SyntaxFix

Programs & Examples On #Game engine

A game engine is a software framework used in the development of video games. TAG USAGE NOTE: Use this tag only if you are creating or modifying a game engine framework, or if the game engine you use doesn't yet have its own tag on StackOverflow. Otherwise use the engine-specific tag(s).

Component based game engine design

While not a complete tutorial on the subject of game engine design, I have found that this page has some good detail and examples on use of the component architecture for games.

2D cross-platform game engine for Android and iOS?

I find a nice and tidy Wave game engine few days ago. It uses C# and have Windows Phone and Windows Store converters as well which makes it a great replacement of XNA for me

onclick or inline script isn't working in extension

Reason

This does not work, because Chrome forbids any kind of inline code in extensions via Content Security Policy.

Inline JavaScript will not be executed. This restriction bans both inline <script> blocks and inline event handlers (e.g. <button onclick="...">).

How to detect

If this is indeed the problem, Chrome would produce the following error in the console:

Refused to execute inline script because it violates the following Content Security Policy directive: "script-src 'self' chrome-extension-resource:". Either the 'unsafe-inline' keyword, a hash ('sha256-...'), or a nonce ('nonce-...') is required to enable inline execution.

To access a popup's JavaScript console (which is useful for debug in general), right-click your extension's button and select "Inspect popup" from the context menu.

More information on debugging a popup is available here.

How to fix

One needs to remove all inline JavaScript. There is a guide in Chrome documentation.

Suppose the original looks like:

<a onclick="handler()">Click this</a> <!-- Bad -->

One needs to remove the onclick attribute and give the element a unique id:

<a id="click-this">Click this</a> <!-- Fixed -->

And then attach the listener from a script (which must be in a .js file, suppose popup.js):

// Pure JS:
document.addEventListener('DOMContentLoaded', function() {
  document.getElementById("click-this").addEventListener("click", handler);
});

// The handler also must go in a .js file
function handler() {
  /* ... */
}

Note the wrapping in a DOMContentLoaded event. This ensures that the element exists at the time of execution. Now add the script tag, for instance in the <head> of the document:

<script src="popup.js"></script>

Alternative if you're using jQuery:

// jQuery
$(document).ready(function() {
  $("#click-this").click(handler);
});

Relaxing the policy

Q: The error mentions ways to allow inline code. I don't want to / can't change my code, how do I enable inline scripts?

A: Despite what the error says, you cannot enable inline script:

There is no mechanism for relaxing the restriction against executing inline JavaScript. In particular, setting a script policy that includes 'unsafe-inline' will have no effect.

Update: Since Chrome 46, it's possible to whitelist specific inline code blocks:

As of Chrome 46, inline scripts can be whitelisted by specifying the base64-encoded hash of the source code in the policy. This hash must be prefixed by the used hash algorithm (sha256, sha384 or sha512). See Hash usage for <script> elements for an example.

However, I do not readily see a reason to use this, and it will not enable inline attributes like onclick="code".

Why do I get "warning longer object length is not a multiple of shorter object length"?

I had a similar issue and using %in% operator instead of the == (equality) operator was the solution:

# %in%

Hope it helps.

Why is "npm install" really slow?

install nvm and try it should help, use below command:-

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.2/install.sh | bash

Python, Pandas : write content of DataFrame into text File

Late to the party: Try this>

base_filename = 'Values.txt'
with open(os.path.join(WorkingFolder, base_filename),'w') as outfile:
    df.to_string(outfile)
#Neatly allocate all columns and rows to a .txt file

Permission denied on accessing host directory in Docker

See this Project Atomic blog post about Volumes and SELinux for the full story.

Specifically:

This got easier recently since Docker finally merged a patch which will be showing up in docker-1.7 (We have been carrying the patch in docker-1.6 on RHEL, CentOS, and Fedora).

This patch adds support for "z" and "Z" as options on the volume mounts (-v).

For example:

docker run -v /var/db:/var/db:z rhel7 /bin/sh

Will automatically do the chcon -Rt svirt_sandbox_file_t /var/db described in the man page.

Even better, you can use Z.

docker run -v /var/db:/var/db:Z rhel7 /bin/sh

This will label the content inside the container with the exact MCS label that the container will run with, basically it runs chcon -Rt svirt_sandbox_file_t -l s0:c1,c2 /var/db where s0:c1,c2 differs for each container.

PHP MySQL Google Chart JSON - Complete Example

You can do this more easy way. And 100% works that you want

<?php
    $servername = "localhost";
    $username = "root";
    $password = "";  //your database password
    $dbname = "demo";  //your database name

    $con = new mysqli($servername, $username, $password, $dbname);

    if ($con->connect_error) {
        die("Connection failed: " . $con->connect_error);
    }
    else
    {
        //echo ("Connect Successfully");
    }
    $query = "SELECT Date_time, Tempout FROM alarm_value"; // select column
    $aresult = $con->query($query);

?>

<!DOCTYPE html>
<html>
<head>
    <title>Massive Electronics</title>
    <script type="text/javascript" src="loder.js"></script>
    <script type="text/javascript">
        google.charts.load('current', {'packages':['corechart']});

        google.charts.setOnLoadCallback(drawChart);
        function drawChart(){
            var data = new google.visualization.DataTable();
            var data = google.visualization.arrayToDataTable([
                ['Date_time','Tempout'],
                <?php
                    while($row = mysqli_fetch_assoc($aresult)){
                        echo "['".$row["Date_time"]."', ".$row["Tempout"]."],";
                    }
                ?>
               ]);

            var options = {
                title: 'Date_time Vs Room Out Temp',
                curveType: 'function',
                legend: { position: 'bottom' }
            };

            var chart = new google.visualization.AreaChart(document.getElementById('areachart'));
            chart.draw(data, options);
        }

    </script>
</head>
<body>
     <div id="areachart" style="width: 900px; height: 400px"></div>
</body>
</html>

loder.js link here loder.js

How can I find the location of origin/master in git, and how do I change it?

I thought my laptop was the origin…

That’s kind of nonsensical: origin refers to the default remote repository – the one you usually fetch/pull other people’s changes from.

How can I:

  1. git remote -v will show you what origin is; origin/master is your “bookmark” for the last known state of the master branch of the origin repository, and your own master is a tracking branch for origin/master. This is all as it should be.

  2. You don’t. At least it makes no sense for a repository to be the default remote repository for itself.

  3. It isn’t. It’s merely telling you that you have made so-and-so many commits locally which aren’t in the remote repository (according to the last known state of that repository).

Service will not start: error 1067: the process terminated unexpectedly

This error message appears if the Windows service launcher has quit immediately after being started. This problem usually happens because the license key has not been correctly deployed(license.txt file in the license folder). If service is not strtign with correct key, just put incorrect key and try to start. Once started, place the correct key, it will work.

XmlSerializer giving FileNotFoundException at constructor

Just as reference. Taking from D-B answer and comments, I came with this solution which is close to D-B solution. It works fine in all of my cases and it is thread safe. I don't think that using a ConcurrentDictionary would have been ok.

using System;
using System.Collections.Generic;
using System.Xml.Serialization;

namespace HQ.Util.General
{
    public class XmlSerializerHelper
    {
        private static readonly Dictionary<Type, XmlSerializer> _dictTypeToSerializer = new Dictionary<Type, XmlSerializer>();

        public static XmlSerializer GetSerializer(Type type)
        {
            lock (_dictTypeToSerializer)
            {
                XmlSerializer serializer;
                if (! _dictTypeToSerializer.TryGetValue(type, out serializer))
                {
                    var importer = new XmlReflectionImporter();
                    var mapping = importer.ImportTypeMapping(type, null, null);
                    serializer = new XmlSerializer(mapping);
                    return _dictTypeToSerializer[type] = serializer;
                }

                return serializer;
            }
        }
    }
}

Usage:

        if (File.Exists(Path))
        {
            using (XmlTextReader reader = new XmlTextReader(Path))
            {
                // XmlSerializer x  = new XmlSerializer(typeof(T));
                var x = XmlSerializerHelper.GetSerializer(typeof(T));

                try
                {
                    options = (OptionsBase<T>)x.Deserialize(reader);
                }
                catch (Exception ex)
                {
                    Log.Instance.AddEntry(LogType.LogException, "Unable to open Options file: " + Path, ex);
                }
            }
        }

Cannot create Maven Project in eclipse

I am using Spring STS 3.8.3. I had a similar problem. I fixed it by using information from this thread And also by fixing some maven settings. click Spring Tool Suite -> Preferences -> Maven and uncheck the box that says "Do not automatically update dependencies from remote depositories" Also I checked the boxes that say "Download Artifact Sources" and "download Artifact javadoc".

Concatenate two string literals

Your second example does not work because there is no operator + for two string literals. Note that a string literal is not of type string, but instead is of type const char *. Your second example will work if you revise it like this:

const string message = string("Hello") + ",world" + exclam;

Change Primary Key

Sometimes when we do these steps:

 alter table my_table drop constraint my_pk; 
 alter table my_table add constraint my_pk primary key (city_id, buildtime, time);

The last statement fails with

ORA-00955 "name is already used by an existing object"

Oracle usually creates an unique index with the same name my_pk. In such a case you can drop the unique index or rename it based on whether the constraint is still relevant.

You can combine the dropping of primary key constraint and unique index into a single sql statement:

alter table my_table drop constraint my_pk drop index;

check this: ORA-00955 "name is already used by an existing object"

Get clicked element using jQuery on event?

As simple as it can be

Use $(this) here too

$(document).on("click",".appDetails", function () {
   var clickedBtnID = $(this).attr('id'); // or var clickedBtnID = this.id
   alert('you clicked on button #' + clickedBtnID);
});

Error while inserting date - Incorrect date value:

I had a different cause for this error. I tried to insert a date without using quotes and received a strange error telling me I had tried to insert a date from 2003.

My error message:

Although I was already using the YYYY-MM-DD format, I forgot to add quotes around the date. Even though it is a date and not a string, quotes are still required.

How to show validation message below each textbox using jquery?

Here you go:

JS:

$('form').on('submit', function (e) {
    e.preventDefault();

    if (!$('#email').val()) 
        $('#email').parent().append('<span class="error">Please enter your email address.</span>');


    if(!$('#password').val())
         $('#password').parent().append('<span class="error">Please enter your password.</span>');
});

CSS:

@charset "utf-8";
/* CSS Document */

/* ---------- FONTAWESOME ---------- */
/* ---------- http://fortawesome.github.com/Font-Awesome/ ---------- */
/* ---------- http://weloveiconfonts.com/ ---------- */

@import url(http://weloveiconfonts.com/api/?family=fontawesome);

/* ---------- ERIC MEYER'S RESET CSS ---------- */
/* ---------- http://meyerweb.com/eric/tools/css/reset/ ---------- */

@import url(http://meyerweb.com/eric/tools/css/reset/reset.css);

/* ---------- FONTAWESOME ---------- */

[class*="fontawesome-"]:before {
  font-family: 'FontAwesome', sans-serif;
}

/* ---------- GENERAL ---------- */

body {
    background-color: #C0C0C0;
    color: #000;
    font-family: "Varela Round", Arial, Helvetica, sans-serif;
    font-size: 16px;
    line-height: 1.5em;
}

input {
    border: none;
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
    line-height: inherit;
    -webkit-appearance: none;
}

/* ---------- LOGIN ---------- */

#login {
    margin: 50px auto;
    width: 400px;
}

#login h2 {
    background-color: #f95252;
    -webkit-border-radius: 20px 20px 0 0;
    -moz-border-radius: 20px 20px 0 0;
    border-radius: 20px 20px 0 0;
    color: #fff;
    font-size: 28px;
    padding: 20px 26px;
}

#login h2 span[class*="fontawesome-"] {
    margin-right: 14px;
}

#login fieldset {
    background-color: #fff;
    -webkit-border-radius: 0 0 20px 20px;
    -moz-border-radius: 0 0 20px 20px;
    border-radius: 0 0 20px 20px;
    padding: 20px 26px;
}

#login fieldset div {
    color: #777;
    margin-bottom: 14px;
}

#login fieldset p:last-child {
    margin-bottom: 0;
}

#login fieldset input {
    -webkit-border-radius: 3px;
    -moz-border-radius: 3px;
    border-radius: 3px;
}

#login fieldset .error {
    display: block;
     color: #FF1000;
    font-size: 12px;
}
}

#login fieldset input[type="email"], #login fieldset input[type="password"] {
    background-color: #eee;
    color: #777;
    padding: 4px 10px;
    width: 328px;
}

#login fieldset input[type="submit"] {
    background-color: #33cc77;
    color: #fff;
    display: block;
    margin: 0 auto;
    padding: 4px 0;
    width: 100px;
}

#login fieldset input[type="submit"]:hover {
    background-color: #28ad63;
}

HTML: 

<div id="login">

<h2><span class="fontawesome-lock"></span>Sign In</h2>

<form action="javascript:void(0);" method="POST">

    <fieldset>

        <div><label for="email">E-mail address</label></div>
        <div><input type="email" id="email" /></div>

        <div><label for="password">Password</label></div>
        <div><input type="password" id="password" /></div> <!-- JS because of IE support; better: placeholder="Email" -->

        <div><input type="submit" value="Sign In"></div>

    </fieldset>

</form>

And the fiddle: jsfiddle

How to compare dates in Java?

