Programs & Examples On #Proxy pattern

NameError: global name 'unicode' is not defined - in Python 3

If you need to have the script keep working on python2 and 3 as I did, this might help someone

import sys
if sys.version_info[0] >= 3:
    unicode = str

and can then just do for example

foo = unicode.lower(foo)

Google map V3 Set Center to specific Marker

geocoder.geocode( { 'address': address}, function(results, status) {
    if (status == google.maps.GeocoderStatus.OK) {
      var marker = new google.maps.Marker({
          map: map,
          position: results[0].geometry.location
    } else {
      alert('Geocode was not successful for the following reason: ' + status);

SQL Stored Procedure: If variable is not null, update statement

Yet another approach is ISNULL().

    [ABC]  = ISNULL(@ABC, [ABC]),

The difference between ISNULL and COALESCE is the return type. COALESCE can also take more than 2 arguments, and use the first that is not null. I.e.

select COALESCE(null, null, 1, 'two') --returns 1
select COALESCE(null, null, null, 'two') --returns 'two'

Change width of select tag in Twitter Bootstrap

This works for me to reduce select tag's width;

<select id ="Select1" class="input-small">

You can use any one of these classes;






Table with 100% width with equal size columns

<table width="400px">
  <td width="100px"></td>
  <td width="100px"></td>
  <td width="100px"></td>
  <td width="100px"></td>

For variable number of columns use %

<table width="100%">
  <td width="(100/x)%"></td>

where 'x' is number of columns

Can Selenium interact with an existing browser session?

I got a solution in python, I modified the webdriver class bassed on PersistenBrowser class that I found.

replace the webdriver module /usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/

Ej. to use:

from selenium.webdriver.common.desired_capabilities import DesiredCapabilities

runDriver = sys.argv[1]
sessionId = sys.argv[2]

def setBrowser():
    if eval(runDriver):
        webdriver = w.Remote(command_executor='http://localhost:4444/wd/hub',
        webdriver = w.Remote(command_executor='http://localhost:4444/wd/hub',

    url = webdriver.command_executor._url
    session_id = webdriver.session_id
    print url
    print session_id
    return webdriver

How to unapply a migration in ASP.NET Core with EF Core

To completely remove all migrations and start all over again, do the following:

dotnet ef database update 0
dotnet ef migrations remove

Excel VBA Password via Hex Editor

I have your answer, as I just had the same problem today:

Someone made a working vba code that changes the vba protection password to "macro", for all excel files, including .xlsm (2007+ versions). You can see how it works by browsing his code.

This is the guy's blog: Here's the file that does the work:

Pasted from a previous post from his blog:

For Excel 2007/2010 (.xlsm) files do following steps:

  1. Create a new .xlsm file.
  2. In the VBA part, set a simple password (for instance 'macro').
  3. Save the file and exit.
  4. Change file extention to '.zip', open it by any archiver program.
  5. Find the file: 'vbaProject.bin' (in 'xl' folder).
  6. Extract it from archive.
  7. Open the file you just extracted with a hex editor.
  8. Find and copy the value from parameter DPB (value in quotation mark), example: DPB="282A84CBA1CBA1345FCCB154E20721DE77F7D2378D0EAC90427A22021A46E9CE6F17188A". (This value generated for 'macro' password. You can use this DPB value to skip steps 1-8)

  9. Do steps 4-7 for file with unknown password (file you want to unlock).

  10. Change DBP value in this file on value that you have copied in step 8.

    If copied value is shorter than in encrypted file you should populate missing characters with 0 (zero). If value is longer - that is not a problem (paste it as is).

  11. Save the 'vbaProject.bin' file and exit from hex editor.

  12. Replace existing 'vbaProject.bin' file with modified one.
  13. Change extention from '.zip' back to '.xlsm'
  14. Now, open the excel file you need to see the VBA code in. The password for the VBA code will simply be macro (as in the example I'm showing here).

Check if a Bash array contains a value

I came up with this one, which turns out to work only in zsh, but I think the general approach is nice.

arr=( "hello world" "find me" "what?" )
if [[ "${arr[@]/#%find me/}" != "${arr[@]}" ]]; then
    echo "found!"
    echo "not found!"

You take out your pattern from each element only if it starts ${arr[@]/#pattern/} or ends ${arr[@]/%pattern/} with it. These two substitutions work in bash, but both at the same time ${arr[@]/#%pattern/} only works in zsh.

If the modified array is equal to the original, then it doesn't contain the element.


This one works in bash:

 function contains () {
        local arr=(${@:2})
        local el=$1
        local marr=(${arr[@]/#$el/})
        [[ "${#arr[@]}" != "${#marr[@]}" ]]

After the substitution it compares the length of both arrays. Obly if the array contains the element the substitution will completely delete it, and the count will differ.

Android SQLite: Update Statement

It's all in the tutorial how to do that:

    ContentValues args = new ContentValues();
    args.put(columnName, newValue);
    db.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null);

Use ContentValues to set the updated columns and than the update() method in which you have to specifiy, the table and a criteria to only update the rows you want to update.

Initializing default values in a struct

An explicit default initialization can help:

struct foo {
    bool a {};
    bool b {};
    bool c {};
 } bar;

Behavior bool a {} is same as bool b = bool(); and return false.

How to set delay in vbscript

As stated in this answer:

Application.Wait (Now + TimeValue("0:00:01"))

will wait for 1 second

How do I refresh the page in ASP.NET? (Let it reload itself by code)

Try this:


How can I convert a char to int in Java?

You can use static methods from Character class to get Numeric value from char.

char x = '9';

if (Character.isDigit(x)) { // Determines if the specified character is a digit.
    int y = Character.getNumericValue(x); //Returns the int value that the 
                                          //specified Unicode character represents.

"inappropriate ioctl for device"

I just fixed this perl bug. See

When we push the buffer layer to PerlIO and do a failing isatty() check which obviously fails on all normal files, ignore the wrong errno ENOTTY.

How do I check if a given Python string is a substring of another one?

Try using in like this:

>>> x = 'hello'
>>> y = 'll'
>>> y in x

How to return multiple objects from a Java method?

As I see it there are really three choices here and the solution depends on the context. You can choose to implement the construction of the name in the method that produces the list. This is the choice you've chosen, but I don't think it is the best one. You are creating a coupling in the producer method to the consuming method that doesn't need to exist. Other callers may not need the extra information and you would be calculating extra information for these callers.

Alternatively, you could have the calling method calculate the name. If there is only one caller that needs this information, you can stop there. You have no extra dependencies and while there is a little extra calculation involved, you've avoided making your construction method too specific. This is a good trade-off.

Lastly, you could have the list itself be responsible for creating the name. This is the route I would go if the calculation needs to be done by more than one caller. I think this puts the responsibility for the creation of the names with the class that is most closely related to the objects themselves.

In the latter case, my solution would be to create a specialized List class that returns a comma-separated string of the names of objects that it contains. Make the class smart enough that it constructs the name string on the fly as objects are added and removed from it. Then return an instance of this list and call the name generation method as needed. Although it may be almost as efficient (and simpler) to simply delay calculation of the names until the first time the method is called and store it then (lazy loading). If you add/remove an object, you need only remove the calculated value and have it get recalculated on the next call.

How can I change NULL to 0 when getting a single value from a SQL function?



SELECT NVL(SUM(Price), 0) AS TotalPrice 
FROM Inventory
WHERE (DateAdded BETWEEN @StartDate AND @EndDate)

This SQL statement would return 0 if the SUM(Price) returned a null value. Otherwise, it would return the SUM(Price) value.

How do I keep the screen on in my App?

You can simply use setKeepScreenOn() from the View class.

How to enable remote access of mysql in centos?

Bind-address XXX.XX.XX.XXX in /etc/my.cnf

comment line:




after edit hit service mysqld restart

login into mysql and hit this query:

GRANT ALL PRIVILEGES ON dbname.* TO 'username'@'%' IDENTIFIED BY 'password';


add firewall rule:

iptables -I INPUT -i eth0 -p tcp --destination-port 3306 -j ACCEPT

Word wrapping in phpstorm

In addition to Settings -> Editor -> Use soft wraps in editor I recommend Use soft wraps in console and Use custom soft wraps indent with a setting of 4 to make the wraps indented to match the line they started on.

What is the Python equivalent of static variables inside a function?

A global declaration provides this functionality. In the example below (python 3.5 or greater to use the "f"), the counter variable is defined outside of the function. Defining it as global in the function signifies that the "global" version outside of the function should be made available to the function. So each time the function runs, it modifies the value outside the function, preserving it beyond the function.

counter = 0

def foo():
    global counter
    counter += 1
    print("counter is {}".format(counter))

foo() #output: "counter is 1"
foo() #output: "counter is 2"
foo() #output: "counter is 3"

Select distinct values from a large DataTable column

dt- your data table name

ColumnName- your columnname i.e id

DataView view = new DataView(dt);
DataTable distinctValues = new DataTable();
distinctValues = view.ToTable(true, ColumnName);

How can I pause setInterval() functions?

Why not use a simpler approach? Add a class!

Simply add a class that tells the interval not to do anything. For example: on hover.

var i = 0;_x000D_
this.setInterval(function() {_x000D_
  if(!$('#counter').hasClass('pauseInterval')) { //only run if it hasn't got this class 'pauseInterval'_x000D_
    $('#counter').html(i++); //just for explaining and showing_x000D_
  } else {_x000D_
    console.log('Stopped counting');_x000D_
}, 500);_x000D_
/* In this example, I'm adding a class on mouseover and remove it again on mouseleave. You can of course do pretty much whatever you like */_x000D_
$('#counter').hover(function() { //mouse enter_x000D_
  },function() { //mouse leave_x000D_
/* Other example */_x000D_
$('#pauseInterval').click(function() {_x000D_
body {_x000D_
  background-color: #eee;_x000D_
  font-family: Calibri, Arial, sans-serif;_x000D_
#counter {_x000D_
  width: 50%;_x000D_
  background: #ddd;_x000D_
  border: 2px solid #009afd;_x000D_
  border-radius: 5px;_x000D_
  padding: 5px;_x000D_
  text-align: center;_x000D_
  transition: .3s;_x000D_
  margin: 0 auto;_x000D_
#counter.pauseInterval {_x000D_
  border-color: red;  _x000D_
<!-- you'll need jQuery for this. If you really want a vanilla version, ask -->_x000D_
<script src=""></script>_x000D_
<p id="counter">&nbsp;</p>_x000D_
<button id="pauseInterval">Pause</button></p>

I've been looking for this fast and easy approach for ages, so I'm posting several versions to introduce as many people to it as possible.

Page redirect after certain time PHP

Redirect PHP time programming:


Good Java graph algorithm library?

For visualization our group had some success with prefuse. We extended it to handle architectural floorplates and bubble diagraming, and it didn't complain too much. They have a new Flex toolkit out too called Flare that uses a very similar API.

UPDATE: I'd have to agree with the comment, we ended up writing a lot of custom functionality/working around prefuse limitations. I can't say that starting from scratch would have been better though as we were able to demonstrate progress from day 1 by using prefuse. On the other hand if we were doing a second implementation of the same stuff, I might skip prefuse since we'd understand the requirements a lot better.

Display SQL query results in php

You need to fetch the data from each row of the resultset obtained from the query. You can use mysql_fetch_array() for this.

// Process all rows
while($row = mysql_fetch_array($result)) {
    echo $row['column_name']; // Print a single column data
    echo print_r($row);       // Print the entire row data

Change your code to this :

$sql="SELECT * FROM  modul1open WHERE idM1O>=(SELECT FLOOR( MAX( idM1O ) * RAND( ) )  FROM  modul1open) 

$result = mysql_query($sql);
while($row = mysql_fetch_array($result)) {
    echo $row['fieldname']; 

How do I convert an Array to a List<object> in C#?

Use the constructor: new List<object>(myArray)

Is it possible to append to innerHTML without destroying descendants' event listeners?

I created my markup to insert as a string since it's less code and easier to read than working with the fancy dom stuff.

Then I made it innerHTML of a temporary element just so I could take the one and only child of that element and attach to the body.

var html = '<div>';
html += 'Hello div!';
html += '</div>';

var tempElement = document.createElement('div');
tempElement.innerHTML = html;

How do I call one constructor from another in Java?

