >= 1 || op >= 1.0){
                        console.log('done', op)
                        clearInterval(timer);
                    }
                    obj.style.opacity = op.toFixed(1);
                    op += 0.1;
                    console.log(obj.style.opacity);
                }, len);
                return this;
            },
    fadeOut: function (len) {
                var obj = this.e;
                var op = 1; 
                var timer = setInterval(function () {
                    if (op <= 0){
                        clearInterval(timer);
                        console.log('done', op)
                        obj.style.display = 'none';
                    }
                    obj.style.opacity = op.toFixed(1);
                    op -= 0.1;
                    console.log(obj.style.opacity)
                }, len);
                return this;
            },

This was from a jQuery style lib i did. hope it's helpfull. link to lib on cloud9: https://c9.io/christopherdumas/magik_wb

Java error: Only a type can be imported. XYZ resolves to a package

To me it was a wrong deployment. Deployed properly, everything works (check my question for details).

How to add 'libs' folder in Android Studio?

The solution for me was very simple (after 10 hours of searching). Above where your folders are there is a combobox that says "android" click it and choose "Project".

How do I declare class-level properties in Objective-C?

Starting from Xcode 8, you can use the class property attribute as answered by Berbie.

However, in the implementation, you need to define both class getter and setter for the class property using a static variable in lieu of an iVar.

Sample.h

@interface Sample: NSObject
@property (class, retain) Sample *sharedSample;
@end

Sample.m

@implementation Sample
static Sample *_sharedSample;
+ ( Sample *)sharedSample {
   if (_sharedSample==nil) {
      [Sample setSharedSample:_sharedSample];
   }
   return _sharedSample;
}

+ (void)setSharedSample:(Sample *)sample {
   _sharedSample = [[Sample alloc]init];
}
@end

check if jquery has been loaded, then load it if false

I am using CDN for my project and as part of fallback handling, i was using below code,

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
    <script type="text/javascript">
                if ((typeof jQuery == 'undefined')) {
                    document.write(unescape("%3Cscript src='/Responsive/Scripts/jquery-1.9.1.min.js' type='text/javascript'%3E%3C/script%3E"));   
                }
</script>

Just to verify, i removed CDN reference and execute the code. Its broken and it's never entered into if loop as typeof jQuery is coming as function instead of undefined .

This is because of cached older version of jquery 1.6.1 which return function and break my code because i am using jquery 1.9.1. As i need exact version of jquery, i modified code as below,

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript">
            if ((typeof jQuery == 'undefined') || (jQuery.fn.jquery != "1.9.1")) {
                document.write(unescape("%3Cscript src='/Responsive/Scripts/jquery-1.9.1.min.js' type='text/javascript'%3E%3C/script%3E"));   
            }
</script>

How do you embed binary data in XML?

You could encode the binary data using base64 and put it into a Base64 element; the below article is a pretty good one on the subject.

Handling Binary Data in XML Documents

Printing the last column of a line in a file

You don't see anything, because of buffering. The output is shown, when there are enough lines or end of file is reached. tail -f means wait for more input, but there are no more lines in file and so the pipe to grep is never closed.

If you omit -f from tail the output is shown immediately:

tail file | grep A1 | awk '{print $NF}'

@EdMorton is right of course. Awk can search for A1 as well, which shortens the command line to

tail file | awk '/A1/ {print $NF}'

or without tail, showing the last column of all lines containing A1

awk '/A1/ {print $NF}' file

Thanks to @MitchellTracy's comment, tail might miss the record containing A1 and thus you get no output at all. This may be solved by switching tail and awk, searching first through the file and only then show the last line:

awk '/A1/ {print $NF}' file | tail -n1

How to use delimiter for csv in python

CSV Files with Custom Delimiters

By default, a comma is used as a delimiter in a CSV file. However, some CSV files can use delimiters other than a comma. Few popular ones are | and \t.

import csv
data_list = [["SN", "Name", "Contribution"],
             [1, "Linus Torvalds", "Linux Kernel"],
             [2, "Tim Berners-Lee", "World Wide Web"],
             [3, "Guido van Rossum", "Python Programming"]]
with open('innovators.csv', 'w', newline='') as file:
    writer = csv.writer(file, delimiter='|')
    writer.writerows(data_list)

output:

