React Js conditionally applying class attributes

<div className={['foo', condition && 'bar'].filter(Boolean).join(' ')} />

.filter(Boolean) removes "falsey" values from the array. Since class names must be strings, anything other than that would not be included in the new filtered array.

_x000D_

console.log(  ['foo', true  && 'bar'].filter(Boolean).join(' ')  )
console.log(  ['foo', false && 'bar'].filter(Boolean).join(' ')  )

_x000D_

Above written as a function:

const cx = (...list) => list.filter(Boolean).join(' ')

// usage:
<div className={cx('foo', condition && 'bar')} />

_x000D_

var cx = (...list) => list.filter(Boolean).join(' ')
console.log(  cx('foo', 1 && 'bar', 1 && 'baz')  )
console.log(  cx('foo', 0 && 'bar', 1 && 'baz')  )
console.log(  cx('foo', 0 && 'bar', 0 && 'baz')  )

_x000D_

TempData keep() vs peek()

don't they both keep a value for another request?

Yes they do, but when the first one is void, the second one returns and object:

public void Keep(string key)
{
    _retainedKeys.Add(key); // just adds the key to the collection for retention
}

public object Peek(string key)
{
    object value;
    _data.TryGetValue(key, out value);
    return value; // returns an object without marking it for deletion
}

vertical align middle in <div>

How about adding line-height ?

#abc{
  font:Verdana, Geneva, sans-serif;
  font-size:18px;
  text-align:left;
  background-color:#0F0;
  height:50px;
  vertical-align:middle;
  line-height: 45px;
}

Fiddle, line-height

Or padding on #abc. This is the result with padding

Update

Add in your css :

#abc img{
   vertical-align: middle;
}

The result. Hope this what you looking for.

How do I get the color from a hexadecimal color code using .NET?

You could use the following code:

Color color = System.Drawing.ColorTranslator.FromHtml("#FFDFD991");

Select multiple rows with the same value(s)

The problem is GROUP BY - if you group results by Locus, you only get one result per locus.

Try:

SELECT * FROM Genes WHERE Locus = '3' AND Chromosome = '10';

If you prefer using HAVING syntax, then GROUP BY id or something that is not repeating in the result set.

Linux: where are environment variables stored?

The environment variables of a process exist at runtime, and are not stored in some file or so. They are stored in the process's own memory (that's where they are found to pass on to children). But there is a virtual file in

/proc/pid/environ

This file shows all the environment variables that were passed when calling the process (unless the process overwrote that part of its memory — most programs don't). The kernel makes them visible through that virtual file. One can list them. For example to view the variables of process 3940, one can do

cat /proc/3940/environ | tr '\0' '\n'

Each variable is delimited by a binary zero from the next one. tr replaces the zero into a newline.

How do you split and unsplit a window/view in Eclipse IDE?

This is possible with the menu items Window>Editor>Toggle Split Editor.

Current shortcut for splitting is:

Azerty keyboard:

Ctrl + _ for split horizontally, and

Ctrl + { for split vertically.

Qwerty US keyboard:

Ctrl + Shift + - (accessing _) for split horizontally, and

Ctrl + Shift + [ (accessing {) for split vertically.

MacOS - Qwerty US keyboard:

⌘ + Shift + - (accessing _) for split horizontally, and

⌘ + Shift + [ (accessing {) for split vertically.

On any other keyboard if a required key is unavailable (like { on a german Qwertz keyboard), the following generic approach may work:

Alt + ASCII code + Ctrl then release Alt

Example: ASCII for '{' = 123, so press 'Alt', '1', '2', '3', 'Ctrl' and release 'Alt', effectively typing '{' while 'Ctrl' is pressed, to split vertically.

Example of vertical split:

PS:

The menu items Window>Editor>Toggle Split Editor were added with Eclipse Luna 4.4 M4, as mentioned by Lars Vogel in "Split editor implemented in Eclipse M4 Luna"
The split editor is one of the oldest and most upvoted Eclipse bug! Bug 8009
The split editor functionality has been developed in Bug 378298, and will be available as of Eclipse Luna M4. The Note & Newsworthy of Eclipse Luna M4 will contain the announcement.

Pandas: change data type of Series to String

You can convert all elements of id to str using apply

df.id.apply(str)

0        123
1        512
2      zhub1
3    12354.3
4        129
5        753
6        295
7        610

Edit by OP:

I think the issue was related to the Python version (2.7.), this worked:

df['id'].astype(basestring)
0        123
1        512
2      zhub1
3    12354.3
4        129
5        753
6        295
7        610
Name: id, dtype: object

Curl command line for consuming webServices?

curl -H "Content-Type: text/xml; charset=utf-8" \
-H "SOAPAction:" \
-d @soap.txt -X POST http://someurl

Calling JMX MBean method from a shell script

You might want also to have a look at jmx4perl. It provides java-less access to a remote Java EE Server's MBeans. However, a small agent servlet needs to be installed on the target platform, which provides a restful JMX Access via HTTP with a JSON payload. (Version 0.50 will add an agentless mode by implementing a JSR-160 proxy).

Advantages are quick startup times compared to launching a local java JVM and ease of use. jmx4perl comes with a full set of Perl modules which can be easily used in your own scripts:

use JMX::Jmx4Perl;
use JMX::Jmx4Perl::Alias;   # Import certains aliases for MBeans

print "Memory Used: ",
      JMX::Jmx4Perl
          ->new(url => "http://localhost:8080/j4p")
          ->get_attribute(MEMORY_HEAP_USED);

You can also use alias for common MBean/Attribute/Operation combos (e.g. for most MXBeans). For additional features (Nagios-Plugin, XPath-like access to complex attribute types, ...), please refer to the documentation of jmx4perl.

Multiple Inheritance in C#

Since multiple inheritance is bad (it makes the source more complicated) C# does not provide such a pattern directly. But sometimes it would be helpful to have this ability.

C# and the .net CLR have not implemented MI because they have not concluded how it would inter-operate between C#, VB.net and the other languages yet, not because "it would make source more complex"

MI is a useful concept, the un-answered questions are ones like:- "What do you do when you have multiple common base classes in the different superclasses?

Perl is the only language I've ever worked with where MI works and works well. .Net may well introduce it one day but not yet, the CLR does already support MI but as I've said, there are no language constructs for it beyond that yet.

Until then you are stuck with Proxy objects and multiple Interfaces instead :(

set environment variable in python script

You can add elements to your environment by using

os.environ['LD_LIBRARY_PATH'] = 'my_path'

and run subprocesses in a shell (that uses your os.environ) by using

subprocess.call('sqsub -np ' + var1 + '/homedir/anotherdir/executable', shell=True)

Installing PHP Zip Extension

For php 7.3 on ubuntu 16.04

sudo apt-get install php7.3-zip

Best database field type for a URL

Most browsers will let you put very large amounts of data in a URL and thus lots of things end up creating very large URLs so if you are talking about anything more than the domain part of a URL you will need to use a TEXT column since the VARCHAR/CHAR are limited.

add controls vertically instead of horizontally using flow layout

I used a BoxLayout and set its second parameter as BoxLayout.Y_AXIS and it worked for me:

panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));

Handler vs AsyncTask vs Thread

Thread:

You can use the new Thread for long-running background tasks without impacting UI Thread. From java Thread, you can't update UI Thread.

Since normal Thread is not much useful for Android architecture, helper classes for threading have been introduced.

You can find answers to your queries in Threading performance documentation page.

Handler:

A Handler allows you to send and process Message and Runnable objects associated with a thread's MessageQueue. Each Handler instance is associated with a single thread and that thread's message queue.

There are two main uses for a Handler:

To schedule messages and runnables to be executed as some point in the future;
To enqueue an action to be performed on a different thread than your own.

AsyncTask:

AsyncTask enables proper and easy use of the UI thread. This class allows you to perform background operations and publish results on the UI thread without having to manipulate threads and/or handlers.

Drawbacks:

By default, an app pushes all of the AsyncTask objects it creates into a single thread. Therefore, they execute in serial fashion, and—as with the main thread—an especially long work packet can block the queue. Due to this reason, use AsyncTask to handle work items shorter than 5ms in duration.
AsyncTask objects are also the most common offenders for implicit-reference issues. AsyncTask objects present risks related to explicit references, as well.

HandlerThread:

You may need a more traditional approach to executing a block of work on a long-running thread (unlike AsyncTask, which should be used for 5ms workload), and some ability to manage that workflow manually. A handler thread is effectively a long-running thread that grabs work from a queue and operates on it.

ThreadPoolExecutor:

This class manages the creation of a group of threads, sets their priorities, and manages how work is distributed among those threads. As workload increases or decreases, the class spins up or destroys more threads to adjust to the workload.

If the workload is more and single HandlerThread is not suffice, you can go for ThreadPoolExecutor

However I would like to have a socket connection run in service. Should this be run in a handler or a thread, or even an AsyncTask? UI interaction is not necessary at all. Does it make a difference in terms of performance which I use?

Since UI interaction is not required, you may not go for AsyncTask. Normal threads are not much useful and hence HandlerThread is the best option. Since you have to maintain socket connection, Handler on the main thread is not useful at all. Create a HandlerThread and get a Handler from the looper of HandlerThread.

 HandlerThread handlerThread = new HandlerThread("SocketOperation");
 handlerThread.start();
 Handler requestHandler = new Handler(handlerThread.getLooper());
 requestHandler.post(myRunnable); // where myRunnable is your Runnable object.

If you want to communicate back to UI thread, you can use one more Handler to process response.

final Handler responseHandler = new Handler(Looper.getMainLooper()) {
        @Override
        public void handleMessage(Message msg) {
            //txtView.setText((String) msg.obj);
            Toast.makeText(MainActivity.this,
                    "Foreground task is completed:"+(String)msg.obj,
                    Toast.LENGTH_LONG)
                    .show();
        }
    };

in your Runnable, you can add

responseHandler.sendMessage(msg);

More details about implementation can be found here:

Android: Toast in a thread

Display encoded html with razor

I just got another case to display backslash \ with Razor and Java Script.

My @Model.AreaName looks like Name1\Name2\Name3 so when I display it all backslashes are gone and I see Name1Name2Name3

I found solution to fix it:

var areafullName =  JSON.parse("@Html.Raw(HttpUtility.JavaScriptStringEncode(JsonConvert.SerializeObject(Model.AreaName)))");

Don't forget to add @using Newtonsoft.Json on top of chtml page.

What is the difference between 'java', 'javaw', and 'javaws'?

From http://publib.boulder.ibm.com/infocenter/javasdk/v6r0/index.jsp?topic=%2Fcom.ibm.java.doc.user.aix32.60%2Fuser%2Fjava.html:

The javaw command is identical to java, except that javaw has no associated console window. Use javaw when you do not want a command prompt window to be displayed. The javaw launcher displays a window with error information if it fails.

And javaws is for Java web start applications, applets, or something like that, I would suspect.

How to check Spark Version

Addition to @Binary Nerd

If you are using Spark, use the following to get the Spark version:

spark-submit --version

How do I ZIP a file in C#, using no 3rd-party APIs?

I was in the same situation, wanting to .NET instead of a third party library. As another poster mentioned above, simply using the ZipPackage class (introduced in .NET 3.5) is not quite enough. There is an additional file that MUST be included in the archive in order for the ZipPackage to work. If this file is added, then the resulting ZIP package can be opened directly from Windows Explorer - no problem.

All you have to do is add the [Content_Types].xml file to the root of the archive with a "Default" node for every file extension you wish to include. Once added, I could browse the package from Windows Explorer or programmatically decompress and read its contents.

More information on the [Content_Types].xml file can be found here: http://msdn.microsoft.com/en-us/magazine/cc163372.aspx

Here is a sample of the [Content_Types].xml (must be named exactly) file:

<?xml version="1.0" encoding="utf-8" ?>
<Types xmlns=
    "http://schemas.openxmlformats.org/package/2006/content-types">
  <Default Extension="xml" ContentType="text/xml" /> 
  <Default Extension="htm" ContentType="text/html" /> 
  <Default Extension="html" ContentType="text/html" /> 
  <Default Extension="rels" ContentType=
    "application/vnd.openxmlformats-package.relationships+xml" /> 
  <Default Extension="jpg" ContentType="image/jpeg" /> 
  <Default Extension="png" ContentType="image/png" /> 
  <Default Extension="css" ContentType="text/css" /> 
</Types>

And the C# for creating a ZIP file:

var zipFilePath = "c:\\myfile.zip"; 
var tempFolderPath = "c:\\unzipped"; 

    using (Package package = ZipPackage.Open(zipFilePath, FileMode.Open, FileAccess.Read)) 
    { 
        foreach (PackagePart part in package.GetParts()) 
        { 
            var target = Path.GetFullPath(Path.Combine(tempFolderPath, part.Uri.OriginalString.TrimStart('/'))); 
            var targetDir = target.Remove(target.LastIndexOf('\\')); 

            if (!Directory.Exists(targetDir)) 
                Directory.CreateDirectory(targetDir); 

            using (Stream source = part.GetStream(FileMode.Open, FileAccess.Read)) 
            { 
                source.CopyTo(File.OpenWrite(target)); 
            } 
        } 
    }

Note:

This code uses the Stream.CopyTo method in .NET 4.0
This will become much simpler with the introduction of the ZipArchive class in .NET 4.5: http://msdn.microsoft.com/en-us/library/system.io.compression.ziparchive(v=vs.110).aspx

How to simplify a null-safe compareTo() implementation?

If you want a simple Hack:

arrlist.sort((o1, o2) -> {
    if (o1.getName() == null) o1.setName("");
    if (o2.getName() == null) o2.setName("");

    return o1.getName().compareTo(o2.getName());
})

if you want put nulls to end of the list just change this in above metod

return o2.getName().compareTo(o1.getName());

Parsing JSON giving "unexpected token o" error

Your data is already an object. No need to parse it. The javascript interpreter has already parsed it for you.

var cur_ques_details ={"ques_id":15,"ques_title":"jlkjlkjlkjljl"};
document.write(cur_ques_details['ques_title']);

How can I set response header on express.js assets

You can also add a middleware to add CORS headers, something like this would work:

/**
 * Adds CORS headers to the response
 *
 * {@link https://en.wikipedia.org/wiki/Cross-origin_resource_sharing}
 * {@link http://expressjs.com/en/4x/api.html#res.set}
 * @param {object} request the Request object
 * @param {object} response the Response object
 * @param {function} next function to continue execution
 * @returns {void}
 * @example
 * <code>
 * const express = require('express');
 * const corsHeaders = require('./middleware/cors-headers');
 *
 * const app = express();
 * app.use(corsHeaders);
 * </code>
 */
module.exports = (request, response, next) => {
    // http://expressjs.com/en/4x/api.html#res.set
    response.set({
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'DELETE,GET,PATCH,POST,PUT',
        'Access-Control-Allow-Headers': 'Content-Type,Authorization'
    });

    // intercept OPTIONS method
    if(request.method === 'OPTIONS') {
        response.send(200);
    } else {
        next();
    }
};

MySQL combine two columns into one column

It's work for me

SELECT CONCAT(column1, ' ' ,column2) AS newColumn;

How to get IntPtr from byte[] in C#

This should work but must be used within an unsafe context:

byte[] buffer = new byte[255];
fixed (byte* p = buffer)
{
    IntPtr ptr = (IntPtr)p;
    // do you stuff here
}

beware, you have to use the pointer in the fixed block! The gc can move the object once you are not anymore in the fixed block.

Fixing broken UTF-8 encoding

In my case, I found out by using "mb_convert_encoding" that the previous encoding was iso-8859-1 (which is latin1) then I fixed my problem by using an sql query :

UPDATE myDB.myTable SET myColumn = CAST(CAST(CONVERT(myColumn USING latin1) AS binary) AS CHAR)

However, it is stated in the mysql documentations that conversion may be lossy if the column contains characters that are not in both character sets.

Passing array in GET for a REST call

Collections are a resource so /appointments is fine as the resource.

Collections also typically offer filters via the querystring which is essentially what users=id1,id2... is.

So,

/appointments?users=id1,id2

is fine as a filtered RESTful resource.

Delete directories recursively in Java

public void deleteRecursive(File path){
    File[] c = path.listFiles();
    System.out.println("Cleaning out folder:" + path.toString());
    for (File file : c){
        if (file.isDirectory()){
            System.out.println("Deleting file:" + file.toString());
            deleteRecursive(file);
            file.delete();
        } else {
            file.delete();
        }
    }
    path.delete();
}

jQuery find() method not working in AngularJS directive

You can do it like this:

 var myApp = angular.module('myApp', [])
  .controller('Ctrl', ['$scope', function($scope) {
     $scope.aaa = 3432
 }])
 .directive('test', function () {
    return {
       link: function (scope, elm, attr) {
           var look = elm.children('#findme').addClass("addedclass");
           console.log(look);
        }
   };
});

<div ng-app="myApp" ng-controller="Ctrl">
   <div test>TEST Div
      <div id="findme">{{aaa}}</div>
   </div>
</div>

http://jsfiddle.net/FZGKA/133/

Javascript how to parse JSON array

The answer with the higher vote has a mistake. when I used it I find out it in line 3 :

var counter = jsonData.counters[i];

I changed it to :

var counter = jsonData[i].counters;

and it worked for me. There is a difference to the other answers in line 3:

var jsonData = JSON.parse(myMessage);
for (var i = 0; i < jsonData.counters.length; i++) {
    var counter = jsonData[i].counters;
    console.log(counter.counter_name);
}

Use :hover to modify the css of another class?