When I need to call another constructor from inside the code (not on the first line), I usually use a helper method like this:

class MyClass {
   int field;

   MyClass() {
   MyClass(int value) {
      if (value<0) {
      else { 
   void init(int x) {
      field = x;

But most often I try to do it the other way around by calling the more complex constructors from the simpler ones on the first line, to the extent possible. For the above example

class MyClass {
   int field;

   MyClass(int value) {
      if (value<0)
         field = 0;
         field = value;
   MyClass() {

SQL Server convert string to datetime

For instance you can use

update tablename set datetimefield='19980223 14:23:05'
update tablename set datetimefield='02/23/1998 14:23:05'
update tablename set datetimefield='1998-12-23 14:23:05'
update tablename set datetimefield='23 February 1998 14:23:05'
update tablename set datetimefield='1998-02-23T14:23:05'

You need to be careful of day/month order since this will be language dependent when the year is not specified first. If you specify the year first then there is no problem; date order will always be year-month-day.

How do I capture SIGINT in Python?

thanks for existing answers, but added signal.getsignal()

import signal

# store default handler of signal.SIGINT
default_handler = signal.getsignal(signal.SIGINT)
catch_count = 0

def handler(signum, frame):
    global default_handler, catch_count
    catch_count += 1
    print ('wait:', catch_count)
    if catch_count > 3:
        # recover handler for signal.SIGINT
        signal.signal(signal.SIGINT, default_handler)
        print('expecting KeyboardInterrupt')

signal.signal(signal.SIGINT, handler)
print('Press Ctrl+c here')

while True:

Fetch API with Cookie

This works for me:

import Cookies from 'universal-cookie';
const cookies = new Cookies();

function headers(set_cookie=false) {
  let headers = {
    'Accept':       'application/json',
    'Content-Type': 'application/json',
    'X-CSRF-Token': $('meta[name="csrf-token"]').attr('content')
if (set_cookie) {
    headers['Authorization'] = "Bearer " + cookies.get('remember_user_token');
return headers;

Then build your call:

export function fetchTests(user_id) {
  return function (dispatch) {
   let data = {
    method:      'POST',
    credentials: 'same-origin',
    mode:        'same-origin',
    body:        JSON.stringify({
                     user_id: user_id
    headers:     headers(true)
   return fetch('/api/v1/tests/listing/', data)
      .then(response => response.json())
      .then(json => dispatch(receiveTests(json)));

How to change the status bar color in Android?

change the colorPrimaryDark to your desire color into the res/values/styles.xml file

        <color name="colorPrimary">#800000</color>
        <color name="colorPrimaryDark">#303F9F</color> //This Line
        <color name="colorAccent">#FF4081</color>
        <color name="red">#FF0000</color>
        <color name="white">#FFFFFF</color>
       <color name="cream">#fffdd0</color>
       <color name="burgundy">#800000</color>

Fill SVG path element with a background-image

You can do it by making the background into a pattern:

  <pattern id="img1" patternUnits="userSpaceOnUse" width="100" height="100">
    <image href="wall.jpg" x="0" y="0" width="100" height="100" />

Adjust the width and height according to your image, then reference it from the path like this:

<path d="M5,50
         l0,100 l100,0 l0,-100 l-100,0
         a50,50 0 1 1 -100,0 50,50 0 1 1 100,0
         l50,100 l-100,0 l50,-100
  fill="url(#img1)" />

Working example

What does "-ne" mean in bash?

"not equal" So in this case, $RESULT is tested to not be equal to zero.

However, the test is done numerically, not alphabetically:

n1 -ne n2     True if the integers n1 and n2 are not algebraically equal.

compared to:

s1 != s2      True if the strings s1 and s2 are not identical.

What REALLY happens when you don't free after malloc?

I typically free every allocated block once I'm sure that I'm done with it. Today, my program's entry point might be main(int argc, char *argv[]) , but tomorrow it might be foo_entry_point(char **args, struct foo *f) and typed as a function pointer.

So, if that happens, I now have a leak.

Regarding your second question, if my program took input like a=5, I would allocate space for a, or re-allocate the same space on a subsequent a="foo". This would remain allocated until:

  1. The user typed 'unset a'
  2. My cleanup function was entered, either servicing a signal or the user typed 'quit'

I can not think of any modern OS that does not reclaim memory after a process exits. Then again, free() is cheap, why not clean up? As others have said, tools like valgrind are great for spotting leaks that you really do need to worry about. Even though the blocks you example would be labeled as 'still reachable' , its just extra noise in the output when you're trying to ensure you have no leaks.

Another myth is "If its in main(), I don't have to free it", this is incorrect. Consider the following:

char *t;

for (i=0; i < 255; i++) {
    t = strdup(foo->name);

If that came prior to forking / daemonizing (and in theory running forever), your program has just leaked an undetermined size of t 255 times.

A good, well written program should always clean up after itself. Free all memory, flush all files, close all descriptors, unlink all temporary files, etc. This cleanup function should be reached upon normal termination, or upon receiving various kinds of fatal signals, unless you want to leave some files laying around so you can detect a crash and resume.

Really, be kind to the poor soul who has to maintain your stuff when you move on to other things .. hand it to them 'valgrind clean' :)

How can I make a jQuery UI 'draggable()' div draggable for touchscreen?

jQuery ui 1.9 is going to take care of this for you. Heres a demo of the pre:

Just grab the jquery.mouse.ui.js out, stick it under the jQuery ui file you're loading, and that's all you should have to do! Works for sortable as well.

This code is working great for me, but if your getting errors, an updated version of jquery.mouse.ui.js can be found here:

Jquery-ui sortable doesn't work on touch devices based on Android or IOS

Fatal error: Class 'PHPMailer' not found

all answers are outdated now. Most current version (as of Feb 2018) does not have autoload anymore, and PHPMailer should be initialized as follows:



    $mail = new PHPMailer\PHPMailer\PHPMailer();
    $mail->IsSMTP(); // enable SMTP

    $mail->SMTPDebug = 1; // debugging: 1 = errors and messages, 2 = messages only
    $mail->SMTPAuth = true; // authentication enabled
    $mail->SMTPSecure = 'ssl'; // secure transfer enabled REQUIRED for Gmail
    $mail->Host = "";
    $mail->Port = 465; // or 587
    $mail->Username = "xxxxxx";
    $mail->Password = "xxxx";
    $mail->SetFrom("[email protected]");
    $mail->Subject = "Test";
    $mail->Body = "hello";
    $mail->AddAddress("[email protected]");

     if(!$mail->Send()) {
        echo "Mailer Error: " . $mail->ErrorInfo;
     } else {
        echo "Message has been sent";

How to change default JRE for all Eclipse workspaces?

I ran into a similar issue where eclipse was not using my current %JAVA_HOME% that was on the path and was instead using an older version. The documentation points out that if no -vm is specified in the ini file, eclipse will search for a shared library jvm.dll This appears in the registry under the key HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\JavaSoft\Java Runtime Environment that gets installed when using the windows java installer (key might be a bit different based on 64-bit vs 32-bit, but search for jvm.dll). Because it was finding this shared library on my path before the %JAVA_HOME%/bin, it was using the old version.

Like others have stated, the easiest way to deal with this is to specify the specific vm you want to use in the eclipse.ini file. I'm writing this because I couldn't figure out how it was still using the old version when it wasn't specified anywhere on the path or eclipse.ini file.

See link to doc below:

Finding a VM and using the JNI Invocation API

The Eclipse launcher is capable of loading the Java VM in the eclipse process using the Java Native Interface Invocation API. The launcher is still capable of starting the Java VM in a separate process the same as previous version of Eclipse did. Which method is used depends on how the VM was found.

No -vm specified

When no -vm is specified, the launcher looks for a virtual machine first in a jre directory in the root of eclipse and then on the search path. If java is found in either location, then the launcher looks for a jvm shared library (jvm.dll on Windows, on *nix platforms) relative to that java executable.

  • If a jvm shared library is found the launcher loads it and uses the JNI invocation API to start the vm.
  • If no jvm shared library is found, the launcher executes the java launcher to start the vm in a new process.

-vm specified on the command line or in eclipse.ini

Eclipse can be started with "-vm " to indicate a virtual machine to use. There are several possibilities for the value of :

  • directory: is a directory. We look in that directory for:
    • (1) a java launcher or
    • (2) the jvm shared library.

If we find the jvm shared library, we use JNI invocation. If we find a launcher, we attempt to find a jvm library in known locations relative to the launcher. If we find one, we use JNI invocation. If no jvm library is found, we exec java in a new process.

  • java.exe/javaw.exe: is a path to a java launcher. We exec that java launcher to start the vm in a new process.

  • jvm dll or so: is a path to a jvm shared library. We attempt to load that library and use the JNI Invocation API to start the vm in the current process.

How to extract .war files in java? ZIP vs JAR

If you look at the JarFile API you'll see that it's a subclass of the ZipFile class.

The jar-specific classes mostly just add jar-specific functionality, like direct support for manifest file attributes and so on.

It's OOP "in action"; since jar files are zip files, the jar classes can use zip functionality and provide additional utility.

How to get last inserted id?

There are all sorts of ways to get the Last Inserted ID but the easiest way I have found is by simply retrieving it from the TableAdapter in the DataSet like so:

<Your DataTable Class> tblData = new <Your DataTable Class>();
<Your Table Adapter Class> tblAdpt = new <Your Table Adapter Class>();

/*** Initialize and update Table Data Here ***/

/*** Make sure to call the EndEdit() method ***/
/*** of any Binding Sources before update ***/

//Update the Dataset

//Get the New ID from the Table Adapter
long newID = tblAdpt.Adapter.InsertCommand.LastInsertedId;

Hope this Helps ...

Creating SolidColorBrush from hex color value

If you don't want to deal with the pain of the conversion every time simply create an extension method.

public static class Extensions
    public static SolidColorBrush ToBrush(this string HexColorString)
        return (SolidColorBrush)(new BrushConverter().ConvertFrom(HexColorString));

Then use like this: BackColor = "#FFADD8E6".ToBrush()

Alternately if you could provide a method to do the same thing.

public SolidColorBrush BrushFromHex(string hexColorString)
    return (SolidColorBrush)(new BrushConverter().ConvertFrom(hexColorString));

BackColor = BrushFromHex("#FFADD8E6");

Foreach Control in form, how can I do something to all the TextBoxes in my Form?

foreach (Control x in this.Controls)
  if (x is TextBox)
    ((TextBox)x).Text = String.Empty;
//instead of above line we can use 
     ***  x.resetText();

Replace line break characters with <br /> in ASP.NET MVC Razor view

Split on newlines (environment agnostic) and print regularly -- no need to worry about encoding or xss:

@if (!string.IsNullOrWhiteSpace(text)) 
    var lines = text.Split(new[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries);
    foreach (var line in lines)

(remove empty entries is optional)

Create multiple threads and wait all of them to complete

I've made a very simple extension method to wait for all threads of a collection:

using System.Collections.Generic;
using System.Threading;

namespace Extensions
    public static class ThreadExtension
        public static void WaitAll(this IEnumerable<Thread> threads)
                foreach(Thread thread in threads)
                { thread.Join(); }

Then you simply call:

List<Thread> threads=new List<Thread>();
// Add your threads to this collection

ValueError: unconverted data remains: 02:05

Well it was very simple. I was missing the format of the date in the json file, so I should write :

st = datetime.strptime(st, '%A %d %B %H %M')

because in the json file the date was like :

"start": "Friday 06 December 02:05",

Foreach with JSONArray and JSONObject

Apparently, org.json.simple.JSONArray implements a raw Iterator. This means that each element is considered to be an Object. You can try to cast:

for(Object o: arr){
    if ( o instanceof JSONObject ) {

This is how things were done back in Java 1.4 and earlier.

.htaccess rewrite subdomain to directory

Redirect subdomain directory:

RewriteCond %{HTTP_HOST} ^([^.]+)\.(archive\.example\.com)$ [NC]
RewriteRule ^ http://%2/%1%{REQUEST_URI} [L,R=301]

How to return a specific status code and no contents from Controller?

This code might work for non-.NET Core MVC controllers:

this.HttpContext.Response.StatusCode = 418; // I'm a teapot
return Json(new { status = "mer" }, JsonRequestBehavior.AllowGet);

Alternative to deprecated getCellType

The accepted answer shows the reason for the deprecation but misses to name the alternative:

CellType    getCellTypeEnum()

where the CellType is the enum decribing the type of the cell.

The plan is to rename getCellTypeEnum() back to getCellType() in POI 4.0.

How can I find the first and last date in a month using PHP?

