Pip error: Microsoft Visual C++ 14.0 is required

As an alternative to installing Visual C++, there is a way by installing an additional package in Conda (this option doesn't require admin rights). This worked for me:

conda install libpython m2w64-toolchain -c msys2

What is an example of the simplest possible Socket.io example?

index.html

<!doctype html>
<html>
  <head>
    <title>Socket.IO chat</title>
    <style>
      * { margin: 0; padding: 0; box-sizing: border-box; }
      body { font: 13px Helvetica, Arial; }
      form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; }
      form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }
      form button { width: 9%; background: rgb(130, 224, 255); border: none; padding: 10px; }
      #messages { list-style-type: none; margin: 0; padding: 0; }
      #messages li { padding: 5px 10px; }
      #messages li:nth-child(odd) { background: #eee; }
      #messages { margin-bottom: 40px }
    </style>
  </head>
  <body>
    <ul id="messages"></ul>
    <form action="">
      <input id="m" autocomplete="off" /><button>Send</button>
    </form>
    <script src="https://cdn.socket.io/socket.io-1.2.0.js"></script>
    <script src="https://code.jquery.com/jquery-1.11.1.js"></script>
    <script>
      $(function () {
        var socket = io();
        $('form').submit(function(){
          socket.emit('chat message', $('#m').val());
          $('#m').val('');
          return false;
        });
        socket.on('chat message', function(msg){
          $('#messages').append($('<li>').text(msg));
          window.scrollTo(0, document.body.scrollHeight);
        });
      });
    </script>
  </body>
</html>

index.js

var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
var port = process.env.PORT || 3000;

app.get('/', function(req, res){
  res.sendFile(__dirname + '/index.html');
});

io.on('connection', function(socket){
  socket.on('chat message', function(msg){
    io.emit('chat message', msg);
  });
});

http.listen(port, function(){
  console.log('listening on *:' + port);
});

And run these commands for run the application.

npm init;  // accept defaults
npm  install  socket.io  http  --save ;
node start

and open the URL:- http://127.0.0.1:3000/ Port may be different. and you will see this OUTPUT

Why AVD Manager options are not showing in Android Studio

It happens when there is no runnable module for Android App in your project. Creating new project definitely solves this.

You can check this using Run > Edit Configurations > Adding Android App. If there is not runnable Android App module then you can't see "AVD Manager" in the menu.

How can I check if a value is a json object?

Since it's just false and json object, why don't you check whether it's false, otherwise it must be json.

if(ret == false || ret == "false") {
    // json
}

Filter Pyspark dataframe column with None value

If you want to filter out records having None value in column then see below example:

df=spark.createDataFrame([[123,"abc"],[234,"fre"],[345,None]],["a","b"])

Now filter out null value records:

df=df.filter(df.b.isNotNull())

df.show()

If you want to remove those records from DF then see below:

df1=df.na.drop(subset=['b'])

df1.show()

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

In my case the problem was that both port 80 and 443 were in use: Steps to use to fix it are :

Open xampp and click on config button
Now click on ( Appache )httpd.conf (Open in notepad or other editor)
Now click ctrl + h.
Find 80 and replace with 8080
Now save and now click on Appache(httpd-ssl.conf).
Now find 443 and replace with 4430.
Now your xampp must be working fine as both these code are never in use by other programs on your system.

Now your localhost will be available as localhost:8080

Tensorflow image reading & display

(Can't comment, not enough reputation, but here is a modified version that worked for me)

To @HamedMP error about the No default session is registered you can use InteractiveSession to get rid of this error: https://www.tensorflow.org/versions/r0.8/api_docs/python/client.html#InteractiveSession

And to @NumesSanguis issue with Image.show, you can use the regular PIL .show() method because fromarray returns an image object.

I do both below (note I'm using JPEG instead of PNG):

import tensorflow as tf
import numpy as np
from PIL import Image

filename_queue = tf.train.string_input_producer(['my_img.jpg']) #  list of files to read

reader = tf.WholeFileReader()
key, value = reader.read(filename_queue)

my_img = tf.image.decode_jpeg(value) # use png or jpg decoder based on your files.

init_op = tf.initialize_all_variables()
sess = tf.InteractiveSession()
with sess.as_default():
    sess.run(init_op)

# Start populating the filename queue.

coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(coord=coord)

for i in range(1): #length of your filename list
  image = my_img.eval() #here is your image Tensor :) 

Image.fromarray(np.asarray(image)).show()

coord.request_stop()
coord.join(threads)

PHP split alternative?

If you want to split a string into words, you can use explode() or str_word_count().

C# equivalent to Java's charAt()?

string sample = "ratty";
Console.WriteLine(sample[0]);

And

Console.WriteLine(sample.Chars(0));
Reference: http://msdn.microsoft.com/en-us/library/system.string.chars%28v=VS.71%29.aspx

The above is same as using indexers in c#.

Change table header color using bootstrap

there's a bootstrap function to change the color of table header called thead-dark for dark background of table header and thead-light for light background of table header. Your code will look like this after using this function.

<table class="table">
    <tr class="thead-danger">
        <!-- here I used dark table headre -->
        <th>
            @Html.DisplayNameFor(model => model.name)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.checkBox1)
        </th>
        <th></th>
    </tr>

Add list to set?

Use set.update() or |=

>>> a = set('abc')
>>> l = ['d', 'e']
>>> a.update(l)
>>> a
{'e', 'b', 'c', 'd', 'a'}

>>> l = ['f', 'g']
>>> a |= set(l)
>>> a
{'e', 'b', 'f', 'c', 'd', 'g', 'a'}

edit: If you want to add the list itself and not its members, then you must use a tuple, unfortunately. Set members must be hashable.

How to use filesaver.js

wll it looks like I found the answer, although I havent tested it yet

var blob = new Blob(["Hello, world!"], {type: "text/plain;charset=utf-8"});
saveAs(blob, "hello world.txt");

from this page https://github.com/eligrey/FileSaver.js

How can I remove the last character of a string in python?

To remove the last character, just use a slice: my_file_path[:-1]. If you only want to remove a specific set of characters, use my_file_path.rstrip('/'). If you see the string as a file path, the operation is os.path.dirname. If the path is in fact a filename, I rather wonder where the extra slash came from in the first place.

Is there anyway to exclude artifacts inherited from a parent POM?

Best bet is to make the dependencies you don't always want to inherit intransitive.

You can do this by marking them in the parent pom with scope provided.

If you still want the parent to manage versions of these deps, you can use the <dependencyManagement> tag to setup the versions you want without explicitly inheriting them, or passing that inheritance along to children.

Trying to add adb to PATH variable OSX

I added export PATH=${PATH}:/Users/mishrapranjal/android-sdks/platform-tools/ into both places .bash_profile and .profile to make sure it works. Still it wasn't working and then I looked at sarnold's tip about restarting terminal and it worked like a charm. It saved my time of adding every time this into the PATH whenever I had to run adb. Thank you guys.

How to generate a random alpha-numeric string

An alternative in Java 8 is:

static final Random random = new Random(); // Or SecureRandom
static final int startChar = (int) '!';
static final int endChar = (int) '~';

static String randomString(final int maxLength) {
  final int length = random.nextInt(maxLength + 1);
  return random.ints(length, startChar, endChar + 1)
        .collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
        .toString();
}

Convert pandas DataFrame into list of lists

There is a built in method which would be the fastest method also, calling tolist on the .values np array:

df.values.tolist()

[[0.0, 3.61, 380.0, 3.0],
 [1.0, 3.67, 660.0, 3.0],
 [1.0, 3.19, 640.0, 4.0],
 [0.0, 2.93, 520.0, 4.0]]

How can I generate an MD5 hash?

 import java.math.BigInteger;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;

/**
* MD5 encryption
*
* @author Hongten
*
*/
public class MD5 {

 public static void main(String[] args) {
     System.out.println(MD5.getMD5("123456"));
 }

 /**
  * Use md5 encoded code value
  *
  * @param sInput
  * clearly
  * @ return md5 encrypted password
  */
 public static String getMD5(String sInput) {

     String algorithm = "";
     if (sInput == null) {
         return "null";
     }
     try {
         algorithm = System.getProperty("MD5.algorithm", "MD5");
     } catch (SecurityException se) {
     }
     MessageDigest md = null;
     try {
         md = MessageDigest.getInstance(algorithm);
     } catch (NoSuchAlgorithmException e) {
         e.printStackTrace();
     }
     byte buffer[] = sInput.getBytes();

     for (int count = 0; count < sInput.length(); count++) {
         md.update(buffer, 0, count);
     }
     byte bDigest[] = md.digest();
     BigInteger bi = new BigInteger(bDigest);
     return (bi.toString(16));
 }
}

There is an article on Codingkit about that. Check out: http://codingkit.com/a/JAVA/2013/1020/2216.html

In Visual Studio Code How do I merge between two local branches?

You can do it without using plugins.

In the latest version of vscode that I'm using (1.17.0) you can simply open the branch that you want (from the bottom left menu) then press ctrl+shift+p and type Git: Merge branch and then choose the other branch that you want to merge from (to the current one)

jQuery - Detect value change on hidden input field

You can simply use the below function, You can also change the type element.

 $("input[type=hidden]").bind("change", function() {
       alert($(this).val()); 
 });

Changes in value to hidden elements don't automatically fire the .change() event. So, wherever it is that you're setting that value, you also have to tell jQuery to trigger it.

HTML

 <div id="message"></div>
<input type="hidden" id="testChange" value="0"  />

JAVASCRIPT

var $message = $('#message');
var $testChange = $('#testChange');
var i = 1;

function updateChange() {
    $message.html($message.html() + '<p>Changed to ' + $testChange.val() + '</p>');
}

$testChange.on('change', updateChange);

setInterval(function() {
    $testChange.val(++i).trigger('change');; 
    console.log("value changed" +$testChange.val());
}, 3000);

updateChange();

should work as expected.

http://jsfiddle.net/7CM6k/3/

How to set some xlim and ylim in Seaborn lmplot facetgrid

The lmplot function returns a FacetGrid instance. This object has a method called set, to which you can pass key=value pairs and they will be set on each Axes object in the grid.

Secondly, you can set only one side of an Axes limit in matplotlib by passing None for the value you want to remain as the default.

Putting these together, we have:

g = sns.lmplot('X', 'Y', df, col='Z', sharex=False, sharey=False)
g.set(ylim=(0, None))

enter image description here

Alarm Manager Example

I have made my own implementation to do this on the simplest way as possible.

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;

import junit.framework.Assert;

/**
 * Created by Daniel on 28/08/2016.
 */
public abstract class AbstractSystemServiceTask {

    private final Context context;
    private final AlarmManager alarmManager;
    private final BroadcastReceiver broadcastReceiver;
    private final PendingIntent pendingIntent;

    public AbstractSystemServiceTask(final Context context, final String id, final long time, final AlarmType alarmType, final BackgroundTaskListener backgroundTaskListener) {

        Assert.assertNotNull("ApplicationContext can't be null", context);
        Assert.assertNotNull("ID can't be null", id);

        this.context = context;

        this.alarmManager = (AlarmManager) this.context.getSystemService(Context.ALARM_SERVICE);

        this.context.registerReceiver(
                this.broadcastReceiver = this.getBroadcastReceiver(backgroundTaskListener),
                new IntentFilter(id));

        this.configAlarmManager(
                this.pendingIntent = PendingIntent.getBroadcast(this.context, 0, new Intent(id), 0),
                time,
                alarmType);
    }

    public void stop() {

        this.alarmManager.cancel(this.pendingIntent);
        this.context.unregisterReceiver(this.broadcastReceiver);
    }

    private BroadcastReceiver getBroadcastReceiver(final BackgroundTaskListener backgroundTaskListener) {

        Assert.assertNotNull("BackgroundTaskListener can't be null.", backgroundTaskListener);

        return new BroadcastReceiver() {

            @Override
            public void onReceive(Context context, Intent intent) {

                backgroundTaskListener.perform(context, intent);
            }
        };
    }

    private void configAlarmManager(final PendingIntent pendingIntent, final long time, final AlarmType alarmType) {

        long ensurePositiveTime = Math.max(time, 0L);

        switch (alarmType) {
            case REPEAT:
                this.alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), ensurePositiveTime, pendingIntent);
                break;
            case ONE_TIME:
            default:
                this.alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + ensurePositiveTime, pendingIntent);
        }
    }

    public interface BackgroundTaskListener {

        void perform(Context context, Intent intent);

    }

    public enum AlarmType {

        REPEAT, ONE_TIME;

    }

}

The only next step, implement it.

import android.content.Context;
import android.content.Intent;
import android.util.Log;

import ...AbstractSystemServiceTask;

import java.util.concurrent.TimeUnit;

/**
 * Created by Daniel on 28/08/2016.
 */
public class UpdateInfoSystemServiceTask extends AbstractSystemServiceTask {

    private final static String ID = "UPDATE_INFO_SYSTEM_SERVICE";
    private final static long REPEAT_TIME = TimeUnit.SECONDS.toMillis(10);
    private final static AlarmType ALARM_TYPE = AlarmType.REPEAT;

    public UpdateInfoSystemServiceTask(Context context) {

        super(context, ID, REPEAT_TIME, ALARM_TYPE, new BackgroundTaskListener() {

            @Override
            public void perform(Context context, Intent intent) {

                Log.i("MyAppLog", "-----> UpdateInfoSystemServiceTask");

                //DO HERE WHATEVER YOU WANT...
            }
        });

        Log.i("MyAppLog", "UpdateInfoSystemServiceTask started.");
    }

}

I like to work with this implementation, but another possible good way, it's don't make the AbstractSystemServiceTask class abstract, and build it through a Builder.

I hope it help you.

UPDATED Improved to allow several BackgroundTaskListener on the same BroadCastReceiver.

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;

import junit.framework.Assert;

import java.util.HashSet;
import java.util.Set;

/**
 * Created by Daniel on 28/08/2016.
 */
public abstract class AbstractSystemServiceTask {

    private final Context context;
    private final AlarmManager alarmManager;
    private final BroadcastReceiver broadcastReceiver;
    private final PendingIntent pendingIntent;

    private final Set<BackgroundTaskListener> backgroundTaskListenerSet;

    public AbstractSystemServiceTask(final Context context, final String id, final long time, final AlarmType alarmType) {

        Assert.assertNotNull("ApplicationContext can't be null", context);
        Assert.assertNotNull("ID can't be null", id);

        this.backgroundTaskListenerSet = new HashSet<>();

        this.context = context;

        this.alarmManager = (AlarmManager) this.context.getSystemService(Context.ALARM_SERVICE);

        this.context.registerReceiver(
                this.broadcastReceiver = this.getBroadcastReceiver(),
                new IntentFilter(id));

        this.configAlarmManager(
                this.pendingIntent = PendingIntent.getBroadcast(this.context, 0, new Intent(id), 0),
                time,
                alarmType);
    }

    public synchronized void registerTask(final BackgroundTaskListener backgroundTaskListener) {

        Assert.assertNotNull("BackgroundTaskListener can't be null", backgroundTaskListener);

        this.backgroundTaskListenerSet.add(backgroundTaskListener);
    }

    public synchronized void removeTask(final BackgroundTaskListener backgroundTaskListener) {

        Assert.assertNotNull("BackgroundTaskListener can't be null", backgroundTaskListener);

        this.backgroundTaskListenerSet.remove(backgroundTaskListener);
    }

    public void stop() {

        this.backgroundTaskListenerSet.clear();

        this.alarmManager.cancel(this.pendingIntent);
        this.context.unregisterReceiver(this.broadcastReceiver);
    }

    private BroadcastReceiver getBroadcastReceiver() {

        return new BroadcastReceiver() {

            @Override
            public void onReceive(final Context context, final Intent intent) {

                for (BackgroundTaskListener backgroundTaskListener : AbstractSystemServiceTask.this.backgroundTaskListenerSet) {

                    backgroundTaskListener.perform(context, intent);
                }
            }
        };
    }

    private void configAlarmManager(final PendingIntent pendingIntent, final long time, final AlarmType alarmType) {

        long ensurePositiveTime = Math.max(time, 0L);

        switch (alarmType) {
            case REPEAT:
                this.alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), ensurePositiveTime, pendingIntent);
                break;
            case ONE_TIME:
            default:
                this.alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + ensurePositiveTime, pendingIntent);
        }
    }

    public interface BackgroundTaskListener {

        void perform(Context context, Intent intent);

    }

    public enum AlarmType {

        REPEAT, ONE_TIME;

    }

}

MySQL query to select events between start/end date

SELECT id
FROM events
WHERE start <= '2013-07-22'
AND end >= '2013-06-13';

Or use MIN() and MAX() if you don't know the precedence.

Removing whitespace between HTML elements when using line breaks

Sorry if this is old but I just found a solution.

Try setting the font-size to 0. Thus the white-spaces in between the images will be 0 in width, and the images won't be affected.

Don't know if this works in all browsers, but I tried it with Chromium and some <li> elements with display: inline-block;.

What is Linux’s native GUI API?

The linux kernel graphical operations are in /include/linux/fb.h as struct fb_ops. Eventually this is what add-ons like X11, Wayland, or DRM appear to reference. As these operations are only for video cards, not vector or raster hardcopy or tty oriented terminal devices, their usefulness as a GUI is limited; it's just not entirely true you need those add-ons to get graphical output if you don't mind using some assembler to bypass syscall as necessary.