SN|Name|Contribution
1|Linus Torvalds|Linux Kernel
2|Tim Berners-Lee|World Wide Web
3|Guido van Rossum|Python Programming

Write CSV files with quotes

import csv

row_list = [["SN", "Name", "Contribution"],
             [1, "Linus Torvalds", "Linux Kernel"],
             [2, "Tim Berners-Lee", "World Wide Web"],
             [3, "Guido van Rossum", "Python Programming"]]
with open('innovators.csv', 'w', newline='') as file:
    writer = csv.writer(file, quoting=csv.QUOTE_NONNUMERIC, delimiter=';')
    writer.writerows(row_list)

output:

"SN";"Name";"Contribution"
1;"Linus Torvalds";"Linux Kernel"
2;"Tim Berners-Lee";"World Wide Web"
3;"Guido van Rossum";"Python Programming"

As you can see, we have passed csv.QUOTE_NONNUMERIC to the quoting parameter. It is a constant defined by the csv module.

csv.QUOTE_NONNUMERIC specifies the writer object that quotes should be added around the non-numeric entries.

There are 3 other predefined constants you can pass to the quoting parameter:

csv.QUOTE_ALL - Specifies the writer object to write CSV file with quotes around all the entries.
csv.QUOTE_MINIMAL - Specifies the writer object to only quote those fields which contain special characters (delimiter, quotechar or any characters in lineterminator)
csv.QUOTE_NONE - Specifies the writer object that none of the entries should be quoted. It is the default value.

import csv

row_list = [["SN", "Name", "Contribution"],
             [1, "Linus Torvalds", "Linux Kernel"],
             [2, "Tim Berners-Lee", "World Wide Web"],
             [3, "Guido van Rossum", "Python Programming"]]
with open('innovators.csv', 'w', newline='') as file:
    writer = csv.writer(file, quoting=csv.QUOTE_NONNUMERIC,
                        delimiter=';', quotechar='*')
    writer.writerows(row_list)

output:

*SN*;*Name*;*Contribution*
1;*Linus Torvalds*;*Linux Kernel*
2;*Tim Berners-Lee*;*World Wide Web*
3;*Guido van Rossum*;*Python Programming*

Here, we can see that quotechar='*' parameter instructs the writer object to use * as quote for all non-numeric values.

How to make a circle around content using CSS?

Detect Scroll Up & Scroll down in ListView

Simple way to detect scroll up/down on android listview

@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount){
  if(prevVisibleItem != firstVisibleItem){
    if(prevVisibleItem < firstVisibleItem)
      //ScrollDown
    else
      //ScrollUp

  prevVisibleItem = firstVisibleItem;
}

dont forget

yourListView.setOnScrollListener(yourScrollListener);

php multidimensional array get values

This is the way to iterate on this array:

foreach($hotels as $row) {
       foreach($row['rooms'] as $k) {
             echo $k['boards']['board_id'];
             echo $k['boards']['price'];
       }
}

You want to iterate on the hotels and the rooms (the ones with numeric indexes), because those seem to be the "collections" in this case. The other arrays only hold and group properties.

android.os.NetworkOnMainThreadException with android 4.2

android.os.NetworkOnMainThreadException occurs when you try to access network on your main thread (You main activity execution). To avoid this, you must create a separate thread or AsyncTask or Runnable implementation to execute your JSON data loading. Since HoneyComb you can not further execute the network task on main thread. Here is the implementation using AsyncTask for a network task execution

Error: could not find function ... in R

If you are using parallelMap you'll need to export custom functions to the slave jobs, otherwise you get an error "could not find function ".

If you set a non-missing level on parallelStart the same argument should be passed to parallelExport, else you get the same error. So this should be strictly followed:

parallelStart(mode = "<your mode here>", N, level = "<task.level>")
parallelExport("<myfun>", level = "<task.level>")

Graphviz: How to go from .dot to a graph?

You can use a very good online tool for it. Here is the link dreampuf.github.io Just replace the code inside editer with your code.

Command line: search and replace in all filenames matched by grep

I like and used the above solution or a system wide search and replace among thousands of files:

find -name '*.htm?' -print -exec sed -i.bak 's/foo/bar/g' {} \;

I assume with the '*.htm?' instead of .html it searches and finds .htm and .html files alike.

I replace the .bak with the more system wide used tilde (~) to make clean up of backup files easier.