There are two approaches you can take, to have a hovered element affect (E) another element (F):

F is a child-element of E, or
F is a later-sibling (or sibling's descendant) element of E (in that E appears in the mark-up/DOM before F):

To illustrate the first of these options (F as a descendant/child of E):

.item:hover .wrapper {
    color: #fff;
    background-color: #000;
}?

To demonstrate the second option, F being a sibling element of E:

.item:hover ~ .wrapper {
    color: #fff;
    background-color: #000;
}?

In this example, if .wrapper was an immediate sibling of .item (with no other elements between the two) you could also use .item:hover + .wrapper.

JS Fiddle demonstration.

References:

CSS 2.1 selectors, at the W3.org.

Passing an array as a function parameter in JavaScript

While using spread operator we must note that it must be the last or only parameter passed. Else it will fail.

function callMe(...arr){ //valid arguments
    alert(arr);
}

function callMe(name, ...arr){ //valid arguments
    alert(arr);
}

function callMe(...arr, name){ //invalid arguments
    alert(arr);
}

If you need to pass an array as the starting argument you can do:

function callMe(arr, name){
    let newArr = [...arr];
    alert(newArr);
}

Load an image from a url into a PictureBox

Here's the solution I use. I can't remember why I couldn't just use the PictureBox.Load methods. I'm pretty sure it's because I wanted to properly scale & center the downloaded image into the PictureBox control. If I recall, all the scaling options on PictureBox either stretch the image, or will resize the PictureBox to fit the image. I wanted a properly scaled and centered image in the size I set for PictureBox.

Now, I just need to make a async version...

Here's my methods:

   #region Image Utilities

    /// <summary>
    /// Loads an image from a URL into a Bitmap object.
    /// Currently as written if there is an error during downloading of the image, no exception is thrown.
    /// </summary>
    /// <param name="url"></param>
    /// <returns></returns>
    public static Bitmap LoadPicture(string url)
    {
        System.Net.HttpWebRequest wreq;
        System.Net.HttpWebResponse wresp;
        Stream mystream;
        Bitmap bmp;

        bmp = null;
        mystream = null;
        wresp = null;
        try
        {
            wreq = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(url);
            wreq.AllowWriteStreamBuffering = true;

            wresp = (System.Net.HttpWebResponse)wreq.GetResponse();

            if ((mystream = wresp.GetResponseStream()) != null)
                bmp = new Bitmap(mystream);
        }
        catch
        {
            // Do nothing... 
        }
        finally
        {
            if (mystream != null)
                mystream.Close();

            if (wresp != null)
                wresp.Close();
        }

        return (bmp);
    }

    /// <summary>
    /// Takes in an image, scales it maintaining the proper aspect ratio of the image such it fits in the PictureBox's canvas size and loads the image into picture box.
    /// Has an optional param to center the image in the picture box if it's smaller then canvas size.
    /// </summary>
    /// <param name="image">The Image you want to load, see LoadPicture</param>
    /// <param name="canvas">The canvas you want the picture to load into</param>
    /// <param name="centerImage"></param>
    /// <returns></returns>

    public static Image ResizeImage(Image image, PictureBox canvas, bool centerImage ) 
    {
        if (image == null || canvas == null)
        {
            return null;
        }

        int canvasWidth = canvas.Size.Width;
        int canvasHeight = canvas.Size.Height;
        int originalWidth = image.Size.Width;
        int originalHeight = image.Size.Height;

        System.Drawing.Image thumbnail =
            new Bitmap(canvasWidth, canvasHeight); // changed parm names
        System.Drawing.Graphics graphic =
                     System.Drawing.Graphics.FromImage(thumbnail);

        graphic.InterpolationMode = InterpolationMode.HighQualityBicubic;
        graphic.SmoothingMode = SmoothingMode.HighQuality;
        graphic.PixelOffsetMode = PixelOffsetMode.HighQuality;
        graphic.CompositingQuality = CompositingQuality.HighQuality;

        /* ------------------ new code --------------- */

        // Figure out the ratio
        double ratioX = (double)canvasWidth / (double)originalWidth;
        double ratioY = (double)canvasHeight / (double)originalHeight;
        double ratio = ratioX < ratioY ? ratioX : ratioY; // use whichever multiplier is smaller

        // now we can get the new height and width
        int newHeight = Convert.ToInt32(originalHeight * ratio);
        int newWidth = Convert.ToInt32(originalWidth * ratio);

        // Now calculate the X,Y position of the upper-left corner 
        // (one of these will always be zero)
        int posX = Convert.ToInt32((canvasWidth - (image.Width * ratio)) / 2);
        int posY = Convert.ToInt32((canvasHeight - (image.Height * ratio)) / 2);

        if (!centerImage)
        {
            posX = 0;
            posY = 0;
        }
        graphic.Clear(Color.White); // white padding
        graphic.DrawImage(image, posX, posY, newWidth, newHeight);

        /* ------------- end new code ---------------- */

        System.Drawing.Imaging.ImageCodecInfo[] info =
                         ImageCodecInfo.GetImageEncoders();
        EncoderParameters encoderParameters;
        encoderParameters = new EncoderParameters(1);
        encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality,
                         100L);

        Stream s = new System.IO.MemoryStream();
        thumbnail.Save(s, info[1],
                          encoderParameters);

        return Image.FromStream(s);
    }

    #endregion

Here's the required includes. (Some might be needed by other code, but including all to be safe)

using System.Windows.Forms;
using System.Drawing.Drawing2D;
using System.IO;
using System.Drawing.Imaging;
using System.Text.RegularExpressions;
using System.Drawing;

How I generally use it:

 ImageUtil.ResizeImage(ImageUtil.LoadPicture( "http://someurl/img.jpg", pictureBox1, true);

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

You could set your channel to nil in addition to closing it. That way you can check if it is nil.

example in the playground: https://play.golang.org/p/v0f3d4DisCz

edit: This is actually a bad solution as demonstrated in the next example, because setting the channel to nil in a function would break it: https://play.golang.org/p/YVE2-LV9TOp

Excel - Sum column if condition is met by checking other column in same table

SUMIF didn't worked for me, had to use SUMIFS.

=SUMIFS(TableAmount,TableMonth,"January")

TableAmount is the table to sum the values, TableMonth the table where we search the condition and January, of course, the condition to meet.

Hope this can help someone!

Maximum value of maxRequestLength?

As per MSDN the default value is 4096 KB (4 MB).

UPDATE

As for the Maximum, since it is an int data type, then theoretically you can go up to 2,147,483,647. Also I wanted to make sure that you are aware that IIS 7 uses maxAllowedContentLength for specifying file upload size. By default it is set to 30000000 around 30MB and being an uint, it should theoretically allow a max of 4,294,967,295

Java's L number (long) specification

It seems like these would be good to have because (I assume) if you could specify the number you're typing in is a short then java wouldn't have to cast it

Since the parsing of literals happens at compile time, this is absolutely irrelevant in regard to performance. The only reason having short and byte suffixes would be nice is that it lead to more compact code.

Apply CSS to jQuery Dialog Buttons

Why not just inspect the generated markup, note the class on the button of choice and style it yourself?

Java ArrayList of Arrays?

BTW. you should prefer coding against an Interface.

private ArrayList<String[]> action = new ArrayList<String[]>();

Should be

private List<String[]> action = new ArrayList<String[]>();

What browsers support HTML5 WebSocket API?

Client side

Hixie-75:
- Chrome 4.0 + 5.0
- Safari 5.0.0
HyBi-00/Hixie-76:
- Chrome 6.0 - 13.0
- Safari 5.0.2 + 5.1
- iOS 4.2 + iOS 5
- Firefox 4.0 - support for WebSockets disabled. To enable it see here.
- Opera 11 - with support disabled. To enable it see here.
HyBi-07+:
- Chrome 14.0
- Firefox 6.0 - prefixed: MozWebSocket
- IE 9 - via downloadable Silverlight extension
HyBi-10:
- Chrome 14.0 + 15.0
- Firefox 7.0 + 8.0 + 9.0 + 10.0 - prefixed: MozWebSocket
- IE 10 (from Windows 8 developer preview)
HyBi-17/RFC 6455
- Chrome 16
- Firefox 11
- Opera 12.10 / Opera Mobile 12.1

Any browser with Flash can support WebSocket using the web-socket-js shim/polyfill.

See caniuse for the current status of WebSockets support in desktop and mobile browsers.

See the test reports from the WS testsuite included in Autobahn WebSockets for feature/protocol conformance tests.

Server side

It depends on which language you use.

In Java/Java EE:

Jetty 7.0 supports it (very easy to use) V 7.5 supports RFC6455 - Jetty 9.1 supports javax.websocket / JSR 356)
GlassFish 3.0 (very low level and sometimes complex), Glassfish 3.1 has new refactored Websocket Support which is more developer friendly V 3.1.2 supports RFC6455
Caucho Resin 4.0.2 (not yet tried) V 4.0.25 supports RFC6455
Tomcat 7.0.27 now supports it V 7.0.28 supports RFC6455
Tomcat 8.x has native support for websockets RFC6455 and is JSR 356 compliant
JSR 356 included in Java EE 7 will define the Java API for WebSocket, but is not yet stable and complete. See Arun GUPTA's article WebSocket and Java EE 7 - Getting Ready for JSR 356 (TOTD #181) and QCon presentation (from 00:37:36 to 00:46:53) for more information on progress. You can also look at Java websocket SDK.

Some other Java implementations:

Kaazing Gateway
jWebscoket
Netty
xLightWeb
Webbit
Atmosphere
Grizzly
Apache ActiveMQ V 5.6 supports RFC6455
Apache Camel V 2.10 supports RFC6455
JBoss HornetQ

In C#:

In PHP:

In Python:

pywebsockets
websockify
gevent-websocket, gevent-socketio and flask-sockets based on the former
Autobahn
Tornado

In C:

libwebsockets

In Node.js:

Socket.io : Socket.io also has serverside ports for Python, Java, Google GO, Rack
sockjs : sockjs also has serverside ports for Python, Java, Erlang and Lua
WebSocket-Node - Pure JavaScript Client & Server implementation of HyBi-10.

Vert.x (also known as Node.x) : A node like polyglot implementation running on a Java 7 JVM and based on Netty with :

Support for Ruby(JRuby), Java, Groovy, Javascript(Rhino/Nashorn), Scala, ...
True threading. (unlike Node.js)
Understands multiple network protocols out of the box including: TCP, SSL, UDP, HTTP, HTTPS, Websockets, SockJS as fallback for WebSockets

Pusher.com is a Websocket cloud service accessible through a REST API.

DotCloud cloud platform supports Websockets, and Java (Jetty Servlet Container), NodeJS, Python, Ruby, PHP and Perl programming languages.

Openshift cloud platform supports websockets, and Java (Jboss, Spring, Tomcat & Vertx), PHP (ZendServer & CodeIgniter), Ruby (ROR), Node.js, Python (Django & Flask) plateforms.

For other language implementations, see the Wikipedia article for more information.

The RFC for Websockets : RFC6455

How to add an element at the end of an array?

The OP says, for unknown reasons, "I prefer it without an arraylist or list."

If the type you are referring to is a primitive (you mention integers, but you don't say if you mean int or Integer), then you can use one of the NIO Buffer classes like java.nio.IntBuffer. These act a lot like StringBuffer does - they act as buffers for a list of the primitive type (buffers exist for all the primitives but not for Objects), and you can wrap a buffer around an array and/or extract an array from a buffer.

Note that the javadocs say, "The capacity of a buffer is never negative and never changes." It's still just a wrapper around an array, but one that's nicer to work with. The only way to effectively expand a buffer is to allocate() a larger one and use put() to dump the old buffer into the new one.

If it's not a primitive, you should probably just use List, or come up with a compelling reason why you can't or won't, and maybe somebody will help you work around it.

How to Copy Contents of One Canvas to Another Canvas Locally

Actually you don't have to create an image at all. drawImage() will accept a Canvas as well as an Image object.

//grab the context from your destination canvas
var destCtx = destinationCanvas.getContext('2d');

//call its drawImage() function passing it the source canvas directly
destCtx.drawImage(sourceCanvas, 0, 0);

Way faster than using an ImageData object or Image element.

Note that sourceCanvas can be a HTMLImageElement, HTMLVideoElement, or a HTMLCanvasElement. As mentioned by Dave in a comment below this answer, you cannot use a canvas drawing context as your source. If you have a canvas drawing context instead of the canvas element it was created from, there is a reference to the original canvas element on the context under context.canvas.

Here is a jsPerf to demonstrate why this is the only right way to clone a canvas: http://jsperf.com/copying-a-canvas-element

Replacing few values in a pandas dataframe column with another value

The easiest way is to use the replace method on the column. The arguments are a list of the things you want to replace (here ['ABC', 'AB']) and what you want to replace them with (the string 'A' in this case):

>>> df['BrandName'].replace(['ABC', 'AB'], 'A')
0    A
1    B
2    A
3    D
4    A

This creates a new Series of values so you need to assign this new column to the correct column name:

df['BrandName'] = df['BrandName'].replace(['ABC', 'AB'], 'A')

How to add a .dll reference to a project in Visual Studio

Copy the downloaded DLL file in a custom folder on your dev drive, then add the reference to your project using the Browse button in the Add Reference dialog.
Be sure that the new reference has the Copy Local = True.
The Add Reference dialog could be opened right-clicking on the References item in your project in Solution Explorer

UPDATE AFTER SOME YEARS
At the present time the best way to resolve all those problems is through the
Manage NuGet packages menu command of Visual Studio 2017/2019.
You can right click on the References node of your project and select that command. From the Browse tab search for the library you want to use in the NuGet repository, click on the item if found and then Install it. (Of course you need to have a package for that DLL and this is not guaranteed to exist)

Read about NuGet here

How to specify the JDK version in android studio?

For new Android Studio versions, go to C:\Program Files\Android\Android Studio\jre\bin(or to location of Android Studio installed files) and open command window at this location and type in following command in command prompt:-

java -version

Java random number with given length

int rand = (new Random()).getNextInt(900000) + 100000;

EDIT: Fixed off-by-1 error and removed invalid solution.

SQL Server : GROUP BY clause to get comma-separated values

SELECT  [ReportId], 
        SUBSTRING(d.EmailList,1, LEN(d.EmailList) - 1) EmailList
FROM
        (
            SELECT DISTINCT [ReportId]
            FROM Table1
        ) a
        CROSS APPLY
        (
            SELECT [Email] + ', ' 
            FROM Table1 AS B 
            WHERE A.[ReportId] = B.[ReportId]
            FOR XML PATH('')
        ) D (EmailList)

SQLFiddle Demo

How can I trigger the click event of another element in ng-click using angularjs?

I just came across this problem and have written a solution for those of you who are using Angular. You can write a custom directive composed of a container, a button, and an input element with type file. With CSS you then place the input over the custom button but with opacity 0. You set the containers height and width to exactly the offset width and height of the button and the input's height and width to 100% of the container.

the directive

angular.module('myCoolApp')
  .directive('fileButton', function () {
    return {
      templateUrl: 'components/directives/fileButton/fileButton.html',
      restrict: 'E',
      link: function (scope, element, attributes) {

        var container = angular.element('.file-upload-container');
        var button = angular.element('.file-upload-button');

        container.css({
            position: 'relative',
            overflow: 'hidden',
            width: button.offsetWidth,
            height: button.offsetHeight
        })

      }

    };
  });

a jade template if you are using jade

div(class="file-upload-container") 
    button(class="file-upload-button") +
    input#file-upload(class="file-upload-input", type='file', onchange="doSomethingWhenFileIsSelected()")

the same template in html if you are using html

<div class="file-upload-container">
   <button class="file-upload-button"></button>
   <input class="file-upload-input" id="file-upload" type="file" onchange="doSomethingWhenFileIsSelected()" /> 
</div>

the css

.file-upload-button {
    margin-top: 40px;
    padding: 30px;
    border: 1px solid black;
    height: 100px;
    width: 100px;
    background: transparent;
    font-size: 66px;
    padding-top: 0px;
    border-radius: 5px;
    border: 2px solid rgb(255, 228, 0); 
    color: rgb(255, 228, 0);
}
.file-upload-input {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

Determine the type of an object?

There are two built-in functions that help you identify the type of an object. You can use type() if you need the exact type of an object, and isinstance() to check an object’s type against something. Usually, you want to use isinstance() most of the times since it is very robust and also supports type inheritance.

To get the actual type of an object, you use the built-in type() function. Passing an object as the only parameter will return the type object of that object:

>>> type([]) is list
True
>>> type({}) is dict
True
>>> type('') is str
True
>>> type(0) is int
True

This of course also works for custom types:

>>> class Test1 (object):
        pass
>>> class Test2 (Test1):
        pass
>>> a = Test1()
>>> b = Test2()
>>> type(a) is Test1
True
>>> type(b) is Test2
True

Note that type() will only return the immediate type of the object, but won’t be able to tell you about type inheritance.

>>> type(b) is Test1
False

To cover that, you should use the isinstance function. This of course also works for built-in types:

>>> isinstance(b, Test1)
True
>>> isinstance(b, Test2)
True
>>> isinstance(a, Test1)
True
>>> isinstance(a, Test2)
False
>>> isinstance([], list)
True
>>> isinstance({}, dict)
True

isinstance() is usually the preferred way to ensure the type of an object because it will also accept derived types. So unless you actually need the type object (for whatever reason), using isinstance() is preferred over type().