Failed to build gem native extension — Rails install

mkmf is part of the ruby1.9.1-dev package. This package contains the header files needed for extension libraries for Ruby 1.9.1. You need to install the ruby1.9.1-dev package by doing:

sudo apt-get install ruby1.9.1-dev

Then you can install Rails as per normal.

Generally it's easier to just do:

sudo apt-get install ruby-dev

Combining two sorted lists in Python

from datetime import datetime
from itertools import chain
from operator import attrgetter

class DT:
    def __init__(self, dt):
        self.dt = dt

list1 = [DT(datetime(2008, 12, 5, 2)),
         DT(datetime(2009, 1, 1, 13)),
         DT(datetime(2009, 1, 3, 5))]

list2 = [DT(datetime(2008, 12, 31, 23)),
         DT(datetime(2009, 1, 2, 12)),
         DT(datetime(2009, 1, 4, 15))]

list3 = sorted(chain(list1, list2), key=attrgetter('dt'))
for item in list3:
    print item.dt

The output:

2008-12-05 02:00:00
2008-12-31 23:00:00
2009-01-01 13:00:00
2009-01-02 12:00:00
2009-01-03 05:00:00
2009-01-04 15:00:00

I bet this is faster than any of the fancy pure-Python merge algorithms, even for large data. Python 2.6's heapq.merge is a whole another story.

Tomcat request timeout

Add tomcat in Eclipse

In Eclipse, as tomcat server, double click "Tomcat v7.0 Server at Localhost", Change the properties as shown in time out settings 45 to whatever sec you like

Setting a windows batch file variable to the day of the week

@ECHO OFF
REM GET DAY OF WEEK VIA DATE TO JULIAN DAY NUMBER CONVERSION
REM ANTONIO PEREZ AYALA
REM GET MONTH, DAY, YEAR VALUES AND ELIMINATE LEFT ZEROS
FOR /F "TOKENS=1-3 DELIMS=/" %%A IN ("%DATE%") DO SET /A MM=10%%A %% 100, DD=10%%B %% 100, YY=%%C
REM CALCULATE JULIAN DAY NUMBER, THEN DAY OF WEEK
IF %MM% LSS 3 SET /A MM+=12, YY-=1
SET /A A=YY/100, B=A/4, C=2-A+B, E=36525*(YY+4716)/100, F=306*(MM+1)/10, JDN=C+DD+E+F-1524
SET /A DOW=(JDN+1)%%7

DOW is 0 for Sunday, 1 for Monday, etc.

Java HashMap: How to get a key and value by index?

If you don't care about the actual key, a concise way to iterate over all the Map's values would be to use its values() method

Map<String, List<String>> myMap;

for ( List<String> stringList : myMap.values() ) {
    for ( String myString : stringList ) {
        // process the string here
    }
}

The values() method is part of the Map interface and returns a Collection view of the values in the map.

What is a "callable"?

Quite simply, a "callable" is something that can be called like a method. The built in function "callable()" will tell you whether something appears to be callable, as will checking for a call property. Functions are callable as are classes, class instances can be callable. See more about this here and here.

How to Implement DOM Data Binding in JavaScript

Yesterday, I started to write my own way to bind data.

It's very funny to play with it.

I think it's beautiful and very useful. At least on my tests using firefox and chrome, Edge must works too. Not sure about others, but if they support Proxy, I think it will work.

https://jsfiddle.net/2ozoovne/1/

<H1>Bind Context 1</H1>
<input id='a' data-bind='data.test' placeholder='Button Text' />
<input id='b' data-bind='data.test' placeholder='Button Text' />
<input type=button id='c' data-bind='data.test' />
<H1>Bind Context 2</H1>
<input id='d' data-bind='data.otherTest' placeholder='input bind' />
<input id='e' data-bind='data.otherTest' placeholder='input bind' />
<input id='f' data-bind='data.test' placeholder='button 2 text - same var name, other context' />
<input type=button id='g' data-bind='data.test' value='click here!' />
<H1>No bind data</H1>
<input id='h' placeholder='not bound' />
<input id='i' placeholder='not bound'/>
<input type=button id='j' />

Here is the code:

(function(){
    if ( ! ( 'SmartBind' in window ) ) { // never run more than once
        // This hack sets a "proxy" property for HTMLInputElement.value set property
        var nativeHTMLInputElementValue = Object.getOwnPropertyDescriptor(HTMLInputElement.prototype, 'value');
        var newDescriptor = Object.getOwnPropertyDescriptor(HTMLInputElement.prototype, 'value');
        newDescriptor.set=function( value ){
            if ( 'settingDomBind' in this )
                return;
            var hasDataBind=this.hasAttribute('data-bind');
            if ( hasDataBind ) {
                this.settingDomBind=true;
                var dataBind=this.getAttribute('data-bind');
                if ( ! this.hasAttribute('data-bind-context-id') ) {
                    console.error("Impossible to recover data-bind-context-id attribute", this, dataBind );
                } else {
                    var bindContextId=this.getAttribute('data-bind-context-id');
                    if ( bindContextId in SmartBind.contexts ) {
                        var bindContext=SmartBind.contexts[bindContextId];
                        var dataTarget=SmartBind.getDataTarget(bindContext, dataBind);
                        SmartBind.setDataValue( dataTarget, value);
                    } else {
                        console.error( "Invalid data-bind-context-id attribute", this, dataBind, bindContextId );
                    }
                }
                delete this.settingDomBind;
            }
            nativeHTMLInputElementValue.set.bind(this)( value );
        }
        Object.defineProperty(HTMLInputElement.prototype, 'value', newDescriptor);

    var uid= function(){
           return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
               var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
               return v.toString(16);
          });
   }

        // SmartBind Functions
        window.SmartBind={};
        SmartBind.BindContext=function(){
            var _data={};
            var ctx = {
                "id" : uid()    /* Data Bind Context Id */
                , "_data": _data        /* Real data object */
                , "mapDom": {}          /* DOM Mapped objects */
                , "mapDataTarget": {}       /* Data Mapped objects */
            }
            SmartBind.contexts[ctx.id]=ctx;
            ctx.data=new Proxy( _data, SmartBind.getProxyHandler(ctx, "data"))  /* Proxy object to _data */
            return ctx;
        }

        SmartBind.getDataTarget=function(bindContext, bindPath){
            var bindedObject=
                { bindContext: bindContext
                , bindPath: bindPath 
                };
            var dataObj=bindContext;
            var dataObjLevels=bindPath.split('.');
            for( var i=0; i<dataObjLevels.length; i++ ) {
                if ( i == dataObjLevels.length-1 ) { // last level, set value
                    bindedObject={ target: dataObj
                    , item: dataObjLevels[i]
                    }
                } else {    // digg in
                    if ( ! ( dataObjLevels[i] in dataObj ) ) {
                        console.warn("Impossible to get data target object to map bind.", bindPath, bindContext);
                        break;
                    }
                    dataObj=dataObj[dataObjLevels[i]];
                }
            }
            return bindedObject ;
        }

        SmartBind.contexts={};
        SmartBind.add=function(bindContext, domObj){
            if ( typeof domObj == "undefined" ){
                console.error("No DOM Object argument given ", bindContext);
                return;
            }
            if ( ! domObj.hasAttribute('data-bind') ) {
                console.warn("Object has no data-bind attribute", domObj);
                return;
            }
            domObj.setAttribute("data-bind-context-id", bindContext.id);
            var bindPath=domObj.getAttribute('data-bind');
            if ( bindPath in bindContext.mapDom ) {
                bindContext.mapDom[bindPath][bindContext.mapDom[bindPath].length]=domObj;
            } else {
                bindContext.mapDom[bindPath]=[domObj];
            }
            var bindTarget=SmartBind.getDataTarget(bindContext, bindPath);
            bindContext.mapDataTarget[bindPath]=bindTarget;
            domObj.addEventListener('input', function(){ SmartBind.setDataValue(bindTarget,this.value); } );
            domObj.addEventListener('change', function(){ SmartBind.setDataValue(bindTarget, this.value); } );
        }

        SmartBind.setDataValue=function(bindTarget,value){
            if ( ! ( 'target' in bindTarget ) ) {
                var lBindTarget=SmartBind.getDataTarget(bindTarget.bindContext, bindTarget.bindPath);
                if ( 'target' in lBindTarget ) {
                    bindTarget.target=lBindTarget.target;
                    bindTarget.item=lBindTarget.item;
                } else {
                    console.warn("Still can't recover the object to bind", bindTarget.bindPath );
                }
            }
            if ( ( 'target' in bindTarget ) ) {
                bindTarget.target[bindTarget.item]=value;
            }
        }
        SmartBind.getDataValue=function(bindTarget){
            if ( ! ( 'target' in bindTarget ) ) {
                var lBindTarget=SmartBind.getDataTarget(bindTarget.bindContext, bindTarget.bindPath);
                if ( 'target' in lBindTarget ) {
                    bindTarget.target=lBindTarget.target;
                    bindTarget.item=lBindTarget.item;
                } else {
                    console.warn("Still can't recover the object to bind", bindTarget.bindPath );
                }
            }
            if ( ( 'target' in bindTarget ) ) {
                return bindTarget.target[bindTarget.item];
            }
        }
        SmartBind.getProxyHandler=function(bindContext, bindPath){
            return  {
                get: function(target, name){
                    if ( name == '__isProxy' )
                        return true;
                    // just get the value
                    // console.debug("proxy get", bindPath, name, target[name]);
                    return target[name];
                }
                ,
                set: function(target, name, value){
                    target[name]=value;
                    bindContext.mapDataTarget[bindPath+"."+name]=value;
                    SmartBind.processBindToDom(bindContext, bindPath+"."+name);
                    // console.debug("proxy set", bindPath, name, target[name], value );
                    // and set all related objects with this target.name
                    if ( value instanceof Object) {
                        if ( !( name in target) || ! ( target[name].__isProxy ) ){
                            target[name]=new Proxy(value, SmartBind.getProxyHandler(bindContext, bindPath+'.'+name));
                        }
                        // run all tree to set proxies when necessary
                        var objKeys=Object.keys(value);
                        // console.debug("...objkeys",objKeys);
                        for ( var i=0; i<objKeys.length; i++ ) {
                            bindContext.mapDataTarget[bindPath+"."+name+"."+objKeys[i]]=target[name][objKeys[i]];
                            if ( typeof value[objKeys[i]] == 'undefined' || value[objKeys[i]] == null || ! ( value[objKeys[i]] instanceof Object ) || value[objKeys[i]].__isProxy )
                                continue;
                            target[name][objKeys[i]]=new Proxy( value[objKeys[i]], SmartBind.getProxyHandler(bindContext, bindPath+'.'+name+"."+objKeys[i]));
                        }
                        // TODO it can be faster than run all items
                        var bindKeys=Object.keys(bindContext.mapDom);
                        for ( var i=0; i<bindKeys.length; i++ ) {
                            // console.log("test...", bindKeys[i], " for ", bindPath+"."+name);
                            if ( bindKeys[i].startsWith(bindPath+"."+name) ) {
                                // console.log("its ok, lets update dom...", bindKeys[i]);
                                SmartBind.processBindToDom( bindContext, bindKeys[i] );
                            }
                        }
                    }
                    return true;
                }
            };
        }
        SmartBind.processBindToDom=function(bindContext, bindPath) {
            var domList=bindContext.mapDom[bindPath];
            if ( typeof domList != 'undefined' ) {
                try {
                    for ( var i=0; i < domList.length ; i++){
                        var dataTarget=SmartBind.getDataTarget(bindContext, bindPath);
                        if ( 'target' in dataTarget )
                            domList[i].value=dataTarget.target[dataTarget.item];
                        else
                            console.warn("Could not get data target", bindContext, bindPath);
                    }
                } catch (e){
                    console.warn("bind fail", bindPath, bindContext, e);
                }
            }
        }
    }
})();

Then, to set, just:

var bindContext=SmartBind.BindContext();
SmartBind.add(bindContext, document.getElementById('a'));
SmartBind.add(bindContext, document.getElementById('b'));
SmartBind.add(bindContext, document.getElementById('c'));

var bindContext2=SmartBind.BindContext();
SmartBind.add(bindContext2, document.getElementById('d'));
SmartBind.add(bindContext2, document.getElementById('e'));
SmartBind.add(bindContext2, document.getElementById('f'));
SmartBind.add(bindContext2, document.getElementById('g'));

setTimeout( function() {
    document.getElementById('b').value='Via Script works too!'
}, 2000);

document.getElementById('g').addEventListener('click',function(){
bindContext2.data.test='Set by js value'
})

For now, I've just added the HTMLInputElement value bind.

Let me know if you know how to improve it.

Arduino Tools > Serial Port greyed out

For a Windows solution I've found that disabling and re-enabling the Arduino in Device Manager, then restarting the Arduino IDE does the trick without fail (no unplugging necessary). Why this error occurs in the first place is beyond me. Perhaps the corresponding method for Linux will fix your problem.

Slightly related (not really), I had an issue with an AVR board a while back which was fixed by setting the device to a new COM port in the driver settings. Again, however you linux bunnies do it, I'm sure it'll be cookies and cream.

Cheers brother,

Unique Key constraints for multiple columns in Entity Framework

In the accepted answer by @chuck, there is a comment saying it will not work in the case of FK.

it worked for me, case of EF6 .Net4.7.2

public class OnCallDay
{
     public int Id { get; set; }
    //[Key]
    [Index("IX_OnCallDateEmployee", 1, IsUnique = true)]
    public DateTime Date { get; set; }
    [ForeignKey("Employee")]
    [Index("IX_OnCallDateEmployee", 2, IsUnique = true)]
    public string EmployeeId { get; set; }
    public virtual ApplicationUser Employee{ get; set; }
}

Angular2 If ngModel is used within a form tag, either the name attribute must be set or the form

Both attributes are needed and also recheck all the form elements has "name" attribute. if you are using form submit concept, other wise just use div tag instead of form element.

<input [(ngModel)]="firstname" name="something">

How can I create my own comparator for a map?

std::map takes up to four template type arguments, the third one being a comparator. E.g.:

struct cmpByStringLength {
    bool operator()(const std::string& a, const std::string& b) const {
        return a.length() < b.length();
    }
};

// ...
std::map<std::string, std::string, cmpByStringLength> myMap;

Alternatively you could also pass a comparator to maps constructor.

Note however that when comparing by length you can only have one string of each length in the map as a key.

Masking password input from the console : Java

A full example ?. Run this code : (NB: This example is best run in the console and not from within an IDE, since the System.console() method might return null in that case.)

import java.io.Console;
public class Main {

    public void passwordExample() {        
        Console console = System.console();
        if (console == null) {
            System.out.println("Couldn't get Console instance");
            System.exit(0);
        }

        console.printf("Testing password%n");
        char[] passwordArray = console.readPassword("Enter your secret password: ");
        console.printf("Password entered was: %s%n", new String(passwordArray));

    }

    public static void main(String[] args) {
        new Main().passwordExample();
    }
}

Calling constructors in c++ without new

Both lines are in fact correct but do subtly different things.

The first line creates a new object on the stack by calling a constructor of the format Thing(const char*).

The second one is a bit more complex. It essentially does the following

Create an object of type Thing using the constructor Thing(const char*)
Create an object of type Thing using the constructor Thing(const Thing&)
Call ~Thing() on the object created in step #1

Error: getaddrinfo ENOTFOUND in nodejs for get call

i have same issue with Amazon server i change my code to this

var connection = mysql.createConnection({
    localAddress     : '35.160.300.66',
    user     : 'root',
    password : 'root',
    database : 'rootdb',
});

check mysql node module https://github.com/mysqljs/mysql

Laravel 5.2 redirect back with success message

You can simply use back() function to redirect no need to use redirect()->back() make sure you are using 5.2 or greater than 5.2 version.

You can replace your code to below code.

return back()->with('message', 'WORKS!');

In the view file replace below code.

@if(session()->has('message'))
    <div class="alert alert-success">
        {{ session()->get('message') }}
    </div>
@endif

For more detail, you can read here

back() is just a helper function. It's doing the same thing as redirect()->back()

How do I convert a dictionary to a JSON String in C#?

Just for reference, among all the older solutions: UWP has its own built-in JSON library, Windows.Data.Json.

JsonObject is a map that you can use directly to store your data:

var options = new JsonObject();
options["foo"] = JsonValue.CreateStringValue("bar");
string json = options.ToString();

Convert a double to a QString

Check out the documentation

Quote:

QString provides many functions for converting numbers into strings and strings into numbers. See the arg() functions, the setNum() functions, the number() static functions, and the toInt(), toDouble(), and similar functions.

How to use Google fonts in React.js?

Had the same issue. Turns out I was using " instead of '.

use @import url('within single quotes'); like this

not @import url("within double quotes"); like this

Style jQuery autocomplete in a Bootstrap input field

The gap between the (bootstrap) input field and jquery-ui autocompleter seem to occur only in jQuery versions >= 3.2

When using jQuery version 3.1.1 it seem to not happen.

Possible reason is the notable update in v3.2.0 related to a bug fix on .width() and .height(). Check out the jQuery release notes for further details: v3.2.0 / v3.1.1

Bootstrap version 3.4.1 and jquery-ui version 1.12.0 used

jQuery Selector: Id Ends With?