How do I bind to list of checkbox values with AngularJS?

I think the easiest workaround would be to use 'select' with 'multiple' specified:

<select ng-model="selectedfruit" multiple ng-options="v for v in fruit"></select>

Otherwise, I think you'll have to process the list to construct the list (by $watch()ing the model array bind with checkboxes).

SSL peer shut down incorrectly in Java

I was facing same issue, for me adding certificate to trust store solved this issue.

How to capitalize the first letter of word in a string using Java?

My functional approach. its capstilise first character in sentence after whitescape in whole paragraph.

For capatilising only first character of the word just remove .split(" ")

           b.name.split(" ")
                 .filter { !it.isEmpty() }
                 .map { it.substring(0, 1).toUpperCase() 
                 +it.substring(1).toLowerCase() }
                  .joinToString(" ")

VBA Public Array : how to?

You are using the wrong type. The Array(...) function returns a Variant, not a String.

Thus, in the Declaration section of your module (it does not need to be a different module!), you define

Public colHeader As Variant

and somewhere at the beginning of your program code (for example, in the Workbook_Open event) you initialize it with

colHeader = Array("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L")

Another (simple) alternative would be to create a function that returns the array, e.g. something like

Public Function GetHeaders() As Variant
    GetHeaders = Array("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L")
End Function

This has the advantage that you do not need to initialize the global variable and the drawback that the array is created again on every function call.

Android: show/hide status bar/power bar

 @Override
 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //hide status bar
    requestWindowFeature( Window.FEATURE_NO_TITLE );
    getWindow().setFlags( WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN );


    setContentView(R.layout.activity_main);
}

Epoch vs Iteration when training neural networks

According to Google's Machine Learning Glossary, an epoch is defined as

"A full training pass over the entire dataset such that each example has been seen once. Thus, an epoch represents N/batch_size training iterations, where N is the total number of examples."

If you are training model for 10 epochs with batch size 6, given total 12 samples that means:

the model will be able to see whole dataset in 2 iterations ( 12 / 6 = 2) i.e. single epoch.
overall, the model will have 2 X 10 = 20 iterations (iterations-per-epoch X no-of-epochs)
re-evaluation of loss and model parameters will be performed after each iteration!

The import org.apache.commons cannot be resolved in eclipse juno

Look for "poi-3.17.jar"!!!

Download from "https://poi.apache.org/download.html".
Click the one Binary Distribution -> poi-bin-3.17-20170915.tar.gz
Unzip the file download and look for this "poi-3.17.jar".

Problem solved and errors disappeared.

How to use opencv in using Gradle?

You can do this very easily in Android Studio.

Follow the below steps to add Open CV in your project as library.

Create a libraries folder underneath your project main directory. For example, if your project is OpenCVExamples, you would create a OpenCVExamples/libraries folder.
Go to the location where you have SDK "\OpenCV-2.4.8-android-sdk\sdk" here you will find the java folder, rename it to opencv.
Now copy the complete opencv directory from the SDK into the libraries folder you just created.

Now create a build.gradle file in the opencv directory with the following contents

apply plugin: 'android-library'

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.9.+'
    }
}

android {
    compileSdkVersion 19
    buildToolsVersion "19.0.1"

    defaultConfig {
        minSdkVersion 8
        targetSdkVersion 19
        versionCode 2480
        versionName "2.4.8"
    }

    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = ['src']
            resources.srcDirs = ['src']
            res.srcDirs = ['res']
            aidl.srcDirs = ['src']
        }
    }
}

Edit your settings.gradle file in your application’s main directory and add this line:
```
include ':libraries:opencv'
```
Sync your project with Gradle and it should looks like this
Right click on your project then click on the Open Module Settings then Choose Modules from the left-hand list, click on your application’s module, click on the Dependencies tab, and click on the + button to add a new module dependency.
Choose Module dependency. It will open a dialog with a list of modules to choose from; select “:libraries:opencv”.
Create a jniLibs folder in the /app/src/main/ location and copy the all the folder with *.so files (armeabi, armeabi-v7a, mips, x86) in the jniLibs from the OpenCV SDK.
Click OK. Now everything done, go and enjoy with OpenCV.

UML diagram shapes missing on Visio 2013

CTRL+N-- to open a new document.