You can use DateTimeImmutable::modify() :

$date = DateTimeImmutable::createFromFormat('Y-m-d', '2021-02-13');

var_dump($date->modify('first day of this month')->format('Y-m-d')); // string(10) "2021-02-01"
var_dump($date->modify('last day of this month')->format('Y-m-d')); // string(10) "2021-02-28"

sorting and paging with gridview

Save your sorting order in a ViewState.

private const string ASCENDING = " ASC";
private const string DESCENDING = " DESC";

public SortDirection GridViewSortDirection
        if (ViewState["sortDirection"] == null)
            ViewState["sortDirection"] = SortDirection.Ascending;

        return (SortDirection) ViewState["sortDirection"];                
    set { ViewState["sortDirection"] = value; } 

protected void GridView_Sorting(object sender, GridViewSortEventArgs e)
    string sortExpression = e.SortExpression;

    if (GridViewSortDirection == SortDirection.Ascending)
        GridViewSortDirection = SortDirection.Descending;
        SortGridView(sortExpression, DESCENDING);
        GridViewSortDirection = SortDirection.Ascending;
        SortGridView(sortExpression, ASCENDING); 


private void SortGridView(string sortExpression,string direction)
    //  You can cache the DataTable for improving performance
    DataTable dt = GetData().Tables[0]; 

    DataView dv = new DataView(dt); 
    dv.Sort = sortExpression + direction;         

    GridView1.DataSource = dv;

Why you don't want to use existing sorting functionality? You can always customize it.

Sorting Data in a GridView Web Server Control at MSDN

Here is an example with customization:

Open another page in php

    header("Location: index.html");

Just make sure nothing is actually written to the page prior to this code, or it won't work.

How to use std::sort to sort an array in C++

//It is working
using namespace std;
void main()
    int a[5];
    int temp=0;
    cout<<"Enter Values"<<endl;
    for(int i=0;i<5;i++)
    for(int i=0;i<5;i++)
        for(int j=0;j<5;j++)
    cout<<"Asending Series"<<endl;
    for(int i=0;i<5;i++)

    for(int i=0;i<5;i++)
        for(int j=0;j<5;j++)
    cout<<"Desnding Series"<<endl;
    for(int i=0;i<5;i++)


how to set auto increment column with sql developer

I found this post, which looks a bit old, but I figured I'd update everyone on my new findings.

I am using Oracle SQL Developer on Windows. Our database is Oracle 10g (version running on Windows.

To make a column auto-increment in Oracle -

  1. Open up the database connection in the Connections tab
  2. Expand the Tables section, and right click the table that has the column you want to change to auto-increment, and select Edit...
  3. Choose the Columns section, and select the column you want to auto-increment (Primary Key column)
  4. Next, click the "Identity Column" section below the list of columns, and change type from None to "Column Sequence"
  5. Leave the default settings (or change the names of the sequence and trigger if you'd prefer) and then click OK

Your id column (primary key) will now auto-increment, but the sequence will be starting at 1. If you need to increment the id to a certain point, you'll have to run a few alter statements against the sequence.
This post has some more details and how to overcome this.

I found the solution here

How can I select the row with the highest ID in MySQL?


This identifies the largest id and returns the value

What is the difference between compileSdkVersion and targetSdkVersion?

compiledSdkVersion==> which version of SDK should compile your code to bytecode(it uses in development environment) point: it's better use last version of SDK.

minSdkVersion==> these item uses for installation of APK(it uses in production environment). For example:

if(client-sdk-version   <   min-sdk-versoin )

Set Google Maps Container DIV width and height 100%

This Work for me.

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<style type="text/css"> 

    position: relative;
    width: 300px;
    height: 300px;
    overflow: hidden;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
<script type="text/javascript" src=""></script>
<script type="text/javascript">
function initialize() {
  var latlng = new google.maps.LatLng(LAT, LNG);
    var myOptions = {
      zoom: 10,
      center: latlng,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    var map = new google.maps.Map(document.getElementById("map_canvas"),

<body onload="initialize()">
<div id="cont">
<div id="map_canvas" style="width: 100%; height: 100%;"></div>

Gerrit error when Change-Id in commit messages are missing

I got this error message too.

and what makes me think it is useful to give an answer here is that the answer from @Rafal Rawicki is a good solution in some cases but not for all circumstances. example that i met: "git log" we can get the HEAD commit change-id

2.we also can get a 'HEAD' commit change-id on Gerrit website.

3.they are different ,which makes us can not push successfully and get the "missing change-id error"


0.'git add .' your HEAD commit change-id got from 'git log',it will be used later.

2.copy the HEAD commit change-id from Gerrit website.

3.'git reset HEAD'

4.'git commit --amend' and copy the change-id from **Gerrit website** to the commit message in the last paragraph(replace previous change-id)

5.'git push *' you can push successfully now but can not find the HEAD commit from **git log** on Gerrit website too

6.'git reset HEAD'

7.'git commit --amend' and copy the change-id from **git log**(we saved in step 1) to the commit message in the last paragraph(replace previous change-id)

8.'git push *' you can find the HEAD commit from **git log** on Gerrit website,they have the same change-id


Access parent URL from iframe

This worked for me to access the iframe src url.


CSS Pseudo-classes with inline styles

No, this is not possible. In documents that make use of CSS, an inline style attribute can only contain property declarations; the same set of statements that appears in each ruleset in a stylesheet. From the Style Attributes spec:

The value of the style attribute must match the syntax of the contents of a CSS declaration block (excluding the delimiting braces), whose formal grammar is given below in the terms and conventions of the CSS core grammar:

  : S* declaration? [ ';' S* declaration? ]*

Neither selectors (including pseudo-elements), nor at-rules, nor any other CSS construct are allowed.

Think of inline styles as the styles applied to some anonymous super-specific ID selector: those styles only apply to that one very element with the style attribute. (They take precedence over an ID selector in a stylesheet too, if that element has that ID.) Technically it doesn't work like that; this is just to help you understand why the attribute doesn't support pseudo-class or pseudo-element styles (it has more to do with how pseudo-classes and pseudo-elements provide abstractions of the document tree that can't be expressed in the document language).

Note that inline styles participate in the same cascade as selectors in rule sets, and take highest precedence in the cascade (!important notwithstanding). So they take precedence even over pseudo-class states. Allowing pseudo-classes or any other selectors in inline styles would possibly introduce a new cascade level, and with it a new set of complications.

Note also that very old revisions of the Style Attributes spec did originally propose allowing this, however it was scrapped, presumably for the reason given above, or because implementing it was not a viable option.

tap gesture recognizer - which object was tapped?

func tabGesture_Call
     let tapRec = UITapGestureRecognizer(target: self, action: "handleTap:")
     tapRec.delegate = self
     //where we want to gesture like: view, label etc

func handleTap(sender: UITapGestureRecognizer) 
     //handling code

Hash table runtime complexity (insert, search and delete)

Hash tables are O(1) average and amortized case complexity, however it suffers from O(n) worst case time complexity. [And I think this is where your confusion is]

Hash tables suffer from O(n) worst time complexity due to two reasons:

  1. If too many elements were hashed into the same key: looking inside this key may take O(n) time.
  2. Once a hash table has passed its load balance - it has to rehash [create a new bigger table, and re-insert each element to the table].

However, it is said to be O(1) average and amortized case because:

  1. It is very rare that many items will be hashed to the same key [if you chose a good hash function and you don't have too big load balance.
  2. The rehash operation, which is O(n), can at most happen after n/2 ops, which are all assumed O(1): Thus when you sum the average time per op, you get : (n*O(1) + O(n)) / n) = O(1)

Note because of the rehashing issue - a realtime applications and applications that need low latency - should not use a hash table as their data structure.

EDIT: Annother issue with hash tables: cache
Another issue where you might see a performance loss in large hash tables is due to cache performance. Hash Tables suffer from bad cache performance, and thus for large collection - the access time might take longer, since you need to reload the relevant part of the table from the memory back into the cache.

fatal error C1083: Cannot open include file: 'xyz.h': No such file or directory?

The following approach helped me.

Steps :

1.Go to the corresponding directory where the header file that is missing is located. (In my case,../include/unicode/coll.h was missing) and copy the directory location where the header file is located.(Copy till the include directory.)

2.Right click on your project in the Solution Explorer->Properties->Configuration Properties->VC++ Directories->Include Directories. Paste the copied path here.

3.This solved my problem.I hope this helps !

How to retrieve the hash for the current commit in Git?

Another one, using git log:

git log -1 --format="%H"

It's very similar to the of @outofculture though a bit shorter.

AngularJS: How to make angular load script inside ng-include?

To dynamically load recaptcha from a ui-view I use the following method:

In application.js:

    .directive('script', function($parse, $rootScope, $compile) {
    return {
        restrict: 'E',
        terminal: true,
        link: function(scope, element, attr) {
            if (attr.ngSrc) {
                 var domElem = '<script src="'+attr.ngSrc+'" async defer></script>';


In myPartial.client.view.html:

 <script type="application/javascript" ng-src=""></script>

How do I force a favicon refresh?

Well, overhead is overhead, but yes, not too big.

Also, browsers are sometimes "greedy" about cached files. You could clear cache and/or restart your browser and may see the change. If that fails though...

My cheapo solution is to:

  1. Visit your file at in your browser.
  2. Delete the favicon.ico from your webroot.
  3. Visit again in a browser, verify it's missing.
  4. Upload new one to your webroot.
  5. Visit again in a browser, verify it's the new one.

If that sequence doesn't work, then something else is going on.

How do I add an active class to a Link from React Router?

Since router v4 I am using 'refs' for setting the parent active class:


NavLink's innerRef prop accepts callback function, which will receive DOM node as an argument. You can use then any DOM manipulation possible, in this case simply set parent element (<li>) to have the same class:

  const setParentAsActive = node => {
    if (node) {
      node.parentNode.className = node.className;


  • <a> will have unnecessary is-active class (as you only need it for <li>), or you can remove this class in the callback func.
  • if you change the element structure, f.e. wrap a tag inside a span, your callback will stop working, but it's possible to write more sofisticated DOM traverse function
  • you have to do some DOM manipulation

Check if a folder exist in a directory and create them using C#

This should work

if(!Directory.Exists(@"C:\MP_Upload")) {

cannot resolve symbol javafx.application in IntelliJ Idea IDE

You might have a lower project language level than your JDK.

Check if: "Projeckt structure/project/Project-> language level" is lower than your JDK. I had the same problem with JDK 9 and the language level was per default set to 6.

I set the Project Language Level to 9 and everything worked fine after that.

You might have the same issue.

Warning: Cannot modify header information - headers already sent by ERROR

The long-term answer is that all output from your PHP scripts should be buffered in variables. This includes headers and body output. Then at the end of your scripts do any output you need.

The very quick fix for your problem will be to add


as the very first thing in your script, if you only need it in this one script. If you need it in all your scripts add it as the very first thing in your header.php file.

This turns on PHP's output buffering feature. In PHP when you output something (do an echo or print) it has to send the HTTP headers at that time. If you turn on output buffering you can output in the script but PHP doesn't have to send the headers until the buffer is flushed. If you turn it on and don't turn it off PHP will automatically flush everything in the buffer after the script finishes running. There really is no harm in just turning it on in almost all cases and could give you a small performance increase under some configurations.

If you have access to change your php.ini configuration file you can find and change or add the following

output_buffering = On

This will turn output buffering out without the need to call ob_start().

To find out more about output buffering check out

Loop through each row of a range in Excel

Dim a As Range, b As Range

Set a = Selection

For Each b In a.Rows
    MsgBox b.Address

How to "perfectly" override a dict?