The answer to the question is $("[id$='txtTitle']"), as Mark Hurd answered, but for those who, like me, want to find all the elements with an id which starts with a given string (for example txtTitle), try this (doc) :

$("[id^='txtTitle']")

If you want to select elements which id contains a given string (doc) :

$("[id*='txtTitle']")

If you want to select elements which id is not a given string (doc) :

$("[id!='myValue']")

(it also matches the elements that don't have the specified attribute)

If you want to select elements which id contains a given word, delimited by spaces (doc) :

$("[id~='myValue']")

If you want to select elements which id is equal to a given string or starting with that string followed by a hyphen (doc) :

$("[id|='myValue']")

REST / SOAP endpoints for a WCF service

We must define the behavior configuration to REST endpoint

<endpointBehaviors>
  <behavior name="restfulBehavior">
   <webHttp defaultOutgoingResponseFormat="Json" defaultBodyStyle="Wrapped" automaticFormatSelectionEnabled="False" />
  </behavior>
</endpointBehaviors>

and also to a service

<serviceBehaviors>
   <behavior>
     <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true" />
      <serviceDebug includeExceptionDetailInFaults="false" />
   </behavior>
</serviceBehaviors>

After the behaviors, next step is the bindings. For example basicHttpBinding to SOAP endpoint and webHttpBinding to REST.

<bindings>
   <basicHttpBinding>
     <binding name="soapService" />
   </basicHttpBinding>
   <webHttpBinding>
     <binding name="jsonp" crossDomainScriptAccessEnabled="true" />
   </webHttpBinding>
</bindings>

Finally we must define the 2 endpoint in the service definition. Attention for the address="" of endpoint, where to REST service is not necessary nothing.

<services>
  <service name="ComposerWcf.ComposerService">
    <endpoint address="" behaviorConfiguration="restfulBehavior" binding="webHttpBinding" bindingConfiguration="jsonp" name="jsonService" contract="ComposerWcf.Interface.IComposerService" />
    <endpoint address="soap" binding="basicHttpBinding" name="soapService" contract="ComposerWcf.Interface.IComposerService" />
    <endpoint address="mex" binding="mexHttpBinding" name="metadata" contract="IMetadataExchange" />
  </service>
</services>

In Interface of the service we define the operation with its attributes.

namespace ComposerWcf.Interface
{
    [ServiceContract]
    public interface IComposerService
    {
        [OperationContract]
        [WebInvoke(Method = "GET", UriTemplate = "/autenticationInfo/{app_id}/{access_token}", ResponseFormat = WebMessageFormat.Json,
            RequestFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped)]
        Task<UserCacheComplexType_RootObject> autenticationInfo(string app_id, string access_token);
    }
}

Joining all parties, this will be our WCF system.serviceModel definition.

<system.serviceModel>

  <behaviors>
    <endpointBehaviors>
      <behavior name="restfulBehavior">
        <webHttp defaultOutgoingResponseFormat="Json" defaultBodyStyle="Wrapped" automaticFormatSelectionEnabled="False" />
      </behavior>
    </endpointBehaviors>
    <serviceBehaviors>
      <behavior>
        <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true" />
        <serviceDebug includeExceptionDetailInFaults="false" />
      </behavior>
    </serviceBehaviors>
  </behaviors>

  <bindings>
    <basicHttpBinding>
      <binding name="soapService" />
    </basicHttpBinding>
    <webHttpBinding>
      <binding name="jsonp" crossDomainScriptAccessEnabled="true" />
    </webHttpBinding>
  </bindings>

  <protocolMapping>
    <add binding="basicHttpsBinding" scheme="https" />
  </protocolMapping>

  <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />

  <services>
    <service name="ComposerWcf.ComposerService">
      <endpoint address="" behaviorConfiguration="restfulBehavior" binding="webHttpBinding" bindingConfiguration="jsonp" name="jsonService" contract="ComposerWcf.Interface.IComposerService" />
      <endpoint address="soap" binding="basicHttpBinding" name="soapService" contract="ComposerWcf.Interface.IComposerService" />
      <endpoint address="mex" binding="mexHttpBinding" name="metadata" contract="IMetadataExchange" />
    </service>
  </services>

</system.serviceModel>

To test the both endpoint, we can use WCFClient to SOAP and PostMan to REST.

Is it possible to include one CSS file in another?

The CSS @import rule does just that. E.g.,

@import url('/css/common.css');
@import url('/css/colors.css');

How to convert a column of DataTable to a List

Is this what you need?

DataTable myDataTable = new DataTable();
List<int> myList = new List<int>();
foreach (DataRow row in myDataTable.Rows)
{
    myList.Add((int)row[0]);
}

Get index of a key/value pair in a C# dictionary based on the value

In your comment to max's answer, you say that what you really wanted to get is the key in, and not the index of, the KeyValuePair that contains a certain value. You could edit your question to make it more clear.

It is worth pointing out (EricM has touched upon this in his answer) that a value might appear more than once in the dictionary, in which case one would have to think which key he would like to get: e.g. the first that comes up, the last, all of them?

If you are sure that each key has a unique value, you could have another dictionary, with the values from the first acting as keys and the previous keys acting as values. Otherwise, this second dictionary idea (suggested by Jon Skeet) will not work, as you would again have to think which of all the possible keys to use as value in the new dictionary.

If you were asking about the index, though, EricM's answer would be OK. Then you could get the KeyValuePair in question by using:

yourDictionary.ElementAt(theIndexYouFound);

provided that you do not add/remove things in yourDictionary.

PS: I know it's been almost 7 years now, but what the heck. I thought it best to formulate my answer as addressing the OP, but of course by now one can say it is an answer for just about anyone else but the OP. Fully aware of that, thank you.

Python conversion between coordinates

The existing answers can be simplified:

from numpy import exp, abs, angle

def polar2z(r,theta):
    return r * exp( 1j * theta )

def z2polar(z):
    return ( abs(z), angle(z) )

Or even:

polar2z = lambda r,?: r * exp( 1j * ? )
z2polar = lambda z: ( abs(z), angle(z) )

Note these also work on arrays!

rS, thetaS = z2polar( [z1,z2,z3] )
zS = polar2z( rS, thetaS )

Git mergetool generates unwanted .orig files

The option to save the .orig file can be disabled by configuring KDiff3

KDiff3 Backup file .orig option

How to convert characters to HTML entities using plain JavaScript

All the other solutions suggested here, as well as most other JavaScript libraries that do HTML entity encoding/decoding, make several mistakes:

They don’t implement the full list of named character references that browsers support. For example, htmlDecode('&PrecedesSlantEqual;') should return '?' (i.e. '\u227C').
They don’t support encoding astral symbols correctly. For example, htmlEncode('') should return something like 𝌆 or 𝌆. If an implementation returns two separate entities instead (e.g. &#xD834;&#xDF06; or &#55348;&#57094;), it is broken.
They don’t support decoding astral symbols correctly. htmlDecode('𝌆') should return '' and not '?' (i.e. '\uD306').
They don’t implement the character reference overrides table listed in the HTML Standard. For example, htmlDecode('') should return '€' (i.e. '\u20AC').
They should perform decoding in a single pass. For example, htmlDecode('&amp;') should return '&', not &.

For a robust solution that avoids all these issues, use a library I wrote called he for this. From its README:

he (for “HTML entities”) is a robust HTML entity encoder/decoder written in JavaScript. It supports all standardized named character references as per HTML, handles ambiguous ampersands and other edge cases just like a browser would, has an extensive test suite, and — contrary to many other JavaScript solutions — he handles astral Unicode symbols just fine. An online demo is available.

Is there a stopwatch in Java?

Try this...

import java.util.concurrent.TimeUnit;
import com.google.common.base.Stopwatch;

public class StopwatchTest {
     
    public static void main(String[] args) throws Exception {
        Stopwatch stopwatch = Stopwatch.createStarted();
        Thread.sleep(1000 * 60);
        stopwatch.stop(); // optional
        long millis = stopwatch.elapsed(TimeUnit.MILLISECONDS);
        System.out.println("Time in milliseconds "+millis);
        System.out.println("that took: " + stopwatch);
    }
}

HTML5 required attribute seems not working

Absence of Submit field element in the form also causes this error. In the case of "button" field handled by JS to submit form lacks the necessity of Submit button hence Required doesn't Work

MIT vs GPL license

Can I include GPL licensed code in a MIT licensed product?

You can. GPL is free software as well as MIT is, both licenses do not restrict you to bring together the code where as "include" is always two-way.

In copyright for a combined work (that is two or more works form together a work), it does not make much of a difference if the one work is "larger" than the other or not.

So if you include GPL licensed code in a MIT licensed product you will at the same time include a MIT licensed product in GPL licensed code as well.

As a second opinion, the OSI listed the following criteria (in more detail) for both licenses (MIT and GPL):

Free Redistribution
Source Code
Derived Works
Integrity of The Author's Source Code
No Discrimination Against Persons or Groups
No Discrimination Against Fields of Endeavor
Distribution of License
License Must Not Be Specific to a Product
License Must Not Restrict Other Software
License Must Be Technology-Neutral

Both allow the creation of combined works, which is what you've been asking for.

If combining the two works is considered being a derivate, then this is not restricted as well by both licenses.

And both licenses do not restrict to distribute the software.

It seems to me that the chief difference between the MIT license and GPL is that the MIT doesn't require modifications be open sourced whereas the GPL does.

The GPL doesn't require you to release your modifications only because you made them. That's not precise.

You might mix this with distribiution of software under GPL which is not what you've asked about directly.

Is that correct - is the GPL is more restrictive than the MIT license?

This is how I understand it:

As far as distribution counts, you need to put the whole package under GPL. MIT code inside of the package will still be available under MIT whereas the GPL applies to the package as a whole if not limited by higher rights.

"Restrictive" or "more restrictive" / "less restrictive" depends a lot on the point of view. For a software-user the MIT might result in software that is more restricted than the one available under GPL even some call the GPL more restrictive nowadays. That user in specific will call the MIT more restrictive. It's just subjective to say so and different people will give you different answers to that.

As it's just subjective to talk about restrictions of different licenses, you should think about what you would like to achieve instead:

If you want to restrict the use of your modifications, then MIT is able to be more restrictive than the GPL for distribution and that might be what you're looking for.
In case you want to ensure that the freedom of your software does not get restricted that much by the users you distribute it to, then you might want to release under GPL instead of MIT.

As long as you're the author it's you who can decide.

So the most restrictive person ever is the author, regardless of which license anybody is opting for ;)

Static link of shared library function in gcc

Yeah, I know this is an 8 year-old question, but I was told that it was possible to statically link against a shared-object library and this was literally the top hit when I searched for more information about it.

To actually demonstrate that statically linking a shared-object library is not possible with ld (gcc's linker) -- as opposed to just a bunch of people insisting that it's not possible -- use the following gcc command:

gcc -o executablename objectname.o -Wl,-Bstatic -l:libnamespec.so

(Of course you'll have to compile objectname.o from sourcename.c, and you should probably make up your own shared-object library as well. If you do, use -Wl,--library-path,. so that ld can find your library in the local directory.)

The actual error you receive is:

/usr/bin/ld: attempted static link of dynamic object `libnamespec.so'
collect2: error: ld returned 1 exit status

Hope that helps.

Multiple submit buttons in the same form calling different Servlets

In addition to the previous response, the best option to submit a form with different buttons without language problems is actually using a button tag.

<form>
    ...
    <button type="submit" name="submit" value="servlet1">Go to 1st Servlet</button>
    <button type="submit" name="submit" value="servlet2">Go to 2nd Servlet</button>
</form>

Convert month int to month name

CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(
    Convert.ToInt32(e.Row.Cells[7].Text.Substring(3,2))).Substring(0,3) 
    + "-" 
    + Convert.ToDateTime(e.Row.Cells[7].Text).ToString("yyyy");

Git: How configure KDiff3 as merge tool and diff tool

To amend kris' answer, starting with Git 2.20 (Q4 2018), the proper command for git mergetool will be

git config --global merge.guitool kdiff3

That is because "git mergetool" learned to take the "--[no-]gui" option, just like "git difftool" does.

See commit c217b93, commit 57ba181, commit 063f2bd (24 Oct 2018) by Denton Liu (Denton-L).
^{(Merged by Junio C Hamano -- gitster -- in commit 87c15d1, 30 Oct 2018)}

mergetool: accept -g/--[no-]gui as arguments

In line with how difftool accepts a -g/--[no-]gui option, make mergetool accept the same option in order to use the merge.guitool variable to find the default mergetool instead of merge.tool.

npm ERR! Error: EPERM: operation not permitted, rename

Not package.json, but for whatever reason, my node_modules/ had become read-only. Resetting that fixed this.

How to get a Static property with Reflection

Ok so the key for me was to use the .FlattenHierarchy BindingFlag. I don't really know why I just added it on a hunch and it started working. So the final solution that allows me to get Public Instance or Static Properties is:

obj.GetType.GetProperty(propName, Reflection.BindingFlags.Public _
  Or Reflection.BindingFlags.Static Or Reflection.BindingFlags.Instance Or _
  Reflection.BindingFlags.FlattenHierarchy)

Description Box using "onmouseover"

Assuming popup is the ID of your "description box":

HTML

<div id="parent"> <!-- This is the main container, to mouse over -->
<div id="popup" style="display: none">description text here</div>
</div>

JavaScript

var e = document.getElementById('parent');
e.onmouseover = function() {
  document.getElementById('popup').style.display = 'block';
}
e.onmouseout = function() {
  document.getElementById('popup').style.display = 'none';
}

Alternatively you can get rid of JavaScript entirely and do it just with CSS:

CSS

#parent #popup {
  display: none;
}

#parent:hover #popup {
  display: block;
}

How to write a bash script that takes optional input arguments?

how to stop a running script in Matlab

Matlab help says this- For M-files that run a long time, or that call built-ins or MEX-files that run a long time, Ctrl+C does not always effectively stop execution. Typically, this happens on Microsoft Windows platforms rather than UNIX[1] platforms. If you experience this problem, you can help MATLAB break execution by including a drawnow, pause, or getframe function in your M-file, for example, within a large loop. Note that Ctrl+C might be less responsive if you started MATLAB with the -nodesktop option.

So I don't think any option exist. This happens with many matlab functions that are complex. Either we have to wait or don't use them!.

SQL Server reports 'Invalid column name', but the column is present and the query works through management studio

I've gotten this error when running a scalar function using a table value, but the Select statement in my scalar function RETURN clause was missing the "FROM table" portion. :facepalms:

How to Correctly Use Lists in R?

If it helps, I tend to conceive "lists" in R as "records" in other pre-OO languages:

they do not make any assumptions about an overarching type (or rather the type of all possible records of any arity and field names is available).
their fields can be anonymous (then you access them by strict definition order).

The name "record" would clash with the standard meaning of "records" (aka rows) in database parlance, and may be this is why their name suggested itself: as lists (of fields).

onchange event for html.dropdownlist

You can do this

@Html.DropDownList("Sortby", new SelectListItem[] { new SelectListItem() 
  { 

       Text = "Newest to Oldest", Value = "0" }, new SelectListItem() { Text = "Oldest to Newest", Value = "1" } , new
       {
           onchange = @"form.submit();"
       }
})

How can I determine if a String is non-null and not only whitespace in Groovy?

You could add a method to String to make it more semantic:

String.metaClass.getNotBlank = { !delegate.allWhitespace }

which let's you do:

groovy:000> foo = ''
===> 
groovy:000> foo.notBlank
===> false
groovy:000> foo = 'foo'
===> foo
groovy:000> foo.notBlank
===> true

Ruby's File.open gives "No such file or directory - text.txt (Errno::ENOENT)" error

Try using

Dir.glob(".")

To see what's in the directory (and therefore what directory it's looking at).

MySQL JOIN with LIMIT 1 on joined table

Assuming you want product with MIN()imial value in sort column, it would look something like this.