Right Edge find "MORE SHAPES" then "SOFTWARES AND DATABASES" and finaly "SOFTWARES". All UML DIAGRAMS are available here.

Chrome's remote debugging (USB debugging) not working for Samsung Galaxy S3 running android 4.3

For me, the menu item Inspect Devices wasn't available (not shown at all). But, simply browsing to chrome://inspect/#devices showed me my device and I was able to use the port forward etc. I have no idea why the menu item is not displayed.

Phone: Android Galaxy S4

OS: Mac OS X

Pycharm/Python OpenCV and CV2 install error

Try this. I am using Jupyter notebook (OS: Ubuntu 16.04 LTS on Google Cloud Platform + on Windows). Executed following command in the Jupyter notebook to install opencv:

!pip install opencv-contrib-python    #working on both Windows and Ubuntu

After successful installation you will get following message:

Successfully installed opencv-contrib-python-4.1.0.25

Now restart the kernel and try to import opencv as:

import cv2

The same command can be used to installed opencv on Windows as well.

SOLUTION 2: try following commands to install opencv: For Ubuntu: Run following command from terminal:

sudo apt-get install libsm6 libxrender1 libfontconfig1

Restart Jupyter notebook kernel and execute following command:

!pip install opencv-contrib-python

NOTE: You can run all the above commands from the terminal as well without using '!'.

What is Turing Complete?

I think the importance of the concept "Turing Complete" is in the the ability to identify a computing machine (not necessarily a mechanical/electrical "computer") that can have its processes be deconstructed into "simple" instructions, composed of simpler and simpler instructions, that a Universal machine could interpret and then execute.

I highly recommend The Annotated Turing

@Mark i think what you are explaining is a mix between the description of the Universal Turing Machine and Turing Complete.

Something that is Turing Complete, in a practical sense, would be a machine/process/computation able to be written and represented as a program, to be executed by a Universal Machine (a desktop computer). Though it doesn't take consideration for time or storage, as mentioned by others.

How to split long commands over multiple lines in PowerShell

In PowerShell 5 and PowerShell 5 ISE, it is also possible to use just Shift + Enter for multiline editing (instead of standard backticks ` at the end of each line):

PS> &"C:\Program Files\IIS\Microsoft Web Deploy\msdeploy.exe" # Shift+Enter
>>> -verb:sync # Shift+Enter
>>> -source:contentPath="c:\workspace\xxx\master\Build\_PublishedWebsites\xxx.Web" # Shift+Enter
>>> -dest:contentPath="c:\websites\xxx\wwwroot,computerName=192.168.1.1,username=administrator,password=xxx"

How do I declare a two dimensional array?

Or for larger arrays, all with the same value:

$m_by_n_array = array_fill(0, $n, array_fill(0, $m, $value);

will create an $m by $n array with everything set to $value.

How to programmatically set drawableLeft on Android button?

• `Kotlin Version`

Use below snippet to add a drawable left to the button:

val drawable = ContextCompat.getDrawable(context, R.drawable.ic_favorite_white_16dp)
button.setCompoundDrawablesWithIntrinsicBounds(drawable, null, null, null)

• `Important Point in Using Android Vector Drawable`

When you are using an android vector drawable and want to have backward compatibility for API below 21, add the following codes to:

In app level build.gradle:

android {
    defaultConfig {
        vectorDrawables.useSupportLibrary = true
    }
}

In Application class:

class MyApplication : Application() {

    override fun onCreate() {
        super.onCreate()

        AppCompatDelegate.setCompatVectorFromResourcesEnabled(true)
    }

}

Ternary operator in PowerShell

Try powershell's switch statement as an alternative, especially for variable assignment - multiple lines, but readable.

Example,

$WinVer = switch ( Test-Path $Env:windir\SysWOW64 ) {
  $true    { "64-bit" }
  $false   { "32-bit" }
}
"This version of Windows is $WinVer"

ADB Shell Input Events

By the way, if you are trying to find a way to send double quotes to the device, try the following:

adb shell input text '\"'

I'm not sure why there's no event code for quotes, but this workaround does the job. Also, if you're using MonkeyDevice (or ChimpChat) you should test each caracter before invoking monkeyDevice.type, otherwise you get nothing when you try to send "

Why am I getting the message, "fatal: This operation must be run in a work tree?"

In addition, apparently, this error will happen if you clone into NTFS Ram Drive.