Use getTime() to get the numeric value of the date, and then compare using the returned values.

Get HTML inside iframe using jQuery

This can be another solution if jquery is loaded in iframe.html. 

$('#iframe')[0].contentWindow.$("html").html()

How do I schedule jobs in Jenkins?

The steps for schedule jobs in Jenkins:

  1. click on "Configure" of the job requirement
  2. scroll down to "Build Triggers" - subtitle
  3. Click on the checkBox of Build periodically
  4. Add time schedule in the Schedule field, for example, @midnight

enter image description here

Note: under the schedule field, can see the last and the next date-time run.

Jenkins also supports predefined aliases to schedule build:

@hourly, @daily, @weekly, @monthly, @midnight

@hourly --> Build every hour at the beginning of the hour --> 0 * * * *

@daily, @midnight --> Build every day at midnight --> 0 0 * * *

@weekly --> Build every week at midnight on Sunday morning --> 0 0 * * 0

@monthly --> Build every month at midnight of the first day of the month --> 0 0 1 * *

How to run composer from anywhere?

For running it from other location you can use the composer program that come with the program. It is basically a bash script. If you don't have it you can create one by simply copying the following code into a text file

#!/bin/sh

dir=$(d=$(dirname "$0"); cd "$d" && pwd)

if command -v 'cygpath' >/dev/null 2>&1; then
  dir=$(cygpath -m $dir);
fi

dir=$(echo $dir | sed 's/ /\ /g')
php "${dir}/composer.phar" $*

Then save the file inside your bin folder and name it composer without any file extension. Then add the bin folder to your environment variable f

How do I run a program from command prompt as a different user and as an admin

Start -> shift + command Prompt right click will helps to use as another user or as Admin

How to have an automatic timestamp in SQLite?

If you use the SQLite DB-Browser you can change the default value in this way:

  1. Choose database structure
  2. select the table
  3. modify table
  4. in your column put under 'default value' the value: =(datetime('now','localtime'))

I recommend to make an update of your database before, because a wrong format in the value can lead to problems in the SQLLite Browser.

How can I check for NaN values?

How to remove NaN (float) item(s) from a list of mixed data types

If you have mixed types in an iterable, here is a solution that does not use numpy:

from math import isnan

Z = ['a','b', float('NaN'), 'd', float('1.1024')]

[x for x in Z if not (
                      type(x) == float # let's drop all float values…
                      and isnan(x) # … but only if they are nan
                      )]

['a', 'b', 'd', 1.1024]

Short-circuit evaluation means that isnan will not be called on values that are not of type 'float', as False and (…) quickly evaluates to False without having to evaluate the right-hand side.

LIKE vs CONTAINS on SQL Server

Also try changing from this:

    SELECT * FROM table WHERE Contains(Column, "test") > 0;

To this:

    SELECT * FROM table WHERE Contains(Column, '"*test*"') > 0;

The former will find records with values like "this is a test" and "a test-case is the plan".

The latter will also find records with values like "i am testing this" and "this is the greatest".

get current date with 'yyyy-MM-dd' format in Angular 4

If you only want to display then you can use date pipe in HTML like this :

Just Date:

your date | date: 'dd MMM yyyy'

Date With Time:

your date | date: 'dd MMM yyyy hh:mm a'

And if you want to take input only date from new Date() then :

You can use angular formatDate() in ts file like this -

currentDate = new Date();

const cValue = formatDate(currentDate, 'yyyy-MM-dd', 'en-US');

Setting HTTP headers

Set a proper golang middleware, so you can reuse on any endpoint.

Helper Type and Function

type Adapter func(http.Handler) http.Handler
// Adapt h with all specified adapters.
func Adapt(h http.Handler, adapters ...Adapter) http.Handler {
    for _, adapter := range adapters {
        h = adapter(h)
    }
    return h
}

Actual middleware

func EnableCORS() Adapter {
    return func(h http.Handler) http.Handler {
        return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

            if origin := r.Header.Get("Origin"); origin != "" {
                w.Header().Set("Access-Control-Allow-Origin", origin)
                w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE")
                w.Header().Set("Access-Control-Allow-Headers",
                    "Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
            }
            // Stop here if its Preflighted OPTIONS request
            if r.Method == "OPTIONS" {
                return
            }
            h.ServeHTTP(w, r)
        })
    }
}

Endpoint

REMEBER! Middlewares get applyed on reverse order( ExpectGET() gets fires first)

mux.Handle("/watcher/{action}/{device}",Adapt(api.SerialHandler(mux),
    api.EnableCORS(),
    api.ExpectGET(),
))

Conditional replacement of values in a data.frame

The R-inferno, or the basic R-documentation will explain why using df$* is not the best approach here. From the help page for "[" :

"Indexing by [ is similar to atomic vectors and selects a list of the specified element(s). Both [[ and $ select a single element of the list. The main difference is that $ does not allow computed indices, whereas [[ does. x$name is equivalent to x[["name", exact = FALSE]]. Also, the partial matching behavior of [[ can be controlled using the exact argument. "

I recommend using the [row,col] notation instead. Example: 

Rgames: foo   
         x    y z  
   [1,] 1e+00 1 0  
   [2,] 2e+00 2 0  
   [3,] 3e+00 1 0  
   [4,] 4e+00 2 0  
   [5,] 5e+00 1 0  
   [6,] 6e+00 2 0  
   [7,] 7e+00 1 0  
   [8,] 8e+00 2 0  
   [9,] 9e+00 1 0  
   [10,] 1e+01 2 0  
Rgames: foo<-as.data.frame(foo)

Rgames: foo[foo$y==2,3]<-foo[foo$y==2,1]
Rgames: foo
       x y     z
1  1e+00 1 0e+00
2  2e+00 2 2e+00
3  3e+00 1 0e+00
4  4e+00 2 4e+00
5  5e+00 1 0e+00
6  6e+00 2 6e+00
7  7e+00 1 0e+00
8  8e+00 2 8e+00
9  9e+00 1 0e+00
10 1e+01 2 1e+01

jquery get all form elements: input, textarea & select

The below code helps to get the details of elements from the specific form with the form id,

$('#formId input, #formId select').each(
    function(index){  
        var input = $(this);
        alert('Type: ' + input.attr('type') + 'Name: ' + input.attr('name') + 'Value: ' + input.val());
    }
);

The below code helps to get the details of elements from all the forms which are place in the loading page,

$('form input, form select').each(
    function(index){  
        var input = $(this);
        alert('Type: ' + input.attr('type') + 'Name: ' + input.attr('name') + 'Value: ' + input.val());
    }
);

The below code helps to get the details of elements which are place in the loading page even when the element is not place inside the tag,

$('input, select').each(
    function(index){  
        var input = $(this);
        alert('Type: ' + input.attr('type') + 'Name: ' + input.attr('name') + 'Value: ' + input.val());
    }
);

NOTE: We add the more element tag name what we need in the object list like as below,

Example: to get name of attribute "textarea",

$('input, select, textarea').each(
    function(index){  
        var input = $(this);
        alert('Type: ' + input.attr('type') + 'Name: ' + input.attr('name') + 'Value: ' + input.val());
    }
);

Postgresql: password authentication failed for user "postgres"

Once you are in your postgres shell, Enter this command

postgres=# \password postgres

After entering this command you will be prompted to set your password , just set the password and then try.

Python: Figure out local timezone

tzlocal from dateutil.

Code example follows. Last string suitable for use in filenames.

>>> from datetime import datetime
>>> from dateutil.tz import tzlocal
>>> str(datetime.now(tzlocal()))
'2015-04-01 11:19:47.980883-07:00'
>>> str(datetime.now(tzlocal())).replace(' ','-').replace(':','').replace('.','-')
'2015-04-01-111947-981879-0700'
>>>

adb command not found

if youd dont have adb in folder android-sdk-macosx/platform-tools/ you should install platform tools first. Run android-sdk-macosx/tools/android and Install platform tools from Android SDK manager.

Reverse a comparator in Java 8

Why not to extend the existing comperator and overwrite super and nor the result. The implementation the Comperator Interface is not nessesery but it makes it more clear what happens.

In result you get a easy reusable Class File, testable unit step and clear javadoc.

public class NorCoperator extends ExistingComperator implements Comparator<MyClass> {
    @Override
    public int compare(MyClass a, MyClass b) throws Exception {
        return super.compare(a, b)*-1;
    }
}

Position: absolute and parent height?

This is a late answer, but by looking at the source code, I noticed that when the video is fullscreen, the "mejs-container-fullscreen" class is added to the "mejs-container" element. It is thus possible to change the styling based on this class.

.mejs-container.mejs-container-fullscreen {
    // This rule applies only to the container when in fullscreen
    padding-top: 57%;
}

Also, if you wish to make your MediaElement video fluid using CSS, below is a great trick by Chris Coyier: http://css-tricks.com/rundown-of-handling-flexible-media/

Just add this to your CSS:

.mejs-container {
    width: 100% !important;
    height: auto !important;
    padding-top: 57%;
}
.mejs-overlay, .mejs-poster {
    width: 100% !important;
    height: 100% !important;
}
.mejs-mediaelement video {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    width: 100% !important;
    height: 100% !important;
}

I hope it helps.

How to find if element with specific id exists or not

 
 var myEle = document.getElementById("myElement");
    if(myEle){
        var myEleValue= myEle.value;
    }

the return of getElementById is null if an element is not actually present inside the dom, so your if statement will fail, because null is considered a false value

javascript: Disable Text Select

Just use this css method:

body{
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

You can find the same answer here: How to disable text selection highlighting using CSS?

throwing exceptions out of a destructor

I am in the group that considers that the "scoped guard" pattern throwing in the destructor is useful in many situations - particularly for unit tests. However, be aware that in C++11, throwing in a destructor results in a call to std::terminate since destructors are implicitly annotated with noexcept.

Andrzej Krzemienski has a great post on the topic of destructors that throw:

He points out that C++11 has a mechanism to override the default noexcept for destructors:

In C++11, a destructor is implicitly specified as noexcept. Even if you add no specification and define your destructor like this:

  class MyType {
        public: ~MyType() { throw Exception(); }            // ...
  };

The compiler will still invisibly add specification noexcept to your destructor. And this means that the moment your destructor throws an exception, std::terminate will be called, even if there was no double-exception situation. If you are really determined to allow your destructors to throw, you will have to specify this explicitly; you have three options:

  • Explicitly specify your destructor as noexcept(false),
  • Inherit your class from another one that already specifies its destructor as noexcept(false).
  • Put a non-static data member in your class that already specifies its destructor as noexcept(false).

Finally, if you do decide to throw in the destructor, you should always be aware of the risk of a double-exception (throwing while the stack is being unwind because of an exception). This would cause a call to std::terminate and it is rarely what you want. To avoid this behaviour, you can simply check if there is already an exception before throwing a new one using std::uncaught_exception().

How To Run PHP From Windows Command Line in WAMPServer

In windows, put your php.exe file in windows/system32 or any other system executable folders and then go to command line and type php and hit enter following it, if it doesnt generate any error then you are ready to use PHP on command line. If you have set your php.exe somewhere else than default system folders then you need to set the path of it in the environment variables! You can get there in following path....

control panel -> System -> Edith the environment variables of your account -> Environment Vaiables -> path -> edit then set the absolute path of your php.exe there and follow the same procedure as in first paragraph, if nothing in the error department, then you are ready to use php from command line!