The second parameter of isinstance() also accepts a tuple of types, so it’s possible to check for multiple types at once. isinstance will then return true, if the object is of any of those types:

>>> isinstance([], (tuple, list, set))
True

Difference between exit() and sys.exit() in Python

exit is a helper for the interactive shell - sys.exit is intended for use in programs.

The site module (which is imported automatically during startup, except if the -S command-line option is given) adds several constants to the built-in namespace (e.g. exit). They are useful for the interactive interpreter shell and should not be used in programs.

Technically, they do mostly the same: raising SystemExit. sys.exit does so in sysmodule.c:

static PyObject *
sys_exit(PyObject *self, PyObject *args)
{
    PyObject *exit_code = 0;
    if (!PyArg_UnpackTuple(args, "exit", 0, 1, &exit_code))
        return NULL;
    /* Raise SystemExit so callers may catch it or clean up. */
    PyErr_SetObject(PyExc_SystemExit, exit_code);
   return NULL;
}

While exit is defined in site.py and _sitebuiltins.py, respectively.

class Quitter(object):
    def __init__(self, name):
        self.name = name
    def __repr__(self):
        return 'Use %s() or %s to exit' % (self.name, eof)
    def __call__(self, code=None):
        # Shells like IDLE catch the SystemExit, but listen when their
        # stdin wrapper is closed.
        try:
            sys.stdin.close()
        except:
            pass
        raise SystemExit(code)
__builtin__.quit = Quitter('quit')
__builtin__.exit = Quitter('exit')

Note that there is a third exit option, namely os._exit, which exits without calling cleanup handlers, flushing stdio buffers, etc. (and which should normally only be used in the child process after a fork()).

Pandas split DataFrame by column value

Using "groupby" and list comprehension:

Storing all the split dataframe in list variable and accessing each of the seprated dataframe by their index.

DF = pd.DataFrame({'chr':["chr3","chr3","chr7","chr6","chr1"],'pos':[10,20,30,40,50],})
ans = [pd.DataFrame(y) for x, y in DF.groupby('chr', as_index=False)]

accessing the separated DF like this:

ans[0]
ans[1]
ans[len(ans)-1] # this is the last separated DF

accessing the column value of the separated DF like this:

ansI_chr=ans[i].chr

Postgres: How to convert a json string to text?

In 9.4.4 using the #>> operator works for me:

select to_json('test'::text) #>> '{}';

To use with a table column:

select jsoncol #>> '{}' from mytable;

Best way to compare 2 XML documents in Java

Xom has a Canonicalizer utility which turns your DOMs into a regular form, which you can then stringify and compare. So regardless of whitespace irregularities or attribute ordering, you can get regular, predictable comparisons of your documents.

This works especially well in IDEs that have dedicated visual String comparators, like Eclipse. You get a visual representation of the semantic differences between the documents.

Installing MySQL-python

this worked for me on python 3

pip install mysqlclient

Running Groovy script from the command line

#!/bin/sh
sed '1,2d' "$0"|$(which groovy) /dev/stdin; exit;

println("hello");

Difference between Running and Starting a Docker container

This is a very important question and the answer is very simple, but fundamental:

Run: create a new container of an image, and execute the container. You can create N clones of the same image. The command is: docker run IMAGE_ID and not docker run CONTAINER_ID

Start: Launch a container previously stopped. For example, if you had stopped a database with the command docker stop CONTAINER_ID, you can relaunch the same container with the command docker start CONTAINER_ID, and the data and settings will be the same.

CSS3 transitions inside jQuery .css()

Step 1) Remove the semi-colon, it's an object you're creating...

a(this).next().css({
    left       : c,
    transition : 'opacity 1s ease-in-out';
});

a(this).next().css({
    left       : c,
    transition : 'opacity 1s ease-in-out'
});

Step 2) Vendor-prefixes... no browsers use transition since it's the standard and this is an experimental feature even in the latest browsers:

a(this).next().css({
    left             : c,
    WebkitTransition : 'opacity 1s ease-in-out',
    MozTransition    : 'opacity 1s ease-in-out',
    MsTransition     : 'opacity 1s ease-in-out',
    OTransition      : 'opacity 1s ease-in-out',
    transition       : 'opacity 1s ease-in-out'
});

Here is a demo: http://jsfiddle.net/83FsJ/

Step 3) Better vendor-prefixes... Instead of adding tons of unnecessary CSS to elements (that will just be ignored by the browser) you can use jQuery to decide what vendor-prefix to use:

$('a').on('click', function () {
    var myTransition = ($.browser.webkit)  ? '-webkit-transition' :
                       ($.browser.mozilla) ? '-moz-transition' : 
                       ($.browser.msie)    ? '-ms-transition' :
                       ($.browser.opera)   ? '-o-transition' : 'transition',
        myCSSObj     = { opacity : 1 };

    myCSSObj[myTransition] = 'opacity 1s ease-in-out';
    $(this).next().css(myCSSObj);
});?

Here is a demo: http://jsfiddle.net/83FsJ/1/

Also note that if you specify in your transition declaration that the property to animate is opacity, setting a left property won't be animated.

How to Convert the value in DataTable into a string array in c#

    private string[] GetPrimaryKeysofTable(string TableName)
    {
        string stsqlCommand = "SELECT column_name FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE " +
                              "WHERE OBJECTPROPERTY(OBJECT_ID(constraint_name), 'IsPrimaryKey') = 1" +
                              "AND table_name = '" +TableName+ "'";
        SqlCommand command = new SqlCommand(stsqlCommand, Connection);
        SqlDataAdapter adapter = new SqlDataAdapter();
        adapter.SelectCommand = command;

        DataTable table = new DataTable();
        table.Locale = System.Globalization.CultureInfo.InvariantCulture;

        adapter.Fill(table);

        string[] result = new string[table.Rows.Count];
        int i = 0;
        foreach (DataRow dr in table.Rows)
        {
            result[i++] = dr[0].ToString();
        }

        return result;
    }

How to comment out a block of code in Python

Another editor-based solution: text "rectangles" in Emacs.

Highlight the code you want to comment out, then C-x-r-t #

To un-comment the code: highlight, then C-x-r-k

I use this all-day, every day. (Assigned to hot-keys, of course.)

This and powerful regex search/replace is the reason I tolerate Emacs's other "eccentricities".

How to convert an Instant to a date format?

Instant i = Instant.ofEpochSecond(cal.getTime);

Function is not defined - uncaught referenceerror

Thought I would mention this because it took a while for me to fix this issue and I couldn't find the answer anywhere on SO. The code I was working on worked for a co-worker but not for me (I was getting this same error). It worked for me in Chrome, but not in Edge.

I was able to get it working by clearing the cache in Edge.

This may not be the answer to this specific question, but I thought I would mention it in case it saves someone else a little time.

Automatically set appsettings.json for dev and release environments in asp.net core?

Update for .NET Core 3.0+

You can use CreateDefaultBuilder which will automatically build and pass a configuration object to your startup class:

WebHost.CreateDefaultBuilder(args).UseStartup<Startup>();

public class Startup
{
    public Startup(IConfiguration configuration) // automatically injected
    {
        Configuration = configuration;
    }
    public IConfiguration Configuration { get; }
    /* ... */
}

CreateDefaultBuilder automatically includes the appropriate appsettings.Environment.json file so add a separate appsettings file for each environment:
Then set the ASPNETCORE_ENVIRONMENT environment variable when running / debugging

How to set Environment Variables

Depending on your IDE, there are a couple places dotnet projects traditionally look for environment variables:

For Visual Studio go to Project > Properties > Debug > Environment Variables:
For Visual Studio Code, edit .vscode/launch.json > env:
Using Launch Settings, edit Properties/launchSettings.json > environmentVariables:

Which can also be selected from the Toolbar in Visual Studio
Using dotnet CLI, use the appropriate syntax for setting environment variables per your OS

Note: When an app is launched with dotnet run, launchSettings.json is read if available, and environmentVariables settings in launchSettings.json override environment variables.

How does `Host.CreateDefaultBuilder` work?

.NET Core 3.0 added Host.CreateDefaultBuilder under platform extensions which will provide a default initialization of IConfiguration which provides default configuration for the app in the following order:

appsettings.json using the JSON configuration provider.

appsettings.Environment.json using the JSON configuration provider. For example:

appsettings.Production.json or

appsettings.Development.json

App secrets when the app runs in the Development environment.

Environment variables using the Environment Variables configuration provider.

Command-line arguments using the Command-line configuration provider.

Angular 2 - NgFor using numbers instead collections

you can also use like that

export class SampleComponent {
   numbers:Array<any> = [];
   constructor() {
      this.numbers = Array.from({length:10},(v,k)=>k+1);
   }
}

HTML

<p *ngFor="let i of numbers">
   {{i}}
</p>

How to install ADB driver for any android device?

UNIVERSAL ADB DRIVER

I have thesame issue before but i solved it easily by just following this steps:

*connect your android phone in a debugging mode (to enable debugging mode goto settings scroll down About Phone scroll down tap seven times Build Number and it will automatically enable developer option turn on developer options and check USB debugging)

download Universal ADB Driver Installer

*choose Adb Driver Installer (Universal)

*install it *it will automatically detect your android device(any kind of brand) *chose the device and install

Error:java: invalid source release: 8 in Intellij. What does it mean?

For Gradle users having this issues, if nothing above helps this is what solved my problem - apply this declarations in your build.gradle files:

targetCompatibility = 1.6 //or 1.7;1.8 and so on
sourceCompatibility = 1.6 //or 1.7;1.8 and so on

Problem solved!

Convert NVARCHAR to DATETIME in SQL Server 2008

As your data is nvarchar there is no guarantee it will convert to datetime (as it may hold invalid date/time information) - so a way to handle this is to use ISDATE which I would use within a cross apply. (Cross apply results are reusable hence making is easier for the output formats.)

|                     YOUR_DT |             SQL2008 |
|-----------------------------|---------------------|
|         2013-08-29 13:55:48 | 29-08-2013 13:55:48 |
|    2013-08-29 13:55:48 blah |              (null) |
| 2013-08-29 13:55:48 rubbish |              (null) |

SELECT
  [Your_Dt]
, convert(varchar, ca1.dt_converted ,105) + ' ' + convert(varchar, ca1.dt_converted ,8) AS sql2008
FROM your_table
CROSS apply ( SELECT CASE WHEN isdate([Your_Dt]) = 1
                        THEN convert(datetime,[Your_Dt])
                        ELSE NULL
                     END
            ) AS ca1 (dt_converted)
;

Notes:

You could also introduce left([Your_Dt],19) to only get a string like '2013-08-29 13:55:48' from '2013-08-29 13:55:48 rubbish'

For that specific output I think you will need 2 sql 2008 date styles (105 & 8) sql2012 added for comparison

declare @your_dt as datetime2
set @your_dt = '2013-08-29 13:55:48'

select
  FORMAT(@your_dt, 'dd-MM-yyyy H:m:s') as sql2012
, convert(varchar, @your_dt ,105) + ' ' + convert(varchar, @your_dt ,8) as sql2008

|             SQL2012 |             SQL2008 |
|---------------------|---------------------|
| 29-08-2013 13:55:48 | 29-08-2013 13:55:48 |

pip: no module named _internal

I have the same problem on my virtual environment after upgrade python installation from 3.6 to 3.7 but only on vent globally pip work fine, to solve it I deactivate and delete my virtual environment after recreate again and now is fine, on venv:

deactivate
rm -rvf venv

and after recreate the virtual environment. I use mac OS 10.11, and python 3

How to create an XML document using XmlDocument?

Working with a dictionary ->level2 above comes from a dictionary in my case (just in case anybody will find it useful) Trying the first example I stumbled over this error: "This document already has a 'DocumentElement' node." I was inspired by the answer here

and edited my code: (xmlDoc.DocumentElement.AppendChild(body))

//a dictionary:
Dictionary<string, string> Level2Data 
{
    {"level2", "text"},
    {"level2", "other text"},
    {"same_level2", "more text"}
}
//xml Decalration:
XmlDocument xmlDoc = new XmlDocument();
XmlDeclaration xmlDeclaration = xmlDoc.CreateXmlDeclaration("1.0", "UTF-8", null);
XmlElement root = xmlDoc.DocumentElement;
xmlDoc.InsertBefore(xmlDeclaration, root);
// add body
XmlElement body = xmlDoc.CreateElement(string.Empty, "body", string.Empty);
xmlDoc.AppendChild(body);
XmlElement body = xmlDoc.CreateElement(string.Empty, "body", string.Empty);
xmlDoc.DocumentElement.AppendChild(body); //without DocumentElement ->ERR



foreach (KeyValuePair<string, string> entry in Level2Data)
{
    //write to xml: - it works version 1.
    XmlNode keyNode = xmlDoc.CreateElement(entry.Key); //open TAB
    keyNode.InnerText = entry.Value;
    body.AppendChild(keyNode); //close TAB

    //Write to xmml verdion 2: (uncomment the next 4 lines and comment the above 3 - version 1
    //XmlElement key = xmlDoc.CreateElement(string.Empty, entry.Key, string.Empty);
    //XmlText value = xmlDoc.CreateTextNode(entry.Value);
    //key.AppendChild(value);
    //body.AppendChild(key);
}

Both versions (1 and 2 inside foreach loop) give the output:

<?xml version="1.0" encoding="UTF-8"?>
<body>
    <level1>
        <level2>text</level2>
        <level2>ther text</level2>
         <same_level2>more text</same_level2>
    </level1>
</body>

(Note: third line "same level2" in dictionary can be also level2 as the others but I wanted to ilustrate the advantage of the dictionary - in my case I needed level2 with different names.

Create boolean column in MySQL with false as default value?

You can set a default value at creation time like:

CREATE TABLE Persons (
ID int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Age int,
Married boolean DEFAULT false);

Razor View Without Layout

You (and KMulligan) are misunderstanding _ViewStart pages.

_ViewStart will always execute, before your page starts.
It is intended to be used to initialize properties (such as Layout); it generally should not contain markup. (Since there is no way to override it).

The correct pattern is to make a separate layout page which calls RenderBody, and set the Layout property to point to this page in _ViewStart.

You can then change Layout in your content pages, and the changes will take effect.

What's the simplest way of detecting keyboard input in a script from the terminal?

Well, since the date of this question post, a Python library addressed this topic. pynput library, from Moses Palmer, is GREAT to catch keyboard and mouse events in a very simple way.

GitHub repository is here: https://github.com/moses-palmer/pynput
PyPi project is there: enter link description here
and installation of lib is easy: 'pip install pynput'

(mind the missing 'i' in pynput - I missed it too... ;-) )

Razor View throwing "The name 'model' does not exist in the current context"

For me, the issue was a conflicting .NET version in one of the libraries that I recently imported. The library I imported was compiled for 4.5.2 and the ASP.NET MVC site I imported it into targeted 4.5. After recompiling said lib for 4.5 the website would comppile.

Also, there were no compilation errors, but the issue was being reported as a "warning". So be sure to read all warnings if there are any.

How to check if a file exists in Ansible?

This can be achieved with the stat module to skip the task when file exists.

- hosts: servers
  tasks:
  - name: Ansible check file exists.
    stat:
      path: /etc/issue
    register: p
  - debug:
      msg: "File exists..."
    when: p.stat.exists
  - debug:
      msg: "File not found"
    when: p.stat.exists == False

Remove Android App Title Bar

In your res/values/styles.xml of modern Android Studio projects (2019/2020) you should be able to change the default parent theme

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">

I went one step further and had it look like this

<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
    <item name="android:windowFullscreen">true</item>
</style>

This is based on the code generated from the Microsoft PWA builder https://www.pwabuilder.com/

Passing Variable through JavaScript from one html page to another page

Without reading your code but just your scenario, I would solve by using localStorage. Here's an example, I'll use prompt() for short.

On page1:

window.onload = function() {
   var getInput = prompt("Hey type something here: ");
   localStorage.setItem("storageName",getInput);
}

On page2:

window.onload = alert(localStorage.getItem("storageName"));

You can also use cookies but localStorage allows much more spaces, and they aren't sent back to servers when you request pages.

HTML to PDF with Node.js

For those who don't want to install PhantomJS along with an instance of Chrome/Firefox on their server - or because the PhantomJS project is currently suspended, here's an alternative.

You can externalize the conversions to APIs to do the job. Many exists and varies but what you'll get is a reliable service with up-to-date features (I'm thinking CSS3, Web fonts, SVG, Canvas compatible).

For instance, with PDFShift (disclaimer, I'm the founder), you can do this simply by using the request package:

const request = require('request')
request.post(
    'https://api.pdfshift.io/v2/convert/',
    {
        'auth': {'user': 'your_api_key'},
        'json': {'source': 'https://www.google.com'},
        'encoding': null
    },
    (error, response, body) => {
        if (response === undefined) {
            return reject({'message': 'Invalid response from the server.', 'code': 0, 'response': response})
        }
        if (response.statusCode == 200) {
            // Do what you want with `body`, that contains the binary PDF
            // Like returning it to the client - or saving it as a file locally or on AWS S3
            return True
        }

        // Handle any errors that might have occured
    }
);

Java - Best way to print 2D array?