My requirements were a bit stricter:

  • I had to retain case info (the strings are paths to files displayed to the user, but it's a windows app so internally all operations must be case insensitive)
  • I needed keys to be as small as possible (it did make a difference in memory performance, chopped off 110 mb out of 370). This meant that caching lowercase version of keys is not an option.
  • I needed creation of the data structures to be as fast as possible (again made a difference in performance, speed this time). I had to go with a builtin

My initial thought was to substitute our clunky Path class for a case insensitive unicode subclass - but:

  • proved hard to get that right - see: A case insensitive string class in python
  • turns out that explicit dict keys handling makes code verbose and messy - and error prone (structures are passed hither and thither, and it is not clear if they have CIStr instances as keys/elements, easy to forget plus some_dict[CIstr(path)] is ugly)

So I had finally to write down that case insensitive dict. Thanks to code by @AaronHall that was made 10 times easier.

class CIstr(unicode):
    """See, especially for inlines"""
    __slots__ = () # does make a difference in memory performance

    def __hash__(self):
        return hash(self.lower())
    def __eq__(self, other):
        if isinstance(other, CIstr):
            return self.lower() == other.lower()
        return NotImplemented
    def __ne__(self, other):
        if isinstance(other, CIstr):
            return self.lower() != other.lower()
        return NotImplemented
    def __lt__(self, other):
        if isinstance(other, CIstr):
            return self.lower() < other.lower()
        return NotImplemented
    def __ge__(self, other):
        if isinstance(other, CIstr):
            return self.lower() >= other.lower()
        return NotImplemented
    def __gt__(self, other):
        if isinstance(other, CIstr):
            return self.lower() > other.lower()
        return NotImplemented
    def __le__(self, other):
        if isinstance(other, CIstr):
            return self.lower() <= other.lower()
        return NotImplemented
    def __repr__(self):
        return '{0}({1})'.format(type(self).__name__,
                                 super(CIstr, self).__repr__())

def _ci_str(maybe_str):
    """dict keys can be any hashable object - only call CIstr if str"""
    return CIstr(maybe_str) if isinstance(maybe_str, basestring) else maybe_str

class LowerDict(dict):
    """Dictionary that transforms its keys to CIstr instances.
    Adapted from:
    __slots__ = () # no __dict__ - that would be redundant

    @staticmethod # because this doesn't make sense as a global function.
    def _process_args(mapping=(), **kwargs):
        if hasattr(mapping, 'iteritems'):
            mapping = getattr(mapping, 'iteritems')()
        return ((_ci_str(k), v) for k, v in
                chain(mapping, getattr(kwargs, 'iteritems')()))
    def __init__(self, mapping=(), **kwargs):
        # dicts take a mapping or iterable as their optional first argument
        super(LowerDict, self).__init__(self._process_args(mapping, **kwargs))
    def __getitem__(self, k):
        return super(LowerDict, self).__getitem__(_ci_str(k))
    def __setitem__(self, k, v):
        return super(LowerDict, self).__setitem__(_ci_str(k), v)
    def __delitem__(self, k):
        return super(LowerDict, self).__delitem__(_ci_str(k))
    def copy(self): # don't delegate w/ super - dict.copy() -> dict :(
        return type(self)(self)
    def get(self, k, default=None):
        return super(LowerDict, self).get(_ci_str(k), default)
    def setdefault(self, k, default=None):
        return super(LowerDict, self).setdefault(_ci_str(k), default)
    __no_default = object()
    def pop(self, k, v=__no_default):
        if v is LowerDict.__no_default:
            # super will raise KeyError if no default and key does not exist
            return super(LowerDict, self).pop(_ci_str(k))
        return super(LowerDict, self).pop(_ci_str(k), v)
    def update(self, mapping=(), **kwargs):
        super(LowerDict, self).update(self._process_args(mapping, **kwargs))
    def __contains__(self, k):
        return super(LowerDict, self).__contains__(_ci_str(k))
    def fromkeys(cls, keys, v=None):
        return super(LowerDict, cls).fromkeys((_ci_str(k) for k in keys), v)
    def __repr__(self):
        return '{0}({1})'.format(type(self).__name__,
                                 super(LowerDict, self).__repr__())

Implicit vs explicit is still a problem, but once dust settles, renaming of attributes/variables to start with ci (and a big fat doc comment explaining that ci stands for case insensitive) I think is a perfect solution - as readers of the code must be fully aware that we are dealing with case insensitive underlying data structures. This will hopefully fix some hard to reproduce bugs, which I suspect boil down to case sensitivity.

Comments/corrections welcome :)

Split a string by a delimiter in python

When you have two or more (in the example below there're three) elements in the string, then you can use comma to separate these items:

date, time, event_name = ev.get_text(separator='@').split("@")

After this line of code, the three variables will have values from three parts of the variable ev

So, if the variable ev contains this string and we apply separator '@':

Sa., 23. März@19:00@Klavier + Orchester: SPEZIAL

Then, after split operation the variable

  • date will have value "Sa., 23. März"
  • time will have value "19:00"
  • event_name will have value "Klavier + Orchester: SPEZIAL"

Ignore <br> with CSS?

For me looks better like this:

Some text, Some text, Some text

br {_x000D_
  display: inline;_x000D_
  content: '';_x000D_
br:after {_x000D_
  content: ', ';_x000D_
  display: inline-block;_x000D_
<div style="display:block">_x000D_
  <span>Some text</span>_x000D_
  <span>Some text</span>_x000D_
  <span>Some text</span>_x000D_

SimpleDateFormat returns 24-hour date: how to get 12-hour date?

You can try it like this

  Calendar c= Calendar.getInstance();

  SimpleDateFormat sdf= new SimpleDateFormat("dd/MM/yyyy hh:mm:ss a");
  String str=sdf.format(c.getTime());

How to name and retrieve a stash by name in git?

It's unfortunate that git stash apply stash^{/<regex>} doesn't work (it doesn't actually search the stash list, see the comments under the accepted answer).

Here are drop-in replacements that search git stash list by regex to find the first (most recent) stash@{<n>} and then pass that to git stash <command>:

# standalone (replace <stash_name> with your regex)
(n=$(git stash list --max-count=1 --grep=<stash_name> | cut -f1 -d":") ; if [[ -n "$n" ]] ; then git stash show "$n" ; else echo "Error: No stash matches" ; return 1 ; fi)
(n=$(git stash list --max-count=1 --grep=<stash_name> | cut -f1 -d":") ; if [[ -n "$n" ]] ; then git stash apply "$n" ; else echo "Error: No stash matches" ; return 1 ; fi)
# ~/.gitconfig
  sshow = "!f() { n=$(git stash list --max-count=1 --grep=$1 | cut -f1 -d":") ; if [[ -n "$n" ]] ; then git stash show "$n" ; else echo "Error: No stash matches $1" ; return 1 ; fi }; f"
  sapply = "!f() { n=$(git stash list --max-count=1 --grep=$1 | cut -f1 -d":") ; if [[ -n "$n" ]] ; then git stash apply "$n" ; else echo "Error: No stash matches $1" ; return 1 ; fi }; f"

# usage:

$ git sshow my_stash
 myfile.txt | 1 +
 1 file changed, 1 insertion(+)

$ git sapply my_stash
On branch master
Your branch is up to date with 'origin/master'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

    modified:   myfile.txt

no changes added to commit (use "git add" and/or "git commit -a")

Note that proper result codes are returned so you can use these commands within other scripts. This can be verified after running commands with:

echo $?

Just be careful about variable expansion exploits because I wasn't sure about the --grep=$1 portion. It should maybe be --grep="$1" but I'm not sure if that would interfere with regex delimiters (I'm open to suggestions).

How do I get the raw request body from the Request.Content object using .net 4 api endpoint

For other future users who do not want to make their controllers asynchronous, or cannot access the HttpContext, or are using dotnet core (this answer is the first I found on Google trying to do this), the following worked for me:

public IActionResult Put(int pathId, int subPathId, [FromBody] myViewModel viewModel)

    var body = new StreamReader(Request.Body);
    //The modelbinder has already read the stream and need to reset the stream index
    body.BaseStream.Seek(0, SeekOrigin.Begin); 
    var requestBody = body.ReadToEnd();
    //etc, we use this for an audit trail

HTTP 404 when accessing .svc file in IIS

I see you've already solved your problem - but for posterity:

We had a similar problem, and the SVC handler was already correctly installed. Our problem was the ExtensionlessUrl handler processing requests before they reached the SVC handler.

To check this - in Handler Mappings in IIS Manager at the web server level, view the list of handlers in order (it's an option on the right-hand side). If the various ExtensionlessUrl handlers appear above the SVC handlers, then repeatedly move them down until they're at the bottom.

drag drop files into standard html file input

I know some trick works in Chrome:

When dropping files into drop zone you get a dataTransfer.files object, that is a FileList type of object, that contains all the files you dragged. Meanwhile, <input type="file" /> element has the property files, that is the same FileList type object.

So, you can simply assign the dataTransfer.files object to the input.files property.

How to load a xib file in a UIView

For Swift 4.2

Let's assume you have a class named NibView and associated nib file is NibView.xib

class NibView: UIView {

    class func getScreen() -> NibView {
        let xib = Bundle.main.loadNibNamed(String(describing :self), owner: self, options: nil)
        let me = xib![0] as! NibView
        return me


create an instance of the class and add in your view with your specific layout whatever you want

let myView = NibView.getScreen()

Temporarily change current working directory in bash to run a command

You can run the cd and the executable in a subshell by enclosing the command line in a pair of parentheses:

(cd SOME_PATH && exec_some_command)


$ pwd
$ (cd /tmp && pwd)  # directory changed in the subshell
$ pwd               # parent shell's pwd is still the same

Removing a model in rails (reverse of "rails g model Title...")

Try this

rails destroy model Rating

It will remove model, migration, tests and fixtures

Split array into chunks

EDIT: @mblase75 added more concise code to the earlier answer while I was writing mine, so I recommend going with his solution.

You could use code like this:

var longArray = ["Element 1","Element 2","Element 3", /*...*/];
var smallerArrays = []; // will contain the sub-arrays of 10 elements each
var arraySize = 10;
for (var i=0;i<Math.ceil(longArray.length/arraySize);i++) {

Change the value of arraySize to change the maximum length of the smaller arrays.

CSS div element - how to show horizontal scroll bars only?

We should set to overflow: auto and hide a scrollbar which we don't use for working on unsupporting CSS3 browser. Look at this CSS Overflow;

How can one print a size_t variable portably using the printf family?

std::size_t s = 1024;
std::cout << s; // or any other kind of stream like stringstream!

Reload the page after ajax success

use this Reload page

success: function(data){
   if(data.success == true){ // if true (1)
      setTimeout(function(){// wait for 5 secs(2)
           location.reload(); // then reload the page.(3)
      }, 5000); 

A table name as a variable

You'll need to generate the SQL content dynamically:

declare @tablename varchar(50)

set @tablename = 'test'

declare @sql varchar(500)

set @sql = 'select * from ' + @tablename

exec (@sql)

Angular2 module has no exported member

You do not need the line:

import { SigninComponent, RegisterComponent } from './auth/auth.module';

in your app.component.ts as you already included the AuthModule in your app.module.ts. AutModule import is sufficient to use your component in the app.

The error that you get is a TypeScript error, not a Angular one, and it is correct in stating that there is no exported member, as it searches for a valid EC6 syntax for export, not angular module export. This line would thus work in your app.component.ts:

import { SigninComponent } from './auth/components/signin.component';

error LNK2005: xxx already defined in MSVCRT.lib(MSVCR100.dll) C:\something\LIBCMT.lib(setlocal.obj)

Getting this error, I changed the

c/C++ > Code Generation > Runtime Library to Multi-threaded library (DLL) /MD

for both code project and associated Google Test project. This solved the issue.

Note: all components of the project must have the same definition in c/C++ > Code Generation > Runtime Library. Either DLL or not DLL, but identical.

How to add new column to an dataframe (to the front not end)?

Add column "a"

> df["a"] <- 0
> df
  b c d a
1 1 2 3 0
2 1 2 3 0
3 1 2 3 0

Sort by column using colum name

> df <- df[c('a', 'b', 'c', 'd')]
> df
  a b c d
1 0 1 2 3
2 0 1 2 3
3 0 1 2 3

Or sort by column using index

> df <- df[colnames(df)[c(4,1:3)]]
> df
  a b c d
1 0 1 2 3
2 0 1 2 3
3 0 1 2 3

Getting 400 bad request error in Jquery Ajax POST

You need to build query from "data" object using the following function

function buildQuery(obj) {
        var Result= '';
        if(typeof(obj)== 'object') {
            jQuery.each(obj, function(key, value) {
                Result+= (Result) ? '&' : '';
                if(typeof(value)== 'object' && value.length) {
                    for(var i=0; i<value.length; i++) {
                        Result+= [key+'[]', encodeURIComponent(value[i])].join('=');
                } else {
                    Result+= [key, encodeURIComponent(value)].join('=');
        return Result;

and then proceed with

var data= {
"subject:title":"Test Name",
"subject:description":"Creating test subject to check POST method API",
"sub:tags": ["facebook:work, facebook:likes"],
"sampleSize" : 10,
"values": ["science", "machine-learning"]

  type: 'POST',
  url: "http://localhost:8080/project/server/rest/subjects",
  data: buildQuery(data),
  error: function(e) {

How to output a comma delimited list in jinja python template?

And using the joiner from

{% set comma = joiner(",") %}
{% for user in userlist %}
    {{ comma() }}<a href="/profile/{{ user }}/">{{ user }}</a>
{% endfor %}  

It's made for this exact purpose. Normally a join or a check of forloop.last would suffice for a single list, but for multiple groups of things it's useful.

A more complex example on why you would use it.