JavaScript: Class.method vs. Class.prototype.method

A. Static Method:

      Class.method = function () { /* code */ }
  1. method() here is a function property added to an another function (here Class).
  2. You can directly access the method() by the class / function name. Class.method();
  3. No need for creating any object/instance (new Class()) for accessing the method(). So you could call it as a static method.

B. Prototype Method (Shared across all the instances):

     Class.prototype.method = function () { /* code using this.values */ }
  1. method() here is a function property added to an another function protype (here Class.prototype).
  2. You can either directly access by class name or by an object/instance (new Class()).
  3. Added advantage - this way of method() definition will create only one copy of method() in the memory and will be shared across all the object's/instance's created from the Class

C. Class Method (Each instance has its own copy):

   function Class () {
      this.method = function () { /* do something with the private members */};
   }
  1. method() here is a method defined inside an another function (here Class).
  2. You can't directly access the method() by the class / function name. Class.method();
  3. You need to create an object/instance (new Class()) for the method() access.
  4. This way of method() definition will create a unique copy of the method() for each and every objects created using the constructor function (new Class()).
  5. Added advantage - Bcos of the method() scope it has the full right to access the local members(also called private members) declared inside the constructor function (here Class)

Example:

    function Class() {
        var str = "Constructor method"; // private variable
        this.method = function () { console.log(str); };
    }
    Class.prototype.method = function() { console.log("Prototype method"); };
    Class.method = function() { console.log("Static method"); };

    new Class().method();     // Constructor method
    // Bcos Constructor method() has more priority over the Prototype method()

    // Bcos of the existence of the Constructor method(), the Prototype method 
    // will not be looked up. But you call it by explicity, if you want.
    // Using instance
    new Class().constructor.prototype.method(); // Prototype method

    // Using class name
    Class.prototype.method(); // Prototype method

    // Access the static method by class name
    Class.method();           // Static method

sprintf like functionality in Python

Something like...

greetings = 'Hello {name}'.format(name = 'John')

Hello John

Get content of a cell given the row and column numbers

It took me a while, but here's how I made it dynamic. It doesn't depend on a sorted table.

First I started with a column of state names (Column A) and a column of aircraft in each state (Column B). (Row 1 is a header row).

Finding the cell that contains the number of aircraft was:

=MATCH(MAX($B$2:$B$54),$B$2:$B$54,0)+MIN(ROW($B$2:$B$54))-1

I put that into a cell and then gave that cell a name, "StateRow" Then using the tips from above, I wound up with this:

=INDIRECT(ADDRESS(StateRow,1))

This returns the name of the state from the dynamic value in row "StateRow", column 1

Now, as the values in the count column change over time as more data is entered, I always know which state has the most aircraft.

Detecting endianness programmatically in a C++ program

while there is no quick and standard way to determine it, this will output it:

#include <stdio.h> 
int main()  
{ 
   unsigned int i = 1; 
   char *c = (char*)&i; 
   if (*c)     
       printf("Little endian"); 
   else
       printf("Big endian"); 
   getchar(); 
   return 0; 
}

Display image at 50% of its "native" size

The zoom property sounds as though it's perfect for Adam Ernst as it suits his target device. However, for those who need a solution to this and have to support as many devices as possible you can do the following:

<img src="..." onload="this.width/=2;this.onload=null;" />

The reason for the this.onload=null addition is to avoid older browsers that sometimes trigger the load event twice (which means you can end up with quater-sized images). If you aren't worried about that though you could write:

<img src="..." onload="this.width/=2;" />

Which is quite succinct.

exit application when click button - iOS

exit(X), where X is a number (according to the doc) should work. But it is not recommended by Apple and won't be accepted by the AppStore. Why? Because of these guidelines (one of my app got rejected):

We found that your app includes a UI control for quitting the app. This is not in compliance with the iOS Human Interface Guidelines, as required by the App Store Review Guidelines.

Please refer to the attached screenshot/s for reference.

The iOS Human Interface Guidelines specify,

"Always Be Prepared to Stop iOS applications stop when people press the Home button to open a different application or use a device feature, such as the phone. In particular, people don’t tap an application close button or select Quit from a menu. To provide a good stopping experience, an iOS application should:

Save user data as soon as possible and as often as reasonable because an exit or terminate notification can arrive at any time.

Save the current state when stopping, at the finest level of detail possible so that people don’t lose their context when they start the application again. For example, if your app displays scrolling data, save the current scroll position."

> It would be appropriate to remove any mechanisms for quitting your app.

Plus, if you try to hide that function, it would be understood by the user as a crash.

What's the main difference between int.Parse() and Convert.ToInt32

Have a look in reflector:

int.Parse("32"):

public static int Parse(string s)
{
    return System.Number.ParseInt32(s, NumberStyles.Integer, NumberFormatInfo.CurrentInfo);
}

which is a call to:

internal static unsafe int ParseInt32(string s, NumberStyles style, NumberFormatInfo info)
{
    byte* stackBuffer = stackalloc byte[1 * 0x72];
    NumberBuffer number = new NumberBuffer(stackBuffer);
    int num = 0;
    StringToNumber(s, style, ref number, info, false);
    if ((style & NumberStyles.AllowHexSpecifier) != NumberStyles.None)
    {
        if (!HexNumberToInt32(ref number, ref num))
        {
            throw new OverflowException(Environment.GetResourceString("Overflow_Int32"));
        }
        return num;
    }
    if (!NumberToInt32(ref number, ref num))
    {
        throw new OverflowException(Environment.GetResourceString("Overflow_Int32"));
    }
    return num;
}

Convert.ToInt32("32"):

public static int ToInt32(string value)
{
    if (value == null)
    {
        return 0;
    }
    return int.Parse(value, CultureInfo.CurrentCulture);
}

As the first (Dave M's) comment says.

Get value from hashmap based on key to JSTL

if all you're trying to do is get the value of a single entry in a map, there's no need to loop over any collection at all. simplifying gautum's response slightly, you can get the value of a named map entry as follows:

<c:out value="${map['key']}"/>

where 'map' is the collection and 'key' is the string key for which you're trying to extract the value.

How to revert a "git rm -r ."?

I had exactly the same issue: was cleaning up my folders, rearranging and moving files. I entered: git rm . and hit enter; and then felt my bowels loosen a bit. Luckily, I didn't type in git commit -m "" straightaway.

However, the following command

git checkout .

restored everything, and saved my life.

Duplicate Entire MySQL Database

To remote server

mysqldump mydbname | ssh host2 "mysql mydbcopy"

To local server

mysqldump mydbname | mysql mydbcopy

Execution sequence of Group By, Having and Where clause in SQL Server?

In below Order

  1. FROM & JOIN
  2. WHERE
  3. GROUP BY
  4. HAVING
  5. SELECT
  6. ORDER BY
  7. LIMIT

heroku - how to see all the logs

for WAR files:

I did not use github, instead I uploaded directly, a WAR file ( which I found to be much easier and faster ).

So the following helped me:

heroku logs --app appname

Hope it will help someone.

Find which version of package is installed with pip

The easiest way is this:

import jinja2
print jinja2.__version__

How to make --no-ri --no-rdoc the default for gem install?

On Windows XP the path to the .gemrc file is 

c:\Documents and Settings\All Users\Application Data\gemrc

and this file is not created by default, you should create it yourself.

How do I resolve a TesseractNotFoundError?

For Mac:

  1. Install Pytesseract (pip install pytesseract should work)
  2. Install Tesseract but only with homebrew, pip installation somehow doesn't work. (brew install tesseract)
  3. Get the path of brew installation of Tesseract on your device (brew list tesseract)
  4. Add the path into your code, not in sys path. The path is to be added along with code, using pytesseract.pytesseract.tesseract_cmd = '<path received in step 3>' - (e.g. pytesseract.pytesseract.tesseract_cmd = '/usr/local/Cellar/tesseract/4.0.0_1/bin/tesseract')

This should work fine.

Initializing a two dimensional std::vector

 
vector<vector<int>> board;
for(int i=0;i<m;i++) {
    board.push_back({});
    for(int j=0;j<n;j++) {
        board[i].push_back(0);
    }
}

This code snippet first inserts an empty vector at each turn, in the other nested loop it pushes the elements inside the vector created by the outer loop. Hope this solves the problem.

How do I use installed packages in PyCharm?

As quick n dirty fix, this worked for me: Adding this 2 lines before the problematic import:

import sys
sys.path.append('C:\\Python27\\Lib\site-packages')

Django Cookies, how can I set them?

UPDATE : check Peter's answer below for a builtin solution :

This is a helper to set a persistent cookie:

import datetime

def set_cookie(response, key, value, days_expire=7):
    if days_expire is None:
        max_age = 365 * 24 * 60 * 60  # one year
    else:
        max_age = days_expire * 24 * 60 * 60
    expires = datetime.datetime.strftime(
        datetime.datetime.utcnow() + datetime.timedelta(seconds=max_age),
        "%a, %d-%b-%Y %H:%M:%S GMT",
    )
    response.set_cookie(
        key,
        value,
        max_age=max_age,
        expires=expires,
        domain=settings.SESSION_COOKIE_DOMAIN,
        secure=settings.SESSION_COOKIE_SECURE or None,
    )

Use the following code before sending a response.

def view(request):
    response = HttpResponse("hello")
    set_cookie(response, 'name', 'jujule')
    return response

UPDATE : check Peter's answer below for a builtin solution :

HTML form action and onsubmit issues

Try

onsubmit="return checkRegistration()"

How can I compile and run c# program without using visual studio?

If you have a project ready and just want to change some code and then build. Check out MSBuild which is located in the Microsoft.Net under windows directory.

C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild "C:\Projects\MyProject.csproj" /p:Configuration=Debug;DeployOnBuild=True;PackageAsSingleFile=False;outdir=C:\Projects\MyProjects\Publish\

(Please do not edit, leave as a single line)

... The line above broken up for readability

C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild "C:\Projects\MyProject.csproj"
/p:Configuration=Debug;DeployOnBuild=True;PackageAsSingleFile=False;
outdir=C:\Projects\MyProjects\Publish\

Team Build Error: The Path ... is already mapped to workspace

the rest was fairly easy.

Simply go to this folder: C:\Users{UserName}\AppData\Local\Microsoft\Team Foundation\4\Cache and delete all that's in the folder.

Why doesn't os.path.join() work in this case?

The latter strings shouldn't start with a slash. If they start with a slash, then they're considered an "absolute path" and everything before them is discarded.

Quoting the Python docs for os.path.join:

If a component is an absolute path, all previous components are thrown away and joining continues from the absolute path component.

Note on Windows, the behaviour in relation to drive letters, which seems to have changed compared to earlier Python versions:

On Windows, the drive letter is not reset when an absolute path component (e.g., r'\foo') is encountered. If a component contains a drive letter, all previous components are thrown away and the drive letter is reset. Note that since there is a current directory for each drive, os.path.join("c:", "foo") represents a path relative to the current directory on drive C: (c:foo), not c:\foo.

Android Studio emulator does not come with Play Store for API 23

Solved in easy way: You should create a new emulator, before opening it for the first time follow these 3 easy steps:

1- go to "C:\Users[user].android\avd[your virtual device folder]" open "config.ini" with text editor like notepad

2- change

"PlayStore.enabled=false" to "PlayStore.enabled=true"

3- change

"mage.sysdir.1 = system-images\android-30\google_apis\x86"

to

"image.sysdir.1 = system-images\android-30\google_apis_playstore\x86"

Android Studio Stuck at Gradle Download on create new project

For Windows Users

Use your Network Resource Monitor

enter image description here

Open Task Manager [Ctrl+Shift+Esc]

Performance Tab

Open Resource Monitor (From the bottom)

First i decided to wait after reading answers here. But how long..? How to make sure it will finish.? They should have provided percentage of download, but they have not. So to know some kind of progress is going on, open this network resource monitor, it will show you some kind of download is going on for the Studio64.exe. IF not (if it shows 0B/Sec), then either network is not available or the application is not responding.

Ignore Duplicates and Create New List of Unique Values in Excel

On a sorted column, you can also try this idea:

B2=A2
B3=IFERROR(INDEX(A:A,MATCH(B2,A:A,1)+1),"")

B3 can be pasted down. It will result 0, after the last unique match. If this is unwanted, put some IF statement around to exclude this.