LINQ extension methods - Any() vs. Where() vs. Exists()

foreach (var item in model.Where(x => !model2.Any(y => y.ID == x.ID)).ToList())
{
enter code here
}

same work you also can do with Contains

secondly Where is give you new list of values. thirdly using Exist is not a good practice, you can achieve your target from Any and contains like

EmployeeDetail _E = Db.EmployeeDetails.where(x=>x.Id==1).FirstOrDefault();

Hope this will clear your confusion.

Best way to find the intersection of multiple sets?

From Python version 2.6 on you can use multiple arguments to set.intersection(), like

u = set.intersection(s1, s2, s3)

If the sets are in a list, this translates to:

u = set.intersection(*setlist)

where *a_list is list expansion

Note that set.intersection is not a static method, but this uses the functional notation to apply intersection of the first set with the rest of the list. So if the argument list is empty this will fail.

To get total number of columns in a table in sql

Select Table_Name, Count(*) As ColumnCount
From Information_Schema.Columns
Group By Table_Name
Order By Table_Name

This code show a list of tables with a number of columns present in that table for a database.

If you want to know the number of column for a particular table in a database then simply use where clause e.g. where Table_Name='name_your_table'

Case insensitive access for generic dictionary

There is much simpler way:

using System;
using System.Collections.Generic;
....
var caseInsensitiveDictionary = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);

Upgrading PHP on CentOS 6.5 (Final)

Verify current version of PHP Type in the following to see the current PHP version:

php -v

Should output something like:

PHP 5.3.3 (cli) (built: Jul 9 2015 17:39:00) Copyright (c) 1997-2010 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
Install the Remi and EPEL RPM repositories

If you haven’t already done so, install the Remi and EPEL repositories

wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm && rpm -Uvh epel-release-latest-6.noarch.rpm



wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm && rpm -Uvh remi-release-6*.rpm

Enable the REMI repository globally:

nano /etc/yum.repos.d/remi.repo

Under the section that looks like [remi] make the following changes:

[remi]
name=Remi's RPM repository for Enterprise Linux 6 - $basearch
#baseurl=http://rpms.remirepo.net/enterprise/6/remi/$basearch/
mirrorlist=http://rpms.remirepo.net/enterprise/6/remi/mirror
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi

Also, under the section that looks like [remi-php55] make the following changes:

[remi-php56]
name=Remi's PHP 5.6 RPM repository for Enterprise Linux 6 - $basearch
#baseurl=http://rpms.remirepo.net/enterprise/6/php56/$basearch/
mirrorlist=http://rpms.remirepo.net/enterprise/6/php56/mirror
# WARNING: If you enable this repository, you must also enable "remi"
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi

Type CTRL-O to save and CTRL-X to close the editor

Upgrade PHP 5.3 to PHP 5.6 Now we can upgrade PHP. Simply type in the following command:

yum -y upgrade php*

Once the update has completed, let’s verify that you have PHP 5.6 installed:

php -v

Should see output similar to the following:

PHP 5.6.14 (cli) (built: Sep 30 2015 14:07:43) 
Copyright (c) 1997-2015 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2015 Zend Technologies

How to echo print statements while executing a sql script

This will give you are simple print within a sql script:

select 'This is a comment' AS '';

Alternatively, this will add some dynamic data to your status update if used directly after an update, delete, or insert command:

select concat ("Updated ", row_count(), " rows") as '';

How to use dashes in HTML-5 data-* attributes in ASP.NET MVC

In mvc 4 Could be rendered with Underscore(" _ ")

Razor:

@Html.ActionLink("Vote", "#", new { id = item.FileId, }, new { @class = "votes", data_fid = item.FileId, data_jid = item.JudgeID, })

Rendered Html

<a class="votes" data-fid="18587" data-jid="9" href="/Home/%23/18587">Vote</a>

Convert NULL to empty string - Conversion failed when converting from a character string to uniqueidentifier

SELECT Id   'PatientId',
       ISNULL(CONVERT(varchar(50),ParentId),'')  'ParentId'
FROM Patients

ISNULL always tries to return a result that has the same data type as the type of its first argument. So, if you want the result to be a string (varchar), you'd best make sure that's the type of the first argument.

COALESCE is usually a better function to use than ISNULL, since it considers all argument data types and applies appropriate precedence rules to determine the final resulting data type. Unfortunately, in this case, uniqueidentifier has higher precedence than varchar, so that doesn't help.