{% set pipe = joiner("|") %}
{% if categories %} {{ pipe() }}
    Categories: {{ categories|join(", ") }}
{% endif %}
{% if author %} {{ pipe() }}
    Author: {{ author() }}
{% endif %}
{% if can_edit %} {{ pipe() }}
    <a href="?action=edit">Edit</a>
{% endif %}

using .join method to convert array to string without commas

You can specify an empty string as an argument to join, if no argument is specified a comma is used.


Initialising a multidimensional array in Java

You can declare multi dimensional arrays like :

// 4 x 5 String arrays, all Strings are null
// [0] -> [null,null,null,null,null]
// [1] -> [null,null,null,null,null]
// [2] -> [null,null,null,null,null]
// [3] -> [null,null,null,null,null]

String[][] sa1 = new String[4][5];
for(int i = 0; i < sa1.length; i++) {           // sa1.length == 4
    for (int j = 0; j < sa1[i].length; j++) {     //sa1[i].length == 5
        sa1[i][j] = "new String value";

// 5 x 0  All String arrays are null
// [null]
// [null]
// [null]
// [null]
// [null]
String[][] sa2 = new String[5][];
for(int i = 0; i < sa2.length; i++) {
    String[] anon = new String[ /* your number here */];
    // or String[] anon = new String[]{"I'm", "a", "new", "array"};
    sa2[i] = anon;

// [0] -> ["I'm","in","the", "0th", "array"]
// [1] -> ["I'm", "in", "another"]
String[][] sa3 = new String[][]{ {"I'm","in","the", "0th", "array"},{"I'm", "in", "another"}};

Using pip behind a proxy with CNTLM

With Ubuntu I could not get the proxy option to work as advertised – so following command did not work:

sudo pip --proxy install somepackage

But exporting the https_proxy environment variable (note its https_proxy not http_proxy) did the trick:

export https_proxy=


sudo -E pip install somepackage

Horizontal ListView in Android?

As per Android Documentation RecyclerView is the new way to organize the items in listview and to be displayed horizontally


  1. Since by using Recyclerview Adapter, ViewHolder pattern is automatically implemented
  2. Animation is easy to perform
  3. Many more features

More Information about RecyclerView:



Just add the below block to make the ListView to horizontal from vertical


LinearLayoutManager layoutManager= new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL, false);
mRecyclerView = (RecyclerView) findViewById(;

Visual Studio 2013 Install Fails: Program Compatibility Mode is on (Windows 10)

If you are installing from an ISO file by mounting it on a Virtual Drive, Just copy the files from the Virtual Drive to your hard disk. Run the installer, it will definitely work. I have solved my problem.

How can labels/legends be added for all chart types in chart.js (

You can include a legend template in the chart options:

//legendTemplate takes a template as a string, you can populate the template with values from your dataset 
var options = {
  legendTemplate : '<ul>'
                  +'<% for (var i=0; i<datasets.length; i++) { %>'
                    +'<span style=\"background-color:<%=datasets[i].lineColor%>\"></span>'
                    +'<% if (datasets[i].label) { %><%= datasets[i].label %><% } %>'
                +'<% } %>'

  //don't forget to pass options in when creating new Chart
  var lineChart = new Chart(element).Line(data, options);

  //then you just need to generate the legend
  var legend = lineChart.generateLegend();

  //and append it to your page somewhere

You'll also need to add some basic css to get it looking ok.

How to create a foreign key in phpmyadmin

The key must be indexed to apply foreign key constraint. To do that follow the steps.

  1. Open table structure. (2nd tab)
  2. See the last column action where multiples action options are there. Click on Index, this will make the column indexed.
  3. Open relation view and add foreign key constraint.

You will be able to assign DOCTOR_ID as foreign now.

MySQL: determine which database is selected?

Just use mysql_query (or mysqli_query, even better, or use PDO, best of all) with:



There is much discussion over whether or not FROM DUAL should be included in this or not. On a technical level, it is a holdover from Oracle and can safely be removed. If you are inclined, you can use the following instead:


That said, it is perhaps important to note, that while FROM DUAL does not actually do anything, it is valid MySQL syntax. From a strict perspective, including braces in a single line conditional in JavaScript also does not do anything, but it is still a valid practice.

'int' object has no attribute '__getitem__'

Some of the problems:

for i in range[6]:
            for j in range[6]:

should be:


Java String encoding (UTF-8)

This could be complicated way of doing

String newString = new String(oldString);

This shortens the String is the underlying char[] used is much longer.

However more specifically it will be checking that every character can be UTF-8 encoded.

There are some "characters" you can have in a String which cannot be encoded and these would be turned into ?

Any character between \uD800 and \uDFFF cannot be encoded and will be turned into '?'

String oldString = "\uD800";
String newString = new String(oldString.getBytes("UTF-8"), "UTF-8");



Prevent browser caching of AJAX call result

All the answers here leave a footprint on the requested URL which will show up in the access logs of server.

I needed a header based solution with no side effect and I found it can be achieved by setting up the headers mentioned in How to control web page caching, across all browsers?.

The result, working for Chrome at least, would be:

   url: url, _x000D_
   headers: {_x000D_
     'Cache-Control': 'no-cache, no-store, must-revalidate', _x000D_
     'Pragma': 'no-cache', _x000D_
     'Expires': '0'_x000D_

Creating a timer in python

I want to create a kind of stopwatch that when minutes reach 20 minutes, brings up a dialog box.

All you need is to sleep the specified time. time.sleep() takes seconds to sleep, so 20 * 60 is 20 minutes.

import time
run = raw_input("Start? > ")
time.sleep(20 * 60)

How do I style (css) radio buttons and labels?

This will get your buttons and labels next to each other, at least. I believe the second part can't be done in css alone, and will need javascript. I found a page that might help you with that part as well, but I don't have time right now to try it out:

<style type="text/css">
.input input {
  float: left;
.input label {
  margin: 5px;
<div class="input radio">
        <legend>What color is the sky?</legend>
        <input type="hidden" name="data[Submit][question]" value="" id="SubmitQuestion" />

        <input type="radio" name="data[Submit][question]" id="SubmitQuestion1" value="1"  />
        <label for="SubmitQuestion1">A strange radient green.</label>

        <input type="radio" name="data[Submit][question]" id="SubmitQuestion2" value="2"  />
        <label for="SubmitQuestion2">A dark gloomy orange</label>
        <input type="radio" name="data[Submit][question]" id="SubmitQuestion3" value="3"  />
        <label for="SubmitQuestion3">A perfect glittering blue</label>

Sending emails with Javascript

Here's the way doing it using jQuery and an "element" to click on :

    $(location).attr('href', 'mailto:?subject='
                             + encodeURIComponent("This is my subject")
                             + "&body=" 
                             + encodeURIComponent("This is my body")

Then, you can get your contents either by feeding it from input fields (ie. using $('#input1').val() or by a server side script with $.get('...'). Have fun

Find something in column A then show the value of B for that row in Excel 2010


source data range is A1:B100.
query cell is D1 (here you will input Police or Fire).
result cell is E1

Formula in E1 = VLOOKUP(D1, A1:B100, 2, FALSE)

Send request to curl with post data sourced from a file

If you are using form data to upload file,in which a parameter name must be specified , you can use:

curl -X POST -i -F "parametername=@filename" -F "additional_parm=param2" host:port/xxx

Docker CE on RHEL - Requires: container-selinux >= 2.9

[SOLVED] Simple one command to fix this issue.

yum install

Hide password with "•••••••" in a textField

You can do this by using properties of textfield from Attribute inspector

Tap on Your Textfield from storyboard and go to Attribute inspector , and just check the checkbox of "Secure Text Entry" SS is added for graphical overview to achieve same

How to take complete backup of mysql database using mysqldump command line utility

In addition to the --routines flag you will need to grant the backup user permissions to read the stored procedures:

GRANT SELECT ON `mysql`.`proc` TO <backup user>@<backup host>;

My minimal set of GRANT privileges for the backup user are:

GRANT SELECT ON `mysql`.`proc` TO ...

How to get a list of images on docker registry v2

Get catalogs

Default, registry api return 100 entries of catalog, there is the code:

When you curl the registry api:

curl --cacert domain.crt https://your.registry:5000/v2/_catalog

it equivalents with:

curl --cacert domain.crt https://your.registry:5000/v2/_catalog?n=100

This is a pagination methond.

When the sum of entries beyond 100, you can do in two ways:

First: give a bigger number

curl --cacert domain.crt https://your.registry:5000/v2/_catalog?n=2000

Sencond: parse the next linker url

curl --cacert domain.crt https://your.registry:5000/v2/_catalog

A link element contained in response header:

curl --cacert domain.crt https://your.registry:5000/v2/_catalog

response header:

Link: </v2/_catalog?last=pro-octopus-ws&n=100>; rel="next"

The link element have the last entry of this request, then you can request the next 'page':

curl --cacert domain.crt https://your.registry:5000/v2/_catalog?last=pro-octopus-ws

If the response header contains link element, you can do it in a loop.

Get Images

When you get the result of catalog, it like follows:

{ "repositories": [ "busybox", "ceph/mds" ] }

you can get the images in every catalog:

curl --cacert domain.crt https://your.registry:5000/v2/busybox/tags/list



Fatal error: Call to a member function query() on null

First, you declared $db outside the function. If you want to use it inside the function, you should put this at the begining of your function code:

global $db;

And I guess, when you wrote:

        return (mysqli_result($query, 0) == 1) ? true : false;

what you really wanted was:

if ($result->num_rows==1) { return true; } else { return false; }

Fetching data from MySQL database to html dropdown list

What you are asking is pretty straight forward

  1. execute query against your db to get resultset or use API to get the resultset

  2. loop through the resultset or simply the result using php

  3. In each iteration simply format the output as an element

the following refernce should help

HTML option tag

Getting Datafrom MySQL database

hope this helps :)

jQuery ajax upload file in mvc

You can't upload files via ajax, you need to use an iFrame or some other trickery to do a full postback. This is mainly due to security concerns.

Here's a decent write-up including a sample project using SWFUpload and ASP.Net MVC by Steve Sanderson. It's the first thing I read getting this working properly with Asp.Net MVC (I was new to MVC at the time as well), hopefully it's as helpful for you.

ModelState.AddModelError - How can I add an error that isn't for a property?

I eventually stumbled upon an example of the usage I was looking for - to assign an error to the Model in general, rather than one of it's properties, as usual you call:

ModelState.AddModelError(string key, string errorMessage);

but use an empty string for the key:

ModelState.AddModelError(string.Empty, "There is something wrong with Foo.");

The error message will present itself in the <%: Html.ValidationSummary() %> as you'd expect.

C# Error: Parent does not contain a constructor that takes 0 arguments

By default compiler tries to call parameterless constructor of base class.

In case if the base class doesn't have a parameterless constructor, you have to explicitly call it yourself:

public child(int i) : base(i){

Ref : Constructor calling hierarchy during inheritance

What should I do if the current ASP.NET session is null?

The following statement is not entirely accurate:

"So if you are calling other functionality, including static classes, from your page, you should be fine"

I am calling a static method that references the session through HttpContext.Current.Session and it is null. However, I am calling the method via a webservice method through ajax using jQuery.

As I found out here you can fix the problem with a simple attribute on the method, or use the web service session object:

There’s a trick though, in order to access the session state within a web method, you must enable the session state management like so:

[WebMethod(EnableSession = true)]

By specifying the EnableSession value, you will now have a managed session to play with. If you don’t specify this value, you will get a null Session object, and more than likely run into null reference exceptions whilst trying to access the session object.

Thanks to Matthew Cosier for the solution.