Edit:

Easier than an IF statement, at least for text-values:

B3=IFERROR(T(INDEX(A:A,MATCH(B2,A:A,1)+1)),"")

ORDER BY the IN value list

 
create sequence serial start 1;

select * from comments c
join (select unnest(ARRAY[1,3,2,4]) as id, nextval('serial') as id_sorter) x
on x.id = c.id
order by x.id_sorter;

drop sequence serial;

[EDIT]

unnest is not yet built-in in 8.3, but you can create one yourself(the beauty of any*):

create function unnest(anyarray) returns setof anyelement
language sql as
$$
    select $1[i] from generate_series(array_lower($1,1),array_upper($1,1)) i;
$$;

that function can work in any type:

select unnest(array['John','Paul','George','Ringo']) as beatle
select unnest(array[1,3,2,4]) as id

How do I put an already-running process under nohup?

On my AIX system, I tried 

nohup -p  processid>

This worked well. It continued to run my process even after closing terminal windows. We have ksh as default shell so the bg and disown commands didn't work.

Access denied for user 'root'@'localhost' with PHPMyAdmin

Edit your phpmyadmin config.inc.php file and if you have Password, insert that in front of Password in following code:

$cfg['Servers'][$i]['verbose'] = 'localhost';
$cfg['Servers'][$i]['host'] = 'localhost';
$cfg['Servers'][$i]['port'] = '3306';
$cfg['Servers'][$i]['socket'] = '';
$cfg['Servers'][$i]['connect_type'] = 'tcp';
$cfg['Servers'][$i]['extension'] = 'mysqli';
$cfg['Servers'][$i]['auth_type'] = 'config';
$cfg['Servers'][$i]['user'] = '**your-root-username**';
$cfg['Servers'][$i]['password'] = '**root-password**';
$cfg['Servers'][$i]['AllowNoPassword'] = true;

Delete a row from a table by id

How about:

function deleteRow(rowid)  
{   
    var row = document.getElementById(rowid);
    row.parentNode.removeChild(row);
}

And, if that fails, this should really work:

function deleteRow(rowid)  
{   
    var row = document.getElementById(rowid);
    var table = row.parentNode;
    while ( table && table.tagName != 'TABLE' )
        table = table.parentNode;
    if ( !table )
        return;
    table.deleteRow(row.rowIndex);
}

Using BeautifulSoup to extract text without tags

I think you can get it using subc1.text.

>>> html = """
<p>
    <strong class="offender">YOB:</strong> 1987<br />
    <strong class="offender">RACE:</strong> WHITE<br />
    <strong class="offender">GENDER:</strong> FEMALE<br />
    <strong class="offender">HEIGHT:</strong> 5'05''<br />
    <strong class="offender">WEIGHT:</strong> 118<br />
    <strong class="offender">EYE COLOR:</strong> GREEN<br />
    <strong class="offender">HAIR COLOR:</strong> BROWN<br />
</p>
"""
>>> from bs4 import BeautifulSoup
>>> soup = BeautifulSoup(html)
>>> print soup.text


YOB: 1987
RACE: WHITE
GENDER: FEMALE
HEIGHT: 5'05''
WEIGHT: 118
EYE COLOR: GREEN
HAIR COLOR: BROWN

Or if you want to explore it, you can use .contents :

>>> p = soup.find('p')
>>> from pprint import pprint
>>> pprint(p.contents)
[u'\n',
 <strong class="offender">YOB:</strong>,
 u' 1987',
 <br/>,
 u'\n',
 <strong class="offender">RACE:</strong>,
 u' WHITE',
 <br/>,
 u'\n',
 <strong class="offender">GENDER:</strong>,
 u' FEMALE',
 <br/>,
 u'\n',
 <strong class="offender">HEIGHT:</strong>,
 u" 5'05''",
 <br/>,
 u'\n',
 <strong class="offender">WEIGHT:</strong>,
 u' 118',
 <br/>,
 u'\n',
 <strong class="offender">EYE COLOR:</strong>,
 u' GREEN',
 <br/>,
 u'\n',
 <strong class="offender">HAIR COLOR:</strong>,
 u' BROWN',
 <br/>,
 u'\n']

and filter out the necessary items from the list:

>>> data = dict(zip([x.text for x in p.contents[1::4]], [x.strip() for x in p.contents[2::4]]))
>>> pprint(data)
{u'EYE COLOR:': u'GREEN',
 u'GENDER:': u'FEMALE',
 u'HAIR COLOR:': u'BROWN',
 u'HEIGHT:': u"5'05''",
 u'RACE:': u'WHITE',
 u'WEIGHT:': u'118',
 u'YOB:': u'1987'}

EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) on dispatch_semaphore_dispose

I had a different issue that brought me to this question, which will probably be more common than the overrelease issue in the accepted answer.

Root cause was our completion block being called twice due to bad if/else fallthrough in the network handler, leading to two calls of dispatch_group_leave for every one call to dispatch_group_enter.

Completion block called multiple times:

dispatch_group_enter(group);
[self badMethodThatCallsMULTIPLECompletions:^(NSString *completion) {

    // this block is called multiple times
    // one `enter` but multiple `leave`

    dispatch_group_leave(group);
}];

Debug via the dispatch_group's count

Upon the EXC_BAD_INSTRUCTION, you should still have access to your dispatch_group in the debugger. DispatchGroup: check how many "entered"

Print out the dispatch_group and you'll see:

<OS_dispatch_group: group[0x60800008bf40] = { xrefcnt = 0x2, refcnt = 0x1, port = 0x0, count = -1, waiters = 0 }>

When you see count = -1 it indicates that you've over-left the dispatch_group. Be sure to dispatch_enter and dispatch_leave the group in matched pairs.

Chosen Jquery Plugin - getting selected values

This solution worked for me

var ar = [];
$('#id option:selected').each(function(index,valor){
    ar.push(valor.value);
});
console.log(ar);

be sure to have your <option> tags with they correspondant value attribute. Hope it helps.

jQuery: How to detect window width on the fly?

I dont know if this useful for you when you resize your page:

$(window).resize(function() {
       if(screen.width == window.innerWidth){
           alert("you are on normal page with 100% zoom");
       } else if(screen.width > window.innerWidth){
           alert("you have zoomed in the page i.e more than 100%");
       } else {
           alert("you have zoomed out i.e less than 100%");
       }
    });

Get String in YYYYMMDD format from JS date object?

If you don't need a pure JS solution, you can use jQuery UI to do the job like this :

$.datepicker.formatDate('yymmdd', new Date());

I usually don't like to import too much libraries. But jQuery UI is so useful, you will probably use it somewhere else in your project.

Visit http://api.jqueryui.com/datepicker/ for more examples

Java, How to add library files in netbeans?

How to import a commons-library into netbeans.

  1. Evaluate the error message in NetBeans:

    java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory

  2. NoClassDeffFoundError means somewhere under the hood in the code you used, a method called another method which invoked a class that cannot be found. So what that means is your code did this: MyFoobarClass foobar = new MyFoobarClass() and the compiler is confused because nowhere is defined this MyFoobarClass. This is why you get an error.

  3. To know what to do next, you have to look at the error message closely. The words 'org/apache/commons' lets you know that this is the codebase that provides the tools you need. You have a choice, either you can import EVERYTHING in apache commons, or you could import JUST the LogFactory class, or you could do something in between. Like for example just get the logging bit of apache commons.

  4. You'll want to go the middle of the road and get commons-logging. Excellent choice, fire up the google and search for apache commons-logging. The first link takes you to http://commons.apache.org/proper/commons-logging/. Go to downloads. There you will find the most up-to-date ones. If your project was compiled under ancient versions of commons-logging, then use those same ancient ones because if you use the newer ones, the code may fail because the newer versions are different.

  5. You're going to want to download the commons-logging-1.1.3-bin.zip or something to that effect. Read what the name is saying. The .zip means it's a compressed file. commons-logging means that this one should contain the LogFactory class you desire. the middle 1.1.3 means that is the version. if you are compiling for an old version, you'll need to match these up, or else you risk the code not compiling right due to changes due to upgrading.

  6. Download that zip. Unzip it. Search around for things that end in .jar. In netbeans right click your project, click properties, click libraries, click "add jar/folder" and import those jars. Save the project, and re-run, and the errors should be gone.

The binaries don't include the source code, so you won't be able to drill down and see what is happening when you debug. As programmers you should be downloading "the source" of apache commons and compiling from source, generating the jars yourself and importing those for experience. You should be smart enough to understand and correct the source code you are importing. These ancient versions of apache commons might have been compiled under an older version of Java, so if you go too far back, they may not even compile unless you compile them under an ancient version of java.

Why Git is not allowing me to commit even after configuration?

You're setting the global git options, but the local checkout possibly has overrides set. Try setting them again with git config --local <setting> <value>. You can look at the .git/config file in your local checkout to see what local settings the checkout has defined.

How do I read image data from a URL in Python?

Python 3

from urllib.request import urlopen
from PIL import Image

img = Image.open(urlopen(url))
img

Jupyter Notebook and IPython

import IPython
url = 'https://newevolutiondesigns.com/images/freebies/colorful-background-14.jpg'
IPython.display.Image(url, width = 250)

Unlike other methods, this method also works in a for loop!

Including a css file in a blade template?

 
<link rel="stylesheet" href="{{ URL::asset('css/styles.css') }}">

It will search for the file in your project public folder

Loop in react-native

You can create render the results (payments) and use a fancy way to iterate over items instead of adding a for loop.

_x000D_
_x000D_ 
const noGuest = 3;_x000D_
_x000D_
Array(noGuest).fill(noGuest).map(guest => {_x000D_
  console.log(guest);_x000D_
});
_x000D_
_x000D_
_x000D_

Example: 

renderPayments(noGuest) {
  return Array(noGuest).fill(noGuest).map((guess, index) => {
    return(
      <View key={index}>
        <View><TextInput /></View>
        <View><TextInput /></View>
        <View><TextInput /></View>
      </View>
    );
  }
}

Then use it where you want it

render() {
  return(
     const { guest } = this.state;
     ...
     {this.renderPayments(guest)}
  );
}

Hope you got the idea.

If you want to understand this in simple Javascript check Array.prototype.fill()

How to change default timezone for Active Record in Rails?

On rails 4.2.2, go to application.rb and use config.time_zone='city' (e.g.:'London' or 'Bucharest' or 'Amsterdam' and so on).

It should work just fine. It worked for me.

How to kill a while loop with a keystroke?

pyHook might help. http://sourceforge.net/apps/mediawiki/pyhook/index.php?title=PyHook_Tutorial#tocpyHook%5FTutorial4

See keyboard hooks; this is more generalized-- if you want specific keyboard interactions and not just using KeyboardInterrupt.

Also, in general (depending on your use) I think having the Ctrl-C option still available to kill your script makes sense.

See also previous question: Detect in python which keys are pressed

What is the coolest thing you can do in <10 lines of simple code? Help me inspire beginners!

PHP - the Sierpinski gasket a.k.a the Triforce

OK, it's 15 lines of code but the result is awesome! That's the kind of stuff that made me freak out when I was a child. This is from the PHP manual:

$x = 200;
$y = 200;

$gd = imagecreatetruecolor($x, $y);
 
$corners[0] = array('x' => 100, 'y' =>  10);
$corners[1] = array('x' =>   0, 'y' => 190);
$corners[2] = array('x' => 200, 'y' => 190);

$red = imagecolorallocate($gd, 255, 0, 0); 

for ($i = 0; $i < 100000; $i++) {
  imagesetpixel($gd, round($x),round($y), $red);
  $a = rand(0, 2);
  $x = ($x + $corners[$a]['x']) / 2;
  $y = ($y + $corners[$a]['y']) / 2;
}
 
header('Content-Type: image/png');
imagepng($gd);

sierpinski gasket

How to create nonexistent subdirectories recursively using Bash?

 
$ mkdir -p "$BACKUP_DIR/$client/$year/$month/$day"

How to add a new line in textarea element?