(It's also generally preferred because it extends to more than two arguments)

Insecure content in iframe on secure page

Based on generality of this question, I think, that you'll need to setup your own HTTPS proxy on some server online. Do the following steps:

Prepare your proxy server - install IIS, Apache
Get valid SSL certificate to avoid security errors (free from startssl.com for example)
Write a wrapper, which will download insecure content (how to below)
From your site/app get https://yourproxy.com/?page=http://insecurepage.com

If you simply download remote site content via file_get_contents or similiar, you can still have insecure links to content. You'll have to find them with regex and also replace. Images are hard to solve, but Ï found workaround here: http://foundationphp.com/tutorials/image_proxy.php

Note: While this solution may have worked in some browsers when it was written in 2014, it no longer works. Navigating or redirecting to an HTTP URL in an iframe embedded in an HTTPS page is not permitted by modern browsers, even if the frame started out with an HTTPS URL.

The best solution I created is to simply use google as the ssl proxy...

https://www.google.com/search?q=%http://yourhttpsite.com&btnI=Im+Feeling+Lucky

Tested and works in firefox.

Other Methods:

Use a Third party such as embed.ly (but it it really only good for well known http APIs).
Create your own redirect script on an https page you control (a simple javascript redirect on a relative linked page should do the trick. Something like: (you can use any langauge/method)

https://example.com That has a iframe linking to...

https://example.com/utilities/redirect.html Which has a simple js redirect script like...

document.location.href ="http://thenonsslsite.com";
Alternatively, you could add an RSS feed or write some reader/parser to read the http site and display it within your https site.
You could/should also recommend to the http site owner that they create an ssl connection. If for no other reason than it increases seo.

Unless you can get the http site owner to create an ssl certificate, the most secure and permanent solution would be to create an RSS feed grabing the content you need (presumably you are not actually 'doing' anything on the http site -that is to say not logging in to any system).

The real issue is that having http elements inside a https site represents a security issue. There are no completely kosher ways around this security risk so the above are just current work arounds.

Note, that you can disable this security measure in most browsers (yourself, not for others). Also note that these 'hacks' may become obsolete over time.

How to get POSTed JSON in Flask?

First of all, the .json attribute is a property that delegates to the request.get_json() method, which documents why you see None here.

You need to set the request content type to application/json for the .json property and .get_json() method (with no arguments) to work as either will produce None otherwise. See the Flask Request documentation:

This will contain the parsed JSON data if the mimetype indicates JSON (application/json, see is_json()), otherwise it will be None.

You can tell request.get_json() to skip the content type requirement by passing it the force=True keyword argument.

Note that if an exception is raised at this point (possibly resulting in a 400 Bad Request response), your JSON data is invalid. It is in some way malformed; you may want to check it with a JSON validator.

How to access the elements of a function's return array?

Your function is:

function data(){

$a = "abc";
$b = "def";
$c = "ghi";

return array($a, $b, $c);
}

It returns an array where position 0 is $a, position 1 is $b and position 2 is $c. You can therefore access $a by doing just this:

data()[0]

If you do $myvar = data()[0] and print $myvar, you will get "abc", which was the value assigned to $a inside the function.

Spring MVC UTF-8 Encoding

In addition to Benjamin's answer (which I've only skimmed), you need to make sure that your files are actually stored using the proper encoding (that would be UTF-8 for source code, JSPs etc., but note that Java Properties files must be encoded as ISO 8859-1 by definition).

The problem with this is that it's not possible to tell what encoding has been used to store a file. Your only option is to open the file using a specific encoding, and checking whether or not the content makes sense. You can also try to convert the file from the assumed encoding to the desired encoding using iconv - if that produces an error, your assumption was incorrect. So if you assume that hello.jsp is encoded as UTF-8, run "iconv -f UTF-16 -t UTF-8 hello.jsp" and check for errors.

If you should find out that your files are not properly encoded, you need to find out why. It's probably the editor or IDE you used to create the file. In case of Eclipse (and STS), make sure the Text File Encoding (Preferences / General / Workspace) is set to UTF-8 (it unfortunately defaults to your system's platform encoding).