Adapting from https://stackoverflow.com/a/49428678/1527469 (to add indexes):

System.out.print(" ");
for (int row = 0; row < array[0].length; row++) {
    System.out.print("\t" + row );
}
System.out.println();
for (int row = 0; row < array.length; row++) {
    for (int col = 0; col < array[row].length; col++) {
        if (col < 1) {
            System.out.print(row);
            System.out.print("\t" + array[row][col]);
        } else {

            System.out.print("\t" + array[row][col]);
        }
    }
    System.out.println();
}

Linq select to new object

This is a great article for syntax needed to create new objects from a LINQ query.

But, if the assignments to fill in the fields of the object are anything more than simple assignments, for example, parsing strings to integers, and one of them fails, it is not possible to debug this. You can not create a breakpoint on any of the individual assignments.

And if you move all the assignments to a subroutine, and return a new object from there, and attempt to set a breakpoint in that routine, you can set a breakpoint in that routine, but the breakpoint will never be triggered.

So instead of:

var query2 = from c in doc.Descendants("SuggestionItem")
                select new SuggestionItem
                       { Phrase = c.Element("Phrase").Value
                         Blocked = bool.Parse(c.Element("Blocked").Value),
                         SeenCount = int.Parse(c.Element("SeenCount").Value)
                       };

var query2 = from c in doc.Descendants("SuggestionItem")
                         select new SuggestionItem(c);

I instead did this:

List<SuggestionItem> retList = new List<SuggestionItem>();

var query = from c in doc.Descendants("SuggestionItem") select c;

foreach (XElement item in query)
{
    SuggestionItem anItem = new SuggestionItem(item);
    retList.Add(anItem);
}

This allowed me to easily debug and figure out which assignment was failing. In this case, the XElement was missing a field I was parsing for to set in the SuggestionItem.

I ran into these gotchas with Visual Studio 2017 while writing unit tests for a new library routine.

char initial value in Java

you can initialize it to ' ' instead. Also, the reason that you received an error -1 being too many characters is because it is treating '-' and 1 as separate.

How to remove html special chars?

If you want to convert the HTML special characters and not just remove them as well as strip things down and prepare for plain text this was the solution that worked for me...

function htmlToPlainText($str){
    $str = str_replace('&nbsp;', ' ', $str);
    $str = html_entity_decode($str, ENT_QUOTES | ENT_COMPAT , 'UTF-8');
    $str = html_entity_decode($str, ENT_HTML5, 'UTF-8');
    $str = html_entity_decode($str);
    $str = htmlspecialchars_decode($str);
    $str = strip_tags($str);

    return $str;
}

$string = '<p>this is (&nbsp;) a test</p>
<div>Yes this is! &amp; does it get "processed"? </div>'

htmlToPlainText($string);
// "this is ( ) a test. Yes this is! & does it get processed?"`

html_entity_decode w/ ENT_QUOTES | ENT_XML1 converts things like ' htmlspecialchars_decode converts things like & html_entity_decode converts things like '< and strip_tags removes any HTML tags left over.

EDIT - Added str_replace(' ', ' ', $str); and several other html_entity_decode() as continued testing has shown a need for them.

Ternary operation in CoffeeScript

You may also write it in two statements if it mostly is true use:

a = 5
a = 10 if false

Or use a switch statement if you need more possibilities:

a = switch x
  when true then 5
  when false then 10

With a boolean it may be oversized but i find it very readable.

How can I exclude a directory from Visual Studio Code "Explore" tab?

There's this Explorer Exclude extension that exactly does this. https://marketplace.visualstudio.com/items?itemName=RedVanWorkshop.explorer-exclude-vscode-extension

It adds an option to hide current folder/file to the right click menu. It also adds a vertical tab Hidden Items to explorer menu where you can see currently hidden files & folders and can toggle them easily.

How do I get the information from a meta tag with JavaScript?

This code works for me

<meta name="text" property="text" content="This is text" />
<meta name="video" property="text" content="http://video.com/video33353.mp4" />

var x = document.getElementsByTagName("META");
    var txt = "";
    var i;
    for (i = 0; i < x.length; i++) {
        if (x[i].name=="video")
        {
             alert(x[i].content);
         }

    }

Example fiddle: http://jsfiddle.net/muthupandiant/ogfLwdwt/

Write to Windows Application Event Log

Yes, there is a way to write to the event log you are looking for. You don't need to create a new source, just simply use the existent one, which often has the same name as the EventLog's name and also, in some cases like the event log Application, can be accessible without administrative privileges*.

*Other cases, where you cannot access it directly, are the Security EventLog, for example, which is only accessed by the operating system.

I used this code to write directly to the event log Application:

using (EventLog eventLog = new EventLog("Application")) 
{
    eventLog.Source = "Application"; 
    eventLog.WriteEntry("Log message example", EventLogEntryType.Information, 101, 1); 
}

As you can see, the EventLog source is the same as the EventLog's name. The reason of this can be found in Event Sources @ Windows Dev Center (I bolded the part which refers to source name):

Each log in the Eventlog key contains subkeys called event sources. The event source is the name of the software that logs the event. It is often the name of the application or the name of a subcomponent of the application if the application is large. You can add a maximum of 16,384 event sources to the registry.

how to run a command at terminal from java program?

I know this question is quite old, but here's a library that encapsulates the ProcessBuilder api.

SQL query to make all data in a column UPPER CASE?

Permanent:

UPDATE
  MyTable
SET
  MyColumn = UPPER(MyColumn)

Temporary:

SELECT
  UPPER(MyColumn) AS MyColumn
FROM
  MyTable

EXC_BAD_ACCESS signal received

Just to add

Lynda.com has a fantastic DVD called

iPhone SDK Essential Training

and Chapter 6, Lesson 3 is all about EXEC_BAD_ACCESS and working with Zombies.

It was great for me to understand, not just the error code but how can I use Zombies to get more info on the released object.

How to drop unique in MySQL?

This may help others

alter table fuinfo drop index fuinfo_email_unique

How to view the dependency tree of a given npm module?

View All the metadata about npm module

npm view mongoose(module name)

View All Dependencies of module

npm view mongoose dependencies

View All Version or Versions module

npm view mongoose version
npm view mongoose versions

View All the keywords

npm view mongoose keywords

Include of non-modular header inside framework module

the same problem make crazy.finally, i find put the 'import xxx.h' in implementation instead of interface can fix the problem.And if you use Cocoapods to manager your project.you can add

s.user_target_xcconfig = { 'CLANG_ALLOW_NON_MODULAR_INCLUDES_IN_FRAMEWORK_MODULES' => 'YES' }

in your 'xxx.podspec' file.

Datetime in C# add days

You can add days to a date like this:

// add days to current **DateTime**
var addedDateTime = DateTime.Now.AddDays(10);

// add days to current **Date**
var addedDate = DateTime.Now.Date.AddDays(10);

// add days to any DateTime variable
var addedDateTime = anyDate.AddDay(10);

mysqldump Error 1045 Access denied despite correct passwords etc

mysqldump -h hostname -u username -P port -B database --no-create-info -p > output.sql

I think you should specify the args

Exiting out of a FOR loop in a batch file?

Assuming that the OP is invoking a batch file with cmd.exe, to properly break out of a for loop just goto a label;

Change this:

For /L %%f In (1,1,1000000) Do If Not Exist %%f Goto :EOF

To this:

For /L %%f In (1,1,1000000) Do If Not Exist %%f Goto:fileError
.. do something
.. then exit or do somethign else

:fileError
GOTO:EOF

Better still, add some error reporting:

set filename=
For /L %%f In (1,1,1000000) Do(
    set filename=%%f
    If Not Exist %%f set tempGoto:fileError
)
.. do something
.. then exit or do somethign else

:fileError
echo file does not exist '%filename%'
GOTO:EOF

I find this to be a helpful site about lesser known cmd.exe/DOS batch file functions and tricks: https://www.dostips.com/

Using an authorization header with Fetch in React Native

I had this identical problem, I was using django-rest-knox for authentication tokens. It turns out that nothing was wrong with my fetch method which looked like this:

...
    let headers = {"Content-Type": "application/json"};
    if (token) {
      headers["Authorization"] = `Token ${token}`;
    }
    return fetch("/api/instruments/", {headers,})
      .then(res => {
...

I was running apache.

What solved this problem for me was changing WSGIPassAuthorization to 'On' in wsgi.conf.

I had a Django app deployed on AWS EC2, and I used Elastic Beanstalk to manage my application, so in the django.config, I did this:

container_commands:
  01wsgipass:
    command: 'echo "WSGIPassAuthorization On" >> ../wsgi.conf'

How to pass an array into a function, and return the results with an array

You seem to be looking for pass-by-reference, to do that make your function look this way (note the ampersand):

function foo(&$array)
{
    $array[3]=$array[0]+$array[1]+$array[2];
}

Alternately, you can assign the return value of the function to a variable:

function foo($array)
{
    $array[3]=$array[0]+$array[1]+$array[2];
    return $array;
}

$waffles = foo($waffles)

Conversion hex string into ascii in bash command line

The echo -e must have been failing for you because of wrong escaping. The following code works fine for me on a similar output from your_program with arguments:

echo -e $(your_program with arguments | sed -e 's/0x\(..\)\.\?/\\x\1/g')

Please note however that your original hexstring consists of non-printable characters.

Unable to connect to mongodb Error: couldn't connect to server 127.0.0.1:27017 at src/mongo/shell/mongo.js:L112

First start mongod service then mongo or mongos

Setting width to wrap_content for TextView through code

TextView pf = new TextView(context);
pf.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

For different layouts like ConstraintLayout and others, they have their own LayoutParams, like so:

pf.setLayoutParams(new ConstraintLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));

parentView.addView(pf, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". error

I can also confirm this error.

Workaround: is to use external maven inside m2eclipse, instead of it's embedded maven.

That is done in three steps:

1 Install maven on local machine (the test-machine was Ubuntu 10.10)

mvn --version

Apache Maven 2.2.1 (rdebian-4) Java version: 1.6.0_20 Java home: /usr/lib/jvm/java-6-openjdk/jre Default locale: de_DE, platform encoding: UTF-8 OS name: "linux" version: "2.6.35-32-generic" arch: "amd64" Family: "unix"

2 Run maven externally link how to run maven from console

> cd path-to-pom.xml
> mvn test

    [INFO] Scanning for projects...
    [INFO] ------------------------------------------------------------------------
    [INFO] Building Simple
    [INFO]    task-segment: [test]
    [INFO] ------------------------------------------------------------------------
    [...]
    [INFO] Surefire report directory: [...]/workspace/Simple/target/surefire-reports
    
    -------------------------------------------------------
     T E S T S
    -------------------------------------------------------
    Running net.tverrbjelke.experiment.MainAppTest
    Hello World
    Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.042 sec
    
    Results :
    
    Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
    
    [INFO] ------------------------------------------------------------------------
    [INFO] BUILD SUCCESSFUL
    [INFO] ------------------------------------------------------------------------
    [...]

3 inside m2eclipse: switch from embedded maven to local maven

find out where local maven home installation dir is (mvn --version, or google for your MAVEN_HOME, for me this helped me that is /usr/share/maven2 )
in eclipse Menu->Window->Preferences->Maven->Installation-> enter that string. Then you should have switched to your new external maven.
then run your Project as e.g. "maven test".

The error-message should be gone.

Tricks to manage the available memory in an R session

As well as the more general memory management techniques given in the answers above, I always try to reduce the size of my objects as far as possible. For example, I work with very large but very sparse matrices, in other words matrices where most values are zero. Using the 'Matrix' package (capitalisation important) I was able to reduce my average object sizes from ~2GB to ~200MB as simply as:

my.matrix <- Matrix(my.matrix)

The Matrix package includes data formats that can be used exactly like a regular matrix (no need to change your other code) but are able to store sparse data much more efficiently, whether loaded into memory or saved to disk.

Additionally, the raw files I receive are in 'long' format where each data point has variables x, y, z, i. Much more efficient to transform the data into an x * y * z dimension array with only variable i.

Know your data and use a bit of common sense.

How to align a div inside td element using CSS class

div { margin: auto; }

This will center your div.

Div by itself is a blockelement. Therefor you need to define the style to the div how to behave.

How to set x axis values in matplotlib python?

The scaling on your example figure is a bit strange but you can force it by plotting the index of each x-value and then setting the ticks to the data points:

import matplotlib.pyplot as plt
x = [0.00001,0.001,0.01,0.1,0.5,1,5]
# create an index for each tick position
xi = list(range(len(x)))
y = [0.945,0.885,0.893,0.9,0.996,1.25,1.19]
plt.ylim(0.8,1.4)
# plot the index for the x-values
plt.plot(xi, y, marker='o', linestyle='--', color='r', label='Square') 
plt.xlabel('x')
plt.ylabel('y') 
plt.xticks(xi, x)
plt.title('compare')
plt.legend() 
plt.show()

javascript function wait until another function to finish

In my opinion, deferreds/promises (as you have mentionned) is the way to go, rather than using timeouts.

Here is an example I have just written to demonstrate how you could do it using deferreds/promises.

Take some time to play around with deferreds. Once you really understand them, it becomes very easy to perform asynchronous tasks.

Hope this helps!

$(function(){
    function1().done(function(){
        // function1 is done, we can now call function2
        console.log('function1 is done!');

        function2().done(function(){
            //function2 is done
            console.log('function2 is done!');
        });
    });
});

function function1(){
    var dfrd1 = $.Deferred();
    var dfrd2= $.Deferred();

    setTimeout(function(){
        // doing async stuff
        console.log('task 1 in function1 is done!');
        dfrd1.resolve();
    }, 1000);

    setTimeout(function(){
        // doing more async stuff
        console.log('task 2 in function1 is done!');
        dfrd2.resolve();
    }, 750);

    return $.when(dfrd1, dfrd2).done(function(){
        console.log('both tasks in function1 are done');
        // Both asyncs tasks are done
    }).promise();
}

function function2(){
    var dfrd1 = $.Deferred();
    setTimeout(function(){
        // doing async stuff
        console.log('task 1 in function2 is done!');
        dfrd1.resolve();
    }, 2000);
    return dfrd1.promise();
}

image.onload event and browser cache

I found that you can just do this in Chrome:

  $('.onload-fadein').each(function (k, v) {
    v.onload = function () {
        $(this).animate({opacity: 1}, 2000);
    };
    v.src = v.src;
});

Setting the .src to itself will trigger the onload event.

Spell Checker for Python

I'd recommend starting by carefully reading this post by Peter Norvig. (I had to something similar and I found it extremely useful.)

The following function, in particular has the ideas that you now need to make your spell checker more sophisticated: splitting, deleting, transposing, and inserting the irregular words to 'correct' them.

def edits1(word):
   splits     = [(word[:i], word[i:]) for i in range(len(word) + 1)]
   deletes    = [a + b[1:] for a, b in splits if b]
   transposes = [a + b[1] + b[0] + b[2:] for a, b in splits if len(b)>1]
   replaces   = [a + c + b[1:] for a, b in splits for c in alphabet if b]
   inserts    = [a + c + b     for a, b in splits for c in alphabet]
   return set(deletes + transposes + replaces + inserts)

Note: The above is one snippet from Norvig's spelling corrector

And the good news is that you can incrementally add to and keep improving your spell-checker.

Hope that helps.

Getting the PublicKeyToken of .Net assemblies

As an alternative, you can also use linq like this -

    string key = string.Join ("",assembly
                                .GetName()
                                .GetPublicKeyToken()
                                .Select (b => b.ToString ("x2")));

Code for download video from Youtube on Java, Android

3 steps:

Check the sorce code (HTML) of YouTube, you'll get the link like this (http%253A%252F%252Fo-o.preferred.telemar-cnf1.v18.lscache6.c.youtube.com%252Fvideoplayback ...);
Decode the url (remove the codes %2B,%25 etc), create a decoder with the codes: http://www.w3schools.com/tags/ref_urlencode.asp and use the function Uri.decode(url) to replace invalid escaped octets;

Use the code to download stream:

URL u = null;
InputStream is = null;  

try {
    u = new URL(url);
    is = u.openStream(); 
    HttpURLConnection huc = (HttpURLConnection)u.openConnection(); //to know the size of video
    int size = huc.getContentLength();                 

    if(huc != null) {
        String fileName = "FILE.mp4";
        String storagePath = Environment.getExternalStorageDirectory().toString();
        File f = new File(storagePath,fileName);

        FileOutputStream fos = new FileOutputStream(f);
        byte[] buffer = new byte[1024];
        int len1 = 0;
        if(is != null) {
            while ((len1 = is.read(buffer)) > 0) {
                fos.write(buffer,0, len1);  
            }
        }
        if(fos != null) {
            fos.close();
        }
    }                       
} catch (MalformedURLException mue) {
    mue.printStackTrace();
} catch (IOException ioe) {
    ioe.printStackTrace();
} finally {
    try {               
        if(is != null) {
            is.close();
        }
    } catch (IOException ioe) {
        // just going to ignore this one
    }
}

That's all, most of stuff you'll find on the web!!!

android activity has leaked window com.android.internal.policy.impl.phonewindow$decorview Issue

In my case finish() executed immediately after a dialog has shown.

How can I align the columns of tables in Bash?

Just in case someone wants to do that in PHP I posted a gist on Github

https://gist.github.com/redestructa/2a7691e7f3ae69ec5161220c99e2d1b3

simply call:

$output = $tablePrinter->printLinesIntoArray($items, ['title', 'chilProp2']);

you may need to adapt the code if you are using a php version older than 7.2

after that call echo or writeLine depending on your environment.