I've found String.fromCharCode(13, 10) helpful when using view engines. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCharCode

This creates a string with the actual newline characters in it and so forces the view engine to output a newline rather than an escaped version. Eg: Using NodeJS EJS view engine - This is a simple example in which any \n should be replaced:

viewHelper.js

exports.replaceNewline = function(input) {
    var newline = String.fromCharCode(13, 10);
    return input.replaceAll('\\n', newline);
}

EJS

<textarea><%- viewHelper.replaceNewline("Blah\nblah\nblah") %></textarea>

Renders

<textarea>Blah
blah
blah</textarea>

replaceAll:

String.prototype.replaceAll = function (find, replace) {
    var result = this;
    do {
        var split = result.split(find);
        result = split.join(replace);
    } while (split.length > 1);
    return result;
};

Delete files or folder recursively on Windows CMD

After the blog post How Can I Use Windows PowerShell to Delete All the .TMP Files on a Drive?, you can use something like this to delete all .tmp for example from a folder and all subfolders in PowerShell:

get-childitem [your path/ or leave empty for current path] -include
*.tmp -recurse | foreach ($_) {remove-item $_.fullname}

How to Set RadioButtonFor() in ASp.net MVC 2 as Checked by default

This question on StackOverflow deals with RadioButtonListFor and the answer addresses your question too. You can set the selected property in the RadioButtonListViewModel.

Using Python String Formatting with Lists

Since I just learned about this cool thing(indexing into lists from within a format string) I'm adding to this old question. 

s = '{x[0]} BLAH {x[1]} FOO {x[2]} BAR'
x = ['1', '2', '3']
print (s.format (x=x))

Output:

1 BLAH 2 FOO 3 BAR

However, I still haven't figured out how to do slicing(inside of the format string '"{x[2:4]}".format...,) and would love to figure it out if anyone has an idea, however I suspect that you simply cannot do that.

how to get date of yesterday using php?

there you go

date('d.m.Y',strtotime("-1 days"));

this will work also if month change

file_get_contents behind a proxy?

There's a similar post here: http://techpad.co.uk/content.php?sid=137 which explains how to do it. 

function file_get_contents_proxy($url,$proxy){

    // Create context stream
    $context_array = array('http'=>array('proxy'=>$proxy,'request_fulluri'=>true));
    $context = stream_context_create($context_array);

    // Use context stream with file_get_contents
    $data = file_get_contents($url,false,$context);

    // Return data via proxy
    return $data;

}

In MySQL, how to copy the content of one table to another table within the same database?

This worked for me,

CREATE TABLE newtable LIKE oldtable;

Replicates newtable with old table

INSERT newtable SELECT * FROM oldtable;

Copies all the row data to new table.

Thank you

Java : Cannot format given Object as a Date

DateFormat.format only works on Date values.

You should use two SimpleDateFormat objects: one for parsing, and one for formatting. For example:

// Note, MM is months, not mm
DateFormat outputFormat = new SimpleDateFormat("MM/yyyy", Locale.US);
DateFormat inputFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSX", Locale.US);

String inputText = "2012-11-17T00:00:00.000-05:00";
Date date = inputFormat.parse(inputText);
String outputText = outputFormat.format(date);

EDIT: Note that you may well want to specify the time zone and/or locale in your formats, and you should also consider using Joda Time instead of all of this to start with - it's a much better date/time API.

TypeError: ufunc 'add' did not contain a loop with signature matching types

You have a numpy array of strings, not floats. This is what is meant by dtype('<U9') -- a little endian encoded unicode string with up to 9 characters.

try:

return sum(np.asarray(listOfEmb, dtype=float)) / float(len(listOfEmb))

However, you don't need numpy here at all. You can really just do:

return sum(float(embedding) for embedding in listOfEmb) / len(listOfEmb)

Or if you're really set on using numpy.

return np.asarray(listOfEmb, dtype=float).mean()

Executable directory where application is running from?

You can write the following:

Path.Combine(Path.GetParentDirectory(GetType(MyClass).Assembly.Location), "Images\image.jpg")

YouTube embedded video: set different thumbnail

The answers did not work for me. Maybe they were outdated.

Anyway, found this website, which does all the job for you, and even prevent you from needing to read the unclear-as-usual google documentation: http://www.classynemesis.com/projects/ytembed/

Vim for Windows - What do I type to save and exit from a file?

  • Press i or a to get into insert mode, and type the message of choice

  • Press ESC several times to get out of insert mode, or any other mode you might have run into by accident

    • to save, :wq, :x or ZZ

    • to exit without saving, :q! or ZQ

To reload a file and undo all changes you have made...:

Press several times ESC and then enter :e!.

XPath with multiple conditions

Use:

/category[@name='Sport' and author/text()[1]='James Small']

or use:

/category[@name='Sport' and author[starts-with(.,'James Small')]]

It is a good rule to try to avoid using the // pseudo-operator whenever possible, because its evaluation can typically be very slow.

Also:

./somename

is equivalent to:

somename

so it is recommended to use the latter.

Android 6.0 Marshmallow. Cannot write to SD Card

I faced the same problem. There are two types of permissions in Android:

  • Dangerous (access to contacts, write to external storage...)
  • Normal

Normal permissions are automatically approved by Android while dangerous permissions need to be approved by Android users.

Here is the strategy to get dangerous permissions in Android 6.0

  1. Check if you have the permission granted
  2. If your app is already granted the permission, go ahead and perform normally.
  3. If your app doesn't have the permission yet, ask for user to approve
  4. Listen to user approval in onRequestPermissionsResult

Here is my case: I need to write to external storage.

First, I check if I have the permission:

...
private static final int REQUEST_WRITE_STORAGE = 112;
...
boolean hasPermission = (ContextCompat.checkSelfPermission(activity,
            Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED);
if (!hasPermission) {
    ActivityCompat.requestPermissions(parentActivity,
                new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                REQUEST_WRITE_STORAGE);
}

Then check the user's approval:

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode)
    {
        case REQUEST_WRITE_STORAGE: {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
            {
                //reload my activity with permission granted or use the features what required the permission
            } else
            {
                Toast.makeText(parentActivity, "The app was not allowed to write to your storage. Hence, it cannot function properly. Please consider granting it this permission", Toast.LENGTH_LONG).show();
            }
        }
    }

}

You can read more about the new permission model here: https://developer.android.com/training/permissions/requesting.html

Object of class mysqli_result could not be converted to string in

The mysqli_query() method returns an object resource to your $result variable, not a string.

You need to loop it up and then access the records. You just can't directly use it as your $result variable.

while ($row = $result->fetch_assoc()) {
    echo $row['classtype']."<br>";
}

Convert string to JSON array

Try this piece of code:

try {        
    Log.e("log_tag", "Error in convert String" + result.toString());
    JSONObject json_data = new JSONObject(result);

    String status = json_data.getString("Status");
    {
        String data = json_data.getString("locations");
        JSONArray json_data1 = new JSONArray(data);
        for (int i = 0; i < json_data1.length(); i++) {
            json_data = json_data1.getJSONObject(i);

            String lat = json_data.getString("lat");
            String lng = json_data.getString("long");
        }
    }
}

How to code a modulo (%) operator in C/C++/Obj-C that handles negative numbers

Example template for C++

template< class T >
T mod( T a, T b )
{
    T const r = a%b;
    return ((r!=0)&&((r^b)<0) ? r + b : r);
}

With this template, the returned remainder will be zero or have the same sign as the divisor (denominator) (the equivalent of rounding towards negative infinity), instead of the C++ behavior of the remainder being zero or having the same sign as the dividend (numerator) (the equivalent of rounding towards zero).

Upgrading PHP on CentOS 6.5 (Final)

As Jacob mentioned, the CentOS packages repo appears to only have PHP 5.3 available at the moment. But these commands seemed to work for me...

rpm -Uvh http://mirror.webtatic.com/yum/el6/latest.rpm
yum remove php-common       # Need to remove this, otherwise it conflicts
yum install php56w
yum install php56w-mysql
yum install php56w-common
yum install php56w-pdo
yum install php56w-opcache
php --version               # Verify version has been upgraded

You can alternatively use php54w or php55w if required.

CAUTION!
This may potentially break your website if it doesn't fully resolve all your dependencies, so you may need a couple of extra packages in some cases. See here for a list of other PHP 5.6 modules that are available.

If you encounter a problem and need to reset back to the default, you can use these commands:

sudo yum remove php56w
sudo yum remove php56w-common
sudo yum install php-common
sudo yum install php-mysql
sudo yum install php

(Thanks Fabrizio Bartolomucci)

Call to a member function on a non-object

Either $objPage is not an instance variable OR your are overwriting $objPage with something that is not an instance of class PageAttributes.

Please run `npm cache clean`

As of npm@5, the npm cache self-heals from corruption issues and data extracted from the cache is guaranteed to be valid. If you want to make sure everything is consistent, use npm cache verify instead. On the other hand, if you're debugging an issue with the installer, you can use npm install --cache /tmp/empty-cache to use a temporary cache instead of nuking the actual one.

If you're sure you want to delete the entire cache, rerun:

npm cache clean --force

A complete log of this run can be found in /Users/USERNAME/.npm/_logs/2019-01-08T21_29_30_811Z-debug.log.

How to delete columns in a CSV file?

Off the top of my head, this will do it without any sort of error checking nor ability to configure anything. That is "left to the reader".

outFile = open( 'newFile', 'w' )
for line in open( 'oldFile' ):
   items = line.split( ',' )
   outFile.write( ','.join( items[:2] + items[ 3: ] ) )
outFile.close()

Quicksort: Choosing the pivot

I recommend using the middle index, as it can be calculated easily.

You can calculate it by rounding (array.length / 2).

Vue equivalent of setTimeout?

please use setInterval like below:

    setInterval(()=>{this.checkOrder()},2000);

Do you need to dispose of objects and set them to null?

If the object implements IDisposable, then yes, you should dispose it. The object could be hanging on to native resources (file handles, OS objects) that might not be freed immediately otherwise. This can lead to resource starvation, file-locking issues, and other subtle bugs that could otherwise be avoided.

See also Implementing a Dispose Method on MSDN.

Read/Write 'Extended' file properties (C#)
  • After looking at a number of solutions on this thread and elsewhere the following code was put together. This is only to read a property.
  • I could not get the Shell32.FolderItem2.ExtendedProperty function to work, it is supposed to take a string value and return the correct value and type for that property... this was always null for me and developer reference resources were very thin.
  • The WindowsApiCodePack seems to have been abandoned by Microsoft which brings us the code below.

Use:

string propertyValue = GetExtendedFileProperty("c:\\temp\\FileNameYouWant.ext","PropertyYouWant");
  1. Will return you the value of the extended property you want as a string for the given file and property name.
  2. Only loops until it found the specified property - not until all properties are discovered like some sample code

  3. Will work on Windows versions like Windows server 2008 where you will get the error "Unable to cast COM object of type 'System.__ComObject' to interface type 'Shell32.Shell'" if just trying to create the Shell32 Object normally.

    public static string GetExtendedFileProperty(string filePath, string propertyName)
{
    string value = string.Empty;
    string baseFolder = Path.GetDirectoryName(filePath);
    string fileName = Path.GetFileName(filePath);

    //Method to load and execute the Shell object for Windows server 8 environment otherwise you get "Unable to cast COM object of type 'System.__ComObject' to interface type 'Shell32.Shell'"
    Type shellAppType = Type.GetTypeFromProgID("Shell.Application");
    Object shell = Activator.CreateInstance(shellAppType);
    Shell32.Folder shellFolder = (Shell32.Folder)shellAppType.InvokeMember("NameSpace", System.Reflection.BindingFlags.InvokeMethod, null, shell, new object[] { baseFolder });

    //Parsename will find the specific file I'm looking for in the Shell32.Folder object
    Shell32.FolderItem folderitem = shellFolder.ParseName(fileName);
    if (folderitem != null)
    {
        for (int i = 0; i < short.MaxValue; i++)
        {
            //Get the property name for property index i
            string property = shellFolder.GetDetailsOf(null, i);

            //Will be empty when all possible properties has been looped through, break out of loop
            if (String.IsNullOrEmpty(property)) break;

            //Skip to next property if this is not the specified property
            if (property != propertyName) continue;    

            //Read value of property
            value = shellFolder.GetDetailsOf(folderitem, i);
        }
    }
    //returns string.Empty if no value was found for the specified property
    return value;
}

Command Line Tools not working - OS X El Capitan, Sierra, High Sierra, Mojave

Updated to High Sierra 10.13.2

xcode-select --install ALONE did not work for me.