Just thought I'd add my two cents.


node.js: cannot find module 'request'

if some module you cant find, try with Static URI, for example:

var Mustache = require("/media/fabio/Datos/Express/2_required_a_module/node_modules/mustache/mustache.js");

This example, run on Ubuntu Gnome 16.04 of 64 bits, node -v: v4.2.6, npm: 3.5.2 Refer to: Blog of Ben Nadel

Data binding to SelectedItem in a WPF Treeview

(Let's just all agree that TreeView is obviously busted in respect to this problem. Binding to SelectedItem would have been obvious. Sigh)

I needed the solution to interact properly with the IsSelected property of TreeViewItem, so here's how I did it:

// the Type CustomThing needs to implement IsSelected with notification
// for this to work.
public class CustomTreeView : TreeView
    public CustomThing SelectedCustomThing
            return (CustomThing)GetValue(SelectedNode_Property);
            SetValue(SelectedNode_Property, value);
            if(value != null) value.IsSelected = true;

    public static DependencyProperty SelectedNode_Property =
            new FrameworkPropertyMetadata(

    public CustomTreeView(): base()
        this.SelectedItemChanged += new RoutedPropertyChangedEventHandler<object>(SelectedItemChanged_CustomHandler);

    void SelectedItemChanged_CustomHandler(object sender, RoutedPropertyChangedEventArgs<object> e)
        SetValue(SelectedNode_Property, SelectedItem);

    private static void SelectedNodeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        var treeView = d as CustomTreeView;
        var newNode = e.NewValue as CustomThing;

        treeView.SelectedCustomThing = (CustomThing)e.NewValue;

With this XAML:

<local:CustonTreeView ItemsSource="{Binding TreeRoot}" 
    SelectedCustomThing="{Binding SelectedNode,Mode=TwoWay}">
        <Style TargetType="TreeViewItem">
            <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />

"Couldn't read dependencies" error with npm

Recently, I've started to get an error:

npm ERR! install Couldn't read dependencies
npm ERR! Error: Invalid version: "1.0"

So, you may need to specify version of your package with 3 numbers, e.g. 1.0.0 instead of 1.0 if you get similar error.

Is a DIV inside a TD a bad idea?

Two ways of dealing with it

  1. put div inside tbody tag
  2. put div inside tr tag

Both approaches are valid, if you see feference:

Create pandas Dataframe by appending one row at a time

before going to add a row, we have to convert the dataframe to dictionary there you can see the keys as columns in dataframe and values of the columns are again stored in the dictionary but there key for every column is the index number in dataframe. That idea make me to write the below code.

values=["s_101","hyderabad",10,20,16,13,15,12,12,13,25,26,25,27,"good","bad"] #this is total row that we are going to add
for x in df.columns:   #here df.columns gives us the main dictionary key
    df2[x][101]=values[i]   #here the 101 is our index number it is also key of sub dictionary

Disable-web-security in Chrome 48+

I'm seeing the same thing. A quick google found this question and a bug on the chromium forums. It seems that the --user-data-dir flag is now required. Edit to add user-data-dir guide

presenting ViewController with NavigationViewController swift


let VC1 = self.storyboard!.instantiateViewController(withIdentifier: "MyViewController") as! MyViewController
let navController = UINavigationController(rootViewController: VC1)
self.present(navController, animated:true, completion: nil)

What datatype should be used for storing phone numbers in SQL Server 2005?

We use varchar(15) and certainly index on that field.

The reason being is that International standards can support up to 15 digits

Wikipedia - Telephone Number Formats

If you do support International numbers, I recommend the separate storage of a World Zone Code or Country Code to better filter queries by so that you do not find yourself parsing and checking the length of your phone number fields to limit the returned calls to USA for example

jQuery: Setting select list 'selected' based on text, failing strangely

The following works for text entries both with and without spaces:

$("#mySelect1").find("option[text=" + text1 + "]").attr("selected", true);

Check which element has been clicked with jQuery

$("#news_gallery li .over").click(function() {
    article = $("#news-article .news-article");

How to install Java 8 on Mac

I just did this on my MBP, and had to use

$ brew tap homebrew/cask-versions
$ brew cask install java8

in order to get java8 to install.

What are intent-filters in Android?

When there are multiple activities set as main and launcher with an intent filter in the manifest. Then first activity considers as Launcher activity, and android launch or open the first activity.

<category android:name="android.intent.category.LAUNCHER" />  

The above code makes an app icon available in the device menu, so if we declare 2 launcher activity in the manifest, there will be 2 app icons get created in the device app menu.

So there will be 2 app icons, on click of the first icon, first declared activity in manifest will be launch, and click of another second declared activity gets launch

When should the xlsm or xlsb formats be used?

One could think that xlsb has only advantages over xlsm. The fact that xlsm is XML-based and xlsb is binary is that when workbook corruption occurs, you have better chances to repair a xlsm than a xlsb.

How to keep the console window open in Visual C++?

My 2 Cents:

Choice 1: Add a breakpoint at the end of main()

Choice 2: Add this code, right before the return 0;:

std::cout << "Press ENTER to continue..."; //So the User knows what to do
std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');

You need to include <iomanip> for std::numeric_limits

Detect Safari using jQuery

Using a mix of feature detection and Useragent string:

    var is_opera = !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
    var is_Edge = navigator.userAgent.indexOf("Edge") > -1;
    var is_chrome = !! && !is_opera && !is_Edge;
    var is_explorer= typeof document !== 'undefined' && !!document.documentMode && !is_Edge;
    var is_firefox = typeof window.InstallTrigger !== 'undefined';
    var is_safari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);

if (is_safari) alert('Safari');

Or for Safari only, use this :

if ( /^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {alert('Its Safari');}

Split string on whitespace in Python

The str.split() method without an argument splits on whitespace:

>>> "many   fancy word \nhello    \thi".split()
['many', 'fancy', 'word', 'hello', 'hi']

Running CMake on Windows

There is a vcvars32.bat in your Visual Studio installation directory. You can add call cmd.exe at the end of that batch program and launch it. From that shell you can use CMake or cmake-gui and cl.exe would be known to CMake.

What's the difference between ".equals" and "=="?

(1) == can be be applied for both primitives and object types, but equals() method can be applied for only object types.

(2) == cannot be overridden for content comparison, but equals method can be overridden for content comparison(ex; String class, wrapper classes, collection classes).

(3) == gives incomparable types error when try to apply for heterogeneous types , where as equals method returns false.

Default Activity not found in Android Studio

If you are still getting an error that says "Default Activity not found" when you try to edit the run configurations even after executing:

Invalidate cache and Restart.

Then try deleting the Settings/Preferences folder:

/< USER_HOME_DIR >/.AndroidStudioPreview3.2

or on Mac :


FormsAuthentication.SignOut() does not log the user out

Users can still browse your website because cookies are not cleared when you call FormsAuthentication.SignOut() and they are authenticated on every new request. In MS documentation is says that cookie will be cleared but they don't, bug? Its exactly the same with Session.Abandon(), cookie is still there.

You should change your code to this:


// clear authentication cookie
HttpCookie cookie1 = new HttpCookie(FormsAuthentication.FormsCookieName, "");
cookie1.Expires = DateTime.Now.AddYears(-1);

// clear session cookie (not necessary for your current problem but i would recommend you do it anyway)
SessionStateSection sessionStateSection = (SessionStateSection)WebConfigurationManager.GetSection("system.web/sessionState");
HttpCookie cookie2 = new HttpCookie(sessionStateSection.CookieName, "");
cookie2.Expires = DateTime.Now.AddYears(-1);


HttpCookie is in the System.Web namespace. MSDN Reference.

How to change cursor from pointer to finger using jQuery?

It is very straight forward


<input type="text" placeholder="some text" />
<input type="button" value="button" class="button"/>
<button class="button">Another button</button>


  $('.button').css( 'cursor', 'pointer' );

  // for old IE browsers
  $('.button').css( 'cursor', 'hand' ); 

Check it out on JSfiddle

disable textbox using jquery?


<span id="radiobutt">
  <input type="radio" name="rad1" value="1" />
  <input type="radio" name="rad1" value="2" />
  <input type="radio" name="rad1" value="3" />
  <input type="text" id="textbox1" />
  <input type="checkbox" id="checkbox1" />


  $("#radiobutt input[type=radio]").each(function(i){
    $(this).click(function () {
        if(i==2) { //3rd radiobutton
            $("#textbox1").attr("disabled", "disabled"); 
            $("#checkbox1").attr("disabled", "disabled"); 
        else {


Iterating Over Dictionary Key Values Corresponding to List in Python

Dictionary objects allow you to iterate over their items. Also, with pattern matching and the division from __future__ you can do simplify things a bit.

Finally, you can separate your logic from your printing to make things a bit easier to refactor/debug later.

from __future__ import division

def Pythag(league):
    def win_percentages():
        for team, (runs_scored, runs_allowed) in league.iteritems():
            win_percentage = round((runs_scored**2) / ((runs_scored**2)+(runs_allowed**2))*1000)
            yield win_percentage

    for win_percentage in win_percentages():
        print win_percentage

How to read single Excel cell value

Please try this. Maybe this could help you. It works for me.

string sValue = (range.Cells[_row, _column] as Microsoft.Office.Interop.Excel.Range).Value2.ToString();
//_row,_column your column & row number 
//eg: string sValue = (sheet.Cells[i + 9, 12] as Microsoft.Office.Interop.Excel.Range).Value2.ToString();
//sValue has your value

How to find the Git commit that introduced a string in any branch?

Messing around with the same answers:

$ git config --global alias.find '!git log --color -p -S '
  • ! is needed because other way, git do not pass argument correctly to -S. See this response
  • --color and -p helps to show exactly "whatchanged"

Now you can do

$ git find <whatever>


$ git find <whatever> --all
$ git find <whatever> master develop

PANIC: Broken AVD system path. Check your ANDROID_SDK_ROOT value

A fix if your user contains non-ASCII characters

For people getting "PANIC: Broken AVD system path. Check your ANDROID_SDK_ROOT", the reason for this might be that your user in users contains non-ASCII characters.

Therefore both the SDK and .android folder with the AVD folder need to be moved to another folder.

Changing the SDK path:

Open Android Studio, go to configure, and choose the SDK Manager. Change the current Android SDK Location to e.g "C:\Android\Sdk" (Or somewhere else, just not in the user folder containing non-ASCII characters).

After this, add the following system variables:


Changing the AVD path:

To change where the AVD folder is placed (Normally placed in "C:\Users\<user name>\.android\avd"), you need to change where the .android is placed. First close Android Studio, then add the system variable ANDROID_SDK_HOME with the path to the new place you want .android to be, e.g C:\Android_SDK_HOME as used in another example:


After you added this, run Android Studio. Then close it again. Now a folder called .android should have appeared.

The next and last thing you need to do is to set the ANDROID_AVD_HOME system variable. In this case that will be in C:\Android_SDK_HOME\.android\avd

ANDROID_AVD_HOME C:\Android_SDK_HOME\.android\avd

I hope this resolves the problem for some. :)

Appending to an existing string

Can I ask why this is important?

I know that this is not a direct answer to your question, but the fact that you are trying to preserve the object ID of a string might indicate that you should look again at what you are trying to do.

You might find, for instance, that relying on the object ID of a string will lead to bugs that are quite hard to track down.

Are the days of passing const std::string & as a parameter over?

The reason Herb said what he said is because of cases like this.

Let's say I have function A which calls function B, which calls function C. And A passes a string through B and into C. A does not know or care about C; all A knows about is B. That is, C is an implementation detail of B.

Let's say that A is defined as follows:

void A()

If B and C take the string by const&, then it looks something like this:

void B(const std::string &str)

void C(const std::string &str)
  //Do something with `str`. Does not store it.

All well and good. You're just passing pointers around, no copying, no moving, everyone's happy. C takes a const& because it doesn't store the string. It simply uses it.

Now, I want to make one simple change: C needs to store the string somewhere.

void C(const std::string &str)
  //Do something with `str`.
  m_str = str;

Hello, copy constructor and potential memory allocation (ignore the Short String Optimization (SSO)). C++11's move semantics are supposed to make it possible to remove needless copy-constructing, right? And A passes a temporary; there's no reason why C should have to copy the data. It should just abscond with what was given to it.

Except it can't. Because it takes a const&.

If I change C to take its parameter by value, that just causes B to do the copy into that parameter; I gain nothing.

So if I had just passed str by value through all of the functions, relying on std::move to shuffle the data around, we wouldn't have this problem. If someone wants to hold on to it, they can. If they don't, oh well.

Is it more expensive? Yes; moving into a value is more expensive than using references. Is it less expensive than the copy? Not for small strings with SSO. Is it worth doing?

It depends on your use case. How much do you hate memory allocations?

MySQL Workbench Edit Table Data is read only

I'm assuming the table has a primary key. First try to run a unlock tables command to see if that fixes it.

If all else fails you can alter the table to create a new primary key column with auto-increment and that should hopefully fix it. Once you're done you should be able to remove the column without any issues.

As always you want to make a backup before altering tables around. :)

Note: MySQL workbench cannot work without a primary key if that's your issue. However if you have a many to many table you can set both columns as primary keys which will let you edit the data.

How to make a PHP SOAP call using the SoapClient class

First initialize webservices:

$client = new SoapClient("");

Then set and pass the parameters:

$params = array (
    "arg0" => $contactid,
    "arg1" => $desc,
    "arg2" => $contactname

$response = $client->__soapCall('methodname', array($params));

Note that the method name is available in WSDL as operation name, e.g.:

<operation name="methodname">

if...else within JSP or JSTL

<%@ taglib prefix='c' uri='' %>
<c:set var="val" value="5"/>
  <c:when test="${val == '5'}">
    Value is 5
    Value is not 5

JavaScript file not updating no matter what I do

The best way around browsercaches is to append a random number to the path of the js file.