How can I count text lines inside an DOM element? Can I?

Try this solution:

function calculateLineCount(element) {
  var lineHeightBefore = element.css("line-height"),
      boxSizing        = element.css("box-sizing"),
      height,
      lineCount;

  // Force the line height to a known value
  element.css("line-height", "1px");

  // Take a snapshot of the height
  height = parseFloat(element.css("height"));

  // Reset the line height
  element.css("line-height", lineHeightBefore);

  if (boxSizing == "border-box") {
    // With "border-box", padding cuts into the content, so we have to subtract
    // it out
    var paddingTop    = parseFloat(element.css("padding-top")),
        paddingBottom = parseFloat(element.css("padding-bottom"));

    height -= (paddingTop + paddingBottom);
  }

  // The height is the line count
  lineCount = height;

  return lineCount;
}

You can see it in action here: https://jsfiddle.net/u0r6avnt/

Try resizing the panels on the page (to make the right side of the page wider or shorter) and then run it again to see that it can reliably tell how many lines there are.

This problem is harder than it looks, but most of the difficulty comes from two sources:

Text rendering is too low-level in browsers to be directly queried from JavaScript. Even the CSS ::first-line pseudo-selector doesn't behave quite like other selectors do (you can't invert it, for example, to apply styling to all but the first line).
Context plays a big part in how you calculate the number of lines. For example, if line-height was not explicitly set in the hierarchy of the target element, you might get "normal" back as a line height. In addition, the element might be using box-sizing: border-box and therefore be subject to padding.

My approach minimizes #2 by taking control of the line-height directly and factoring in the box sizing method, leading to a more deterministic result.

No numeric types to aggregate - change in groupby() behaviour?

I got this error generating a data frame consisting of timestamps and data:

df = pd.DataFrame({'data':value}, index=pd.DatetimeIndex(timestamp))

Adding the suggested solution works for me:

df = pd.DataFrame({'data':value}, index=pd.DatetimeIndex(timestamp), dtype=float))

Thanks Chang She!

Example:

                     data
2005-01-01 00:10:00  7.53
2005-01-01 00:20:00  7.54
2005-01-01 00:30:00  7.62
2005-01-01 00:40:00  7.68
2005-01-01 00:50:00  7.81
2005-01-01 01:00:00  7.95
2005-01-01 01:10:00  7.96
2005-01-01 01:20:00  7.95
2005-01-01 01:30:00  7.98
2005-01-01 01:40:00  8.06
2005-01-01 01:50:00  8.04
2005-01-01 02:00:00  8.06
2005-01-01 02:10:00  8.12
2005-01-01 02:20:00  8.12
2005-01-01 02:30:00  8.25
2005-01-01 02:40:00  8.27
2005-01-01 02:50:00  8.17
2005-01-01 03:00:00  8.21
2005-01-01 03:10:00  8.29
2005-01-01 03:20:00  8.31
2005-01-01 03:30:00  8.25
2005-01-01 03:40:00  8.19
2005-01-01 03:50:00  8.17
2005-01-01 04:00:00  8.18
                     data
2005-01-01 00:00:00  7.636000
2005-01-01 01:00:00  7.990000
2005-01-01 02:00:00  8.165000
2005-01-01 03:00:00  8.236667
2005-01-01 04:00:00  8.180000

CSS background opacity with rgba not working in IE 8

After searching a lot, I found the following solution which is working in my cases:

.opacity_30{
    background:rgb(255,255,255); /* Fallback for web browsers that don't support neither RGBa nor filter */ 
    background: transparent\9; /* Backslash 9 hack to prevent IE 8 from falling into the fallback */
    background:rgba(255,255,255,0.3); /* RGBa declaration for modern browsers */
    -ms-filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#4CFFFFFF,endColorstr=#4CFFFFFF); /* IE 8 suppoerted; Sometimes Hover issues may occur, then we can use transparent repeating background image :( */
    filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#4CFFFFFF,endColorstr=#4CFFFFFF); /* needed for IE 6-7 */
    zoom: 1; /* Hack needed for IE 6-8 */
}

/* To avoid IE more recent versions to apply opacity twice (once with rgba and once with filter), we need the following CSS3 selector hack (not supported by IE 6-8) */
.opacity_30:nth-child(n) {
    filter: none;
}

*Important: To calculate ARGB(for IEs) from RGBA, we can use online tools:

Easiest way to rotate by 90 degrees an image using OpenCV?

Here's my EmguCV (a C# port of OpenCV) solution:

public static Image<TColor, TDepth> Rotate90<TColor, TDepth>(this Image<TColor, TDepth> img)
    where TColor : struct, IColor
    where TDepth : new()
{
    var rot = new Image<TColor, TDepth>(img.Height, img.Width);
    CvInvoke.cvTranspose(img.Ptr, rot.Ptr);
    rot._Flip(FLIP.HORIZONTAL);
    return rot;
}

public static Image<TColor, TDepth> Rotate180<TColor, TDepth>(this Image<TColor, TDepth> img)
    where TColor : struct, IColor
    where TDepth : new()
{
    var rot = img.CopyBlank();
    rot = img.Flip(FLIP.VERTICAL);
    rot._Flip(FLIP.HORIZONTAL);
    return rot;
}

public static void _Rotate180<TColor, TDepth>(this Image<TColor, TDepth> img)
    where TColor : struct, IColor
    where TDepth : new()
{
    img._Flip(FLIP.VERTICAL);
    img._Flip(FLIP.HORIZONTAL);
}

public static Image<TColor, TDepth> Rotate270<TColor, TDepth>(this Image<TColor, TDepth> img)
    where TColor : struct, IColor
    where TDepth : new()
{
    var rot = new Image<TColor, TDepth>(img.Height, img.Width);
    CvInvoke.cvTranspose(img.Ptr, rot.Ptr);
    rot._Flip(FLIP.VERTICAL);
    return rot;
}

Shouldn't be too hard to translate it back into C++.

Numpy - Replace a number with NaN

A[A==NDV]=numpy.nan

A==NDV will produce a boolean array that can be used as an index for A

Best way to replace multiple characters in a string?

advanced way using regex

import re
text = "hello ,world!"
replaces = {"hello": "hi", "world":" 2020", "!":"."}
regex = re.sub("|".join(replaces.keys()), lambda match: replaces[match.string[match.start():match.end()]], text)
print(regex)

How to write a simple Java program that finds the greatest common divisor between two numbers?

public static int GCD(int x, int y) {   
    int r;
    while (y!=0) {
        r = x%y;
        x = y;
        y = r;
    }
    return x;
}

'Invalid update: invalid number of rows in section 0

In my case issue was that numberOfRowsInSection was returning similar number of rows after calling tableView.deleteRows(...).

Since this was the required behaviour in my case, I ended up calling tableView.reloadData() instead of tableView.deleteRows(...) in cases where numberOfRowsInSection will remain same after deleting a row.

NSURLConnection Using iOS Swift

Check Below Codes :

1. SynchronousRequest

Swift 1.2

    let urlPath: String = "YOUR_URL_HERE"
    var url: NSURL = NSURL(string: urlPath)!
    var request1: NSURLRequest = NSURLRequest(URL: url)
    var response: AutoreleasingUnsafeMutablePointer<NSURLResponse?>=nil
    var dataVal: NSData =  NSURLConnection.sendSynchronousRequest(request1, returningResponse: response, error:nil)!
    var err: NSError
    println(response)
    var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(dataVal, options: NSJSONReadingOptions.MutableContainers, error: &err) as? NSDictionary
    println("Synchronous\(jsonResult)")

Swift 2.0 +

let urlPath: String = "YOUR_URL_HERE"
    let url: NSURL = NSURL(string: urlPath)!
    let request1: NSURLRequest = NSURLRequest(URL: url)
    let response: AutoreleasingUnsafeMutablePointer<NSURLResponse?>=nil


    do{

        let dataVal = try NSURLConnection.sendSynchronousRequest(request1, returningResponse: response)

            print(response)
            do {
                if let jsonResult = try NSJSONSerialization.JSONObjectWithData(dataVal, options: []) as? NSDictionary {
                    print("Synchronous\(jsonResult)")
                }
            } catch let error as NSError {
                print(error.localizedDescription)
            }



    }catch let error as NSError
    {
         print(error.localizedDescription)
    }

2. AsynchonousRequest

Swift 1.2

let urlPath: String = "YOUR_URL_HERE"
    var url: NSURL = NSURL(string: urlPath)!
    var request1: NSURLRequest = NSURLRequest(URL: url)
    let queue:NSOperationQueue = NSOperationQueue()
    NSURLConnection.sendAsynchronousRequest(request1, queue: queue, completionHandler:{ (response: NSURLResponse!, data: NSData!, error: NSError!) -> Void in
        var err: NSError
        var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
        println("Asynchronous\(jsonResult)")
       })

Swift 2.0 +

let urlPath: String = "YOUR_URL_HERE"
    let url: NSURL = NSURL(string: urlPath)!
    let request1: NSURLRequest = NSURLRequest(URL: url)
    let queue:NSOperationQueue = NSOperationQueue()

    NSURLConnection.sendAsynchronousRequest(request1, queue: queue, completionHandler:{ (response: NSURLResponse?, data: NSData?, error: NSError?) -> Void in

        do {
            if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {
                print("ASynchronous\(jsonResult)")
            }
        } catch let error as NSError {
            print(error.localizedDescription)
        }


    })

3. As usual URL connection

Swift 1.2

    var dataVal = NSMutableData()
    let urlPath: String = "YOUR URL HERE"
    var url: NSURL = NSURL(string: urlPath)!
    var request: NSURLRequest = NSURLRequest(URL: url)
    var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: true)!
    connection.start()

Then

 func connection(connection: NSURLConnection!, didReceiveData data: NSData!){
    self.dataVal?.appendData(data)
}


func connectionDidFinishLoading(connection: NSURLConnection!)
{
    var error: NSErrorPointer=nil

    var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(dataVal!, options: NSJSONReadingOptions.MutableContainers, error: error) as NSDictionary

    println(jsonResult)



}

Swift 2.0 +

   var dataVal = NSMutableData()
    let urlPath: String = "YOUR URL HERE"
    var url: NSURL = NSURL(string: urlPath)!
    var request: NSURLRequest = NSURLRequest(URL: url)
    var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: true)!
    connection.start()

Then

func connection(connection: NSURLConnection!, didReceiveData data: NSData!){
    dataVal.appendData(data)
}


func connectionDidFinishLoading(connection: NSURLConnection!)
{

    do {
        if let jsonResult = try NSJSONSerialization.JSONObjectWithData(dataVal, options: []) as? NSDictionary {
            print(jsonResult)
        }
    } catch let error as NSError {
        print(error.localizedDescription)
    }

}

4. Asynchronous POST Request

Swift 1.2

    let urlPath: String = "YOUR URL HERE"
    var url: NSURL = NSURL(string: urlPath)!
    var request1: NSMutableURLRequest = NSMutableURLRequest(URL: url)

    request1.HTTPMethod = "POST"
     var stringPost="deviceToken=123456" // Key and Value

    let data = stringPost.dataUsingEncoding(NSUTF8StringEncoding)

    request1.timeoutInterval = 60
    request1.HTTPBody=data
    request1.HTTPShouldHandleCookies=false

    let queue:NSOperationQueue = NSOperationQueue()

     NSURLConnection.sendAsynchronousRequest(request1, queue: queue, completionHandler:{ (response: NSURLResponse!, data: NSData!, error: NSError!) -> Void in


        var err: NSError

        var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
        println("AsSynchronous\(jsonResult)")


        })

Swift 2.0 +

let urlPath: String = "YOUR URL HERE"
    let url: NSURL = NSURL(string: urlPath)!
    let request1: NSMutableURLRequest = NSMutableURLRequest(URL: url)

    request1.HTTPMethod = "POST"
    let stringPost="deviceToken=123456" // Key and Value

    let data = stringPost.dataUsingEncoding(NSUTF8StringEncoding)

    request1.timeoutInterval = 60
    request1.HTTPBody=data
    request1.HTTPShouldHandleCookies=false

    let queue:NSOperationQueue = NSOperationQueue()

    NSURLConnection.sendAsynchronousRequest(request1, queue: queue, completionHandler:{ (response: NSURLResponse?, data: NSData?, error: NSError?) -> Void in

        do {
            if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {
                print("ASynchronous\(jsonResult)")
            }
        } catch let error as NSError {
            print(error.localizedDescription)
        }


    })

5. Asynchronous GET Request

Swift 1.2

    let urlPath: String = "YOUR URL HERE"
    var url: NSURL = NSURL(string: urlPath)!
    var request1: NSMutableURLRequest = NSMutableURLRequest(URL: url)

    request1.HTTPMethod = "GET"
    request1.timeoutInterval = 60
    let queue:NSOperationQueue = NSOperationQueue()

     NSURLConnection.sendAsynchronousRequest(request1, queue: queue, completionHandler:{ (response: NSURLResponse!, data: NSData!, error: NSError!) -> Void in


        var err: NSError

        var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
        println("AsSynchronous\(jsonResult)")


        })

Swift 2.0 +

let urlPath: String = "YOUR URL HERE"
    let url: NSURL = NSURL(string: urlPath)!
    let request1: NSMutableURLRequest = NSMutableURLRequest(URL: url)

    request1.HTTPMethod = "GET"
    let queue:NSOperationQueue = NSOperationQueue()

    NSURLConnection.sendAsynchronousRequest(request1, queue: queue, completionHandler:{ (response: NSURLResponse?, data: NSData?, error: NSError?) -> Void in

        do {
            if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {
                print("ASynchronous\(jsonResult)")
            }
        } catch let error as NSError {
            print(error.localizedDescription)
        }


    })

6. Image(File) Upload

Swift 2.0 +

  let mainURL = "YOUR_URL_HERE"

    let url = NSURL(string: mainURL)
    let request = NSMutableURLRequest(URL: url!)
    let boundary = "78876565564454554547676"
    request.addValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")


    request.HTTPMethod = "POST" // POST OR PUT What you want
    let session = NSURLSession(configuration:NSURLSessionConfiguration.defaultSessionConfiguration(), delegate: nil, delegateQueue: nil)

    let imageData = UIImageJPEGRepresentation(UIImage(named: "Test.jpeg")!, 1)





    var body = NSMutableData()

    body.appendData("--\(boundary)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)

    // Append your parameters

    body.appendData("Content-Disposition: form-data; name=\"name\"\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
    body.appendData("PREMKUMAR\r\n".dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)!)
    body.appendData("--\(boundary)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)

    body.appendData("Content-Disposition: form-data; name=\"description\"\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
    body.appendData("IOS_DEVELOPER\r\n".dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)!)
    body.appendData("--\(boundary)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)


    // Append your Image/File Data

    var imageNameval = "HELLO.jpg"

    body.appendData("--\(boundary)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
    body.appendData("Content-Disposition: form-data; name=\"profile_photo\"; filename=\"\(imageNameval)\"\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
    body.appendData("Content-Type: image/jpeg\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
    body.appendData(imageData!)
    body.appendData("\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)

    body.appendData("--\(boundary)--\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)

    request.HTTPBody = body




    let dataTask = session.dataTaskWithRequest(request) { (data, response, error) -> Void in

        if error != nil {

            //handle error


        }
        else {




            let outputString : NSString = NSString(data:data!, encoding:NSUTF8StringEncoding)!
            print("Response:\(outputString)")


        }
    }
    dataTask.resume()

7. GET,POST,Etc Swift 3.0 +

let request = NSMutableURLRequest(url: URL(string: "YOUR_URL_HERE" ,param: param))!,
    cachePolicy: .useProtocolCachePolicy,
    timeoutInterval:60)
request.httpMethod = "POST" // POST ,GET, PUT What you want 

let session = URLSession.shared



  let dataTask = session.dataTask(with: request as URLRequest) {data,response,error in

do {
            if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {
                print("ASynchronous\(jsonResult)")
            }
        } catch let error as NSError {
            print(error.localizedDescription)
        }

    }
    dataTask.resume()

Notify ObservableCollection when Item changes

All the solutions here are correct,but they are missing an important scenario in which the method Clear() is used, which doesn't provide OldItems in the NotifyCollectionChangedEventArgs object.

this is the perfect ObservableCollection .

public delegate void ListedItemPropertyChangedEventHandler(IList SourceList, object Item, PropertyChangedEventArgs e);
public class ObservableCollectionEX<T> : ObservableCollection<T>
{
    #region Constructors
    public ObservableCollectionEX() : base()
    {
        CollectionChanged += ObservableCollection_CollectionChanged;
    }
    public ObservableCollectionEX(IEnumerable<T> c) : base(c)
    {
        CollectionChanged += ObservableCollection_CollectionChanged;
    }
    public ObservableCollectionEX(List<T> l) : base(l)
    {
        CollectionChanged += ObservableCollection_CollectionChanged;
    }

    #endregion



    public new void Clear()
    {
        foreach (var item in this)            
            if (item is INotifyPropertyChanged i)                
                i.PropertyChanged -= Element_PropertyChanged;            
        base.Clear();
    }
    private void ObservableCollection_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
    {
        if (e.OldItems != null)
            foreach (var item in e.OldItems)                
                if (item != null && item is INotifyPropertyChanged i)                    
                    i.PropertyChanged -= Element_PropertyChanged;


        if (e.NewItems != null)
            foreach (var item in e.NewItems)                
                if (item != null && item is INotifyPropertyChanged i)
                {
                    i.PropertyChanged -= Element_PropertyChanged;
                    i.PropertyChanged += Element_PropertyChanged;
                }
            }
    }
    private void Element_PropertyChanged(object sender, PropertyChangedEventArgs e) => ItemPropertyChanged?.Invoke(this, sender, e);


    public ListedItemPropertyChangedEventHandler ItemPropertyChanged;

}

Application not picking up .css file (flask/python)

In jinja2 templates (which flask uses), use

href="{{ url_for('static', filename='mainpage.css')}}"

The static files are usually in the static folder, though, unless configured otherwise.