  1. Download X-code from app store

  2. $xcode-select --install
    a. May need to update after install using softwareupdate in command line. $sudo softwareupdate -i "Command Line Tools (macOS High Sierra version 10.13) for Xcode-9.1"

  3. $sudo xcodebuild -license

javascript Unable to get property 'value' of undefined or null reference

The issue is how you're attempting to get the value. Things like... 

if ( document.frm_new_user_request.u_isid.value == '' )

won't work. You need to find the element you want to get the value of first. It's not quite like a server side language where you can type in an object's reference name and a period to get or assign values. 

document.getElementById('[id goes here]').value;

will work. Note: JavaScript is case-sensitive

I would recommend using: 

var variablename = document.getElementById('[id goes here]');

or 

var variablename = document.getElementById('[id goes here]').value;

How to remove unwanted space between rows and columns in table?

For images in td, use this for images:

display: block;

That removes unwanted space for me

IsNull function in DB2 SQL?

 
Select Product.ID, VALUE(product.Name, "Internal") AS ProductName from Product

Linux/Unix command to determine if process is running?

Just a minor addition: if you add the -c flag to ps, you don't need to remove the line containing the grep process with grep -v afterwards. I.e.

ps acux | grep cron

is all the typing you'll need on a bsd-ish system (this includes MacOSX) You can leave the -u away if you need less information.

On a system where the genetics of the native ps command point back to SysV, you'd use

ps -e |grep cron

or

ps -el |grep cron

for a listing containing more than just pid and process name. Of course you could select the specific fields to print out using the -o <field,field,...> option.

How do I see the extensions loaded by PHP?

If you want to test if a particular extension is loaded you can also use the extension_loaded function, see documentation here

php -r "var_dump(extension_loaded('json'));"

Groovy String to Date

I think the best easy way in this case is to use parseToStringDate which is part of GDK (Groovy JDK enhancements):

Parse a String matching the pattern EEE MMM dd HH:mm:ss zzz yyyy containing US-locale-constants only (e.g. Sat for Saturdays). Such a string is generated by the toString method of Date

Example:

println(Date.parseToStringDate("Tue Aug 10 16:02:43 PST 2010").format('MM-dd-yyyy'))

How do I convert the date from one format to another date object in another format without using any deprecated classes?

 
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

             String fromDateFormat = "dd/MM/yyyy";
             String fromdate = 15/03/2018; //Take any date

             String CheckFormat = "dd MMM yyyy";//take another format like dd/MMM/yyyy
             String dateStringFrom;

             Date DF = new Date();


              try
              {
                 //DateFormatdf = DateFormat.getDateInstance(DateFormat.SHORT);
                 DateFormat FromDF = new SimpleDateFormat(fromDateFormat);
                 FromDF.setLenient(false);  // this is important!
                 Date FromDate = FromDF.parse(fromdate);
                 dateStringFrom = new 
                 SimpleDateFormat(CheckFormat).format(FromDate);
                 DateFormat FromDF1 = new SimpleDateFormat(CheckFormat);
                 DF=FromDF1.parse(dateStringFrom);
                 System.out.println(dateStringFrom);
              }
              catch(Exception ex)
              {

                  System.out.println("Date error");

              }

output:- 15/03/2018
         15 Mar 2018

Setting up redirect in web.config file

In case that you need to add the http redirect in many sites, you could use it as a c# console program:

   class Program
{
    static int Main(string[] args)
    {
        if (args.Length < 3)
        {
            Console.WriteLine("Please enter an argument: for example insert-redirect ./web.config http://stackoverflow.com");
            return 1;
        }

        if (args.Length == 3)
        {
            if (args[0].ToLower() == "-insert-redirect")
            {
                var path = args[1];
                var value = args[2];

                if (InsertRedirect(path, value))
                    Console.WriteLine("Redirect added.");
                return 0;
            }
        }

        Console.WriteLine("Wrong parameters.");
        return 1;

    }

    static bool InsertRedirect(string path, string value)
    {
        try
        {
            XmlDocument doc = new XmlDocument();

            doc.Load(path);

            // This should find the appSettings node (should be only one):
            XmlNode nodeAppSettings = doc.SelectSingleNode("//system.webServer");

            var existNode = nodeAppSettings.SelectSingleNode("httpRedirect");
            if (existNode != null)
                return false;

            // Create new <add> node
            XmlNode nodeNewKey = doc.CreateElement("httpRedirect");

            XmlAttribute attributeEnable = doc.CreateAttribute("enabled");
            XmlAttribute attributeDestination = doc.CreateAttribute("destination");
            //XmlAttribute attributeResponseStatus = doc.CreateAttribute("httpResponseStatus");

            // Assign values to both - the key and the value attributes:

            attributeEnable.Value = "true";
            attributeDestination.Value = value;
            //attributeResponseStatus.Value = "Permanent";

            // Add both attributes to the newly created node:
            nodeNewKey.Attributes.Append(attributeEnable);
            nodeNewKey.Attributes.Append(attributeDestination);
            //nodeNewKey.Attributes.Append(attributeResponseStatus);

            // Add the node under the 
            nodeAppSettings.AppendChild(nodeNewKey);
            doc.Save(path);

            return true;
        }
        catch (Exception e)
        {
            Console.WriteLine($"Exception adding redirect: {e.Message}");
            return false;
        }
    }
}

Convert xlsx file to csv using batch

You need an external tool, in example: SoftInterface.com - Convert XLSX to CSV.

After installing it, you can use following command in your batch:

"c:\Program Files\Softinterface, Inc\Convert XLS\ConvertXLS.EXE" /S"C:\MyExcelFile.xlsx" /F51 /N"Sheet1" /T"C:\MyExcelFile.CSV" /C6 /M1 /V

Delete ActionLink with confirm dialog

Don't confuse routeValues with htmlAttributes. You probably want this overload:

<%= Html.ActionLink(
    "Delete", 
    "Delete", 
    new { id = item.storyId }, 
    new { onclick = "return confirm('Are you sure you wish to delete this article?');" }) 
%>

How to fix Git error: object file is empty?

Here is a way to solve the problem if your public repo on github.com is working, but your local repo is corrupt. Be aware that you will loose all the commits you've done in the local repo.

Alright, so I have one repo locally that is giving me this object empty error, and the same repo on github.com, but without this error. So what I simply did was to clone the repo that is working from github, and then copied everything from the corrupt repo (except the .git folder), and paste it the cloned repo that is working.

This may not be a practical solution (since you delete the local commits), however, you maintain the code and a repaired version control.

Remember to back-up before applying this approach.

Print JSON parsed object?

If you want to debug why not use console debug

window.console.debug(jsonObject);

Jenkins: Failed to connect to repository

In my case I resolved this issue by

  • clicking button Add which is next to the "Credentials" text
  • adding credentials (login and password)
  • selecting these credentials on the popup menu, which is on the left of the Add button
  • waiting for a couple of seconds

My environment was Jenkins installed in the Windows. The UI question was why the warning was placed before the tool to resolve it.

How do you use "git --bare init" repository?

You could also ask git to create directory for you:

git init --bare test_repo.git

All ASP.NET Web API controllers return 404

Add following line

GlobalConfiguration.Configure(WebApiConfig.Register);

in Application_Start() function in Global.ascx.cs file.

Best way to increase heap size in catalina.bat file

If you look in your installation's bin directory you will see catalina.sh or .bat scripts. If you look in these you will see that they run a setenv.sh or setenv.bat script respectively, if it exists, to set environment variables. The relevant environment variables are described in the comments at the top of catalina.sh/bat. To use them create, for example, a file $CATALINA_HOME/bin/setenv.sh with contents

export JAVA_OPTS="-server -Xmx512m"

For Windows you will need, in setenv.bat, something like

set JAVA_OPTS=-server -Xmx768m

Original answer here

After you run startup.bat, you can easily confirm the correct settings have been applied provided you have turned @echo on somewhere in your catatlina.bat file (a good place could be immediately after echo Using CLASSPATH: "%CLASSPATH%"):

enter image description here

How do I get the day month and year from a Windows cmd.exe script?

For one line!

Try using for wmic OS Get localdatetime^|find "." in for /f without tokens and/or delims, this works in any language / region and also, no user settings interfere with the layout of the output.

  • In command line:
for /f %i in ('wmic OS Get localdatetime^|find "."')do @cmd/v/c "set _date=%i &echo= year: !_date:~0,4!&&echo=month:   !_date:~4,2!&echo=  day:   !_date:~6,2!"
  • In bat/cmd file:
for /f %%i in ('wmic OS Get localdatetime^|find "."')do @cmd/v/c "set _date=%%i &echo= year: !_date:~0,4!&&echo=month:   !_date:~4,2!&echo=  day:   !_date:~6,2!"

Results:

 year: 2019
month:   06
  day:   12
  • With Hour and Minute in bat/cmd file:
for /f %%i in ('wmic OS Get localdatetime^|find "."')do @cmd/v/c "set _date=%%i &echo=  year: !_date:~0,4!&&echo= month:   !_date:~4,2!&echo=   day:   !_date:~6,2!&echo=  hour:   !_date:~8,2!&echo=minute:   !_date:~10,2!"
  • With Hour and Minute in command line:
for /f %i in ('wmic OS Get localdatetime^|find "."')do @cmd/v/c "set _date=%i &echo=  year: !_date:~0,4!&&echo= month:   !_date:~4,2!&echo=   day:   !_date:~6,2!&echo=  hour:   !_date:~8,2!&echo=minute:   !_date:~10,2!"

Results:

  year: 2020
 month:   05
   day:   16
  hour:   00
minute:   46

How to convert string to float?

By using sscanf we can convert string to float.

#include<stdio.h>    
#include<string.h>    

int main() 
{
    char str[100] ="4.0800" ;     
    const char s[2] = "-";   
    char *token;
    double x;
   /* get the first token */ 
   token = strtok(str, s);
   sscanf(token,"%f",&x);
    printf( " %f",x );

    return 0; 
}

Submit form using <a> tag

Using Jquery you can do something like this:

_x000D_
_x000D_ 
$(document).ready(function() {_x000D_
  $('#btnSubmit').click(function() {_x000D_
    $('#deleteFrm').submit();_x000D_
  });_x000D_
_x000D_
});
_x000D_ 
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>_x000D_
<form action="" id="deleteFrm" method="POST">_x000D_
  <a id="btnSubmit">Submit</a>_x000D_
</form>
_x000D_
_x000D_
_x000D_

How to get anchor text/href on click using jQuery?

Edited to reflect update to question

$(document).ready(function() {
    $(".res a").click(function() {
        alert($(this).attr("href"));
    });
});

How do you find all subclasses of a given class in Java?

There is no other way to do it other than what you described. Think about it - how can anyone know what classes extend ClassX without scanning each class on the classpath?

Eclipse can only tell you about the super and subclasses in what seems to be an "efficient" amount of time because it already has all of the type data loaded at the point where you press the "Display in Type Hierarchy" button (since it is constantly compiling your classes, knows about everything on the classpath, etc).

Laravel - Form Input - Multiple select for a one to many relationship

My solution, it´s make with jquery-chosen and bootstrap, the id is for jquery chosen, tested and working, I had problems concatenating @foreach but now work with a double @foreach and double @if:

  <div class="form-group">
    <label for="tagLabel">Tags: </label>
    <select multiple class="chosen-tag" id="tagLabel" name="tag_id[]" required>
      @foreach($tags as $id => $name)
        @if (is_array(Request::old('tag_id')))
                <option value="{{ $id }}" 
                @foreach (Request::old('tag_id') as $idold)
                  @if($idold==$id)
                    selected
                  @endif 
                @endforeach
                style="padding:5px;">{{ $name }}</option>
        @else
          <option value="{{ $id }}" style="padding:5px;">{{ $name }}</option>
        @endif
      @endforeach
    </select>
  </div>

this is the code por jquery chosen (the blade.php code doesn´t need this code to work)

    $(".chosen-tag").chosen({
  placeholder_text_multiple: "Selecciona alguna etiqueta",
  no_results_text: "No hay resultados para la busqueda",
  search_contains: true,
  width: '500px'
});

Linq to SQL how to do "where [column] in (list of values)"

I had been using the method in Jon Skeet's answer, but another one occurred to me using Concat. The Concat method performed slightly better in a limited test, but it's a hassle and I'll probably just stick with Contains, or maybe I'll write a helper method to do this for me. Either way, here's another option if anyone is interested:

The Method

// Given an array of id's
var ids = new Guid[] { ... };

// and a DataContext
var dc = new MyDataContext();

// start the queryable
var query = (
    from thing in dc.Things
    where thing.Id == ids[ 0 ]
    select thing 
);

// then, for each other id
for( var i = 1; i < ids.Count(); i++ ) {
    // select that thing and concat to queryable
    query.Concat(
        from thing in dc.Things
        where thing.Id == ids[ i ]
        select thing
    );
}

Performance Test

This was not remotely scientific. I imagine your database structure and the number of IDs involved in the list would have a significant impact.