What makes encoding problems so difficult to debug is that there's so many components involved (text editor, borwser, plus each and every software component in between, in some cases including a database), and each of them has the potential to introduce an error.

for each loop in groovy

This one worked for me:

def list = [1,2,3,4]
for(item in list){
    println item
}

Source: Wikia.

How should I use try-with-resources with JDBC?

As others have stated, your code is basically correct though the outer try is unneeded. Here are a few more thoughts.

`DataSource`

Other answers here are correct and good, such the accepted Answer by bpgergo. But none of the show the use of DataSource, commonly recommended over use of DriverManager in modern Java.

So for the sake of completeness, here is a complete example that fetches the current date from the database server. The database used here is Postgres. Any other database would work similarly. You would replace the use of org.postgresql.ds.PGSimpleDataSource with an implementation of DataSource appropriate to your database. An implementation is likely provided by your particular driver, or connection pool if you go that route.

A DataSource implementation need not be closed, because it is never “opened”. A DataSource is not a resource, is not connected to the database, so it is not holding networking connections nor resources on the database server. A DataSource is simply information needed when making a connection to the database, with the database server's network name or address, the user name, user password, and various options you want specified when a connection is eventually made. So your DataSource implementation object does not go inside your try-with-resources parentheses.

Nested try-with-resources

Your code makes proper used of nested try-with-resources statements.

Notice in the example code below that we also use the try-with-resources syntax twice, one nested inside the other. The outer try defines two resources: Connection and PreparedStatement. The inner try defines the ResultSet resource. This is a common code structure.

If an exception is thrown from the inner one, and not caught there, the ResultSet resource will automatically be closed (if it exists, is not null). Following that, the PreparedStatement will be closed, and lastly the Connection is closed. Resources are automatically closed in reverse order in which they were declared within the try-with-resource statements.

The example code here is overly simplistic. As written, it could be executed with a single try-with-resources statement. But in a real work you will likely be doing more work between the nested pair of try calls. For example, you may be extracting values from your user-interface or a POJO, and then passing those to fulfill ? placeholders within your SQL via calls to PreparedStatement::set… methods.

Syntax notes

Trailing semicolon

Notice that the semicolon trailing the last resource statement within the parentheses of the try-with-resources is optional. I include it in my own work for two reasons: Consistency and it looks complete, and it makes copy-pasting a mix of lines easier without having to worry about end-of-line semicolons. Your IDE may flag the last semicolon as superfluous, but there is no harm in leaving it.

Java 9 – Use existing vars in try-with-resources

New in Java 9 is an enhancement to try-with-resources syntax. We can now declare and populate the resources outside the parentheses of the try statement. I have not yet found this useful for JDBC resources, but keep it in mind in your own work.

`ResultSet` should close itself, but may not

In an ideal world the ResultSet would close itself as the documentation promises:

A ResultSet object is automatically closed when the Statement object that generated it is closed, re-executed, or used to retrieve the next result from a sequence of multiple results.

Unfortunately, in the past some JDBC drivers infamously failed to fulfill this promise. As a result, many JDBC programmers learned to explicitly close all their JDBC resources including Connection, PreparedStatement, and ResultSet too. The modern try-with-resources syntax has made doing so easier, and with more compact code. Notice that the Java team went to the bother of marking ResultSet as AutoCloseable, and I suggest we make use of that. Using a try-with-resources around all your JDBC resources makes your code more self-documenting as to your intentions.

Code example

package work.basil.example;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.time.LocalDate;
import java.util.Objects;

public class App
{
    public static void main ( String[] args )
    {
        App app = new App();
        app.doIt();
    }

    private void doIt ( )
    {
        System.out.println( "Hello World!" );

        org.postgresql.ds.PGSimpleDataSource dataSource = new org.postgresql.ds.PGSimpleDataSource();

        dataSource.setServerName( "1.2.3.4" );
        dataSource.setPortNumber( 5432 );

        dataSource.setDatabaseName( "example_db_" );
        dataSource.setUser( "scott" );
        dataSource.setPassword( "tiger" );

        dataSource.setApplicationName( "ExampleApp" );