How can I delete one element from an array by value

I improved Niels's solution

class Array          
  def except(*values)
    self - values
  end    
end

Now you can use

[1, 2, 3, 4].except(3, 4) # return [1, 2]
[1, 2, 3, 4].except(4)    # return [1, 2, 3]

Powershell 2 copy-item which creates a folder if doesn't exist

In PowerShell 3 and above I use the Copy-Item with New-Item.

copy-item -Path $file -Destination (new-item -type directory -force ("C:\Folder\sub\sub\" + $newSub)) -force -ea 0

I haven't tried it in ver 2.

Adding a column to an existing table in a Rails migration

You can also force to table columns in table using force: true, if you table is already exist.

example:

ActiveRecord::Schema.define(version: 20080906171750) do
  create_table "authors", force: true do |t|
    t.string   "name"
    t.datetime "created_at"
    t.datetime "updated_at"
  end
end

How to get the user input in Java?

Here is your program from the question using java.util.Scanner:

import java.util.Scanner;

public class Example {
    public static void main(String[] args) {
        int input = 0;
        System.out.println("The super insano calculator");
        System.out.println("enter the corrosponding number:");
        Scanner reader3 = new Scanner(System.in);
        System.out.println(
            "1. Add | 2. Subtract | 3. Divide | 4. Multiply");

        input = reader3.nextInt();

        int a = 0, b = 0;

        Scanner reader = new Scanner(System.in);
        System.out.println("Enter the first number");
        // get user input for a
        a = reader.nextInt();

        Scanner reader1 = new Scanner(System.in);
        System.out.println("Enter the scend number");
        // get user input for b
        b = reader1.nextInt();

        switch (input){
            case 1:  System.out.println(a + " + " + b + " = " + add(a, b));
                     break;
            case 2:  System.out.println(a + " - " + b + " = " + subtract(a, b));
                     break;
            case 3:  System.out.println(a + " / " + b + " = " + divide(a, b));
                     break;
            case 4:  System.out.println(a + " * " + b + " = " + multiply(a, b));
                     break;
            default: System.out.println("your input is invalid!");
                     break;
        }
    }

    static int      add(int lhs, int rhs) { return lhs + rhs; }
    static int subtract(int lhs, int rhs) { return lhs - rhs; }
    static int   divide(int lhs, int rhs) { return lhs / rhs; }
    static int multiply(int lhs, int rhs) { return lhs * rhs; }
}

XPath using starts-with function

Use:

/*/ITEM[starts-with(REVENUE_YEAR,'2552')]/REGION

Note: Unless your host language can't handle element instance as result, do not use text nodes specially in mixed content data model. Do not start expressions with // operator when the schema is well known.

MySQL - Operand should contain 1 column(s)

This error can also occur if you accidentally miss if function name.

for example:

set v_filter_value = 100;

select
    f_id,
    f_sale_value
from
    t_seller
where
    f_id = 5
    and (v_filter_value <> 0, f_sale_value = v_filter_value, true);

Got this problem when I missed putting if in the if function!

How can I render HTML from another file in a React component?

You can use dangerouslySetInnerHTML to do this:

import React from 'react';
function iframe() {
    return {
        __html: '<iframe src="./Folder/File.html" width="540" height="450"></iframe>'
    }
}


export default function Exercises() {
    return (
        <div>
            <div dangerouslySetInnerHTML={iframe()} />
        </div>)
}

HTML files must be in the public folder

Unable to open a file with fopen()

How are you running the file? Is it from the command line or from an IDE? The directory that your executable is in is not necessarily your working directory.

Try using the full path name in the fopen and see if that fixes it. If so, then the problem is as described.

For example:

file = fopen("c:\\MyDirectory\\TestFile1.txt", "r");
file = fopen("/full/path/to/TestFile1.txt", "r");

Or open up a command window and navigate to the directory where your executable is, then run it manually.

As an aside, you can insert a simple (for Windows or Linux/UNIX/BSD/etc respectively):

system ("cd")
system("pwd")

before the fopen to show which directory you're actually in.

Storing Python dictionaries

Pickle save:

try:
    import cPickle as pickle
except ImportError:  # Python 3.x
    import pickle

with open('data.p', 'wb') as fp:
    pickle.dump(data, fp, protocol=pickle.HIGHEST_PROTOCOL)

See the pickle module documentation for additional information regarding the protocol argument.

Pickle load:

with open('data.p', 'rb') as fp:
    data = pickle.load(fp)

JSON save:

import json

with open('data.json', 'w') as fp:
    json.dump(data, fp)

Supply extra arguments, like sort_keys or indent, to get a pretty result. The argument sort_keys will sort the keys alphabetically and indent will indent your data structure with indent=N spaces.

json.dump(data, fp, sort_keys=True, indent=4)

JSON load:

with open('data.json', 'r') as fp:
    data = json.load(fp)

How to copy data to clipboard in C#

Clipboard.SetText("hello");

You'll need to use the System.Windows.Forms or System.Windows namespaces for that.

Make Vim show ALL white spaces as a character

Adding this to my .vimrc works for me. Just make sure you don't have anything else conflicting..

autocmd VimEnter * :syn match space /\s/
autocmd VimEnter * :hi space ctermbg=lightgray ctermfg=black guibg=lightgray guifg=black

How to read a line from a text file in c/c++?

In c, you could use fopen, and getch. Usually, if you can't be exactly sure of the length of the longest line, you could allocate a large buffer (e.g. 8kb) and almost be guaranteed of getting all lines.

If there's a chance you may have really really long lines and you have to process line by line, you could malloc a resonable buffer, and use realloc to double it's size each time you get close to filling it.

#include <stdio.h>
#include <stdlib.h>

void handle_line(char *line) {
  printf("%s", line);
}

int main(int argc, char *argv[]) {
    int size = 1024, pos;
    int c;
    char *buffer = (char *)malloc(size);

    FILE *f = fopen("myfile.txt", "r");
    if(f) {
      do { // read all lines in file
        pos = 0;
        do{ // read one line
          c = fgetc(f);
          if(c != EOF) buffer[pos++] = (char)c;
          if(pos >= size - 1) { // increase buffer length - leave room for 0
            size *=2;
            buffer = (char*)realloc(buffer, size);
          }
        }while(c != EOF && c != '\n');
        buffer[pos] = 0;
        // line is now in buffer
        handle_line(buffer);
      } while(c != EOF); 
      fclose(f);           
    }
    free(buffer);
    return 0;
}

How to change proxy settings in Android (especially in Chrome)

Found one solution for WIFI (works for Android 4.3, 4.4):

Connect to WIFI network (e.g. 'Alex')
Settings->WIFI
Long tap on connected network's name (e.g. on 'Alex')
Modify network config-> Show advanced options
Set proxy settings

How to show all shared libraries used by executables in Linux?

With ldd you can get the libraries that tools use. To rank the usage of libraries for a set of tool you can use something like the following command.

ldd /bin/* /usr/bin/* ... | sed -e '/^[^\t]/ d; s/^\t\(.* => \)\?\([^ ]*\) (.*/\2/g' | sort | uniq -c

(Here sed strips all lines that do not start with a tab and the filters out only the actual libraries. With sort | uniq -c you get each library with a count indicating the number of times it occurred.)

You might want to add sort -g at the end to get the libraries in order of usage.

Note that you probably get lines two non-library lines with the above command. One of static executables ("not a dynamic executable") and one without any library. The latter is the result of linux-gate.so.1 which is not a library in your file system but one "supplied" by the kernel.

Conditional formatting, entire row based

You want to apply a custom formatting rule. The "Applies to" field should be your entire row (If you want to format row 5, put in =$5:$5. The custom formula should be =IF($B$5="X", TRUE, FALSE), shown in the example below.

cannot make a static reference to the non-static field

The static calls to withdraw and deposit are your problem. account.withdraw(balance, 2500); This line can't work , since "balance" is an instance variable of Account. The code doesn't make much sense anyway, wouldn't withdraw/deposit be encapsulated inside the Account object itself? so the withdraw should be more like

public void withdraw(double withdrawAmount)
{
    balance -= withdrawAmount;
}

Of course depending on your problem you could do additional validation here to prevent negative balance etc.

Safely turning a JSON string into an object

You also can use reviver function to filter.

var data = JSON.parse(jsonString, function reviver(key, value) {
   //your code here to filter
});

For more information read JSON.parse.

Maven error in eclipse (pom.xml) : Failure to transfer org.apache.maven.plugins:maven-surefire-plugin:pom:2.12.4

If you are using Eclipse Neon, try this:

1) Add the maven plugin in the properties section of the POM:

<properties>
    <java.version>1.8</java.version>
    <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
</properties>

2) Force update of project snapshot by right clicking on Project

Maven -> Update Project -> Select your Project -> Tick on the 'Force Update of Snapshots/Releases' option -> OK

PHP using Gettext inside <<<EOF string

As far as I can see in the manual, it is not possible to call functions inside HEREDOC strings. A cumbersome way would be to prepare the words beforehand:

<?php

    $world = _("World");

    $str = <<<EOF
    <p>Hello</p>
    <p>$world</p>
EOF;
    echo $str;
?>

a workaround idea that comes to mind is building a class with a magic getter method.

You would declare a class like this:

class Translator
{
 public function __get($name) {
  return _($name); // Does the gettext lookup
  }
 }

Initialize an object of the class at some point:

  $translate = new Translator();

You can then use the following syntax to do a gettext lookup inside a HEREDOC block:

    $str = <<<EOF
    <p>Hello</p>
    <p>{$translate->World}</p>
EOF;
    echo $str;
?>

$translate->World will automatically be translated to the gettext lookup thanks to the magic getter method.

To use this method for words with spaces or special characters (e.g. a gettext entry named Hello World!!!!!!, you will have to use the following notation:

 $translate->{"Hello World!!!!!!"}

This is all untested but should work.

Update: As @mario found out, it is possible to call functions from HEREDOC strings after all. I think using getters like this is a sleek solution, but using a direct function call may be easier. See the comments on how to do this.

Convert INT to FLOAT in SQL

In oracle db there is a trick for casting int to float (I suppose, it should also work in mysql):

select myintfield + 0.0 as myfloatfield from mytable

While @Heximal's answer works, I don't personally recommend it.

This is because it uses implicit casting. Although you didn't type CAST, either the SUM() or the 0.0 need to be cast to be the same data-types, before the + can happen. In this case the order of precedence is in your favour, and you get a float on both sides, and a float as a result of the +. But SUM(aFloatField) + 0 does not yield an INT, because the 0 is being implicitly cast to a FLOAT.

I find that in most programming cases, it is much preferable to be explicit. Don't leave things to chance, confusion, or interpretation.

If you want to be explicit, I would use the following.

CAST(SUM(sl.parts) AS FLOAT) * cp.price
-- using MySQL CAST FLOAT  requires 8.0

I won't discuss whether NUMERIC or FLOAT *(fixed point, instead of floating point)* is more appropriate, when it comes to rounding errors, etc. I'll just let you google that if you need to, but FLOAT is so massively misused that there is a lot to read about the subject already out there.

You can try the following to see what happens...

CAST(SUM(sl.parts) AS NUMERIC(10,4)) * CAST(cp.price AS NUMERIC(10,4))

Text was truncated or one or more characters had no match in the target code page including the primary key in an unpivot

None of the above worked for me. I SOLVED my problem by saving my source data (save as) Excel file as a single xls Worksheet Excel 5.0/95 and imported without column headings. Also, I created the table in advance and mapped manually instead of letting SQL create the table.

RegExp in TypeScript

_x000D_

const regex = /myRegexp/

console.log('Hello myRegexp!'.replace(regex, 'World')) // = Hello World!

_x000D_

The Regex literal notation is commonly used to create new instances of RegExp

     regex needs no additional escaping
      v
/    regex   /   gm
^            ^   ^
start      end   optional modifiers

As others sugguested, you can also use the new RegExp('myRegex') constructor.
But you will have to be especially careful with escaping:

regex: 12\d45
matches: 12345

const regex = new RegExp('12\\d45')
const equalRegex = /12\d45/

Removing ul indentation with CSS

This code will remove the indentation and list bullets.

ul {
    padding: 0;
    list-style-type: none;
}

http://jsfiddle.net/qeqtK/2/

Calculate difference in keys contained in two Python dictionaries

what about standart (compare FULL Object)

PyDev->new PyDev Module->Module: unittest

import unittest


class Test(unittest.TestCase):


    def testName(self):
        obj1 = {1:1, 2:2}
        obj2 = {1:1, 2:2}
        self.maxDiff = None # sometimes is usefull
        self.assertDictEqual(d1, d2)

if __name__ == "__main__":
    #import sys;sys.argv = ['', 'Test.testName']

    unittest.main()

Run local python script on remote server

I've had to do this before using Paramiko in a case where I wanted to run a dynamic, local PyQt4 script on a host running an ssh server that has connected my OpenVPN server and ask for their routing preference (split tunneling).

So long as the ssh server you are connecting to has all of the required dependencies of your script (PyQt4 in my case), you can easily encapsulate the data by encoding it in base64 and use the exec() built-in function on the decoded message. If I remember correctly my one-liner for this was:

stdout = client.exec_command('python -c "exec(\\"' + open('hello.py','r').read().encode('base64').strip('\n') + '\\".decode(\\"base64\\"))"' )[1]

It is hard to read and you have to escape the escape sequences because they are interpreted twice (once by the sender and then again by the receiver). It also may need some debugging, I've packed up my server to PCS or I'd just reference my OpenVPN routing script.

The difference in doing it this way as opposed to sending a file is that it never touches the disk on the server and is run straight from memory (unless of course they log the command). You'll find that encapsulating information this way (although inefficient) can help you package data into a single file.

For instance, you can use this method to include raw data from external dependencies (i.e. an image) in your main script.

How to format a Java string with leading zero?

String input = "Apple";
StringBuffer buf = new StringBuffer(input);

while (buf.length() < 8) {
  buf.insert(0, '0');
}

String output = buf.toString();

Push origin master error on new repository

I have this error too, i put a commit for not push empty project like a lot of people do but doesn't work

The problem was the ssl, y put the next

git config --system http.sslverify false

And after that everything works fine :)

git push origin master

Show Hide div if, if statement is true

Use show/hide method as below

$("div").show();//To Show

$("div").hide();//To Hide

Java Synchronized list

You can have 2 diffent problems with lists :
1) If you do a modification within an iteration even though in a mono thread environment, you will have ConcurrentModificationException like in this following example :

List<String> list = new ArrayList<String>();
for (int i=0;i<5;i++)
   list.add("Hello "+i);

for(String msg:list)
   list.remove(msg);

So, to avoid this problem, you can do :

for(int i=list.size()-1;i>=0;i--)
   list.remove(i);

2)The second problem could be multi threading environment. As mentioned above, you can use synchronized(list) to avoid exceptions.

Android - default value in editText

First you need to load the user details somehow

Then you need to find your EditText if you don't have it-

EditText et = (EditText)findViewById(R.id.youredittext);

after you've found your EditText, call

et.setText(theUserName);

What is the default Precision and Scale for a Number in Oracle?

I believe the default precision is 38, default scale is zero. However the actual size of an instance of this column, is dynamic. It will take as much space as needed to store the value, or max 21 bytes.

How to specify a multi-line shell variable?

simply insert new line where necessary

sql="
SELECT c1, c2
from Table1, Table2
where ...
"

shell will be looking for the closing quotation mark

How can I convert a std::string to int?

Admittedly, my solution wouldn't work for negative integers, but it will extract all positive integers from input text containing integers. It makes use of numeric_only locale:

int main() {
        int num;
        std::cin.imbue(std::locale(std::locale(), new numeric_only()));
        while ( std::cin >> num)
             std::cout << num << std::endl;
        return 0;
}

Input text:

 the format (-5) or (25) etc... some text.. and then.. 7987...78hjh.hhjg9878

Output integers:

The class numeric_only is defined as:

struct numeric_only: std::ctype<char> 
{
    numeric_only(): std::ctype<char>(get_table()) {}

    static std::ctype_base::mask const* get_table()
    {
        static std::vector<std::ctype_base::mask> 
            rc(std::ctype<char>::table_size,std::ctype_base::space);

        std::fill(&rc['0'], &rc[':'], std::ctype_base::digit);
        return &rc[0];
    }
};

Complete online demo : http://ideone.com/dRWSj

How to show Alert Message like "successfully Inserted" after inserting to DB using ASp.net MVC3

The 'best' way to do this would be to set a property on a view object once the update is successful. You can then access this property in the view and inform the user accordingly.

Having said that it would be possible to trigger an alert from the controller code by doing something like this -

public ActionResult ActionName(PostBackData postbackdata)
{
    //your DB code
    return new JavascriptResult { Script = "alert('Successfully registered');" };
}

You can find further info in this question - How to display "Message box" using MVC3 controller

:: (double colon) operator in Java 8

This is a method reference in Java 8. The oracle documentation is here.