I set up a test where I did 100 trials each of Concat and Contains where each trial involved selecting 25 rows specified by a randomized list of primary keys. I've run this about a dozen times, and most times the Concat method comes out 5 - 10% faster, although one time the Contains method won by just a smidgen.

Displaying the Error Messages in Laravel after being Redirected from controller

Below input field I include additional view:

@include('input-errors', ['inputName' => 'inputName']) #For your case it would be 'email'

input-errors.blade.php

@foreach ($errors->get($inputName) as $message)
    <span class="input-error">{{ $message }}</span>
@endforeach

CSS - adds red color to the message.

.input-error {
    color: #ff5555;
}

Best way to do Version Control for MS Excel

After searching for ages and trying out many different tools, I've found my answer to the vba version control problem here: https://stackoverflow.com/a/25984759/2780179

It's a simple excel addin for which the code can be found here

There are no duplicate modules after importing. It exports your code automatically, as soon as you save your workbook, without modifying any existing workbooks. It comes together with a vba code formatter.

No 'Access-Control-Allow-Origin' - Node / Apache Port Issue

Hi this happens when the front end and backend is running on different ports. The browser blocks the responses from the backend due to the absence on CORS headers. The solution is to make add the CORS headers in the backend request. The easiest way is to use cors npm package.

var express = require('express')
var cors = require('cors')
var app = express()
app.use(cors())

This will enable CORS headers in all your request. For more information you can refer to cors documentation

https://www.npmjs.com/package/cors

Getting the last element of a split string array

 
var title = 'fdfdsg dsgdfh dgdh dsgdh tyu hjuk yjuk uyk hjg fhjg hjj tytutdfsf sdgsdg dsfsdgvf dfgfdhdn dfgilkj,n, jhk jsu wheiu sjldsf dfdsf hfdkdjf dfhdfkd hsfd ,dsfk dfjdf ,yier djsgyi kds';
var shortText = $.trim(title).substring(1000, 150).split(" ").slice(0, -1).join(" ") + "...More >>";

Convert seconds into days, hours, minutes and seconds

 
a=int(input("Enter your number by seconds "))
d=a//(24*3600)   #Days
h=a//(60*60)%24  #hours
m=a//60%60       #minutes
s=a%60           #seconds
print("Days ",d,"hours ",h,"minutes ",m,"seconds ",s)

Can't connect to MySQL server on 'localhost' (10061)

Another possibility:

There are two ways the MySQL client can connect to the server: over TCP/IP, or using sockets. It's possible you have your MySQL server configured to support socket connections, but not network connections.

Setting a minimum/maximum character count for any character using a regular expression

If you also want to match newlines, then you might want to use "^[\s\S]{1,35}$" (depending on the regex engine). Otherwise, as others have said, you should used "^.{1,35}$"

Is there any "font smoothing" in Google Chrome?

Chrome doesn't render the fonts like Firefox or any other browser does. This is generally a problem in Chrome running on Windows only. If you want to make the fonts smooth, use the -webkit-font-smoothing property on yer h4 tags like this.

h4 {
    -webkit-font-smoothing: antialiased;
}

You can also use subpixel-antialiased, this will give you different type of smoothing (making the text a little blurry/shadowed). However, you will need a nightly version to see the effects. You can learn more about font smoothing here.

Find unique rows in numpy.array

np.unique when I run it on np.random.random(100).reshape(10,10) returns all the unique individual elements, but you want the unique rows, so first you need to put them into tuples:

array = #your numpy array of lists
new_array = [tuple(row) for row in array]
uniques = np.unique(new_array)

That is the only way I see you changing the types to do what you want, and I am not sure if the list iteration to change to tuples is okay with your "not looping through"

Converting to upper and lower case in Java

 
String a = "ABCD"

using this

a.toLowerCase();

all letters will convert to simple, "abcd"
using this

a.toUpperCase()

all letters will convert to Capital, "ABCD"

this conver first letter to capital:

a.substring(0,1).toUpperCase()

this conver other letter Simple 

a.substring(1).toLowerCase();

we can get sum of these two

a.substring(0,1).toUpperCase() + a.substring(1).toLowerCase();

result = "Abcd"

How to convert float to varchar in SQL Server

 
SELECT LTRIM(STR(float_field, 25, 0))

is the best way so you do not add .0000 and any digit at the end of the value.

How can I post data as form data instead of a request payload?

AngularJS is doing it right as it doing the following content-type inside the http-request header:

Content-Type: application/json

If you are going with php like me, or even with Symfony2 you can simply extend your server compatibility for the json standard like described here: http://silex.sensiolabs.org/doc/cookbook/json_request_body.html

The Symfony2 way (e.g. inside your DefaultController):

$request = $this->getRequest();
if (0 === strpos($request->headers->get('Content-Type'), 'application/json')) {
    $data = json_decode($request->getContent(), true);
    $request->request->replace(is_array($data) ? $data : array());
}
var_dump($request->request->all());

The advantage would be, that you dont need to use jQuery param and you could use AngularJS its native way of doing such requests.

cell format round and display 2 decimal places

Input: 0 0.1 1000

=FIXED(E5,2)

Output: 0.00 0.10 1,000.00

=TEXT(E5,"0.00")

Output: 0.00 0.10 1000.00

Note: As you can see FIXED add a coma after a thousand, where TEXT does not.

Loop and get key/value pair for JSON array using jQuery

The following should work for a JSON returned string. It will also work for an associative array of data.

for (var key in data)
     alert(key + ' is ' + data[key]);

Import / Export database with SQL Server Server Management Studio

I wanted to share with you my solution to export a database with Microsoft SQL Server Management Studio.

To Export your database

  1. Open a new request
  2. Copy paste this script
DECLARE @BackupFile NVARCHAR(255);
SET @BackupFile = 'c:\database-backup_2020.07.22.bak';
PRINT @BackupFile;
BACKUP DATABASE [%databaseName%] TO DISK = @BackupFile;

Don't forget to replace %databaseName% with the name of the database you want to export.

Note that this method gives a lighter file than from the menu.

To import this file from SQL Server Management Studio. Don't forget to delete your database beforehand.

  1. Click restore database

Click restore database

  1. Add the backup file Add the backup file

  2. Validate

Enjoy! :) :)

how to set the background color of the whole page in css

_x000D_
_x000D_ 
<html>_x000D_
  <head>_x000D_
    <title>_x000D_
        webpage_x000D_
      </title>_x000D_
</head>_x000D_
  <body style="background-color:blue;text-align:center">_x000D_
    welcome to my page_x000D_
    </body>_x000D_
  </html>
_x000D_
_x000D_
_x000D_

How to create an HTTPS server in Node.js?

If you need it only locally for local development, I've created utility exactly for this task - https://github.com/pie6k/easy-https

import { createHttpsDevServer } from 'easy-https';

async function start() {
  const server = await createHttpsDevServer(
    async (req, res) => {
      res.statusCode = 200;
      res.write('ok');
      res.end();
    },
    {
      domain: 'my-app.dev',
      port: 3000,
      subdomains: ['test'], // will add support for test.my-app.dev
      openBrowser: true,
    },
  );
}

start();

It:

  • Will automatically add proper domain entries to /etc/hosts
  • Will ask you for admin password only if needed on first run / domain change
  • Will prepare https certificates for given domains
  • Will trust those certificates on your local machine
  • Will open the browser on start pointing to your local server https url

What's the difference between Unicode and UTF-8?

most editors support save as ‘Unicode’ encoding actually.

This is an unfortunate misnaming perpetrated by Windows.

Because Windows uses UTF-16LE encoding internally as the memory storage format for Unicode strings, it considers this to be the natural encoding of Unicode text. In the Windows world, there are ANSI strings (the system codepage on the current machine, subject to total unportability) and there are Unicode strings (stored internally as UTF-16LE).

This was all devised in the early days of Unicode, before we realised that UCS-2 wasn't enough, and before UTF-8 was invented. This is why Windows's support for UTF-8 is all-round poor.

This misguided naming scheme became part of the user interface. A text editor that uses Windows's encoding support to provide a range of encodings will automatically and inappropriately describe UTF-16LE as “Unicode”, and UTF-16BE, if provided, as “Unicode big-endian”.

(Other editors that do encodings themselves, like Notepad++, don't have this problem.)

If it makes you feel any better about it, ‘ANSI’ strings aren't based on any ANSI standard, either.

Pandas get the most frequent values of a column

You could use .apply and pd.value_counts to get a count the occurrence of all the names in the name column.

dataframe['name'].apply(pd.value_counts)

Caused by: org.flywaydb.core.api.FlywayException: Validate failed. Migration Checksum mismatch for migration 2

I had the same issue and tried all the options (delete schema, delete specific row, update checksum) but nothing works.

In my case flyway-core dependency got corrupted somehow.

Solution:

  1. Delete flyway-core folder from ~.m2\local repository path...\org\flywaydb\flyway-core.

  2. Execute "maven clean install" so that it will download new one and add it into a project.

I hope this will help.

Bash script processing limited number of commands in parallel

In fact, xargs can run commands in parallel for you. There is a special -P max_procs command-line option for that. See man xargs.

Xcode error - Thread 1: signal SIGABRT

You are trying to load a XIB named DetailViewController, but no such XIB exists or it's not member of your current target.

How to customize listview using baseadapter

 
private class ObjectAdapter extends BaseAdapter {

    private Context context;
    private List<Object>objects;

    public ObjectAdapter(Context context, List<Object> objects) {
        this.context = context;
        this.objects = objects;
    }

    @Override
    public int getCount() {
        return objects.size();
    }

    @Override
    public Object getItem(int position) {
        return objects.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;

        if(convertView==null){
            holder = new ViewHolder();
            convertView = LayoutInflater.from(context).inflate(android.R.layout.simple_list_item_1, parent, false);
            holder.text = (TextView) convertView.findViewById(android.R.id.text1);
            convertView.setTag(holder);
        }else{
            holder = (ViewHolder) convertView.getTag();
        }

        holder.text.setText(getItem(position).toString()));
        return convertView;
    }

    class ViewHolder {
        TextView text;
    }
}

How can I change Eclipse theme?

The best way to Install new themes in any Eclipse platform is to use the Eclipse Marketplace.

1.Go to Help > Eclipse Marketplace

2.Search for "Color Themes"

3.Install and Restart

4.Go to Window > Preferences > General > Appearance > Color Themes

5.Select anyone and Apply. Restart.

Python concatenate text files

Use shutil.copyfileobj.

It automatically reads the input files chunk by chunk for you, which is more more efficient and reading the input files in and will work even if some of the input files are too large to fit into memory:

import shutil

with open('output_file.txt','wb') as wfd:
    for f in ['seg1.txt','seg2.txt','seg3.txt']:
        with open(f,'rb') as fd:
            shutil.copyfileobj(fd, wfd)

Session timeout in ASP.NET

Use the following code block in your web.config file. Here default session time out is 80 mins.

<system.web>
 <sessionState mode="InProc" cookieless="false" timeout="80" />
</system.web>

Use the following link for Session Timeout with popup alert message.

Session Timeout Example

FYI:The above examples is done with devexpress popup control so you need to customize/replace devexpress popup control with normal popup control. If your using devexpress no need to customize

How to do a FULL OUTER JOIN in MySQL?

You don't have FULL JOINS on MySQL, but you can sure emulate them.