SELECT 
  c.id, c.title, p.id AS product_id, p.title
FROM 
  categories AS c
INNER JOIN (
  SELECT
    p.id, p.category_id, p.title
  FROM
    products AS p
  CROSS JOIN (
    SELECT p.category_id, MIN(sort) AS sort
    FROM products
    GROUP BY category_id
  ) AS sq USING (category_id)
) AS p ON c.id = p.category_id

UNION with WHERE clause

SELECT colA, colB FROM tableA  WHERE colA > 1
UNION
SELECT colX, colA FROM tableB

Reverse the ordering of words in a string

It can be done more simple using sscanf:

void revertWords(char *s);
void revertString(char *s, int start, int n);
void revertWordsInString(char *s);

void revertString(char *s, int start, int end)
{
     while(start<end)
     {
         char temp = s[start];
         s[start] = s[end];
         s[end]=temp;
         start++;
         end --;
     }
}


void revertWords(char *s)
{
  int start = 0;

  char *temp = (char *)malloc(strlen(s) + 1);
  int numCharacters = 0;
  while(sscanf(&s[start], "%s", temp) !=EOF)
  {
      numCharacters = strlen(temp);

      revertString(s, start, start+numCharacters -1);
      start = start+numCharacters + 1;
      if(s[start-1] == 0)
      return;

  }
  free (temp);

}

void revertWordsInString(char *s)
{
   revertString(s,0, strlen(s)-1);
   revertWords(s);
}

int main()
{
   char *s= new char [strlen("abc deff gh1 jkl")+1];
   strcpy(s,"abc deff gh1 jkl");
   revertWordsInString(s);
   printf("%s",s);
   return 0;
}

Split array into chunks

Modified from an answer by dbaseman: https://stackoverflow.com/a/10456344/711085

_x000D_

Object.defineProperty(Array.prototype, 'chunk_inefficient', {_x000D_
  value: function(chunkSize) {_x000D_
    var array = this;_x000D_
    return [].concat.apply([],_x000D_
      array.map(function(elem, i) {_x000D_
        return i % chunkSize ? [] : [array.slice(i, i + chunkSize)];_x000D_
      })_x000D_
    );_x000D_
  }_x000D_
});_x000D_
_x000D_
console.log(_x000D_
  [1, 2, 3, 4, 5, 6, 7].chunk_inefficient(3)_x000D_
)_x000D_
// [[1, 2, 3], [4, 5, 6], [7]]

_x000D_

minor addendum:

I should point out that the above is a not-that-elegant (in my mind) workaround to use Array.map. It basically does the following, where ~ is concatenation:

[[1,2,3]]~[]~[]~[] ~ [[4,5,6]]~[]~[]~[] ~ [[7]]

It has the same asymptotic running time as the method below, but perhaps a worse constant factor due to building empty lists. One could rewrite this as follows (mostly the same as Blazemonger's method, which is why I did not originally submit this answer):

More efficient method:

_x000D_

// refresh page if experimenting and you already defined Array.prototype.chunk_x000D_
_x000D_
Object.defineProperty(Array.prototype, 'chunk', {_x000D_
  value: function(chunkSize) {_x000D_
    var R = [];_x000D_
    for (var i = 0; i < this.length; i += chunkSize)_x000D_
      R.push(this.slice(i, i + chunkSize));_x000D_
    return R;_x000D_
  }_x000D_
});_x000D_
_x000D_
console.log(_x000D_
  [1, 2, 3, 4, 5, 6, 7].chunk(3)_x000D_
)

_x000D_

My preferred way nowadays is the above, or one of the following:

Array.range = function(n) {
  // Array.range(5) --> [0,1,2,3,4]
  return Array.apply(null,Array(n)).map((x,i) => i)
};

Object.defineProperty(Array.prototype, 'chunk', {
  value: function(n) {

    // ACTUAL CODE FOR CHUNKING ARRAY:
    return Array.range(Math.ceil(this.length/n)).map((x,i) => this.slice(i*n,i*n+n));

  }
});

Demo:

> JSON.stringify( Array.range(10).chunk(3) );
[[1,2,3],[4,5,6],[7,8,9],[10]]

Or if you don't want an Array.range function, it's actually just a one-liner (excluding the fluff):

var ceil = Math.ceil;

Object.defineProperty(Array.prototype, 'chunk', {value: function(n) {
    return Array(ceil(this.length/n)).fill().map((_,i) => this.slice(i*n,i*n+n));
}});

Object.defineProperty(Array.prototype, 'chunk', {value: function(n) {
    return Array.from(Array(ceil(this.length/n)), (_,i)=>this.slice(i*n,i*n+n));
}});

Console.WriteLine and generic List

A different approach, just for kicks:

Console.WriteLine(string.Join("\t", list));

How to play a sound using Swift?

Swift 4 (iOS 12 compatible)

var player: AVAudioPlayer?

let path = Bundle.main.path(forResource: "note\(sender.tag)", ofType: "wav")
let url = URL(fileURLWithPath: path ?? "")
    
do {
   player = try AVAudioPlayer(contentsOf: url)
   player?.play()
} catch let error {
   print(error.localizedDescription)
}

jQuery: get parent, parent id?

 $(this).closest('ul').attr('id');

Fixed sidebar navigation in fluid twitter bootstrap 2.0

How can I add or update a query string parameter?

Yeah I had an issue where my querystring would overflow and duplicate, but this was due to my own sluggishness. so I played a bit and worked up some js jquery(actualy sizzle) and C# magick.

So i just realized that after the server has done with the passed values, the values doesn't matter anymore, there is no reuse, if the client wanted to do the same thing evidently it will always be a new request, even if its the same parameters being passed. And thats all clientside, so some caching/cookies etc could be cool in that regards.

JS:

$(document).ready(function () {
            $('#ser').click(function () {
                SerializeIT();
            });
            function SerializeIT() {
                var baseUrl = "";
                baseUrl = getBaseUrlFromBrowserUrl(window.location.toString());
                var myQueryString = "";
                funkyMethodChangingStuff(); //whatever else before serializing and creating the querystring
                myQueryString = $('#fr2').serialize();
                window.location.replace(baseUrl + "?" + myQueryString);
            }
            function getBaseUrlFromBrowserUrl(szurl) {
                return szurl.split("?")[0];
            } 
            function funkyMethodChangingStuff(){
               //do stuff to whatever is in fr2
            }
        });

HTML:

<div id="fr2">
   <input type="text" name="qURL" value="http://somewhere.com" />
   <input type="text" name="qSPart" value="someSearchPattern" />
</div>
<button id="ser">Serialize! and go play with the server.</button>

C#:

    using System.Web;
    using System.Text;
    using System.Collections.Specialized;

    public partial class SomeCoolWebApp : System.Web.UI.Page
    {
        string weburl = string.Empty;
        string partName = string.Empty;

        protected void Page_Load(object sender, EventArgs e)
        {
            string loadurl = HttpContext.Current.Request.RawUrl;
            string querySZ = null;
            int isQuery = loadurl.IndexOf('?');
            if (isQuery == -1) { 
                //If There Was no Query
            }
            else if (isQuery >= 1) {
                querySZ = (isQuery < loadurl.Length - 1) ? loadurl.Substring(isQuery + 1) : string.Empty;
                string[] getSingleQuery = querySZ.Split('?');
                querySZ = getSingleQuery[0];

                NameValueCollection qs = null;
                qs = HttpUtility.ParseQueryString(querySZ);

                weburl = qs["qURL"];
                partName = qs["qSPart"];
                //call some great method thisPageRocks(weburl,partName); or whatever.
          }
      }
  }

Okay criticism is welcome (this was a nightly concoction so feel free to note adjustments). If this helped at all, thumb it up, Happy Coding.

No duplicates, each request as unique as you modified it, and due to how this is structured,easy to add more queries dynamicaly from wthin the dom.

Dynamic button click event handler

You can use AddHandler to add a handler for any event.

For example, this might be:

AddHandler theButton.Click, AddressOf Me.theButton_Click

How I can filter a Datatable?

You can use DataView.

DataView dv = new DataView(yourDatatable);
dv.RowFilter = "query"; // query example = "id = 10"

http://www.csharp-examples.net/dataview-rowfilter/

How do I drag and drop files into an application?

Yet another gotcha:

The framework code that calls the Drag-events swallow all exceptions. You might think your event code is running smoothly, while it is gushing exceptions all over the place. You can't see them because the framework steals them.

That's why I always put a try/catch in these event handlers, just so I know if they throw any exceptions. I usually put a Debugger.Break(); in the catch part.

Before release, after testing, if everything seems to behave, I remove or replace these with real exception handling.

Bootstrap - Uncaught TypeError: Cannot read property 'fn' of undefined

solve this issue for angular

"styles": [
              "src/styles.css",
              "node_modules/bootstrap/dist/css/bootstrap.min.css"
            ],
            "scripts": [
              "node_modules/jquery/dist/jquery.min.js",
              "node_modules/bootstrap/dist/js/bootstrap.min.js"
            ]

org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class

I have faced similar problem

I just do

1.update Maven Project

2.install maven.

How to detect the swipe left or Right in Android?

If you want to catch the event from the starting of the swipe you can use MotionEvent.ACTION_MOVE and store the first value to compare

private float upX1;
private float upX2;
private float upY1;
private float upY2;
private boolean isTouchCaptured = false;
static final int min_distance = 100;


        viewObject.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                    case MotionEvent.ACTION_MOVE: {
                        downX = event.getX();
                        downY = event.getY();

                        if (!isTouchCaptured) {
                            upX1 = event.getX();
                            upY1 = event.getY();
                            isTouchCaptured = true;
                        } else {
                            upX2 = event.getX();
                            upY2 = event.getY();

                            float deltaX = upX1 - upX2;
                            float deltaY = upY1 - upY2;
                            //HORIZONTAL SCROLL
                            if (Math.abs(deltaX) > Math.abs(deltaY)) {
                                if (Math.abs(deltaX) > min_distance) {
                                    // left or right
                                    if (deltaX < 0) {

                                        return true;
                                    }
                                    if (deltaX > 0) {
                                        return true;
                                    }
                                } else {
                                    //not long enough swipe...
                                    return false;
                                }
                            }
                            //VERTICAL SCROLL
                            else {
                                if (Math.abs(deltaY) > min_distance) {
                                    // top or down
                                    if (deltaY < 0) {

                                        return false;
                                    }
                                    if (deltaY > 0) {

                                        return false;
                                    }
                                } else {
                                    //not long enough swipe...
                                    return false;
                                }
                            }
                        }
                        return false;
                    }
                    case MotionEvent.ACTION_UP: {
                        isTouchCaptured = false;
                    }
                }
                return false;

            }
        });

remove inner shadow of text input

Add border: none or border: 0 to remove border at all, or border: 1px solid #ccc to make border thin and flat.

To remove ghost padding in Firefox, you can use ::-moz-focus-inner:

::-moz-focus-inner {
    border: 0;
    padding: 0;
}

See live demo.

HTML5 video won't play in Chrome only

To all of you who got here and did not found the right solution, i found out that the mp4 video needs to fit a specific format.

My Problem was that i got an 1920x1080 video which wont load under Chrome (under Firefox it worked like a charm). After hours of searching i finaly managed to get hang of the problem, the first few streams where 1912x1088 so Chrome wont play it ( i got the exact stream size from the tool MediaInfo). So to fix it i just resized it to 1920x1080 and it worked.

Serialize object to query string in JavaScript/jQuery

Another option might be node-querystring.

It's available in both npm and bower, which is why I have been using it.

Auto reloading python Flask app upon code changes

The current recommended way is with the flask command line utility.

https://flask.palletsprojects.com/en/1.1.x/quickstart/#debug-mode

Example:

$ export FLASK_APP=main.py
$ export FLASK_ENV=development
$ flask run

or in one command:

$ FLASK_APP=main.py FLASK_ENV=development flask run

If you want different port than the default (5000) add --port option.

Example:

$ FLASK_APP=main.py FLASK_ENV=development flask run --port 8080

More options are available with:

$ flask run --help

FLASK_APP can also be set to module:app or module:create_app instead of module.py. See https://flask.palletsprojects.com/en/1.1.x/cli/#application-discovery for a full explanation.

In React Native, how do I put a view on top of another view, with part of it lying outside the bounds of the view behind?

The easiest way to achieve this is with a negative margin.

const deviceWidth = RN.Dimensions.get('window').width

a: {
  alignItems: 'center',
  backgroundColor: 'blue',
  width: deviceWidth,
},
b: {
  marginTop: -16,
  marginStart: 20,
},

Check if string contains only letters in javascript

You need

/^[a-zA-Z]+$/

Currently, you are matching a single character at the start of the input. If your goal is to match letter characters (one or more) from start to finish, then you need to repeat the a-z character match (using +) and specify that you want to match all the way to the end (via $)

Refused to display in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN'

Had an similar issue embeding youtube chat and I figure it out. Maybe there is a similar solution for similar problem.

Refused to display 'https://www.youtube.com/live_chat?v=yDc9BonIXXI&embed_domain=your.domain.web' in a frame because it set 'X-Frame-Options' to 'sameorigin'

My webpage works with www and without it. So to make it work you need to make sure you load the one that is listed on the embed_domain= value... Maybe there is a variable your missing to tell where to embed your iframe. To fix my problem had to write a script to detect the right webpage and execute proper iframe embed domain name.

<iframe src='https://www.youtube.com/live_chat?v=yDc9BonIXXI&embed_domain=your.domain.web' width="100%" height="600" frameborder='no' scrolling='no'></iframe>

<iframe src='https://www.youtube.com/live_chat?v=yDc9BonIXXI&embed_domain=www.your.domain.web' width="100%" height="600" frameborder='no' scrolling='no'></iframe>

Understand you are not using iframes, but still there may be some variable you need to add to your syntax to tell it where the script is going to be used.

How to hide first section header in UITableView (grouped style)

The following worked for me in with iOS 13.6 and Xcode 11.6 with a UITableViewController that was embedded in a UINavigationController:

override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    nil
}

override func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
    .zero
}

No other trickery needed. The override keywords aren't needed when not using a UITableViewController (i.e. when just implemented the UITableViewDelegate methods). Of course if the goal was to hide just the first section's header, then this logic could be wrapped in a conditional as such:

override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    if section == 0 {
        return nil
    } else {
        // Return some other view...
    }
}

override func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
    if section == 0 {
        return .zero
    } else {
        // Return some other height...
    }
}

How to send HTTP request in java?

Here's a complete Java 7 program:

class GETHTTPResource {
  public static void main(String[] args) throws Exception {
    try (java.util.Scanner s = new java.util.Scanner(new java.net.URL("http://tools.ietf.org/rfc/rfc768.txt").openStream())) {
      System.out.println(s.useDelimiter("\\A").next());
    }
  }
}

The new try-with-resources will auto-close the Scanner, which will auto-close the InputStream.

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

You can try this code:

public void itemClicked(View v) {
 //code to check if this checkbox is checked!
 if(((Checkbox)v).isChecked()){
   // code inside if
 }
}

How can we redirect a Java program console output to multiple files?

Go to run as and choose Run Configurations -> Common and in the Standard Input and Output you can choose a File also.

Accessing constructor of an anonymous class

You can have a constructor in the abstract class that accepts the init parameters. The Java spec only specifies that the anonymous class, which is the offspring of the (optionally) abstract class or implementation of an interface, can not have a constructor by her own right.

The following is absolutely legal and possible:

static abstract class Q{
    int z;
    Q(int z){ this.z=z;}
    void h(){
        Q me = new Q(1) {
        };
    }
}

If you have the possibility to write the abstract class yourself, put such a constructor there and use fluent API where there is no better solution. You can this way override the constructor of your original class creating an named sibling class with a constructor with parameters and use that to instantiate your anonymous class.

Tainted canvases may not be exported

In the img tag set crossorigin to Anonymous.

<img crossorigin="anonymous"></img>

Javascript Debugging line by line using Google Chrome

...How can I step through my javascript code line by line using Google Chromes developer tools without it going into javascript libraries?...

For the record: At this time (Feb/2015) both Google Chrome and Firefox have exactly what you (and I) need to avoid going inside libraries and scripts, and go beyond the code that we are interested, It's called Black Boxing:

enter image description here

When you blackbox a source file, the debugger will not jump into that file when stepping through code you're debugging.

More info:

Chrome: Blackbox JavaScript Source Files
Firefox: Black box libraries in the Debugger

Use of the MANIFEST.MF file in Java

The content of the Manifest file in a JAR file created with version 1.0 of the Java Development Kit is the following.

Manifest-Version: 1.0

All the entries are as name-value pairs. The name of a header is separated from its value by a colon. The default manifest shows that it conforms to version 1.0 of the manifest specification. The manifest can also contain information about the other files that are packaged in the archive. Exactly what file information is recorded in the manifest will depend on the intended use for the JAR file. The default manifest file makes no assumptions about what information it should record about other files, so its single line contains data only about itself. Special-Purpose Manifest Headers

Depending on the intended role of the JAR file, the default manifest may have to be modified. If the JAR file is created only for the purpose of archival, then the MANIFEST.MF file is of no purpose. Most uses of JAR files go beyond simple archiving and compression and require special information to be in the manifest file. Summarized below are brief descriptions of the headers that are required for some special-purpose JAR-file functions

Applications Bundled as JAR Files: If an application is bundled in a JAR file, the Java Virtual Machine needs to be told what the entry point to the application is. An entry point is any class with a public static void main(String[] args) method. This information is provided in the Main-Class header, which has the general form:

Main-Class: classname

The value classname is to be replaced with the application's entry point.

Download Extensions: Download extensions are JAR files that are referenced by the manifest files of other JAR files. In a typical situation, an applet will be bundled in a JAR file whose manifest references a JAR file (or several JAR files) that will serve as an extension for the purposes of that applet. Extensions may reference each other in the same way. Download extensions are specified in the Class-Path header field in the manifest file of an applet, application, or another extension. A Class-Path header might look like this, for example:

Class-Path: servlet.jar infobus.jar acme/beans.jar

With this header, the classes in the files servlet.jar, infobus.jar, and acme/beans.jar will serve as extensions for purposes of the applet or application. The URLs in the Class-Path header are given relative to the URL of the JAR file of the applet or application.

Package Sealing: A package within a JAR file can be optionally sealed, which means that all classes defined in that package must be archived in the same JAR file. A package might be sealed to ensure version consistency among the classes in your software or as a security measure. To seal a package, a Name header needs to be added for the package, followed by a Sealed header, similar to this:

Name: myCompany/myPackage/
Sealed: true

The Name header's value is the package's relative pathname. Note that it ends with a '/' to distinguish it from a filename. Any headers following a Name header, without any intervening blank lines, apply to the file or package specified in the Name header. In the above example, because the Sealed header occurs after the Name: myCompany/myPackage header, with no blank lines between, the Sealed header will be interpreted as applying (only) to the package myCompany/myPackage.