        System.out.println( "INFO - Attempting to connect to database: " );
        if ( Objects.nonNull( dataSource ) )
        {
            String sql = "SELECT CURRENT_DATE ;";
            try (
                    Connection conn = dataSource.getConnection() ;
                    PreparedStatement ps = conn.prepareStatement( sql ) ;
            )
            {
                … make `PreparedStatement::set…` calls here.
                try (
                        ResultSet rs = ps.executeQuery() ;
                )
                {
                    if ( rs.next() )
                    {
                        LocalDate ld = rs.getObject( 1 , LocalDate.class );
                        System.out.println( "INFO - date is " + ld );
                    }
                }
            }
            catch ( SQLException e )
            {
                e.printStackTrace();
            }
        }

        System.out.println( "INFO - all done." );
    }
}

How to call controller from the button click in asp.net MVC 4

You are mixing razor and aspx syntax,if your view engine is razor just do this:

<button class="btn btn-info" type="button" id="addressSearch"   
          onclick="location.href='@Url.Action("List", "Search")'">

Shortest distance between a point and a line segment

A 2D and 3D solution

Consider a change of basis such that the line segment becomes (0, 0, 0)-(d, 0, 0) and the point (u, v, 0). The shortest distance occurs in that plane and is given by

    u = 0 -> d(A, C)
0 = u = d -> |v|
d = u     -> d(B, C)

(the distance to one of the endpoints or to the supporting line, depending on the projection to the line. The iso-distance locus is made of two half-circles and two line segments.)

In the above expression, d is the length of the segment AB, and u, v are respectivey the scalar product and (modulus of the) cross product of AB/d (unit vector in the direction of AB) and AC. Hence vectorially,

AB.AC = 0             -> |AC|
    0 = AB.AC = AB²   -> |ABxAC|/|AB|
          AB² = AB.AC -> |BC|

jQuery count child elements

$("#selected > ul > li").size()

or:

$("#selected > ul > li").length

How do I calculate power-of in C#?

Do not use Math.Pow

When i use

for (int i = 0; i < 10e7; i++)
{
    var x3 = x * x * x;
    var y3 = y * y * y;
}

It only takes 230 ms whereas the following takes incredible 7050 ms:

for (int i = 0; i < 10e7; i++)
{
    var x3 = Math.Pow(x, 3);
    var y3 = Math.Pow(x, 3);
}

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

struct stat st = {0};

if (stat("/some/directory", &st) == -1) {
    mkdir("/some/directory", 0700);
}

You can see the manual of these functions with the man 2 stat and man 2 mkdir commands.

Have log4net use application config file for configuration data

Have you tried adding a configsection handler to your app.config? e.g.

<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>

node and Error: EMFILE, too many open files

You're reading too many files. Node reads files asynchronously, it'll be reading all files at once. So you're probably reading the 10240 limit.

See if this works:

var fs = require('fs')
var events = require('events')
var util = require('util')
var path = require('path')

var FsPool = module.exports = function(dir) {
    events.EventEmitter.call(this)
    this.dir = dir;
    this.files = [];
    this.active = [];
    this.threads = 1;
    this.on('run', this.runQuta.bind(this))
};
// So will act like an event emitter
util.inherits(FsPool, events.EventEmitter);

FsPool.prototype.runQuta = function() {
    if(this.files.length === 0 && this.active.length === 0) {
        return this.emit('done');
    }
    if(this.active.length < this.threads) {
        var name = this.files.shift()

        this.active.push(name)
        var fileName = path.join(this.dir, name);
        var self = this;
        fs.stat(fileName, function(err, stats) {
            if(err)
                throw err;
            if(stats.isFile()) {
                fs.readFile(fileName, function(err, data) {
                    if(err)
                        throw err;
                    self.active.splice(self.active.indexOf(name), 1)
                    self.emit('file', name, data);
                    self.emit('run');

                });
            } else {
                self.active.splice(self.active.indexOf(name), 1)
                self.emit('dir', name);
                self.emit('run');
            }
        });
    }
    return this
};
FsPool.prototype.init = function() {
    var dir = this.dir;
    var self = this;
    fs.readdir(dir, function(err, files) {
        if(err)
            throw err;
        self.files = files
        self.emit('run');
    })
    return this
};
var fsPool = new FsPool(__dirname)

fsPool.on('file', function(fileName, fileData) {
    console.log('file name: ' + fileName)
    console.log('file data: ', fileData.toString('utf8'))

})
fsPool.on('dir', function(dirName) {
    console.log('dir name: ' + dirName)

})
fsPool.on('done', function() {
    console.log('done')
});
fsPool.init()

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