As stated in the documentation...

The method reference Person::compareByAge is a reference to a static method.

The following is an example of a reference to an instance method of a particular object:

class ComparisonProvider {
    public int compareByName(Person a, Person b) {
        return a.getName().compareTo(b.getName());
    }

    public int compareByAge(Person a, Person b) {
        return a.getBirthday().compareTo(b.getBirthday());
    }
}

ComparisonProvider myComparisonProvider = new ComparisonProvider();
Arrays.sort(rosterAsArray, myComparisonProvider::compareByName);

The method reference myComparisonProvider::compareByName invokes the method compareByName that is part of the object myComparisonProvider. The JRE infers the method type arguments, which in this case are (Person, Person).

Font Awesome not working, icons showing as squares

I have changed from 3.2.1 to 4.0.1 and the folder was font and now is called fonts.

src: url('../font/fontawesome-webfont.eot?v=3.2.1');

src: url('../fonts/fontawesome-webfont.eot?v=4.0.1');

I hope it help someone.

SQL Server: Is it possible to insert into two tables at the same time?

You still need two INSERT statements, but it sounds like you want to get the IDENTITY from the first insert and use it in the second, in which case, you might want to look into OUTPUT or OUTPUT INTO: http://msdn.microsoft.com/en-us/library/ms177564.aspx

jQuery selector for id starts with specific text

If all your divs start with editDialog as you stated, then you can use the following selector:

$("div[id^='editDialog']")

Or you could use a class selector instead if it's easier for you

<div id="editDialog-0" class="editDialog">...</div>

$(".editDialog")

How to check that a JCheckBox is checked?

By using itemStateChanged(ItemListener) you can track selecting and deselecting checkbox (and do whatever you want based on it):

myCheckBox.addItemListener(new ItemListener() {
    @Override
    public void itemStateChanged(ItemEvent e) {
        if(e.getStateChange() == ItemEvent.SELECTED) {//checkbox has been selected
            //do something...
        } else {//checkbox has been deselected
            //do something...
        };
    }
});

Java Swing itemStateChanged docu should help too. By using isSelected() method you can just test if actual is checkbox selected:

if(myCheckBox.isSelected()){_do_something_if_selected_}

How to resolve cURL Error (7): couldn't connect to host?

In my case, the problem was caused by the hosting provider I was using blocking http packets addressed to their IP block that originated from within their IP block. Un-frickin-believable!!!

How to ignore whitespace in a regular expression subject string?

This approach can be used to automate this (the following exemplary solution is in python, although obviously it can be ported to any language):

you can strip the whitespace beforehand AND save the positions of non-whitespace characters so you can use them later to find out the matched string boundary positions in the original string like the following:

def regex_search_ignore_space(regex, string):
    no_spaces = ''
    char_positions = []

    for pos, char in enumerate(string):
        if re.match(r'\S', char):  # upper \S matches non-whitespace chars
            no_spaces += char
            char_positions.append(pos)

    match = re.search(regex, no_spaces)
    if not match:
        return match

    # match.start() and match.end() are indices of start and end
    # of the found string in the spaceless string
    # (as we have searched in it).
    start = char_positions[match.start()]  # in the original string
    end = char_positions[match.end()]  # in the original string
    matched_string = string[start:end]  # see

    # the match WITH spaces is returned.
    return matched_string

with_spaces = 'a li on and a cat'
print(regex_search_ignore_space('lion', with_spaces))
# prints 'li on'

If you want to go further you can construct the match object and return it instead, so the use of this helper will be more handy.

And the performance of this function can of course also be optimized, this example is just to show the path to a solution.

What size should TabBar images be?

According to the Apple Human Interface Guidelines:

@1x : about 25 x 25 (max: 48 x 32)

@2x : about 50 x 50 (max: 96 x 64)

@3x : about 75 x 75 (max: 144 x 96)

Downloading Java JDK on Linux via wget is shown license page instead

Oracle has put a prevention cookie on the download link to force you to agree to the terms even though the license agreement to use Java clearly states that merely by using Java you 'agree' to the license..

The method that Oracle wants is you to download it with an agreement. After that, this script cn be modified for your specific Linux

#!/bin/bash
#Author: Yucca Nel http://thejarbar.org
#Will restart system
#Modify these variables as needed...
tempWork=/tmp/work
locBin=/usr/local/bin
javaUsrLib=/usr/lib/jvm

sudo mkdir -p $javaUsrLib
mkdir -p $tempWork
cd $tempWork

#Extract the download
tar -zxvf $downloadDir/jdk*tar.gz

#Move it to where it can be found...

sudo mv -f $tempWork/jdk* $javaUsrLib/

sudo ln -f -s $javaUsrLib/jdk1/bin/* /usr/bin/

#Update this line to reflect versions of JDK...
export JAVA_HOME="$javaUsrLib/jdk1.7.0_03"
#Extract the download
tar -zxvf $tempWork/*

#Move it to where it can be found...

sudo mv -f $tempWork/jdk1* $javaUsrLib/

sudo ln -f -s $javaUsrLib/jdk1*/bin/* /usr/bin/
sudo rm -rf $tempWork
#Update this line to reflect newer versions of JDK...
export JAVA_HOME="$javaUsrLib/jdk1.7.0_03"

if ! grep "JAVA_HOME=$javaUsrLib/jdk1.7.0_03" /etc/environment
then
    echo "JAVA_HOME=$javaUsrLib/jdk1.7.0_03"| sudo tee -a /etc/environment
fi


exit 0

Add all files to a commit except a single file?

To keep the change in file but not to commit I did this

git add .

git reset -- main/dontcheckmein.txt

git commit -m "commit message"

to verify the file is excluded do

git status

How to upload a file to directory in S3 bucket using boto

I used this and it is very simple to implement

import tinys3

conn = tinys3.Connection('S3_ACCESS_KEY','S3_SECRET_KEY',tls=True)

f = open('some_file.zip','rb')
conn.upload('some_file.zip',f,'my_bucket')

https://www.smore.com/labs/tinys3/

How to convert Django Model object to dict with its fields and values?

just vars(obj) , it will state the whole values of the object

>>> obj_attrs = vars(obj)
>>> obj_attrs
 {'_file_data_cache': <FileData: Data>,
  '_state': <django.db.models.base.ModelState at 0x7f5c6733bad0>,
  'aggregator_id': 24,
  'amount': 5.0,
  'biller_id': 23,
  'datetime': datetime.datetime(2018, 1, 31, 18, 43, 58, 933277, tzinfo=<UTC>),
  'file_data_id': 797719,
 }

You can add this also

>>> keys = obj_attrs.keys()
>>> temp = [obj_attrs.pop(key) if key.startswith('_') else None for key in keys]
>>> del temp
>>> obj_attrs
   {
    'aggregator_id': 24,
    'amount': 5.0,
    'biller_id': 23,
    'datetime': datetime.datetime(2018, 1, 31, 18, 43, 58, 933277, tzinfo=<UTC>),
    'file_data_id': 797719,
   }

Simulate low network connectivity for Android

Very old post but I'll add my two cents. I have been VERY happy with this hardware product ( https://apposite-tech.com/products/linktropy-mini/ ) which has enabled us to simulate a lot of real-world conditions. For a long time we had challenges troubleshooting various things that would work in emulator or with airplane mode.

We have several different profiles setup from zero-connectivity to various stages of marginal connectivity, with different degrees of latency, packet loss, and bit-errors. The great thing about it is we can change these on the fly without having to relaunch the app in an emulator. The price has been entirely worth it for our shop, and it's dead simple to use.

Datatables - Search Box outside datatable

You can use the DataTables api to filter the table. So all you need is your own input field with a keyup event that triggers the filter function to DataTables. With css or jquery you can hide/remove the existing search input field. Or maybe DataTables has a setting to remove/not-include it.

Checkout the Datatables API documentation on this.

Example:

HTML

<input type="text" id="myInputTextField">

oTable = $('#myTable').DataTable();   //pay attention to capital D, which is mandatory to retrieve "api" datatables' object, as @Lionel said
$('#myInputTextField').keyup(function(){
      oTable.search($(this).val()).draw() ;
})

Failed to build gem native extension (installing Compass)

The best way is sudo apt-get install ruby-compass to install compass.

File URL "Not allowed to load local resource" in the Internet Browser

You just need to replace all image network paths to byte strings in HTML string. For this first you required HtmlAgilityPack to convert Html string to Html document. https://www.nuget.org/packages/HtmlAgilityPack

Find Below code to convert each image src network path(or local path) to byte sting. It will definitely display all images with network path(or local path) in IE,chrome and firefox.

string encodedHtmlString = Emailmodel.DtEmailFields.Rows[0]["Body"].ToString();

        // Decode the encoded string.
        StringWriter myWriter = new StringWriter();
        HttpUtility.HtmlDecode(encodedHtmlString, myWriter);
        string DecodedHtmlString = myWriter.ToString();

        //find and replace each img src with byte string
         HtmlDocument document = new HtmlDocument();
         document.LoadHtml(DecodedHtmlString);
         document.DocumentNode.Descendants("img")
          .Where(e =>
        {
            string src = e.GetAttributeValue("src", null) ?? "";
            return !string.IsNullOrEmpty(src);//&& src.StartsWith("data:image");
        })
        .ToList()
                    .ForEach(x =>
                    {
                        string currentSrcValue = x.GetAttributeValue("src", null);                                
                        string filePath = Path.GetDirectoryName(currentSrcValue) + "\\";
                        string filename = Path.GetFileName(currentSrcValue);
                        string contenttype = "image/" + Path.GetExtension(filename).Replace(".", "");
                        FileStream fs = new FileStream(filePath + filename, FileMode.Open, FileAccess.Read);
                        BinaryReader br = new BinaryReader(fs);
                        Byte[] bytes = br.ReadBytes((Int32)fs.Length);
                        br.Close();
                        fs.Close();
                        x.SetAttributeValue("src", "data:" + contenttype + ";base64," + Convert.ToBase64String(bytes));                                
                    });

        string result = document.DocumentNode.OuterHtml;
        //Encode HTML string
        string myEncodedString = HttpUtility.HtmlEncode(result);

        Emailmodel.DtEmailFields.Rows[0]["Body"] = myEncodedString;

CSS3 Transition not working

A general answer for a general question... Transitions can't animate properties that are auto. If you have a transition not working, check that the starting value of the property is explicitly set. (For example, to make a node collapse, when it's height is auto and must stay that way, put the transition on max-height instead. Give max-height a sensible initial value, then transition it to 0)

How do I return clean JSON from a WCF Service?

Change the return type of your GetResults to be List<Person>.
Eliminate the code that you use to serialize the List to a json string - WCF does this for you automatically.

Using your definition for the Person class, this code works for me:

public List<Person> GetPlayers()
{
    List<Person> players = new List<Person>();
    players.Add(new  Person { FirstName="Peyton", LastName="Manning", Age=35 } );
    players.Add(new  Person { FirstName="Drew", LastName="Brees", Age=31 } );
    players.Add(new  Person { FirstName="Brett", LastName="Favre", Age=58 } );

    return players;
}

results:

[{"Age":35,"FirstName":"Peyton","LastName":"Manning"},  
 {"Age":31,"FirstName":"Drew","LastName":"Brees"},  
 {"Age":58,"FirstName":"Brett","LastName":"Favre"}]

(All on one line)

I also used this attribute on the method:

[WebInvoke(Method = "GET",
           RequestFormat = WebMessageFormat.Json,
           ResponseFormat = WebMessageFormat.Json,
           UriTemplate = "players")]

WebInvoke with Method= "GET" is the same as WebGet, but since some of my methods are POST, I use all WebInvoke for consistency.

The UriTemplate sets the URL at which the method is available. So I can do a GET on http://myserver/myvdir/JsonService.svc/players and it just works.

Also check out IIRF or another URL rewriter to get rid of the .svc in the URI.

How I can get web page's content and save it into the string variable

I recommend not using WebClient.DownloadString. This is because (at least in .NET 3.5) DownloadString is not smart enough to use/remove the BOM, should it be present. This can result in the BOM (ï»¿) incorrectly appearing as part of the string when UTF-8 data is returned (at least without a charset) - ick!

Instead, this slight variation will work correctly with BOMs:

string ReadTextFromUrl(string url) {
    // WebClient is still convenient
    // Assume UTF8, but detect BOM - could also honor response charset I suppose
    using (var client = new WebClient())
    using (var stream = client.OpenRead(url))
    using (var textReader = new StreamReader(stream, Encoding.UTF8, true)) {
        return textReader.ReadToEnd();
    }
}

month name to month number and vice versa in python

One more:

def month_converter(month):
    months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    return months.index(month) + 1

'Missing contentDescription attribute on image' in XML

It is giving you the warning because the image description is not defined.

We can resolve this warning by adding this code below in Strings.xml and activity_main.xml

Add this line below in Strings.xml

<string name="imgDescription">Background Picture</string>
you image will be like that:
<ImageView
        android:id="@+id/imageView2"
        android:lay`enter code hereout_width="0dp"
        android:layout_height="wrap_content"
        android:contentDescription="@string/imgDescription"
        app:layout_editor_absoluteX="0dp"
        app:layout_editor_absoluteY="0dp"
        app:srcCompat="@drawable/background1"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_editor_absoluteY="0dp" />

Also add this line in activity_main.xml

android:contentDescription="@string/imgDescription"

Strings.xml

<resources>
    <string name="app_name">Saini_Browser</string>
    <string name="SainiBrowser">textView2</string>
    <string name="imgDescription">BackGround Picture</string>
</resources>

How can I save a base64-encoded image to disk?

I also had to save Base64 encoded images that are part of data URLs, so I ended up making a small npm module to do it in case I (or someone else) needed to do it again in the future. It's called ba64.

Simply put, it takes a data URL with a Base64 encoded image and saves the image to your file system. It can save synchronously or asynchronously. It also has two helper functions, one to get the file extension of the image, and the other to separate the Base64 encoding from the data: scheme prefix.

Here's an example:

var ba64 = require("ba64"),
    data_url = "data:image/jpeg;base64,[Base64 encoded image goes here]";

// Save the image synchronously.
ba64.writeImageSync("myimage", data_url); // Saves myimage.jpeg.

// Or save the image asynchronously.
ba64.writeImage("myimage", data_url, function(err){
    if (err) throw err;

    console.log("Image saved successfully");

    // do stuff
});

Install it: npm i ba64 -S. Repo is on GitHub: https://github.com/HarryStevens/ba64.

P.S. It occurred to me later that ba64 is probably a bad name for the module since people may assume it does Base64 encoding and decoding, which it doesn't (there are lots of modules that already do that). Oh well.

Systrace for Windows

API Monitor looks very useful for this purpose.

How to manually force a commit in a @Transactional method?

Why don't you use spring's TransactionTemplate to programmatically control transactions? You could also restructure your code so that each "transaction block" has it's own @Transactional method, but given that it's a test I would opt for programmatic control of your transactions.

Also note that the @Transactional annotation on your runnable won't work (unless you are using aspectj) as the runnables aren't managed by spring!

@RunWith(SpringJUnit4ClassRunner.class)
//other spring-test annotations; as your database context is dirty due to the committed transaction you might want to consider using @DirtiesContext
public class TransactionTemplateTest {

@Autowired
PlatformTransactionManager platformTransactionManager;

TransactionTemplate transactionTemplate;

@Before
public void setUp() throws Exception {
    transactionTemplate = new TransactionTemplate(platformTransactionManager);
}

@Test //note that there is no @Transactional configured for the method
public void test() throws InterruptedException {

    final Contract c1 = transactionTemplate.execute(new TransactionCallback<Contract>() {
        @Override
        public Contract doInTransaction(TransactionStatus status) {
            Contract c = contractDOD.getNewTransientContract(15);
            contractRepository.save(c);
            return c;
        }
    });

    ExecutorService executorService = Executors.newFixedThreadPool(5);

    for (int i = 0; i < 5; ++i) {
        executorService.execute(new Runnable() {
            @Override  //note that there is no @Transactional configured for the method
            public void run() {
                transactionTemplate.execute(new TransactionCallback<Object>() {
                    @Override
                    public Object doInTransaction(TransactionStatus status) {
                        // do whatever you want to do with c1
                        return null;
                    }
                });
            }
        });
    }

    executorService.shutdown();
    executorService.awaitTermination(10, TimeUnit.SECONDS);

    transactionTemplate.execute(new TransactionCallback<Object>() {
        @Override
        public Object doInTransaction(TransactionStatus status) {
            // validate test results in transaction
            return null;
        }
    });
}

}

Format datetime in asp.net mvc 4

Thanks Darin, For me, to be able to post to the create method, It only worked after I modified the BindModel code to :

public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
    var displayFormat = bindingContext.ModelMetadata.DisplayFormatString;
    var value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);

    if (!string.IsNullOrEmpty(displayFormat) && value != null)
    {
        DateTime date;
        displayFormat = displayFormat.Replace("{0:", string.Empty).Replace("}", string.Empty);
        // use the format specified in the DisplayFormat attribute to parse the date
         if (DateTime.TryParse(value.AttemptedValue, CultureInfo.GetCultureInfo("en-GB"), DateTimeStyles.None, out date))
        {
            return date;
        }
        else
        {
            bindingContext.ModelState.AddModelError(
                bindingContext.ModelName,
                string.Format("{0} is an invalid date format", value.AttemptedValue)
            );
        }
    }

    return base.BindModel(controllerContext, bindingContext);
}

Hope this could help someone else...