Package Versioning: The Package Versioning specification defines several manifest headers to hold versioning information. One set of such headers can be assigned to each package. The versioning headers should appear directly beneath the Name header for the package. This example shows all the versioning headers:

Name: java/util/
Specification-Title: "Java Utility Classes" 
Specification-Version: "1.2"
Specification-Vendor: "Sun Microsystems, Inc.".
Implementation-Title: "java.util" 
Implementation-Version: "build57"
Implementation-Vendor: "Sun Microsystems, Inc."

How to sort rows of HTML table that are called from MySQL

That's actually pretty easy, here's a possible approach:

<table>
    <tr>
        <th>
            <a href="?orderBy=type">Type:</a>
        </th>
        <th>
            <a href="?orderBy=description">Description:</a>
        </th>
        <th>
            <a href="?orderBy=recorded_date">Recorded Date:</a>
        </th>
        <th>
            <a href="?orderBy=added_date">Added Date:</a>
        </th>
    </tr>
</table>
<?php
$orderBy = array('type', 'description', 'recorded_date', 'added_date');

$order = 'type';
if (isset($_GET['orderBy']) && in_array($_GET['orderBy'], $orderBy)) {
    $order = $_GET['orderBy'];
}

$query = 'SELECT * FROM aTable ORDER BY '.$order;

// retrieve and show the data :)
?>

That'll do the trick! :)

How to use WPF Background Worker

using System;  
using System.ComponentModel;   
using System.Threading;    
namespace BackGroundWorkerExample  
{   
    class Program  
    {  
        private static BackgroundWorker backgroundWorker;  

        static void Main(string[] args)  
        {  
            backgroundWorker = new BackgroundWorker  
            {  
                WorkerReportsProgress = true,  
                WorkerSupportsCancellation = true  
            };  

            backgroundWorker.DoWork += backgroundWorker_DoWork;  
            //For the display of operation progress to UI.    
            backgroundWorker.ProgressChanged += backgroundWorker_ProgressChanged;  
            //After the completation of operation.    
            backgroundWorker.RunWorkerCompleted += backgroundWorker_RunWorkerCompleted;  
            backgroundWorker.RunWorkerAsync("Press Enter in the next 5 seconds to Cancel operation:");  

            Console.ReadLine();  

            if (backgroundWorker.IsBusy)  
            { 
                backgroundWorker.CancelAsync();  
                Console.ReadLine();  
            }  
        }  

        static void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)  
        {  
            for (int i = 0; i < 200; i++)  
            {  
                if (backgroundWorker.CancellationPending)  
                {  
                    e.Cancel = true;  
                    return;  
                }  

                backgroundWorker.ReportProgress(i);  
                Thread.Sleep(1000);  
                e.Result = 1000;  
            }  
        }  

        static void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)  
        {  
            Console.WriteLine("Completed" + e.ProgressPercentage + "%");  
        }  

        static void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)  
        {  

            if (e.Cancelled)  
            {  
                Console.WriteLine("Operation Cancelled");  
            }  
            else if (e.Error != null)  
            {  
                Console.WriteLine("Error in Process :" + e.Error);  
            }  
            else  
            {  
                Console.WriteLine("Operation Completed :" + e.Result);  
            }  
        }  
    }  
}

Also, referr the below link you will understand the concepts of Background:

http://www.c-sharpcorner.com/UploadFile/1c8574/threads-in-wpf/

Convert a string to a double - is this possible?

Why is floatval the best option for financial comparison data? bc functions only accurately turn strings into real numbers.

creating a table in ionic

Simply, for me, I used ion-row and ion-col to achieve it. You can make it more neater by doing some changes by CSS.

<ion-row style="border-bottom: groove;">
      <ion-col col-4>
      <ion-label >header</ion-label>
    </ion-col>
    <ion-col col-4>
      <ion-label >header</ion-label>
    </ion-col>
      <ion-col col-4>
      <ion-label >header</ion-label>
    </ion-col>
  </ion-row>
  <ion-row style="border-bottom: groove;">
      <ion-col col-4>
      <ion-label >row</ion-label>
    </ion-col>
    <ion-col col-4>
      <ion-label >02/02/2018</ion-label>
    </ion-col>
      <ion-col col-4>
      <ion-label >row</ion-label>
    </ion-col>
  </ion-row>
  <ion-row style="border-bottom: groove;">
      <ion-col col-4>
      <ion-label >row</ion-label>
    </ion-col>
    <ion-col col-4>
      <ion-label >02/02/2018</ion-label>
    </ion-col>
      <ion-col col-4>
      <ion-label >row</ion-label>
    </ion-col>
  </ion-row>
  <ion-row >
      <ion-col col-4>
      <ion-label >row</ion-label>
    </ion-col>
    <ion-col col-4>
      <ion-label >02/02/2018</ion-label>
    </ion-col>
      <ion-col col-4>
      <ion-label >row</ion-label>
    </ion-col>
  </ion-row>

Fixed height and width for bootstrap carousel

Because some images could have less than 500px of height, it's better to keep the auto-adjust, so i recommend the following:

<div class="carousel-inner" role="listbox" style="max-width:900px; max-height:600px !important;">`

Why was the name 'let' chosen for block-scoped variable declarations in JavaScript?

I think JavaScript's indebtedness to Scheme is obvious here. Scheme not only has let, but has let*, let*-values, let-syntax, and let-values. (See, The Scheme Programming Language, 4th Ed.).

((The choice adds further credence to the notion that JavaScript is Lispy, but--before we get carried away--not homoiconic.))))

Make new column in Panda dataframe by adding values from other columns

You can solve it by adding simply: df['C'] = df['A'] + df['B']

https connection using CURL from command line

use --cacert to specify a .crt file. ca-root-nss.crt for example.

Running Jupyter via command line on Windows

You can add the following to your path

C:[Python Installation path]\Scripts

e.g. C:\Python27\Scripts

It will start working for jupyter and every other pip install you will do here on.

Java RegEx meta character (.) and ordinary dot?

I am doing some basic array in JGrasp and found that with an accessor method for a char[][] array to use ('.') to place a single dot.

pySerial write() won't take my string

I had the same "TypeError: an integer is required" error message when attempting to write. Thanks, the .encode() solved it for me. I'm running python 3.4 on a Dell D530 running 32 bit Windows XP Pro.

I'm omitting the com port settings here:

>>>import serial

>>>ser = serial.Serial(5)

>>>ser.close()

>>>ser.open()

>>>ser.write("1".encode())

1

>>>

What is makeinfo, and how do I get it?

In (at least) Ubuntu when using bash, it tells you what package you need to install if you type in a command and its not found in your path. My terminal says you need to install 'texinfo' package.

sudo apt-get install texinfo

How to count frequency of characters in a string?

If this does not need to be super-fast just create an array of integers, one integer for each letter (only alphabetic so 2*26 integers? or any binary data possible?). go through the string one char at a time, get the index of the responsible integer (e.g. if you only have alphabetic chars you can have 'A' be at index 0 and get that index by subtracting any 'A' to 'Z' by 'A' just as an example of how you can get reasonably fast indices) and increment the value in that index.

There are various micro-optimizations to make this faster (if necessary).

What are callee and caller saved registers?

The caller-saved / callee-saved terminology is based on a pretty braindead inefficient model of programming where callers actually do save/restore all the call-clobbered registers (instead of keeping long-term-useful values elsewhere), and callees actually do save/restore all the call-preserved registers (instead of just not using some or any of them).

Or you have to understand that "caller-saved" means "saved somehow if you want the value later".

In reality, efficient code lets values get destroyed when they're no longer needed. Compilers typically make functions that save a few call-preserved registers at the start of a function (and restore them at the end). Inside the function, they use those regs for values that need to survive across function calls.

I prefer "call-preserved" vs. "call-clobbered", which are unambiguous and self-describing once you've heard of the basic concept, and don't require any serious mental gymnastics to think about from the caller's perspective or the callee's perspective. (Both terms are from the same perspective).

Plus, these terms differ by more than one letter.

The terms volatile / non-volatile are pretty good, by analogy with storage which loses its value on power-loss or not, (like DRAM vs. Flash). But the C volatile keyword has a totally different technical meaning, so that's a downside to "(non)-volatile" when describing C calling conventions.

Call-clobbered, aka caller-saved or volatile registers are good for scratch / temporary values that aren't needed after the next function call.

From the callee's perspective, your function can freely overwrite (aka clobber) these registers without saving/restoring.

From a caller's perspective, call foo destroys (aka clobbers) all the call-clobbered registers, or at least you have to assume it does.

You can write private helper functions that have a custom calling convention, e.g. you know they don't modify a certain register. But if all you know (or want to assume or depend on) is that the target function follows the normal calling convention, then you have to treat a function call as if it does destroy all the call-clobbered registers. That's literally what the name come from: a call clobbers those registers.

Some compilers that do inter-procedural optimization can also create internal-use-only definitions of functions that don't follow the ABI, using a custom calling convention.

Call-preserved, aka callee-saved or non-volatile registers keep their values across function calls. This is useful for loop variables in a loop that makes function calls, or basically anything in a non-leaf function in general.

From a callee's perspective, these registers can't be modified unless you save the original value somewhere so you can restore it before returning. Or for registers like the stack pointer (which is almost always call-preserved), you can subtract a known offset and add it back again before returning, instead of actually saving the old value anywhere. i.e. you can restore it by dead reckoning, unless you allocate a runtime-variable amount of stack space. Then typically you restore the stack pointer from another register.

A function that can benefit from using a lot of registers can save/restore some call-preserved registers just so it can use them as more temporaries, even if it doesn't make any function calls. Normally you'd only do this after running out of call-clobbered registers to use, because save/restore typically costs a push/pop at the start/end of the function. (Or if your function has multiple exit paths, a pop in each of them.)

The name "caller-saved" is misleading: you don't have to specially save/restore them. Normally you arrange your code to have values that need to survive a function call in call-preserved registers, or somewhere on the stack, or somewhere else that you can reload from. It's normal to let a call destroy temporary values.

An ABI or calling convention defines which are which

See for example What registers are preserved through a linux x86-64 function call for the x86-64 System V ABI.

Also, arg-passing registers are always call-clobbered in all function-calling conventions I'm aware of. See Are rdi and rsi caller saved or callee saved registers?

But system-call calling conventions typically make all the registers except the return value call-preserved. (Usually including even condition-codes / flags.) See What are the calling conventions for UNIX & Linux system calls on i386 and x86-64

Setting up MySQL and importing dump within Dockerfile

Here is a working version using v3 of docker-compose.yml. The key is the volumes directive:

mysql:
  image: mysql:5.6
  ports:
    - "3306:3306"
  environment:
    MYSQL_ROOT_PASSWORD: root
    MYSQL_USER: theusername
    MYSQL_PASSWORD: thepw
    MYSQL_DATABASE: mydb
  volumes:
    - ./data:/docker-entrypoint-initdb.d

In the directory that I have my docker-compose.yml I have a data dir that contains .sql dump files. This is nice because you can have a .sql dump file per table.

I simply run docker-compose up and I'm good to go. Data automatically persists between stops. If you want remove the data and "suck in" new .sql files run docker-compose down then docker-compose up.

If anyone knows how to get the mysql docker to re-process files in /docker-entrypoint-initdb.d without removing the volume, please leave a comment and I will update this answer.

Carriage return and Line feed... Are both required in C#?

It depends on where you're displaying the text. On the console or a textbox for example, \n will suffice. On a RichTextBox I think you need both.

Select distinct values from a large DataTable column

Method 1:

   DataView view = new DataView(table);
   DataTable distinctValues = view.ToTable(true, "id");

Method 2: You will have to create a class matching your datatable column names and then you can use the following extension method to convert Datatable to List

    public static List<T> ToList<T>(this DataTable table) where T : new()
    {
        List<PropertyInfo> properties = typeof(T).GetProperties().ToList();
        List<T> result = new List<T>();

        foreach (var row in table.Rows)
        {
            var item = CreateItemFromRow<T>((DataRow)row, properties);
            result.Add(item);
        }

        return result;
    }

    private static T CreateItemFromRow<T>(DataRow row, List<PropertyInfo> properties) where T : new()
    {
        T item = new T();
        foreach (var property in properties)
        {
            if (row.Table.Columns.Contains(property.Name))
            {
                if (row[property.Name] != DBNull.Value)
                    property.SetValue(item, row[property.Name], null);
            }
        }
        return item;
    }

and then you can get distinct from list using

      YourList.Select(x => x.Id).Distinct();

Please note that this will return you complete Records and not just ids.

PHP AES encrypt / decrypt

Here's an improved version based on code written by blade

add comments
overwrite arguments before throwing to avoid leaking secrets with the exception
check return values from openssl and hmac functions

The code:

class Crypto
{
    /**
     * Encrypt data using OpenSSL (AES-256-CBC)
     * @param string $plaindata Data to be encrypted
     * @param string $cryptokey key for encryption (with 256 bit of entropy)
     * @param string $hashkey key for hashing (with 256 bit of entropy)
     * @return string IV+Hash+Encrypted as raw binary string. The first 16
     *     bytes is IV, next 32 bytes is HMAC-SHA256 and the rest is
     *     $plaindata as encrypted.
     * @throws Exception on internal error
     *
     * Based on code from: https://stackoverflow.com/a/46872528
     */
    public static function encrypt($plaindata, $cryptokey, $hashkey)
    {
        $method = "AES-256-CBC";
        $key = hash('sha256', $cryptokey, true);
        $iv = openssl_random_pseudo_bytes(16);

        $cipherdata = openssl_encrypt($plaindata, $method, $key, OPENSSL_RAW_DATA, $iv);

        if ($cipherdata === false)
        {
            $cryptokey = "**REMOVED**";
            $hashkey = "**REMOVED**";
            throw new \Exception("Internal error: openssl_encrypt() failed:".openssl_error_string());
        }

        $hash = hash_hmac('sha256', $cipherdata.$iv, $hashkey, true);

        if ($hash === false)
        {
            $cryptokey = "**REMOVED**";
            $hashkey = "**REMOVED**";
            throw new \Exception("Internal error: hash_hmac() failed");
        }

        return $iv.$hash.$cipherdata;
    }

    /**
    * Decrypt data using OpenSSL (AES-256-CBC)
     * @param string $encrypteddata IV+Hash+Encrypted as raw binary string
     *     where the first 16 bytes is IV, next 32 bytes is HMAC-SHA256 and
     *     the rest is encrypted payload.
     * @param string $cryptokey key for decryption (with 256 bit of entropy)
     * @param string $hashkey key for hashing (with 256 bit of entropy)
     * @return string Decrypted data
     * @throws Exception on internal error
     *
     * Based on code from: https://stackoverflow.com/a/46872528
     */
    public static function decrypt($encrypteddata, $cryptokey, $hashkey)
    {
        $method = "AES-256-CBC";
        $key = hash('sha256', $cryptokey, true);
        $iv = substr($encrypteddata, 0, 16);
        $hash = substr($encrypteddata, 16, 32);
        $cipherdata = substr($encrypteddata, 48);

        if (!hash_equals(hash_hmac('sha256', $cipherdata.$iv, $hashkey, true), $hash))
        {
            $cryptokey = "**REMOVED**";
            $hashkey = "**REMOVED**";
            throw new \Exception("Internal error: Hash verification failed");
        }

        $plaindata = openssl_decrypt($cipherdata, $method, $key, OPENSSL_RAW_DATA, $iv);

        if ($plaindata === false)
        {
            $cryptokey = "**REMOVED**";
            $hashkey = "**REMOVED**";
            throw new \Exception("Internal error: openssl_decrypt() failed:".openssl_error_string());
        }

        return $plaindata;
    }
}

If you truly cannot have proper encryption and hash keys but have to use an user entered password as the only secret, you can do something like this:

/**
 * @param string $password user entered password as the only source of
 *   entropy to generate encryption key and hash key.
 * @return array($encryption_key, $hash_key) - note that PBKDF2 algorithm
 *   has been configured to take around 1-2 seconds per conversion
 *   from password to keys on a normal CPU to prevent brute force attacks.
 */
public static function generate_encryptionkey_hashkey_from_password($password)
{
    $hash = hash_pbkdf2("sha512", "$password", "salt$password", 1500000);
    return str_split($hash, 64);
}

Selecting with complex criteria from pandas.DataFrame

You can use pandas it has some built in functions for comparison. So if you want to select values of "A" that are met by the conditions of "B" and "C" (assuming you want back a DataFrame pandas object)

df[['A']][df.B.gt(50) & df.C.ne(900)]

df[['A']] will give you back column A in DataFrame format.

pandas 'gt' function will return the positions of column B that are greater than 50 and 'ne' will return the positions not equal to 900.

How to insert a file in MySQL database?

The BLOB datatype is best for storing files.

See: How to store .pdf files into MySQL as BLOBs using PHP?
The MySQL BLOB reference manual has some interesting comments

How do I set a JLabel's background color?

You must set the setOpaque(true) to true other wise the background will not be painted to the form. I think from reading that if it is not set to true that it will paint some or not any of its pixels to the form. The background is transparent by default which seems odd to me at least but in the way of programming you have to set it to true as shown below.