Example in pseudo code:

// generate a random number
int i = Random.Next();
echo "<script src='a.js?'" + i + "></script>";

This will make sure your browser always reloads the file, because it thinks it's a different file because of the random number in the url.

The server will always return the file and ignore what comes after the '?'.

I just had to Clean my project and then it built successfully afterwards.

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

This is an IDE issue. Change the setting in the PowerShell GUI. Go to the Tools tab and select Options, and then Debugging options. Then check the box Turn off requirement for scripts to be signed. Done.

Change default global installation directory for node.js modules in Windows?

Find the current path of your global node package installation by following command.

npm list -g --depth=0

Change this path to correct path by following command.

npm set prefix C:\Users\username(Number)\AppData\Roaming\npm\node_modules

It worked for me. Read my previous answer for better understanding.

Python basics printing 1 to 100

The first line defines the variable. The second line loops it to 100, the third adds 1 to a and the 4th divides a by 3 and if there is no remainder (0) it will print that number otherwise it will print a blank line.

 a = (0)

for i in range(0,100):
     a = a + 1
if a % 3 == 0:

Getting current device language in iOS?

If you want to get only language here is my suggested answer:

NSString *langplusreg = [[NSLocale preferredLanguages] objectAtIndex:0];
NSString * langonly = [[langplusreg componentsSeparatedByString:@"-"] 

In my case i just wanted only Locale language not locale region.

Output: If your Locale language is Japanese and locale region is Japan then:

langplusreg = ja-JP

langonly = ja

PHP Warning Permission denied (13) on session_start()

I have had this issue before, you need more than the standard 755 or 644 permission to store the $_SESSION information. You need to be able to write to that file as that is how it remembers.

How do files get into the External Dependencies in Visual Studio C++?

The External Dependencies folder is populated by IntelliSense: the contents of the folder do not affect the build at all (you can in fact disable the folder in the UI).

You need to actually include the header (using a #include directive) to use it. Depending on what that header is, you may also need to add its containing folder to the "Additional Include Directories" property and you may need to add additional libraries and library folders to the linker options; you can set all of these in the project properties (right click the project, select Properties). You should compare the properties with those of the project that does build to determine what you need to add.

Should I use "camel case" or underscores in python?

PEP 8 advises the first form for readability. You can find it here.

Function names should be lowercase, with words separated by underscores as necessary to improve readability.

Regular expression to match a line that doesn't contain a word

FWIW, since regular languages (aka rational languages) are closed under complementation, it's always possible to find a regular expression (aka rational expression) that negates another expression. But not many tools implement this.

Vcsn supports this operator (which it denotes {c}, postfix).

You first define the type of your expressions: labels are letter (lal_char) to pick from a to z for instance (defining the alphabet when working with complementation is, of course, very important), and the "value" computed for each word is just a Boolean: true the word is accepted, false, rejected.

In Python:

In [5]: import vcsn
        c = vcsn.context('lal_char(a-z), b')
Out[5]: {a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z} ? 

then you enter your expression:

In [6]: e = c.expression('(hede){c}'); e
Out[6]: (hede)^c

convert this expression to an automaton:

In [7]: a = e.automaton(); a

The corresponding automaton

finally, convert this automaton back to a simple expression.

In [8]: print(a.expression())

where + is usually denoted |, \e denotes the empty word, and [^] is usually written . (any character). So, with a bit of rewriting ()|h(ed?)?|([^h]|h([^e]|e([^d]|d([^e]|e.)))).*.

You can see this example here, and try Vcsn online there.

Populating Spring @Value during Unit Test

Since Spring 4.1 you could set up property values just in code by using org.springframework.test.context.TestPropertySource annotation on Unit Tests class level. You could use this approach even for injecting properties into dependent bean instances

For example

@ContextConfiguration(classes = FooTest.Config.class)
@TestPropertySource(properties = {
public class FooTest {

  String bar;

  public void testValueSetup() {
    assertEquals("testValue", bar);

  static class Config {

    public static PropertySourcesPlaceholderConfigurer propertiesResolver() {
        return new PropertySourcesPlaceholderConfigurer();



Note: It's necessary to have instance of in Spring context

Edit 24-08-2017: If you are using SpringBoot 1.4.0 and later you could initialize tests with @SpringBootTest and @SpringBootConfiguration annotations. More info here

In case of SpringBoot we have following code

@TestPropertySource(properties = {
public class FooTest {

  String bar;

  public void testValueSetup() {
    assertEquals("testValue", bar);


Why should we NOT use sys.setdefaultencoding("utf-8") in a py script?


The answer is NEVER! (unless you really know what you're doing)

9/10 times the solution can be resolved with a proper understanding of encoding/decoding.

1/10 people have an incorrectly defined locale or environment and need to set:


in their environment to fix console printing problems.

What does it do?

sys.setdefaultencoding("utf-8") (struck through to avoid re-use) changes the default encoding/decoding used whenever Python 2.x needs to convert a Unicode() to a str() (and vice-versa) and the encoding is not given. I.e:


In Python 2.x, the default encoding is set to ASCII and the above examples will fail with:

UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 0: ordinal not in range(128)

(My console is configured as UTF-8, so "€" = '\xe2\x82\xac', hence exception on \xe2)


UnicodeEncodeError: 'ascii' codec can't encode character u'\u20ac' in position 0: ordinal not in range(128)

sys.setdefaultencoding("utf-8") will allow these to work for me, but won't necessarily work for people who don't use UTF-8. The default of ASCII ensures that assumptions of encoding are not baked into code


sys.setdefaultencoding("utf-8") also has a side effect of appearing to fix sys.stdout.encoding, used when printing characters to the console. Python uses the user's locale (Linux/OS X/Un*x) or codepage (Windows) to set this. Occasionally, a user's locale is broken and just requires PYTHONIOENCODING to fix the console encoding.


$ export LANG=en_GB.gibberish
$ python
>>> import sys
>>> sys.stdout.encoding
>>> print u"\u20AC"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec can't encode character u'\u20ac' in position 0: ordinal not in range(128)
>>> exit()

>>> import sys
>>> sys.stdout.encoding
>>> print u"\u20AC"

What's so bad with sys.setdefaultencoding("utf-8")?

People have been developing against Python 2.x for 16 years on the understanding that the default encoding is ASCII. UnicodeError exception handling methods have been written to handle string to Unicode conversions on strings that are found to contain non-ASCII.


def welcome_message(byte_string):
        return u"%s runs your business" % byte_string
    except UnicodeError:
        return u"%s runs your business" % unicode(byte_string,

print(welcome_message(u"Angstrom (Å®)".encode("latin-1"))

Previous to setting defaultencoding this code would be unable to decode the “Å” in the ascii encoding and then would enter the exception handler to guess the encoding and properly turn it into unicode. Printing: Angstrom (Å®) runs your business. Once you’ve set the defaultencoding to utf-8 the code will find that the byte_string can be interpreted as utf-8 and so it will mangle the data and return this instead: Angstrom (U) runs your business.

Changing what should be a constant will have dramatic effects on modules you depend upon. It's better to just fix the data coming in and out of your code.

Example problem

While the setting of defaultencoding to UTF-8 isn't the root cause in the following example, it shows how problems are masked and how, when the input encoding changes, the code breaks in an unobvious way: UnicodeDecodeError: 'utf8' codec can't decode byte 0x80 in position 3131: invalid start byte

E: gnupg, gnupg2 and gnupg1 do not seem to be installed, but one of them is required for this operation

I have debian 9 and to fix this i used the new library as follows:

ln -s /usr/bin/gpgv /usr/bin/gnupg2

Regex: match everything but specific pattern

You can put a ^ in the beginning of a character set to match anything but those characters.


will match everything but =

How to hide collapsible Bootstrap 4 navbar on click

this is the solution to close menu when click on anchor then apply this line in list item

     data-target="#sidenav-collapse-main" data-toggle="collapse"

the real example that work for me is below

      <li class="nav-item" data-target="#sidenav-collapse-main" data- 
      toggle="collapse" >
      <a class="nav-link" routerLinkActive="active" routerLink="/admin/users">
        <i class="ni ni-single-02  text-orange"></i> Users

Windows batch script to unhide files hidden by virus

Try this one. Hope this is working fine.. :)

@ECHO off



set drvltr=

set /p drvltr=Enter Drive letter: 

attrib -s -h -a /s /d  %drvltr%:\*.*

ECHO Unhide Completed


Converting string to title case

Recently I found a better solution.

If your text contains every letter in uppercase, then TextInfo will not convert it to the proper case. We can fix that by using the lowercase function inside like this:

public static string ConvertTo_ProperCase(string text)
    TextInfo myTI = new CultureInfo("en-US", false).TextInfo;
    return myTI.ToTitleCase(text.ToLower());

Now this will convert everything that comes in to Propercase.

How can I convert an image into Base64 string using JavaScript?

You could use FileAPI, but it's pretty much unsupported.

Check if an object belongs to a class in Java

If you ever need to do this dynamically, you can use the following:

boolean isInstance(Object object, Class<?> type) {
    return type.isInstance(object);

You can get an instance of java.lang.Class by calling the instance method Object::getClass on any object (returns the Class which that object is an instance of), or you can do class literals (for example, String.class, List.class, int[].class). There are other ways as well, through the reflection API (which Class itself is the entry point for).

Conda version pip install -r requirements.txt --target ./lib

A quick search on the conda official docs will help you to find what each flag does.

So far:

  • -y: Do not ask for confirmation.
  • -f: I think it should be --file, so it read package versions from the given file.
  • -q: Do not display progress bar.
  • -c: Additional channel to search for packages. These are URLs searched in the order

JsonMappingException: No suitable constructor found for type [simple type, class ]: can not instantiate from JSON object

Generally, this error comes because we don’t make default constructor.
But in my case:
The issue was coming only due to I have made used object class inside parent class.
This has wasted my whole day.

jQuery: select all elements of a given class, except for a particular Id

Use the :not selector.


If you have multiple ids or selectors just use the comma delimiter, in addition:


AngularJS : How to watch service variables?

You can always use the good old observer pattern if you want to avoid the tyranny and overhead of $watch.

In the service:

factory('aService', function() {
  var observerCallbacks = [];

  //register an observer
  this.registerObserverCallback = function(callback){

  //call this when you know 'foo' has been changed
  var notifyObservers = function(){
    angular.forEach(observerCallbacks, function(callback){

  //example of when you may want to notify observers = someNgResource.query().$then(function(){

And in the controller:

function FooCtrl($scope, aService){
  var updateFoo = function(){
    $ =;

  //service now in control of updating foo

How can I convert a string to boolean in JavaScript?

why don't you try something like this


It will return an error when some other text is given rather than true or false regardless of the case and it will capture the numbers also as

// 0-> false
// any other number -> true

Netbeans 8.0.2 The module has not been deployed

Sometimes this happens because some library that you put in your code there isn't added, verify all libraries that you are using.

To add a new library in netbean:

  • Rigth click in libraries folder.
  • Click in add library.
  • Select the library that you need in Available Libraries, or import it from Global Libraries (clicking in Import button).
  • Finally click in Add library to be sure that your library is added.

How to initialize std::vector from C-style array?

You use the word initialize so it's unclear if this is one-time assignment or can happen multiple times.