Deserialize Java 8 LocalDateTime with JacksonMapper

The date time you're passing is not a iso local date time format.

Change to

@Column(name = "start_date")
@DateTimeFormat(iso = DateTimeFormatter.ISO_LOCAL_DATE_TIME)
@JsonFormat(pattern = "YYYY-MM-dd HH:mm")
private LocalDateTime startDate;

and pass date string in the format '2011-12-03T10:15:30'.

But if you still want to pass your custom format, use just have to specify the right formatter.

Change to

@Column(name = "start_date")
@DateTimeFormat(iso = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm"))
@JsonFormat(pattern = "YYYY-MM-dd HH:mm")
private LocalDateTime startDate;

I think your problem is the @DateTimeFormat has no effect at all. As the jackson is doing the deseralization and it doesnt know anything about spring annotation and I dont see spring scanning this annotation in the deserialization context.

Alternatively, you can try setting the formatter while registering the java time module.

LocalDateTimeDeserializer localDateTimeDeserializer = new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm"));
module.addDeserializer(LocalDateTime.class, localDateTimeDeserializer);

Here is the test case with the deseralizer which works fine. May be try to get rid of that DateTimeFormat annotation altogether.

@RunWith(JUnit4.class)
public class JacksonLocalDateTimeTest {

    private ObjectMapper objectMapper;

    @Before
    public void init() {
        JavaTimeModule module = new JavaTimeModule();
        LocalDateTimeDeserializer localDateTimeDeserializer =  new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm"));
        module.addDeserializer(LocalDateTime.class, localDateTimeDeserializer);
        objectMapper = Jackson2ObjectMapperBuilder.json()
                .modules(module)
                .featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
                .build();
    }

    @Test
    public void test() throws IOException {
        final String json = "{ \"date\": \"2016-11-08 12:00\" }";
        final JsonType instance = objectMapper.readValue(json, JsonType.class);

        assertEquals(LocalDateTime.parse("2016-11-08 12:00",DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm") ), instance.getDate());
    }
}


class JsonType {
    private LocalDateTime date;

    public LocalDateTime getDate() {
        return date;
    }

    public void setDate(LocalDateTime date) {
        this.date = date;
    }
}

Capture iOS Simulator video for App Preview

You can record a portion of the screen with built-in screenshot utility:

Press Shift-Command-5 to show a control panel.
Select .
Select a portion of the screen you want to record. That would be the iPhone simulator.
Click to stop recording.
A thumbnail will appear at the bottom right corner of the screen. You can edit it before saving.

If you want to visualize mouse clicks, after step 1 select Options control and enable Show Mouse Clicks.

Type definition in object literal in TypeScript

I'm surprised that no-one's mentioned this but you could just create an interface called ObjectLiteral, that accepts key: value pairs of type string: any:

interface ObjectLiteral {
  [key: string]: any;
}

Then you'd use it, like this:

let data: ObjectLiteral = {
  hello: "world",
  goodbye: 1,
  // ...
};

An added bonus is that you can re-use this interface many times as you need, on as many objects you'd like.

Good luck.

Finding out current index in EACH loop (Ruby)

X.each_with_index do |item, index|
  puts "current_index: #{index}"
end

Does Python have a package/module management system?

Since no one has mentioned pipenv here, I would like to describe my views why everyone should use it for managing python packages.

As @ColonelPanic mentioned there are several issues with the Python Package Index and with pip and virtualenv also.

Pipenv solves most of the issues with pip and provides additional features also.

Pipenv features

Pipenv is intended to replace pip and virtualenv, which means pipenv will automatically create a separate virtual environment for every project thus avoiding conflicts between different python versions/package versions for different projects.

Enables truly deterministic builds, while easily specifying only what you want.
Generates and checks file hashes for locked dependencies.
Automatically install required Pythons, if pyenv is available.
Automatically finds your project home, recursively, by looking for a Pipfile.
Automatically generates a Pipfile, if one doesn’t exist.
Automatically creates a virtualenv in a standard location.
Automatically adds/removes packages to a Pipfile when they are un/installed.
Automatically loads .env files, if they exist.

If you have worked on python projects before, you would realize these features make managing packages way easier.

Other Commands

check checks for security vulnerabilities and asserts that PEP 508 requirements are being met by the current environment. (which I think is a great feature especially after this - Malicious packages on PyPi)
graph will show you a dependency graph, of your installed dependencies.

You can read more about it here - Pipenv.

Installation

You can find the installation documentation here

P.S.: If you liked working with the Python Package requests , you would be pleased to know that pipenv is by the same developer Kenneth Reitz

How to exclude particular class name in CSS selector?

Method 1

The problem with your code is that you are selecting the .remode_hover that is a descendant of .remode_selected. So the first part of getting your code to work correctly is by removing that space

.reMode_selected.reMode_hover:hover

Then, in order to get the style to not work, you have to override the style set by the :hover. In other words, you need to counter the background-color property. So the final code will be

.reMode_selected.reMode_hover:hover {
  background-color:inherit;
}
.reMode_hover:hover {
  background-color: #f0ac00;
}

Fiddle

Method 2

An alternative method would be to use :not(), as stated by others. This will return any element that doesn't have the class or property stated inside the parenthesis. In this case, you would put .remode_selected in there. This will target all elements that don't have a class of .remode_selected

Fiddle

However, I would not recommend this method, because of the fact that it was introduced in CSS3, so browser support is not ideal.

Method 3

A third method would be to use jQuery. You can target the .not() selector, which would be similar to using :not() in CSS, but with much better browser support

Fiddle

Create a zip file and download it

Add Content-length header describing size of zip file in bytes.

header("Content-type: application/zip"); 
header("Content-Disposition: attachment; filename=$archive_file_name");
header("Content-length: " . filesize($archive_file_name));
header("Pragma: no-cache"); 
header("Expires: 0"); 
readfile("$archive_file_name");

Also make sure that there is absolutely no white space before <? and after ?>. I see a space here:

 <?php
$file_names = array('iMUST Operating Manual V1.3a.pdf','iMUST Product Information Sheet.pdf');

ESLint - "window" is not defined. How to allow global variables in package.json

I'm aware he's not asking for the inline version. But since this question has almost 100k visits and I fell here looking for that, I'll leave it here for the next fellow coder:

Make sure ESLint is not run with the --no-inline-config flag (if this doesn't sound familiar, you're likely good to go). Then, write this in your code file (for clarity and convention, it's written on top of the file but it'll work anywhere):

/* eslint-env browser */

This tells ESLint that your working environment is a browser, so now it knows what things are available in a browser and adapts accordingly.

There are plenty of environments, and you can declare more than one at the same time, for example, in-line:

/* eslint-env browser, node */

If you are almost always using particular environments, it's best to set it in your ESLint's config file and forget about it.

From their docs:

An environment defines global variables that are predefined. The available environments are:

browser - browser global variables.

node - Node.js global variables and Node.js scoping.

commonjs - CommonJS global variables and CommonJS scoping (use this for browser-only code that uses Browserify/WebPack).

shared-node-browser - Globals common to both Node and Browser.

[...]

Besides environments, you can make it ignore anything you want. If it warns you about using console.log() but you don't want to be warned about it, just inline:

/* eslint-disable no-console */

You can see the list of all rules, including recommended rules to have for best coding practices.

Jquery function BEFORE form submission

$('#myform').submit(function() {
  // your code here
})

The above is NOT working in Firefox. The form will just simply submit without running your code first. Also, similar issues are mentioned elsewhere... such as this question. The workaround will be

$('#myform').submit(function(event) {

 event.preventDefault(); //this will prevent the default submit

  // your code here (But not asynchronous code such as Ajax because it does not wait for a response and move to the next line.)
  
 $(this).unbind('submit').submit(); // continue the submit unbind preventDefault
})

batch file - counting number of files in folder and storing in a variable

for /F "tokens=1" %a in ('dir ^| findstr "File(s)"') do echo %a

Result:

C:\MyDir> for /F "tokens=1" %a in ('dir ^| findstr "File(s)"') do @set FILE_COUNT=%a

C:\MyDir> echo %FILE_COUNT%
4   // <== There's your answer

MySQL root password change

On MySQL 8 you need to specify the password hashing method:

ALTER USER 'root'@'localhost' IDENTIFIED WITH caching_sha2_password BY 'new-password';

What is the parameter "next" used for in Express?

I also had problem understanding next() , but this helped

var app = require("express")();

app.get("/", function(httpRequest, httpResponse, next){
    httpResponse.write("Hello");
    next(); //remove this and see what happens 
});

app.get("/", function(httpRequest, httpResponse, next){
    httpResponse.write(" World !!!");
    httpResponse.end();
});

app.listen(8080);

get url content PHP

original answer moved to this topic .

Positioning background image, adding padding

To add space before background image, one could define the 'width' of element which is using 'background-image' object. And then to define a pixel value in 'background-position' property to create space from left side.

For example, I'd a scenario where I got a navigation menu which had a bullet before link item and the bullet graphic were changeable if corrosponding link turns into an active state. Further, the active link also had a background-color to show, and this background-color had approximate 15px padding both on left and right side of link item (so on left, it includes bullet icon of link too).

While padding-right fulfill the purpose to have background-color stretched upto 15px more on right of link text. The padding-left only added to space between link text and bullet.

So I took the width of background-color object from PSD design (for ex. 82px) and added that to li element (in a class created to show active state) and then I set background-position value to 20px. Which resulted in bullet icon shifted inside from the left edge. And its provided me desired output of having left padding before bullet icon used as background image.

Please note, you may need to adjust your padding / margin values accordingly, which may used either for space between link items or for spacing between bullet icon and link text.

Replace first occurrence of string in Python

Use re.sub directly, this allows you to specify a count:

regex.sub('', url, 1)

(Note that the order of arguments is replacement, original not the opposite, as might be suspected.)

How to format number of decimal places in wpf using style/template?

The accepted answer does not show 0 in integer place on giving input like 0.299. It shows .3 in WPF UI. So my suggestion to use following string format

<TextBox Text="{Binding Value,  StringFormat={}{0:#,0.0}}"

How can I alter a primary key constraint using SQL syntax?

In my case, I want to add a column to a Primary key (column4). I used this script to add column4

ALTER TABLE TableA
DROP CONSTRAINT [PK_TableA]

ALTER TABLE TableA
ADD CONSTRAINT [PK_TableA] PRIMARY KEY (
    [column1] ASC,
    [column2] ASC, 
    [column3] ASC,
    [column4] ASC
)

Using SSH keys inside docker container

This line is a problem:

ADD ../../home/ubuntu/.ssh/id_rsa /root/.ssh/id_rsa

When specifying the files you want to copy into the image you can only use relative paths - relative to the directory where your Dockerfile is. So you should instead use:

ADD id_rsa /root/.ssh/id_rsa

And put the id_rsa file into the same directory where your Dockerfile is.

Check this out for more details: http://docs.docker.io/reference/builder/#add

Apache POI Excel - how to configure columns to be expanded?

If you know the count of your columns (f.e. it's equal to a collection list). You can simply use this one liner to adjust all columns of one sheet (if you use at least java 8):

IntStream.range(0, columnCount).forEach((columnIndex) -> sheet.autoSizeColumn(columnIndex));

Why use prefixes on member variables in C++ classes

When reading through a member function, knowing who "owns" each variable is absolutely essential to understanding the meaning of the variable. In a function like this:

void Foo::bar( int apples )
{
    int bananas = apples + grapes;
    melons = grapes * bananas;
    spuds += melons;
}

...it's easy enough to see where apples and bananas are coming from, but what about grapes, melons, and spuds? Should we look in the global namespace? In the class declaration? Is the variable a member of this object or a member of this object's class? Without knowing the answer to these questions, you can't understand the code. And in a longer function, even the declarations of local variables like apples and bananas can get lost in the shuffle.

Prepending a consistent label for globals, member variables, and static member variables (perhaps g_, m_, and s_ respectively) instantly clarifies the situation.

void Foo::bar( int apples )
{
    int bananas = apples + g_grapes;
    m_melons = g_grapes * bananas;
    s_spuds += m_melons;
}

These may take some getting used to at first—but then, what in programming doesn't? There was a day when even { and } looked weird to you. And once you get used to them, they help you understand the code much more quickly.

(Using "this->" in place of m_ makes sense, but is even more long-winded and visually disruptive. I don't see it as a good alternative for marking up all uses of member variables.)

A possible objection to the above argument would be to extend the argument to types. It might also be true that knowing the type of a variable "is absolutely essential to understanding the meaning of the variable." If that is so, why not add a prefix to each variable name that identifies its type? With that logic, you end up with Hungarian notation. But many people find Hungarian notation laborious, ugly, and unhelpful.

void Foo::bar( int iApples )
{
    int iBananas = iApples + g_fGrapes;
    m_fMelons = g_fGrapes * iBananas;
    s_dSpuds += m_fMelons;
}

Hungarian does tell us something new about the code. We now understand that there are several implicit casts in the Foo::bar() function. The problem with the code now is that the value of the information added by Hungarian prefixes is small relative to the visual cost. The C++ type system includes many features to help types either work well together or to raise a compiler warning or error. The compiler helps us deal with types—we don't need notation to do so. We can infer easily enough that the variables in Foo::bar() are probably numeric, and if that's all we know, that's good enough for gaining a general understanding of the function. Therefore the value of knowing the precise type of each variable is relatively low. Yet the ugliness of a variable like "s_dSpuds" (or even just "dSpuds") is great. So, a cost-benefit analysis rejects Hungarian notation, whereas the benefit of g_, s_, and m_ overwhelms the cost in the eyes of many programmers.

How to correct TypeError: Unicode-objects must be encoded before hashing?

The error already says what you have to do. MD5 operates on bytes, so you have to encode Unicode string into bytes, e.g. with line.encode('utf-8').

How to center the elements in ConstraintLayout

There is a simpler way. If you set layout constraints as follows and your EditText is fixed sized, it will get centered in the constraint layout:

app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"

The left/right pair centers the view horizontally and top/bottom pair centers it vertically. This is because when you set the left, right or top,bottom constraints bigger than the view it self, the view gets centered between the two constraints i.e the bias is set to 50%. You can also move view up/down or right/left by setting the bias your self. Play with it a bit and you will see how it affects the views position.

Programs & Examples On #Class attributes

React Js conditionally applying class attributes

Above written as a function:

TempData keep() vs peek()

vertical align middle in <div>

How do I get the color from a hexadecimal color code using .NET?

Select multiple rows with the same value(s)

Linux: where are environment variables stored?

How do you split and unsplit a window/view in Eclipse IDE?

Pandas: change data type of Series to String

Curl command line for consuming webServices?

Calling JMX MBean method from a shell script

Multiple Inheritance in C#

set environment variable in python script

Installing PHP Zip Extension

Best database field type for a URL

add controls vertically instead of horizontally using flow layout

Handler vs AsyncTask vs Thread

Display encoded html with razor

What is the difference between 'java', 'javaw', and 'javaws'?

How to check Spark Version

How do I ZIP a file in C#, using no 3rd-party APIs?

How to simplify a null-safe compareTo() implementation?

Parsing JSON giving "unexpected token o" error

How can I set response header on express.js assets

MySQL combine two columns into one column

How to get IntPtr from byte[] in C#

Fixing broken UTF-8 encoding

Passing array in GET for a REST call

Delete directories recursively in Java

jQuery find() method not working in AngularJS directive

Javascript how to parse JSON array

Use :hover to modify the css of another class?

Passing an array as a function parameter in JavaScript

Load an image from a url into a PictureBox

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

Excel - Sum column if condition is met by checking other column in same table

Maximum value of maxRequestLength?

Java's L number (long) specification

Apply CSS to jQuery Dialog Buttons

Java ArrayList of Arrays?

What browsers support HTML5 WebSocket API?

Client side

Server side

How to add an element at the end of an array?

How to Copy Contents of One Canvas to Another Canvas Locally

Replacing few values in a pandas dataframe column with another value

How to add a .dll reference to a project in Visual Studio

How to specify the JDK version in android studio?

Java random number with given length

SQL Server : GROUP BY clause to get comma-separated values

SQLFiddle Demo

How can I trigger the click event of another element in ng-click using angularjs?

Determine the type of an object?

Difference between exit() and sys.exit() in Python

Pandas split DataFrame by column value

Postgres: How to convert a json string to text?

Best way to compare 2 XML documents in Java

Installing MySQL-python

pip install mysqlclient

Running Groovy script from the command line

Difference between Running and Starting a Docker container

CSS3 transitions inside jQuery .css()

How to Convert the value in DataTable into a string array in c#

How to comment out a block of code in Python

How to convert an Instant to a date format?

Function is not defined - uncaught referenceerror

Automatically set appsettings.json for dev and release environments in asp.net core?

Update for .NET Core 3.0+

How to set Environment Variables

How does Host.CreateDefaultBuilder work?

Further Reading - MS Docs

Angular 2 - NgFor using numbers instead collections

How to install ADB driver for any android device?

Error:java: invalid source release: 8 in Intellij. What does it mean?

Convert NVARCHAR to DATETIME in SQL Server 2008

pip: no module named _internal

How to create an XML document using XmlDocument?

Create boolean column in MySQL with false as default value?

Razor View Without Layout

How does `Host.CreateDefaultBuilder` work?