      JLabel lb = new JLabel("Test");
      lb.setBackground(Color.red);
      lb.setOpaque(true); <--This line of code must be set to true or otherwise the

From the JavaDocs

setOpaque

public void setOpaque(boolean isOpaque)
  If true the component paints every pixel within its bounds. Otherwise, 
  the component may not paint some or all of its pixels, allowing the underlying 
  pixels to show through.
  The default value of this property is false for JComponent. However, 
  the default value for this property on most standard JComponent subclasses 
   (such as JButton and JTree) is look-and-feel dependent.

Parameters:
isOpaque - true if this component should be opaque
See Also:
isOpaque()

Error after upgrading pip: cannot import name 'main'

I use sudo apt remove python3-pip then pip works.

 ~ sudo pip install pip --upgrade
[sudo] password for sen: 
Traceback (most recent call last):
  File "/usr/bin/pip", line 9, in <module>
    from pip import main
ImportError: cannot import name 'main'
?  ~ sudo apt remove python3-pip   
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libexpat1-dev libpython3-dev libpython3.5-dev python-pip-whl python3-dev python3-wheel
  python3.5-dev
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
  python3-pip
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 569 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 215769 files and directories currently installed.)
Removing python3-pip (8.1.1-2ubuntu0.4) ...
Processing triggers for man-db (2.7.5-1) ...
?  ~ pip

Usage:   
  pip <command> [options]

XML parsing of a variable string in JavaScript

Most examples on the web (and some presented above) show how to load an XML from a file in a browser compatible manner. This proves easy, except in the case of Google Chrome which does not support the document.implementation.createDocument() method. When using Chrome, in order to load an XML file into a XmlDocument object, you need to use the inbuilt XmlHttp object and then load the file by passing it's URI.

In your case, the scenario is different, because you want to load the XML from a string variable, not a URL. For this requirement however, Chrome supposedly works just like Mozilla (or so I've heard) and supports the parseFromString() method.

Here is a function I use (it's part of the Browser compatibility library I'm currently building):

function LoadXMLString(xmlString)
{
  // ObjectExists checks if the passed parameter is not null.
  // isString (as the name suggests) checks if the type is a valid string.
  if (ObjectExists(xmlString) && isString(xmlString))
  {
    var xDoc;
    // The GetBrowserType function returns a 2-letter code representing
    // ...the type of browser.
    var bType = GetBrowserType();

    switch(bType)
    {
      case "ie":
        // This actually calls into a function that returns a DOMDocument 
        // on the basis of the MSXML version installed.
        // Simplified here for illustration.
        xDoc = new ActiveXObject("MSXML2.DOMDocument")
        xDoc.async = false;
        xDoc.loadXML(xmlString);
        break;
      default:
        var dp = new DOMParser();
        xDoc = dp.parseFromString(xmlString, "text/xml");
        break;
    }
    return xDoc;
  }
  else
    return null;
}

PHP is not recognized as an internal or external command in command prompt

Set "C:\xampp\php" in your PATH Environment Variable. Then restart CMD prompt.

How can I kill whatever process is using port 8080 so that I can vagrant up?

I needed to kill processes on different ports so I created a bash script:

killPort() {
  PID=$(echo $(lsof -n -i4TCP:$1) | awk 'NR==1{print $11}')
  kill -9 $PID
}

Just add that to your .bashrc and run it like this:

killPort 8080

You can pass whatever port number you wish

How to open Form in Add record

How to display the current time and date in C#

DateTime.Now.Tostring();

. You can supply parameters to To string function in a lot of ways like given in this link http://www.geekzilla.co.uk/View00FF7904-B510-468C-A2C8-F859AA20581F.htm

This will be a lot useful. If you reside somewhere else than the regular format (MM/dd/yyyy)

use always MM not mm, mm gives minutes and MM gives month.

Segmentation Fault - C

s is an uninitialized pointer; you are writing to a random location in memory. This will invoke undefined behaviour.

You need to allocate some memory for s. Also, never use gets; there is no way to prevent it overflowing the memory you allocate. Use fgets instead.

Alter MySQL table to add comments on columns

As per the documentation you can add comments only at the time of creating table. So it is must to have table definition. One way to automate it using the script to read the definition and update your comments.

Reference:

http://cornempire.net/2010/04/15/add-comments-to-column-mysql/

http://bugs.mysql.com/bug.php?id=64439

How to get current user who's accessing an ASP.NET application?

The general consensus answer above seems to have have a compatibility issue with CORS support. In order to use the HttpContext.Current.User.Identity.Name attribute you must disable anonymous authentication in order to force Windows authentication to provide the authenticated user information. Unfortunately, I believe you must have anonymous authentication enabled in order to process the pre-flight OPTIONS request in a CORS scenario.

You can get around this by leaving anonymous authentication enabled and using the HttpContext.Current.Request.LogonUserIdentity attribute instead. This will return the authenticated user information (assuming you are in an intranet scenario) even with anonymous authentication enabled. The attribute returns a WindowsUser data structure and both are defined in the System.Web namespace

        using System.Web;
        WindowsIdentity user;
        user  = HttpContext.Current.Request.LogonUserIdentity;

How do you push just a single Git branch (and no other branches)?

yes, just do the following

git checkout feature_x
git push origin feature_x

Bootstrap 3 jquery event for active tab change

To add to Mosh Feu answer, if the tabs where created on the fly like in my case, you would use the following code

$(document).on('shown.bs.tab', 'a[data-toggle="tab"]', function (e) {
    var tab = $(e.target);
    var contentId = tab.attr("href");

    //This check if the tab is active
    if (tab.parent().hasClass('active')) {
         console.log('the tab with the content id ' + contentId + ' is visible');
    } else {
         console.log('the tab with the content id ' + contentId + ' is NOT visible');
    }

});

I hope this helps someone

Programmatically get height of navigation bar

Do something like this ?

    NSLog(@"Navframe Height=%f",
        self.navigationController.navigationBar.frame.size.height);

The swift version is located here

UPDATE

iOS 13

As the statusBarFrame was deprecated in iOS13 you can use this:

extension UIViewController {

    /**
     *  Height of status bar + navigation bar (if navigation bar exist)
     */

    var topbarHeight: CGFloat {
        return (view.window?.windowScene?.statusBarManager?.statusBarFrame.height ?? 0.0) +
            (self.navigationController?.navigationBar.frame.height ?? 0.0)
    }
}

java.lang.UnsupportedClassVersionError: Bad version number in .class file?

I've learned that error messages like this are usually right. When it couldn't POSSIBLY (in your mind) be what the error being reported says, you go hunting for a problem in another area...only to find out hours later that the original error message was indeed right.

Since you're using Eclipse, I think Thilo has it right The most likely reason you are getting this message is because one of your projects is compiling 1.6 classes. It doesn't matter if you only have a 1.5 JRE on the system, because Eclipse has its own compiler (not javac), and only needs a 1.5 JRE to compile 1.6 classes. It may be weird, and a setting needs to be unchecked to allow this, but I just managed to do it.

For the project in question, check the Project Properties (usually Alt+Enter), Java Compiler section. Here's an image of a project configured to compile 1.6, but with only a 1.5 JRE.

enter image description here

How do I navigate to a parent route from a child route?

None of this worked for me ... Here is my code with the back function :

import { Router } from '@angular/router';
...
constructor(private router: Router) {}
...
back() {
   this.router.navigate([this.router.url.substring(0, this.router.url.lastIndexOf('/'))]);
}

this.router.url.substring(0, this.router.url.lastIndexOf('/') --> get the last part of the current url after the "/" --> get the current route.

Call external javascript functions from java code

try {
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("JavaScript");
        System.out.println("okay1");
        FileInputStream fileInputStream = new FileInputStream("C:/Users/Kushan/eclipse-workspace/sureson.lk/src/main/webapp/js/back_end_response.js");
        System.out.println("okay2");
        if (fileInputStream != null){
         BufferedReader reader = new BufferedReader(new InputStreamReader(fileInputStream));
         engine.eval(reader);
         System.out.println("okay3");
        // Invocable javascriptEngine = null;
         System.out.println("okay4");
        Invocable invocableEngine = (Invocable)engine;
         System.out.println("okay5");
         int x=0;
         System.out.println("invocableEngine is : "+invocableEngine);
         Object object = invocableEngine.invokeFunction("backend_message",x);

         System.out.println("okay6");
        }
        }catch(Exception e) {
            System.out.println("erroe when calling js function"+ e);
        }

How do I negate a test with regular expressions in a bash script?

You had it right, just put a space between the ! and the [[ like if ! [[

Image inside div has extra space below the image

I found it works great using display:block; on the image and vertical-align:top; on the text.

_x000D_

.imagebox {_x000D_
    width:200px;_x000D_
    float:left;_x000D_
    height:88px;_x000D_
    position:relative;_x000D_
    background-color: #999;_x000D_
}_x000D_
.container {_x000D_
    width:600px;_x000D_
    height:176px;_x000D_
    background-color: #666;_x000D_
    position:relative;_x000D_
    overflow:hidden;_x000D_
}_x000D_
.text {_x000D_
    color: #000;_x000D_
    font-size: 11px;_x000D_
    font-family: robotomeduim, sans-serif;_x000D_
    vertical-align:top;_x000D_
    _x000D_
}_x000D_
_x000D_
.imagebox img{ display:block;}

_x000D_

<div class="container">_x000D_
    <div class="imagebox">_x000D_
        <img src="http://machdiamonds.com/n69xvs.jpg" /> <span class="text">Image title</span>_x000D_
    </div>_x000D_
    <div class="imagebox">_x000D_
        <img src="http://machdiamonds.com/n69xvs.jpg" /> <span class="text">Image title</span>_x000D_
    </div>_x000D_
    <div class="imagebox">_x000D_
        <img src="http://machdiamonds.com/n69xvs.jpg" /> <span class="text">Image title</span>_x000D_
    </div>_x000D_
    <div class="imagebox">_x000D_
        <img src="http://machdiamonds.com/n69xvs.jpg" /> <span class="text">Image title</span>_x000D_
    </div>_x000D_
    <div class="imagebox">_x000D_
        <img src="http://machdiamonds.com/n69xvs.jpg" /> <span class="text">Image title</span>_x000D_
    </div>_x000D_
    <div class="imagebox">_x000D_
        <img src="http://machdiamonds.com/n69xvs.jpg" /> <span class="text">Image title</span>_x000D_
    </div>_x000D_
</div>

_x000D_

or you can edit the code a JS FIDDLE

Array and string offset access syntax with curly braces is deprecated

It's really simple to fix the issue, however keep in mind that you should fork and commit your changes for each library you are using in their repositories to help others as well.

Let's say you have something like this in your code:

$str = "test";
echo($str{0});

since PHP 7.4 curly braces method to get individual characters inside a string has been deprecated, so change the above syntax into this:

$str = "test";
echo($str[0]);

Fixing the code in the question will look something like this:

public function getRecordID(string $zoneID, string $type = '', string $name = ''): string
{
    $records = $this->listRecords($zoneID, $type, $name);
    if (isset($records->result[0]->id)) {
        return $records->result[0]->id;
    }
    return false;
}

Convert integer into its character equivalent, where 0 => a, 1 => b, etc

Use String.fromCharCode. This returns a string from a Unicode value, which matches the first 128 characters of ASCII.

var a = String.fromCharCode(97);

How to preview a part of a large pandas DataFrame, in iPython notebook?

In Python pandas provide head() and tail() to print head and tail data respectively.

import pandas as pd
train = pd.read_csv('file_name')
train.head() # it will print 5 head row data as default value is 5
train.head(n) # it will print n head row data
train.tail() #it will print 5 tail row data as default value is 5
train.tail(n) #it will print n tail row data

Pass a String from one Activity to another Activity in Android

In activity1

    String easyPuzzle  = "630208010200050089109060030"+
                 "008006050000187000060500900"+
                 "09007010681002000502003097";

    Intent i = new Intent (this, activity2.class);

    i.putExtra("puzzle", easyPuzzle);
    startActivity(i);

In activity2

    Intent i = getIntent();
    String easyPuzzle = i.getStringExtra("puzzle");

Can't find System.Windows.Media namespace?

The System.Windows.Media.Imaging namespace is part of PresentationCore.dll (if you are using Visual Studio 2008 then the WPF application template will automatically add this reference). Note that this namespace is not a direct wrapping of the WIC library, although a large proportion of the more common uses are still available and it is relatively obvious how these map to the WIC versions. For more information on the classes in this namespace check out

http://msdn2.microsoft.com/en-us/library/system.windows.media.imaging.aspx

What is the naming convention in Python for variable and function names?

further to what @JohnTESlade has answered. Google's python style guide has some pretty neat recommendations,

Names to Avoid

single character names except for counters or iterators
dashes (-) in any package/module name
\__double_leading_and_trailing_underscore__ names (reserved by Python)

Naming Convention

"Internal" means internal to a module or protected or private within a class.
Prepending a single underscore (_) has some support for protecting module variables and functions (not included with import * from). Prepending a double underscore (__) to an instance variable or method effectively serves to make the variable or method private to its class (using name mangling).
Place related classes and top-level functions together in a module. Unlike Java, there is no need to limit yourself to one class per module.
Use CapWords for class names, but lower_with_under.py for module names. Although there are many existing modules named CapWords.py, this is now discouraged because it's confusing when the module happens to be named after a class. ("wait -- did I write import StringIO or from StringIO import StringIO?")

Guidelines derived from Guido's Recommendations

How to uncommit my last commit in Git

Just a note - if you're using ZSH and see the error

zsh: no matches found: HEAD^

You need to escape the ^

git reset --soft HEAD\^

Problems after upgrading to Xcode 10: Build input file cannot be found

For Swift files or files that belong to the project such as:

Build input file cannot be found: PATH/TO/FILE/FILE.swift

This issue can happen when files or folders have been removed or moved in the project.

To fix it:

Go in the project-navigator, select your project
Select Build Phasestab
In Compile Sources section, check for the file(s) that Xcode is complaining of
Notice that the file(s) have the wrong path, and delete them by clicking on the minus icon
Re-add the file(s) by clicking the plus icon and search in the project.
Product > Clean Build Folder
Build

You generally find these missing files in the Recovered References folder of Xcode in the project tree (look for the search bar at the bottom-left of Xcode and search for your complaining file):

Deleting them from this folder can also solve the error.

"CASE" statement within "WHERE" clause in SQL Server 2008

CASE LEN('TestPerson')
    WHEN 0 THEN co.personentered  = co.personentered ELSE co.personentered LIKE '%TestPerson'

Try the following:

... and ( 
    (LEN('TestPerson') = 0 and co.personentered  = co.personentered) or
    (LEN('TestPerson') <> 0 and co.personentered LIKE '%TestPerson') ) and ...

Cache an HTTP 'Get' service response in AngularJS?

I think there's an even easier way now. This enables basic caching for all $http requests (which $resource inherits):

 var app = angular.module('myApp',[])
      .config(['$httpProvider', function ($httpProvider) {
            // enable http caching
           $httpProvider.defaults.cache = true;
      }])

What is the difference between Task.Run() and Task.Factory.StartNew()

According to this post by Stephen Cleary, Task.Factory.StartNew() is dangerous:

I see a lot of code on blogs and in SO questions that use Task.Factory.StartNew to spin up work on a background thread. Stephen Toub has an excellent blog article that explains why Task.Run is better than Task.Factory.StartNew, but I think a lot of people just haven’t read it (or don’t understand it). So, I’ve taken the same arguments, added some more forceful language, and we’ll see how this goes. :) StartNew does offer many more options than Task.Run, but it is quite dangerous, as we’ll see. You should prefer Task.Run over Task.Factory.StartNew in async code.

Here are the actual reasons:

Does not understand async delegates. This is actually the same as point 1 in the reasons why you would want to use StartNew. The problem is that when you pass an async delegate to StartNew, it’s natural to assume that the returned task represents that delegate. However, since StartNew does not understand async delegates, what that task actually represents is just the beginning of that delegate. This is one of the first pitfalls that coders encounter when using StartNew in async code.

Confusing default scheduler. OK, trick question time: in the code below, what thread does the method “A” run on?

Task.Factory.StartNew(A);

private static void A() { }

Well, you know it’s a trick question, eh? If you answered “a thread pool thread”, I’m sorry, but that’s not correct. “A” will run on whatever TaskScheduler is currently executing!

So that means it could potentially run on the UI thread if an operation completes and it marshals back to the UI thread due to a continuation as Stephen Cleary explains more fully in his post.

In my case, I was trying to run tasks in the background when loading a datagrid for a view while also displaying a busy animation. The busy animation didn't display when using Task.Factory.StartNew() but the animation displayed properly when I switched to Task.Run().

For details, please see https://blog.stephencleary.com/2013/08/startnew-is-dangerous.html

Laravel - Eloquent "Has", "With", "WhereHas" - What do they mean?

With

with() is for eager loading. That basically means, along the main model, Laravel will preload the relationship(s) you specify. This is especially helpful if you have a collection of models and you want to load a relation for all of them. Because with eager loading you run only one additional DB query instead of one for every model in the collection.

Example:

User > hasMany > Post

$users = User::with('posts')->get();
foreach($users as $user){
    $users->posts; // posts is already loaded and no additional DB query is run
}

Has

has() is to filter the selecting model based on a relationship. So it acts very similarly to a normal WHERE condition. If you just use has('relation') that means you only want to get the models that have at least one related model in this relation.