If you just need a one time initialization, you can put it in the constructor and use the two iterator vector constructor:

Foo::Foo(double* w, int len) : w_(w, w + len) { }

Otherwise use assign as previously suggested:

void set_data(double* w, int len)
    w_.assign(w, w + len);

AFNetworking Post Request

[SVProgressHUD setDefaultMaskType:SVProgressHUDMaskTypeGradient];
[SVProgressHUD show];

NSDictionary *dictParam =@{@"user_id":@"31"};// Add perameter

NSString *URLString =@"your url string";

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
[manager setResponseSerializer:[AFHTTPResponseSerializer serializer]];
[manager.requestSerializer setValue:strGlobalLoginToken forHTTPHeaderField:@"Authorization"];//strGlobalLoginToken is your login token
//         [manager.requestSerializer setValue:setHeaderEnv forHTTPHeaderField:@"Env"];
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript",@"text/html",@"text/plain",@"application/rss+xml", nil];
[manager POST:URLString parameters:dictParam progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject)

     NSDictionary *response = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:nil];

     NSLog(@"Response DICT:%@",response);

     if ([[[[response objectForKey:@"response"] objectAtIndex:0] objectForKey:@"status"] isEqualToString:@"true"])

         for (NSMutableDictionary *dicAll in [[[response objectForKey:@"response"]objectAtIndex:0]objectForKey:@"plans"])
             [yourNsmutableArray addObject:[dicAll mutableCopy]];
         //yourNsmutableArray Nsmutablearray  alloction in view didload

         NSLog(@"yourNsmutableArray  %@",yourNsmutableArray);

     [SVProgressHUD dismiss];

 } failure:^(NSURLSessionDataTask  *_Nullable task, NSError  *_Nonnull error)
     NSLog(@"RESPONSE STRING:%@",task.response);
     NSLog(@"error userInfo:%@",error.userInfo);

     NSString *errResponse = [[NSString alloc] initWithData:(NSData *)error.userInfo[AFNetworkingOperationFailingURLResponseDataErrorKey] encoding:NSUTF8StringEncoding];
     NSLog(@"URLString :--->>   %@ Error********* %@",URLString,errResponse);

     [SVProgressHUD dismiss];


How to get the 'height' of the screen using jquery


To set anything in the middle you can use CSS.

    position: absolute;
    left: 50%;
    top: 50%;
    width: 300px;
    height: 400px;
    margin-left: -150px;
    margin-top: -200px;
<div id="divCentre">I am at the centre</div>

How to get next/previous record in MySQL?

I had the same problem as Dan, so I used his answer and improved it.

First select the row index, nothing different here.

(SELECT @rownum:=@rownum+1 row, a.* 
FROM articles a, (SELECT @rownum:=0) r
ORDER BY date, id) as article_with_rows
WHERE id = 50;

Now use two separate queries. For example if the row index is 21, the query to select the next record will be:

FROM articles
ORDER BY date, id
LIMIT 21, 1

To select the previous record use this query:

FROM articles
ORDER BY date, id
LIMIT 19, 1

Keep in mind that for the first row (row index is 1), the limit will go to -1 and you will get a MySQL error. You can use an if-statement to prevent this. Just don't select anything, since there is no previous record anyway. In the case of the last record, there will be next row and therefor there will be no result.

Also keep in mind that if you use DESC for ordering, instead of ASC, you queries to select the next and previous rows are still the same, but switched.

Get the second highest value in a MySQL table

simple solution


Note: n = total number of records in column

  x = value 2nd, 3rd, 4th highest etc


//to find employee with 7th highest salary

n = 100
x = 7

SELECT * FROM tbl_employee ORDER BY salary ASC LIMIT 93, 1

hope this helps

Makefile to compile multiple C programs?

A simple program's compilation workflow is simple, I can draw it as a small graph: source -> [compilation] -> object [linking] -> executable. There are files (source, object, executable) in this graph, and rules (make's terminology). That graph is definied in the Makefile.

When you launch make, it reads Makefile, and checks for changed files. If there's any, it triggers the rule, which depends on it. The rule may produce/update further files, which may trigger other rules and so on. If you create a good makefile, only the necessary rules (compiler/link commands) will run, which stands "to next" from the modified file in the dependency path.

Pick an example Makefile, read the manual for syntax (anyway, it's clear for first sight, w/o manual), and draw the graph. You have to understand compiler options in order to find out the names of the result files.

The make graph should be as complex just as you want. You can even do infinite loops (don't do)! You can tell make, which rule is your target, so only the left-standing files will be used as triggers.

Again: draw the graph!.

Android Material Design Button Styles

I will add my answer since I don't use any of the other answers provided.

With the Support Library v7, all the styles are actually already defined and ready to use, for the standard buttons, all of these styles are available:


Widget.AppCompat.Button: enter image description here

Widget.AppCompat.Button.Colored: enter image description here

Widget.AppCompat.Button.Borderless enter image description here

Widget.AppCompat.Button.Borderless.Colored: enter image description here

To answer the question, the style to use is therefore

<Button style="@style/Widget.AppCompat.Button.Colored"

How to change the color

For the whole app:

The color of all the UI controls (not only buttons, but also floating action buttons, checkboxes etc.) is managed by the attribute colorAccent as explained here. You can modify this style and apply your own color in your theme definition:

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="colorAccent">@color/Orange</item>

For a specific button:

If you need to change the style of a specific button, you can define a new style, inheriting one of the parent styles described above. In the example below I just changed the background and font colors:

<style name="AppTheme.Button" parent="Widget.AppCompat.Button.Colored">
    <item name="colorButtonNormal">@color/Red</item>
    <item name="android:textColor">@color/White</item>

Then you just need to apply this new style on the button with:


To set a default button design in a layout, add this line to the styles.xml theme:

<item name="buttonStyle">@style/btn</item>

where @style/btn is your button theme. This sets the button style for all the buttons in a layout with a specific theme

Why is list initialization (using curly braces) better than the alternatives?

There are already great answers about the advantages of using list initialization, however my personal rule of thumb is NOT to use curly braces whenever possible, but instead make it dependent on the conceptual meaning:

  • If the object I'm creating conceptually holds the values I'm passing in the constructor (e.g. containers, POD structs, atomics, smart pointers etc.), then I'm using the braces.
  • If the constructor resembles a normal function call (it performs some more or less complex operations that are parametrized by the arguments) then I'm using the normal function call syntax.
  • For default initialization I always use curly braces.
    For one, that way I'm always sure that the object gets initialized irrespective of whether it e.g. is a "real" class with a default constructor that would get called anyway or a builtin / POD type. Second it is - in most cases - consistent with the first rule, as a default initialized object often represents an "empty" object.

In my experience, this ruleset can be applied much more consistently than using curly braces by default, but having to explicitly remember all the exceptions when they can't be used or have a different meaning than the "normal" function-call syntax with parenthesis (calls a different overload).

It e.g. fits nicely with standard library-types like std::vector:

vector<int> a{10,20};   //Curly braces -> fills the vector with the arguments

vector<int> b(10,20);   //Parentheses -> uses arguments to parametrize some functionality,                          
vector<int> c(it1,it2); //like filling the vector with 10 integers or copying a range.

vector<int> d{};      //empty braces -> default constructs vector, which is equivalent
                      //to a vector that is filled with zero elements

psql: FATAL: role "postgres" does not exist

This is the only one that fixed it for me :

createuser -s -U $USER

Getting number of elements in an iterator in Python

It's common practice to put this type of information in the file header, and for pysam to give you access to this. I don't know the format, but have you checked the API?

As others have said, you can't know the length from the iterator.

Firebase: how to generate a unique numeric ID for key?

Use transactions and keep a number in the database somewhere that you can increase by one. This way you can get a nice numeric and simple id.

How to make an array of arrays in Java

Like this:

String[][] arrays = { array1, array2, array3, array4, array5 };


String[][] arrays = new String[][] { array1, array2, array3, array4, array5 };

(The latter syntax can be used in assignments other than at the point of the variable declaration, whereas the shorter syntax only works with declarations.)

How to get difference between two rows for a column field?

Does SQL Server support analytic functions?

select   rowint,
         value - lag(value) over (order by rowint) diff
from     myTable
order by rowint

ERROR in ./node_modules/css-loader?

My case:

Missing node-sass in package.json


  1. npm i --save node-sass@latest
  2. remove node-modules folder
  3. npm i
  4. check "@angular-devkit/build-angular": "^0.901.0" version in package.json

How do I set response headers in Flask?

You can do this pretty easily:

def home():
    resp = flask.Response("Foo bar baz")
    resp.headers['Access-Control-Allow-Origin'] = '*'
    return resp

Look at flask.Response and flask.make_response()

But something tells me you have another problem, because the after_request should have handled it correctly too.

I just noticed you are already using make_response which is one of the ways to do it. Like I said before, after_request should have worked as well. Try hitting the endpoint via curl and see what the headers are:

curl -i

You should see

> curl -i ''
HTTP/1.0 200 OK
Content-Type: text/html; charset=utf-8
Content-Length: 11
Access-Control-Allow-Origin: *
Server: Werkzeug/0.8.3 Python/2.7.5
Date: Tue, 16 Sep 2014 03:47:13 GMT

Noting the Access-Control-Allow-Origin header.

As I suspected, you are getting a 500 so you are not setting the header like you thought. Try adding app.debug = True before you start the app and try again. You should get some output showing you the root cause of the problem.

For example:

def home():
    resp = flask.Response("Foo bar baz")
    user.weapon = boomerang
    resp.headers['Access-Control-Allow-Origin'] = '*'
    return resp

Gives a nicely formatted html error page, with this at the bottom (helpful for curl command)

Traceback (most recent call last):
  File "/private/tmp/", line 8, in home
    user.weapon = boomerang
NameError: global name 'boomerang' is not defined

Add column in dataframe from list

IIUC, if you make your (unfortunately named) List into an ndarray, you can simply index into it naturally.

>>> import numpy as np
>>> m = np.arange(16)*10
>>> m[df.A]
array([  0,  40,  50,  60, 150, 150, 140, 130])
>>> df["D"] = m[df.A]
>>> df
    A   B   C    D
0   0 NaN NaN    0
1   4 NaN NaN   40
2   5 NaN NaN   50
3   6 NaN NaN   60
4  15 NaN NaN  150
5  15 NaN NaN  150
6  14 NaN NaN  140
7  13 NaN NaN  130

Here I built a new m, but if you use m = np.asarray(List), the same thing should work: the values in df.A will pick out the appropriate elements of m.

Note that if you're using an old version of numpy, you might have to use m[df.A.values] instead-- in the past, numpy didn't play well with others, and some refactoring in pandas caused some headaches. Things have improved now.

How can I provide multiple conditions for data trigger in WPF?


If you wanna implement the AND logic, you should use MultiTrigger, here is an example:

Suppose we want to do some actions if the property Text="" (empty string) AND IsKeyboardFocused="False", then your code should look like the following:

        <Condition Property="Text" Value="" />
        <Condition Property="IsKeyboardFocused" Value="False" />
            <!-- Your actions here -->

If you wanna implement the OR logic, there are couple of ways, and it depends on what you try to do:

The first option is to use multiple Triggers.
So, suppose you wanna do something if either Text="" OR IsKeyboardFocused="False",
then your code should look something like this:

<Trigger Property="IsEnabled" Value="false">
    <Setter Property="Opacity" TargetName="border" Value="0.56"/>
<Trigger Property="IsMouseOver" Value="true">
    <Setter Property="BorderBrush" TargetName="border" 
            Value="{StaticResource TextBox.MouseOver.Border}"/>

But the problem in this is what will I do if i wanna do something if either Text ISN'T null OR IsKeyboard="True"? This can be achieved by the second approach:
Recall De Morgan's rule, that says !(!x && !y) = x || y.
So we'll use it to solve the previous problem, by writing a multi trigger that it's triggered when Text="" and IsKeyboard="True", and we'll do our actions in EXIT ACTIONS, like this:

        <Condition Property="Text" Value="" />
        <Condition Property="IsKeyboardFocused" Value="False" />
        <!-- Do something here -->

Nginx reverse proxy causing 504 Gateway Timeout

If you want to increase or add time limit to all sites then you can add below lines to the nginx.conf file.

Add below lines to the http section of /usr/local/etc/nginx/nginx.conf or /etc/nginx/nginx.conf file.

fastcgi_read_timeout 600;
proxy_read_timeout 600;

If the above lines doesn't exist in conf file then add them, otherwise increase fastcgi_read_timeout and proxy_read_timeout to make sure that nginx and php-fpm did not timeout.

To increase time limit for only one site then you can edit in vim /etc/nginx/sites-available/

location ~ \.php$ {
    include /etc/nginx/fastcgi_params;
        fastcgi_pass  unix:/var/run/php5-fpm.sock;
    fastcgi_read_timeout 300; 

and after adding these lines in nginx.conf, then don't forget to restart nginx.

service php7-fpm reload 
service nginx reload

or, if you're using valet then simply type valet restart.

Java Swing - how to show a panel on top of another panel?

There's another layout manager that may be of interest here: Overlay Layout Here's a simple tutorial: OverlayLayout: for layout management of components that lie on top of one another. Overlay Layout allows you to position panels on top of one another, and set a layout inside each panel. You are also able to set size and position of each panel separately.

(The reason I'm answering this question from years ago is because I have stumbled upon the same problem, and I have seen very few mentions of the Overlay Layout on StackOverflow, while it seems to be pretty well documented. Hopefully this may help someone else who keeps searching for it.)

laravel collection to array

Try this:

$comments_collection = $post->comments()->get()->toArray();

see this can help you
toArray() method in Collections