Example:

User > hasMany > Post

$users = User::has('posts')->get();
// only users that have at least one post are contained in the collection

WhereHas

whereHas() works basically the same as has() but allows you to specify additional filters for the related model to check.

Example:

User > hasMany > Post

$users = User::whereHas('posts', function($q){
    $q->where('created_at', '>=', '2015-01-01 00:00:00');
})->get();
// only users that have posts from 2015 on forward are returned

phpmysql error - #1273 - #1273 - Unknown collation: 'utf8mb4_general_ci'

When you export you use the compatibility system set to MYSQL40. Worked for me.

How to process POST data in Node.js?

Limit POST size avoid flood your node app. There is a great raw-body module, suitable both for express and connect, that can help you limit request by size and length.

Apply CSS rules if browser is IE

I prefer using a separate file for ie rules, as described earlier.

<!--[if IE]><link rel="stylesheet" type="text/css" href="ie-style.css"/><![endif]-->

And inside it you can set up rules for different versions of ie using this:

.abc {...} /* ALL MSIE */
*html *.abc {...} /* MSIE 6 */
*:first-child+html .abc {...} /* MSIE 7 */

PHP Pass variable to next page

HTML / HTTP is stateless, in other words, what you did / saw on the previous page, is completely unconnected with the current page. Except if you use something like sessions, cookies or GET / POST variables. Sessions and cookies are quite easy to use, with session being by far more secure than cookies. More secure, but not completely secure.

Session:

//On page 1
$_SESSION['varname'] = $var_value;

//On page 2
$var_value = $_SESSION['varname'];

Remember to run the session_start(); statement on both these pages before you try to access the $_SESSION array, and also before any output is sent to the browser.

Cookie:

//One page 1
$_COOKIE['varname'] = $var_value;

//On page 2
$var_value = $_COOKIE['varname'];

The big difference between sessions and cookies is that the value of the variable will be stored on the server if you're using sessions, and on the client if you're using cookies. I can't think of any good reason to use cookies instead of sessions, except if you want data to persist between sessions, but even then it's perhaps better to store it in a DB, and retrieve it based on a username or id.

GET and POST

You can add the variable in the link to the next page:

<a href="page2.php?varname=<?php echo $var_value ?>">Page2</a>

This will create a GET variable.

Another way is to include a hidden field in a form that submits to page two:

<form method="get" action="page2.php">
    <input type="hidden" name="varname" value="var_value">
    <input type="submit">
</form>

And then on page two:

//Using GET
$var_value = $_GET['varname'];

//Using POST
$var_value = $_POST['varname'];

//Using GET, POST or COOKIE.
$var_value = $_REQUEST['varname'];

Just change the method for the form to post if you want to do it via post. Both are equally insecure, although GET is easier to hack.

The fact that each new request is, except for session data, a totally new instance of the script caught me when I first started coding in PHP. Once you get used to it, it's quite simple though.

jQuery.ajax handling continue responses: "success:" vs ".done"?

success has been the traditional name of the success callback in jQuery, defined as an option in the ajax call. However, since the implementation of $.Deferreds and more sophisticated callbacks, done is the preferred way to implement success callbacks, as it can be called on any deferred.

For example, success:

$.ajax({
  url: '/',
  success: function(data) {}
});

For example, done:

$.ajax({url: '/'}).done(function(data) {});

The nice thing about done is that the return value of $.ajax is now a deferred promise that can be bound to anywhere else in your application. So let's say you want to make this ajax call from a few different places. Rather than passing in your success function as an option to the function that makes this ajax call, you can just have the function return $.ajax itself and bind your callbacks with done, fail, then, or whatever. Note that always is a callback that will run whether the request succeeds or fails. done will only be triggered on success.

For example:

function xhr_get(url) {

  return $.ajax({
    url: url,
    type: 'get',
    dataType: 'json',
    beforeSend: showLoadingImgFn
  })
  .always(function() {
    // remove loading image maybe
  })
  .fail(function() {
    // handle request failures
  });

}

xhr_get('/index').done(function(data) {
  // do stuff with index data
});

xhr_get('/id').done(function(data) {
  // do stuff with id data
});

An important benefit of this in terms of maintainability is that you've wrapped your ajax mechanism in an application-specific function. If you decide you need your $.ajax call to operate differently in the future, or you use a different ajax method, or you move away from jQuery, you only have to change the xhr_get definition (being sure to return a promise or at least a done method, in the case of the example above). All the other references throughout the app can remain the same.

There are many more (much cooler) things you can do with $.Deferred, one of which is to use pipe to trigger a failure on an error reported by the server, even when the $.ajax request itself succeeds. For example:

function xhr_get(url) {

  return $.ajax({
    url: url,
    type: 'get',
    dataType: 'json'
  })
  .pipe(function(data) {
    return data.responseCode != 200 ?
      $.Deferred().reject( data ) :
      data;
  })
  .fail(function(data) {
    if ( data.responseCode )
      console.log( data.responseCode );
  });
}

xhr_get('/index').done(function(data) {
  // will not run if json returned from ajax has responseCode other than 200
});

Read more about $.Deferred here: http://api.jquery.com/category/deferred-object/

NOTE: As of jQuery 1.8, pipe has been deprecated in favor of using then in exactly the same way.

Convert java.util.Date to java.time.LocalDate

What's wrong with this 1 simple line?

new LocalDateTime(new Date().getTime()).toLocalDate();

Scraping: SSL: CERTIFICATE_VERIFY_FAILED error for http://en.wikipedia.org

I could find this solution and is working fine:

cd /Applications/Python\ 3.7/
./Install\ Certificates.command

Output first 100 characters in a string

String formatting using % is a great way to handle this. Here are some examples.

The formatting code '%s' converts '12345' to a string, but it's already a string.

>>> '%s' % '12345'

'12345'

'%.3s' specifies to use only the first three characters.

>>> '%.3s' % '12345'

'123'

'%.7s' says to use the first seven characters, but there are only five. No problem.

>>> '%.7s' % '12345'

'12345'

'%7s' uses up to seven characters, filling missing characters with spaces on the left.

>>> '%7s' % '12345'

'  12345'

'%-7s' is the same thing, except filling missing characters on the right.

>>> '%-7s' % '12345'

'12345  '

'%5.3' says use the first three characters, but fill it with spaces on the left to total five characters.

>>> '%5.3s' % '12345'

'  123'

Same thing except filling on the right.

>>> '%-5.3s' % '12345'

'123  '

Can handle multiple arguments too!

>>> 'do u no %-4.3sda%3.2s wae' % ('12345', 6789)

'do u no 123 da 67 wae'

If you require even more flexibility, str.format() is available too. Here is documentation for both.

Convert a dataframe to a vector (by rows)

You can try this to get your combination:

as.numeric(rbind(test$x, test$y))

which will return:

26, 34, 21, 29, 20, 28

What is the default root pasword for MySQL 5.7

None of these answers worked for me on Ubuntu Server 18.04.1 and MySQL 5.7.23. I spent a bunch of time trying and failing at setting the password and auth plugin manually, finding the password in logs (it's not there), etc.

The solution is actually super easy:

sudo mysql_secure_installation

It's really important to do this with sudo. If you try without elevation, you'll be asked for the root password, which you obviously don't have.

How to find a number in a string using JavaScript?

You can also try this :

_x000D_

var string = "border-radius:10px 20px 30px 40px";_x000D_
var numbers = string.match(/\d+/g).map(Number);_x000D_
console.log(numbers)

_x000D_

How to keep the spaces at the end and/or at the beginning of a String?

This documentation suggests quoting will work:

<string name="my_str_spaces">" Before and after? "</string>

How to refer to Excel objects in Access VBA?

I dissent from both the answers. Don't create a reference at all, but use late binding:

  Dim objExcelApp As Object
  Dim wb As Object

  Sub Initialize()
    Set objExcelApp = CreateObject("Excel.Application")
  End Sub

  Sub ProcessDataWorkbook()
     Set wb = objExcelApp.Workbooks.Open("path to my workbook")
     Dim ws As Object
     Set ws = wb.Sheets(1)

     ws.Cells(1, 1).Value = "Hello"
     ws.Cells(1, 2).Value = "World"

     'Close the workbook
     wb.Close
     Set wb = Nothing
  End Sub

You will note that the only difference in the code above is that the variables are all declared as objects and you instantiate the Excel instance with CreateObject().

This code will run no matter what version of Excel is installed, while using a reference can easily cause your code to break if there's a different version of Excel installed, or if it's installed in a different location.

Also, the error handling could be added to the code above so that if the initial instantiation of the Excel instance fails (say, because Excel is not installed or not properly registered), your code can continue. With a reference set, your whole Access application will fail if Excel is not installed.

Change fill color on vector asset in Android Studio

Add this library to the Gradle to enable color vector drawable in old android Devices.

compile 'com.android.support:palette-v7:26.0.0-alpha1'

and re sync gradle. I think it will solve the problem.

Python/Json:Expecting property name enclosed in double quotes

import ast

inpt = {'http://example.org/about': {'http://purl.org/dc/terms/title':
                                     [{'type': 'literal', 'value': "Anna's Homepage"}]}}

json_data = ast.literal_eval(json.dumps(inpt))

print(json_data)

this will solve the problem.

Generic Interface

As an answer strictly in line with your question, I support cleytus's proposal.

You could also use a marker interface (with no method), say DistantCall, with several several sub-interfaces that have the precise signatures you want.

The general interface would serve to mark all of them, in case you want to write some generic code for all of them.
The number of specific interfaces can be reduced by using cleytus's generic signature.

Examples of 'reusable' interfaces:

    public interface DistantCall {
    }

    public interface TUDistantCall<T,U> extends DistantCall {
      T execute(U... us);
    }

    public interface UDistantCall<U> extends DistantCall {
      void execute(U... us);
    }

    public interface TDistantCall<T> extends DistantCall {
      T execute();
    }

    public interface TUVDistantCall<T, U, V> extends DistantCall {
      T execute(U u, V... vs);
    }
    ....

UPDATED in response to OP comment

I wasn't thinking of any instanceof in the calling. I was thinking your calling code knew what it was calling, and you just needed to assemble several distant call in a common interface for some generic code (for example, auditing all distant calls, for performance reasons). In your question, I have seen no mention that the calling code is generic :-(

If so, I suggest you have only one interface, only one signature. Having several would only bring more complexity, for nothing.

However, you need to ask yourself some broader questions :
how you will ensure that caller and callee do communicate correctly?

That could be a follow-up on this question, or a different question...

How can I remove a pytz timezone from a datetime object?

To remove a timezone (tzinfo) from a datetime object:

# dt_tz is a datetime.datetime object
dt = dt_tz.replace(tzinfo=None)

If you are using a library like arrow, then you can remove timezone by simply converting an arrow object to to a datetime object, then doing the same thing as the example above.

# <Arrow [2014-10-09T10:56:09.347444-07:00]>
arrowObj = arrow.get('2014-10-09T10:56:09.347444-07:00')

# datetime.datetime(2014, 10, 9, 10, 56, 9, 347444, tzinfo=tzoffset(None, -25200))
tmpDatetime = arrowObj.datetime

# datetime.datetime(2014, 10, 9, 10, 56, 9, 347444)
tmpDatetime = tmpDatetime.replace(tzinfo=None)

Why would you do this? One example is that mysql does not support timezones with its DATETIME type. So using ORM's like sqlalchemy will simply remove the timezone when you give it a datetime.datetime object to insert into the database. The solution is to convert your datetime.datetime object to UTC (so everything in your database is UTC since it can't specify timezone) then either insert it into the database (where the timezone is removed anyway) or remove it yourself. Also note that you cannot compare datetime.datetime objects where one is timezone aware and another is timezone naive.

##############################################################################
# MySQL example! where MySQL doesn't support timezones with its DATETIME type!
##############################################################################

arrowObj = arrow.get('2014-10-09T10:56:09.347444-07:00')

arrowDt = arrowObj.to("utc").datetime

# inserts datetime.datetime(2014, 10, 9, 17, 56, 9, 347444, tzinfo=tzutc())
insertIntoMysqlDatabase(arrowDt)

# returns datetime.datetime(2014, 10, 9, 17, 56, 9, 347444)
dbDatetimeNoTz = getFromMysqlDatabase()

# cannot compare timzeone aware and timezone naive
dbDatetimeNoTz == arrowDt # False, or TypeError on python versions before 3.3

# compare datetimes that are both aware or both naive work however
dbDatetimeNoTz == arrowDt.replace(tzinfo=None) # True

How can I switch to another branch in git?

I am using this to switch one branch to another anyone you can use it works for me like charm.

git switch [branchName] OR git checkout [branchName]

ex: git switch develop OR
git checkout develop

Use jQuery to scroll to the bottom of a div with lots of text

Here's one sample: http://jsfiddle.net/CUUfb/1/

writing to existing workbook using xlwt

You need xlutils.copy. Try something like this:

from xlutils.copy import copy
w = copy('book1.xls')
w.get_sheet(0).write(0,0,"foo")
w.save('book2.xls')

Keep in mind you can't overwrite cells by default as noted in this question.

how do I strip white space when grabbing text with jQuery?

str=str.replace(/^\s+|\s+$/g,'');

What is the difference between res.end() and res.send()?

res.send is used to send the response to the client where res.end is used to end the response you are sending.

res.send automatically call res.end So you don't have to call or mention it after res.send

Android Split string

You might also want to consider the Android specific TextUtils.split() method.

The difference between TextUtils.split() and String.split() is documented with TextUtils.split():

String.split() returns [''] when the string to be split is empty. This returns []. This does not remove any empty strings from the result.

I find this a more natural behavior. In essence TextUtils.split() is just a thin wrapper for String.split(), dealing specifically with the empty-string case. The code for the method is actually quite simple.

How do I remove accents from characters in a PHP string?

WordPress' implementation is definitly the safest for UTF8 strings. For Latin1 strings, a simple strtr does the job, but ensure you're saving your script in LATIN1 format, not UTF-8.

function is not defined error in Python

In python functions aren't accessible magically from everywhere (like they are in say, php). They have to be declared first. So this will work:

def pyth_test (x1, x2):
    print x1 + x2

pyth_test(1, 2)

But this won't:

pyth_test(1, 2)

def pyth_test (x1, x2):
    print x1 + x2

Initialize a vector array of strings

MSVC 2010 solution, since it doesn't support std::initializer_list<> for vectors but it does support std::end

const char *args[] = {"hello", "world!"};
std::vector<std::string> v(args, std::end(args));

How to upload files to server using JSP/Servlet?

Without component or external Library in Tomcat 6 o 7

Enabling Upload in the web.xml file:

http://joseluisbz.wordpress.com/2014/01/17/manually-installing-php-tomcat-and-httpd-lounge/#Enabling%20File%20Uploads.

<servlet>
    <servlet-name>jsp</servlet-name>
    <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
    <multipart-config>
      <max-file-size>3145728</max-file-size>
      <max-request-size>5242880</max-request-size>
    </multipart-config>
    <init-param>
        <param-name>fork</param-name>
        <param-value>false</param-value>
    </init-param>
    <init-param>
        <param-name>xpoweredBy</param-name>
        <param-value>false</param-value>
    </init-param>
    <load-on-startup>3</load-on-startup>
</servlet>

AS YOU CAN SEE:

    <multipart-config>
      <max-file-size>3145728</max-file-size>
      <max-request-size>5242880</max-request-size>
    </multipart-config>

Uploading Files using JSP. Files:

In the html file

<form method="post" enctype="multipart/form-data" name="Form" >

  <input type="file" name="fFoto" id="fFoto" value="" /></td>
  <input type="file" name="fResumen" id="fResumen" value=""/>

In the JSP File or Servlet

    InputStream isFoto = request.getPart("fFoto").getInputStream();
    InputStream isResu = request.getPart("fResumen").getInputStream();
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    byte buf[] = new byte[8192];
    int qt = 0;
    while ((qt = isResu.read(buf)) != -1) {
      baos.write(buf, 0, qt);
    }
    String sResumen = baos.toString();

Edit your code to servlet requirements, like max-file-size, max-request-size and other options that you can to set...

Static linking vs dynamic linking

On Unix-like systems, dynamic linking can make life difficult for 'root' to use an application with the shared libraries installed in out-of-the-way locations. This is because the dynamic linker generally won't pay attention to LD_LIBRARY_PATH or its equivalent for processes with root privileges. Sometimes, then, static linking saves the day.

Alternatively, the installation process has to locate the libraries, but that can make it difficult for multiple versions of the software to coexist on the machine.

Converting from Integer, to BigInteger

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

E.g.,

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

Making a String first is unnecessary and undesired.

An existing connection was forcibly closed by the remote host - WCF

In my case it was also with serialization. I need to add [KnownType(typeof(...)] for all the classes that could appear in the serialization.

Why are Python lambdas useful?

lambdas are extremely useful in GUI programming. For example, lets say you're creating a group of buttons and you want to use a single paramaterized callback rather than a unique callback per button. Lambda lets you accomplish that with ease:

for value in ["one","two","three"]:
    b = tk.Button(label=value, command=lambda arg=value: my_callback(arg))
    b.pack()

(Note: although this question is specifically asking about lambda, you can also use functools.partial to get the same type of result)

The alternative is to create a separate callback for each button which can lead to duplicated code.

How to upload & Save Files with Desired name

Just get the file extention then assign the file a new name with uniqid and pass the new name to the move_upload_file method. For example:

if(isset($_POST['submit'])){
  $total = count($_FILES['files']['tmp_name']);
  for($i=0;$i<$total;$i++){
    $fileName = $_FILES['files']['name'][$i];
    $ext = pathinfo($fileName, PATHINFO_EXTENSION);
    $newFileName = uniqid();
    $fileDest = 'filesUploaded/'.$newFileName.'.'.$ext;
    if($ext === 'pdf' || 'jpeg' || 'JPG'){
        move_uploaded_file($_FILES['files']['tmp_name'][$i], $fileDest);
        $fileUpload = $newFileName.'.'.$ext[$i].',<br>';
    }else{
      echo 'Pdfs and jpegs only please';
    }
  }
}

Finding duplicate integers in an array and display how many times they occurred

Use Group by:

int[] values = new []{1,2,3,4,5,4,4,3};

var groups = values.GroupBy(v => v);
foreach(var group in groups)
    Console.WriteLine("Value {0} has {1} items", group.Key, group.Count());

Uploading a file in Rails

Update 2018

While everything written below still holds true, Rails 5.2 now includes active_storage, which allows stuff like uploading directly to S3 (or other cloud storage services), image transformations, etc. You should check out the rails guide and decide for yourself what fits your needs.

While there are plenty of gems that solve file uploading pretty nicely (see https://www.ruby-toolbox.com/categories/rails_file_uploads for a list), rails has built-in helpers which make it easy to roll your own solution.

Use the file_field-form helper in your form, and rails handles the uploading for you:

<%= form_for @person do |f| %>
  <%= f.file_field :picture %>
<% end %>

You will have access in the controller to the uploaded file as follows:

uploaded_io = params[:person][:picture]
File.open(Rails.root.join('public', 'uploads', uploaded_io.original_filename), 'wb') do |file|
  file.write(uploaded_io.read)
end

It depends on the complexity of what you want to achieve, but this is totally sufficient for easy file uploading/downloading tasks. This example is taken from the rails guides, you can go there for further information: http://guides.rubyonrails.org/form_helpers.html#uploading-files

Where does R store packages?

Thanks for the direction from the above two answerers. James Thompson's suggestion worked best for Windows users.

Go to where your R program is installed. This is referred to as R_Home in the literature. Once you find it, go to the /etc subdirectory.
```
C:\R\R-2.10.1\etc
```
Select the file in this folder named Rprofile.site. I open it with VIM. You will find this is a bare-bones file with less than 20 lines of code. I inserted the following inside the code:
```
# my custom library path
.libPaths("C:/R/library")
```
(The comment added to keep track of what I did to the file.)
In R, typing the .libPaths() function yields the first target at C:/R/Library

NOTE: there is likely more than one way to achieve this, but other methods I tried didn't work for some reason.

Key Shortcut for Eclipse Imports

You also can enable this import as automatic operation. In the properties dialog of your Java projects, enable organize imports via Java Editor - Save Action. After saving your Java files, IDE will do organizing imports, formatting code and so on for you.

Eclipse Bug: Unhandled event loop exception No more handles

As suggested by Nineroad Installing WindowBuilder as the default editor for files with a *.java extention fixed this issue for me.

In Eclipse, navigate to Help > Install New Software

Add http://archive.eclipse.org/windowbuilder/WB/release/R201309271200/4.3 to the "Work with" path, select all components suggested, and install WindowBuilder.

Once complete, Eclipse will request restart. Once restarted, within Eclipse navigate to Window > Preferences. In The Preferences dialogue-box navigate to General > Editor > File Associations. Under "File Associations" list, be sure to select *.java file types. The bottom window (labeled "Associated Editors") should have WindowBuilder as an option. Select WindowBuilder and click "Default" to the right, to set WindowBuilder as your default *.java file editor.

This fixed the SWT error for me.

Note: Eclipse Version: Kepler Service Release 2 Windows 7 64-bit

Does a "Find in project..." feature exist in Eclipse IDE?

There is very nice tool "Eclipse Quicksearch" available. Checkout SpringSource Update Site for Eclipse i.e: http://dist.springsource.com/release/TOOLS/update/e4.6/ (you can try other versions replacing last part of URL with i.e. e4.4 or e4.5)

It works well with Neon Release (4.6.0). It gives you nice incremental text search with source file preview. I had no issues with it so far.

Usage: Alt + s "Quick Search Command" opens "Quick Text Search" dialog. You can select whether search should be case sensitive or not. Really good tool.

Jenkins Slave port number for firewall

I have a similar scenario, and had no problem connecting after setting the JNLP port as you describe, and adding a single firewall rule allowing a connection on the server using that port. Granted it is a randomly selected client port going to a known server port (a host:ANY -> server:1 rule is needed).

From my reading of the source code, I don't see a way to set the local port to use when making the request from the slave. It's unfortunate, it would be a nice feature to have.

Alternatives:

Use a simple proxy on your client that listens on port N and then does forward all data to the actual Jenkins server on the remote host using a constant local port. Connect your slave to this local proxy instead of the real Jenkins server.

Create a custom Jenkins slave build that allows an option to specify the local port to use.

Remember also if you are using HTTPS via a self-signed certificate, you must alter the configuration jenkins-slave.xml file on the slave to specify the -noCertificateCheck option on the command line.

How to set $_GET variable

If you want to fake a $_GET (or a $_POST) when including a file, you can use it like you would use any other var, like that:

$_GET['key'] = 'any get value you want';
include('your_other_file.php');

Select multiple rows with the same value(s)

Assuming that you want all rows for which there is another row with the exact same Chromosome and Locus:

You can achieve this by joining the table to itself, but only returning the columns from one "side" of the join.

The trick is to set the join condition to "the same locus and chromosome":

select left.*
from Genes left
inner join Genes right
on left.Locus = right.Locus and 
  left.Chromosome = right.Chromosome and left.ID != right.ID

You can also easily extend this by adding a filter in a where-clause.

How to move a file?

This is what I'm using at the moment:

import os, shutil
path = "/volume1/Users/Transfer/"
moveto = "/volume1/Users/Drive_Transfer/"
files = os.listdir(path)
files.sort()
for f in files:
    src = path+f
    dst = moveto+f
    shutil.move(src,dst)

Now fully functional. Hope this helps you.

Edit:

I've turned this into a function, that accepts a source and destination directory, making the destination folder if it doesn't exist, and moves the files. Also allows for filtering of the src files, for example if you only want to move images, then you use the pattern '*.jpg', by default, it moves everything in the directory

import os, shutil, pathlib, fnmatch

def move_dir(src: str, dst: str, pattern: str = '*'):
    if not os.path.isdir(dst):
        pathlib.Path(dst).mkdir(parents=True, exist_ok=True)
    for f in fnmatch.filter(os.listdir(src), pattern):
        shutil.move(os.path.join(src, f), os.path.join(dst, f))

how to setup ssh keys for jenkins to publish via ssh

For Windows:

Install the necessary plugins for the repository (ex: GitHub install GitHub and GitHub Authentication plugins) in Jenkins.
You can generate a key with Putty key generator, or by running the following command in git bash: $ ssh-keygen -t rsa -b 4096 -C [email protected]
Private key must be OpenSSH. You can convert your private key to OpenSSH in putty key generator
SSH keys come in pairs, public and private. Public keys are inserted in the repository to be cloned. Private keys are saved as credentials in Jenkins
You need to copy the SSH URL not the HTTPS to work with ssh keys.

How to call a SOAP web service on Android

SOAP is an ill-suited technology for use on Android (or mobile devices in general) because of the processing/parsing overhead that's required. A REST services is a lighter weight solution and that's what I would suggest. Android comes with a SAX parser, and it's fairly trivial to use. If you are absolutely required to handle/parse SOAP on a mobile device then I feel sorry for you, the best advice I can offer is just not to use SOAP.

VBA EXCEL Multiple Nested FOR Loops that Set two variable for expression

I can't get to your google docs file at the moment but there are some issues with your code that I will try to address while answering

Sub stituterangersNEW()
Dim t As Range
Dim x As Range
Dim dify As Boolean
Dim difx As Boolean
Dim time2 As Date
Dim time1 As Date

    'You said time1 doesn't change, so I left it in a singe cell.
    'If that is not correct, you will have to play with this some more.
    time1 = Range("A6").Value

    'Looping through each of our output cells.
    For Each t In Range("B7:E9") 'Change these to match your real ranges.

        'Looping through each departure date/time.
        '(Only one row in your example. This can be adjusted if needed.)
        For Each x In Range("B2:E2") 'Change these to match your real ranges.
            'Check to see if our dep time corresponds to
            'the matching column in our output
            If t.Column = x.Column Then
                'If it does, then check to see what our time value is
                If x > 0 Then
                    time2 = x.Value
                    'Apply the change to the output cell.
                    t.Value = time1 - time2
                    'Exit out of this loop and move to the next output cell.
                    Exit For
                End If
            End If
            'If the columns don't match, or the x value is not a time
            'then we'll move to the next dep time (x)
        Next x
    Next t

End Sub

EDIT

I changed you worksheet to play with (see above for the new Sub). This probably does not suite your needs directly, but hopefully it will demonstrate the conept behind what I think you want to do. Please keep in mind that this code does not follow all the coding best preactices I would recommend (e.g. validating the time is actually a TIME and not some random other data type).

     A                      B                   C                   D                  E
1    LOAD_NUMBER            1                   2                   3                  4
2    DEPARTURE_TIME_DATE    11/12/2011 19:30    11/12/2011 19:30    11/12/2011 19:30    11/12/2011 20:00                
4    Dry_Refrig 7585.1  0   10099.8 16700
6    1/4/2012 19:30

Using the sub I got this output:

    A           B             C             D             E
7   Friday      1272:00:00    1272:00:00    1272:00:00    1271:30:00
8   Saturday    1272:00:00    1272:00:00    1272:00:00    1271:30:00
9   Thursday    1272:00:00    1272:00:00    1272:00:00    1271:30:00

SQL Server: how to add new identity column and populate column with ids?

Check whether a path is valid in Python without creating a file at the path's target

With Python 3, how about:

try:
    with open(filename, 'x') as tempfile: # OSError if file exists or is invalid
        pass
except OSError:
    # handle error here

With the 'x' option we also don't have to worry about race conditions. See documentation here.

Now, this WILL create a very shortlived temporary file if it does not exist already - unless the name is invalid. If you can live with that, it simplifies things a lot.

Is there a difference between "==" and "is"?

Is there a difference between == and is in Python?

Yes, they have a very important difference.

==: check for equality - the semantics are that equivalent objects (that aren't necessarily the same object) will test as equal. As the documentation says:

The operators <, >, ==, >=, <=, and != compare the values of two objects.

is: check for identity - the semantics are that the object (as held in memory) is the object. Again, the documentation says:

The operators is and is not test for object identity: x is y is true if and only if x and y are the same object. Object identity is determined using the id() function. x is not y yields the inverse truth value.

Thus, the check for identity is the same as checking for the equality of the IDs of the objects. That is,

a is b

is the same as:

id(a) == id(b)

where id is the builtin function that returns an integer that "is guaranteed to be unique among simultaneously existing objects" (see help(id)) and where a and b are any arbitrary objects.

Other Usage Directions

You should use these comparisons for their semantics. Use is to check identity and == to check equality.

So in general, we use is to check for identity. This is usually useful when we are checking for an object that should only exist once in memory, referred to as a "singleton" in the documentation.

Use cases for is include:

None
enum values (when using Enums from the enum module)
usually modules
usually class objects resulting from class definitions
usually function objects resulting from function definitions
anything else that should only exist once in memory (all singletons, generally)
a specific object that you want by identity

Usual use cases for == include:

numbers, including integers
strings
lists
sets
dictionaries
custom mutable objects
other builtin immutable objects, in most cases

The general use case, again, for ==, is the object you want may not be the same object, instead it may be an equivalent one

PEP 8 directions

PEP 8, the official Python style guide for the standard library also mentions two use-cases for is:

Comparisons to singletons like None should always be done with is or is not, never the equality operators.

Also, beware of writing if x when you really mean if x is not None -- e.g. when testing whether a variable or argument that defaults to None was set to some other value. The other value might have a type (such as a container) that could be false in a boolean context!

Inferring equality from identity

If is is true, equality can usually be inferred - logically, if an object is itself, then it should test as equivalent to itself.

In most cases this logic is true, but it relies on the implementation of the __eq__ special method. As the docs say,

The default behavior for equality comparison (== and !=) is based on the identity of the objects. Hence, equality comparison of instances with the same identity results in equality, and equality comparison of instances with different identities results in inequality. A motivation for this default behavior is the desire that all objects should be reflexive (i.e. x is y implies x == y).

and in the interests of consistency, recommends:

Equality comparison should be reflexive. In other words, identical objects should compare equal:

x is y implies x == y

We can see that this is the default behavior for custom objects:

>>> class Object(object): pass
>>> obj = Object()
>>> obj2 = Object()
>>> obj == obj, obj is obj
(True, True)
>>> obj == obj2, obj is obj2
(False, False)

The contrapositive is also usually true - if somethings test as not equal, you can usually infer that they are not the same object.

Since tests for equality can be customized, this inference does not always hold true for all types.

An exception

A notable exception is nan - it always tests as not equal to itself:

>>> nan = float('nan')
>>> nan
nan
>>> nan is nan
True
>>> nan == nan           # !!!!!
False

Checking for identity can be much a much quicker check than checking for equality (which might require recursively checking members).

But it cannot be substituted for equality where you may find more than one object as equivalent.

Note that comparing equality of lists and tuples will assume that identity of objects are equal (because this is a fast check). This can create contradictions if the logic is inconsistent - as it is for nan:

>>> [nan] == [nan]
True
>>> (nan,) == (nan,)
True

A Cautionary Tale:

The question is attempting to use is to compare integers. You shouldn't assume that an instance of an integer is the same instance as one obtained by another reference. This story explains why.

A commenter had code that relied on the fact that small integers (-5 to 256 inclusive) are singletons in Python, instead of checking for equality.

Wow, this can lead to some insidious bugs. I had some code that checked if a is b, which worked as I wanted because a and b are typically small numbers. The bug only happened today, after six months in production, because a and b were finally large enough to not be cached. – gwg

It worked in development. It may have passed some unittests.

And it worked in production - until the code checked for an integer larger than 256, at which point it failed in production.

This is a production failure that could have been caught in code review or possibly with a style-checker.

Let me emphasize: do not use is to compare integers.

How to find out client ID of component for ajax update/render? Cannot find component with expression "foo" referenced from "bar"

first of all: as far as i know placing dialog inside a tabview is a bad practice... you better take it out...

and now to your question:

sorry, took me some time to get what exactly you wanted to implement,

did at my web app myself just now, and it works

as I sayed before place the p:dialog out side the `p:tabView ,

leave the p:dialog as you initially suggested :

<p:dialog modal="true" widgetVar="dlg">
    <h:panelGrid id="display">
        <h:outputText value="Name:" />
        <h:outputText value="#{instrumentBean.selectedInstrument.name}" />
    </h:panelGrid>
</p:dialog>

and the p:commandlink should look like this (all i did is to change the update attribute)

<p:commandLink update="display" oncomplete="dlg.show()">
    <f:setPropertyActionListener value="#{lndInstrument}" 
        target="#{instrumentBean.selectedInstrument}" />
    <h:outputText value="#{lndInstrument.name}" />
</p:commandLink>

the same works in my web app, and if it does not work for you , then i guess there is something wrong in your java bean code...

Regex allow a string to only contain numbers 0 - 9 and limit length to 45

A combination of both attempts is probably what you need:

^[0-9]{1,45}$

Proper way to concatenate variable strings

Since strings are lists of characters in Python, we can concatenate strings the same way we concatenate lists (with the + sign):

{{ var1 + '-' + var2 + '-' + var3 }}

If you want to pipe the resulting string to some filter, make sure you enclose the bits in parentheses:

e.g. To concatenate our 3 vars, and get a sha512 hash:

{{ (var1 + var2 + var3) | hash('sha512') }}

Note: this works on Ansible 2.3. I haven't tested it on earlier versions.

Resolve promises one after another (i.e. in sequence)?

I created this simple method on the Promise object:

Create and add a Promise.sequence method to the Promise object

Promise.sequence = function (chain) {
    var results = [];
    var entries = chain;
    if (entries.entries) entries = entries.entries();
    return new Promise(function (yes, no) {
        var next = function () {
            var entry = entries.next();
            if(entry.done) yes(results);
            else {
                results.push(entry.value[1]().then(next, function() { no(results); } ));
            }
        };
        next();
    });
};

Usage:

var todo = [];

todo.push(firstPromise);
if (someCriterium) todo.push(optionalPromise);
todo.push(lastPromise);

// Invoking them
Promise.sequence(todo)
    .then(function(results) {}, function(results) {});

The best thing about this extension to the Promise object, is that it is consistent with the style of promises. Promise.all and Promise.sequence is invoked the same way, but have different semantics.

Caution

Sequential running of promises is not usually a very good way to use promises. It's usually better to use Promise.all, and let the browser run the code as fast as possible. However, there are real use cases for it - for example when writing a mobile app using javascript.

Programs & Examples On #Humanize

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