For a code SAMPLE transcribed from this SO question you have:

with two tables t1, t2:

SELECT * FROM t1
LEFT JOIN t2 ON t1.id = t2.id
UNION
SELECT * FROM t1
RIGHT JOIN t2 ON t1.id = t2.id

The query above works for special cases where a FULL OUTER JOIN operation would not produce any duplicate rows. The query above depends on the UNION set operator to remove duplicate rows introduced by the query pattern. We can avoid introducing duplicate rows by using an anti-join pattern for the second query, and then use a UNION ALL set operator to combine the two sets. In the more general case, where a FULL OUTER JOIN would return duplicate rows, we can do this:

SELECT * FROM t1
LEFT JOIN t2 ON t1.id = t2.id
UNION ALL
SELECT * FROM t1
RIGHT JOIN t2 ON t1.id = t2.id
WHERE t1.id IS NULL

UnicodeDecodeError: 'ascii' codec can't decode byte 0xef in position 1

My +1 to mata's comment at https://stackoverflow.com/a/10561979/1346705 and to the Nick Craig-Wood's demonstration. You have decoded the string correctly. The problem is with the print command as it converts the Unicode string to the console encoding, and the console is not capable to display the string. Try to write the string into a file and look at the result using some decent editor that supports Unicode:

import codecs

s = '(\xef\xbd\xa1\xef\xbd\xa5\xcf\x89\xef\xbd\xa5\xef\xbd\xa1)\xef\xbe\x89'
s1 = s.decode('utf-8')
f = codecs.open('out.txt', 'w', encoding='utf-8')
f.write(s1)
f.close()

Then you will see (?????)?.

How to improve a case statement that uses two columns

You could do it this way: 

-- Notice how STATE got moved inside the condition:
CASE WHEN STATE = 2 AND RetailerProcessType IN (1, 2) THEN '"AUTHORISED"'
     WHEN STATE = 1 AND RetailerProcessType = 2 THEN '"PENDING"'
     ELSE '"DECLINED"'
END

The reason you can do an AND here is that you are not checking the CASE of STATE, but instead you are CASING Conditions.

The key part here is that the STATE condition is a part of the WHEN.

AJAX Mailchimp signup form integration

Based on gbinflames' answer, this is what worked for me:

Generate a simple mailchimp list sign up form , copy the action URL and method (post) to your custom form. Also rename your form field names to all capital ( name='EMAIL' as in original mailchimp code, EMAIL,FNAME,LNAME,... ), then use this:

      $form=$('#your-subscribe-form'); // use any lookup method at your convenience

      $.ajax({
      type: $form.attr('method'),
      url: $form.attr('action').replace('/post?', '/post-json?').concat('&c=?'),
      data: $form.serialize(),
      timeout: 5000, // Set timeout value, 5 seconds
      cache       : false,
      dataType    : 'jsonp',
      contentType: "application/json; charset=utf-8",
      error       : function(err) { // put user friendly connection error message  },
      success     : function(data) {
          if (data.result != "success") {
              // mailchimp returned error, check data.msg
          } else {
              // It worked, carry on...
          }
      }

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

How are you generating your data?

See how the output shows that your data is of 'object' type? the groupby operations specifically check whether each column is a numeric dtype first.

In [31]: data
Out[31]: 
<class 'pandas.core.frame.DataFrame'>
DatetimeIndex: 2557 entries, 2004-01-01 00:00:00 to 2010-12-31 00:00:00
Freq: <1 DateOffset>
Columns: 360 entries, -89.75 to 89.75
dtypes: object(360)

look ?


Did you initialize an empty DataFrame first and then filled it? If so that's probably why it changed with the new version as before 0.9 empty DataFrames were initialized to float type but now they are of object type. If so you can change the initialization to DataFrame(dtype=float).

You can also call frame.astype(float)

Escape Character in SQL Server

You can escape quotation like this:

select 'it''s escaped'

result will be

it's escaped

Set icon for Android application

Place your images in drawables folder under either of the three and set it like this.

Code

<application android:icon="@drawable/your_icon" >
.... 
</application>

Compression/Decompression string with C#

This is an updated version for .NET 4.5 and newer using async/await and IEnumerables:

public static class CompressionExtensions
{
    public static async Task<IEnumerable<byte>> Zip(this object obj)
    {
        byte[] bytes = obj.Serialize();

        using (MemoryStream msi = new MemoryStream(bytes))
        using (MemoryStream mso = new MemoryStream())
        {
            using (var gs = new GZipStream(mso, CompressionMode.Compress))
                await msi.CopyToAsync(gs);

            return mso.ToArray().AsEnumerable();
        }
    }

    public static async Task<object> Unzip(this byte[] bytes)
    {
        using (MemoryStream msi = new MemoryStream(bytes))
        using (MemoryStream mso = new MemoryStream())
        {
            using (var gs = new GZipStream(msi, CompressionMode.Decompress))
            {
                // Sync example:
                //gs.CopyTo(mso);

                // Async way (take care of using async keyword on the method definition)
                await gs.CopyToAsync(mso);
            }

            return mso.ToArray().Deserialize();
        }
    }
}

public static class SerializerExtensions
{
    public static byte[] Serialize<T>(this T objectToWrite)
    {
        using (MemoryStream stream = new MemoryStream())
        {
            BinaryFormatter binaryFormatter = new BinaryFormatter();
            binaryFormatter.Serialize(stream, objectToWrite);

            return stream.GetBuffer();
        }
    }

    public static async Task<T> _Deserialize<T>(this byte[] arr)
    {
        using (MemoryStream stream = new MemoryStream())
        {
            BinaryFormatter binaryFormatter = new BinaryFormatter();
            await stream.WriteAsync(arr, 0, arr.Length);
            stream.Position = 0;

            return (T)binaryFormatter.Deserialize(stream);
        }
    }

    public static async Task<object> Deserialize(this byte[] arr)
    {
        object obj = await arr._Deserialize<object>();
        return obj;
    }
}

With this you can serialize everything BinaryFormatter supports, instead only of strings.

Edit:

In case, you need take care of Encoding, you could just use Convert.ToBase64String(byte[])...

Take a look at this answer if you need an example!

How to include css files in Vue 2

Try using the @ symbol before the url string. Import your css in the following manner:

import Vue from 'vue'

require('@/assets/styles/main.css')

In your App.vue file you can do this to import a css file in the style tag

<template>
  <div>
  </div>
</template>

<style scoped src="@/assets/styles/mystyles.css">
</style>

Find the server name for an Oracle database

I use this query in order to retrieve the server name of my Oracle database.

SELECT program FROM v$session WHERE program LIKE '%(PMON)%';

Conditional operator in Python?

simple is the best and works in every version.

if a>10: 
    value="b"
else: 
    value="c"

What does "fatal: bad revision" mean?

If you only want to revert a single file to its state in a given commit, you actually want to use the checkout command:

git checkout HEAD~2 myFile

The revert command is used for reverting entire commits (and it doesn't revert you to that commit; it actually just reverts the changes made by that commit - if you have another commit after the one you specify, the later commit won't be reverted).

Nodejs - Redirect url

Use the following code this works fine in Native Nodejs 

http.createServer(function (req, res) {
var q = url.parse(req.url, true);
if (q.pathname === '/') {
  //Home page code
} else if (q.pathname === '/redirect-to-google') {
  res.writeHead(301, { "Location": "http://google.com/" });
  return res.end();
} else if (q.pathname === '/redirect-to-interal-page') {
  res.writeHead(301, { "Location": "/path/within/site" });
  return res.end();
} else {
    //404 page code
}
res.end();
}).listen(8080);

trace a particular IP and port

it can be done by using this command: tcptraceroute -p destination port destination IP. like: tcptraceroute -p 9100 10.0.0.50 but don't forget to install tcptraceroute package on your system. tcpdump and nc by default installed on the system. regards

BadValue Invalid or no user locale set. Please ensure LANG and/or LC_* environment variables are set correctly

adding the following lines to my /etc/environment file worked

LC_ALL=en_US.UTF-8
LANG=en_US.UTF-8

Using the Jersey client to do a POST operation

Not done this yet myself, but a quick bit of Google-Fu reveals a tech tip on blogs.oracle.com with examples of exactly what you ask for.

Example taken from the blog post:

MultivaluedMap formData = new MultivaluedMapImpl();
formData.add("name1", "val1");
formData.add("name2", "val2");
ClientResponse response = webResource
    .type(MediaType.APPLICATION_FORM_URLENCODED_TYPE)
    .post(ClientResponse.class, formData);

That any help?

How can I discard remote changes and mark a file as "resolved"?

Make sure of the conflict origin: if it is the result of a git merge, see Brian Campbell's answer.

But if is the result of a git rebase, in order to discard remote (their) changes and use local changes, you would have to do a:

git checkout --theirs -- .

See "Why is the meaning of “ours” and “theirs” reversed"" to see how ours and theirs are swapped during a rebase (because the upstream branch is checked out).

Is there an "exists" function for jQuery?

By default - No.

There's the length property that is commonly used for the same result in the following way:

if ($(selector).length)

Here, 'selector' is to be replaced by the actual selector you are interested to find if it exists or not. If it does exist, the length property will output an integer more than 0 and hence the if statement will become true and hence execute the if block. If it doesn't, it will output the integer '0' and hence the if block won't get executed.

How To: Execute command line in C#, get STD OUT results

In case you also need to execute some command in the cmd.exe, you can do the following:

// Start the child process.
Process p = new Process();
// Redirect the output stream of the child process.
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.FileName = "cmd.exe";
p.StartInfo.Arguments = "/C vol";
p.Start();
// Read the output stream first and then wait.
string output = p.StandardOutput.ReadToEnd();
p.WaitForExit();
Console.WriteLine(output);

This returns just the output of the command itself:

enter image description here

You can also use StandardInput instead of StartInfo.Arguments:

// Start the child process.
Process p = new Process();
// Redirect the output stream of the child process.
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardInput = true;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.FileName = "cmd.exe";
p.Start();
// Read the output stream first and then wait.
p.StandardInput.WriteLine("vol");
p.StandardInput.WriteLine("exit");
string output = p.StandardOutput.ReadToEnd();
p.WaitForExit();
Console.WriteLine(output);

The result looks like this:

enter image description here

Is there Selected Tab Changed Event in the standard WPF Tab Control

If you set the x:Name property to each TabItem as:

<TabControl x:Name="MyTab" SelectionChanged="TabControl_SelectionChanged">
    <TabItem x:Name="MyTabItem1" Header="One"/>
    <TabItem x:Name="MyTabItem2" Header="2"/>
    <TabItem x:Name="MyTabItem3" Header="Three"/>
</TabControl>

Then you can access to each TabItem at the event:

private void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    if (MyTabItem1.IsSelected)
    // do your stuff
    if (MyTabItem2.IsSelected)
    // do your stuff
    if (MyTabItem3.IsSelected)
    // do your stuff
}

Is it possible to insert HTML content in XML document?

so long as your html content doesn't need to contain a CDATA element, you can contain the HTML in a CDATA element, otherwise you'll have to escape the XML entities.

<element><![CDATA[<p>your html here</p>]]></element>

VS

<element>&lt;p&gt;your html here&lt;/p&gt;</element>

call javascript function onchange event of dropdown list

jsFunction is not in good closure. change to:

jsFunction = function(value)
{
    alert(value);
}

and don't use global variables and functions, change it into module

How can I check if two segments intersect?

Based on Liran's and Grumdrig's excellent answers here is a complete Python code to verify if closed segments do intersect. Works for collinear segments, segments parallel to axis Y, degenerate segments (devil is in details). Assumes integer coordinates. Floating point coordinates require a modification to points equality test.

def side(a,b,c):
    """ Returns a position of the point c relative to the line going through a and b
        Points a, b are expected to be different
    """
    d = (c[1]-a[1])*(b[0]-a[0]) - (b[1]-a[1])*(c[0]-a[0])
    return 1 if d > 0 else (-1 if d < 0 else 0)

def is_point_in_closed_segment(a, b, c):
    """ Returns True if c is inside closed segment, False otherwise.
        a, b, c are expected to be collinear
    """
    if a[0] < b[0]:
        return a[0] <= c[0] and c[0] <= b[0]
    if b[0] < a[0]:
        return b[0] <= c[0] and c[0] <= a[0]

    if a[1] < b[1]:
        return a[1] <= c[1] and c[1] <= b[1]
    if b[1] < a[1]:
        return b[1] <= c[1] and c[1] <= a[1]

    return a[0] == c[0] and a[1] == c[1]

#
def closed_segment_intersect(a,b,c,d):
    """ Verifies if closed segments a, b, c, d do intersect.
    """
    if a == b:
        return a == c or a == d
    if c == d:
        return c == a or c == b

    s1 = side(a,b,c)
    s2 = side(a,b,d)

    # All points are collinear
    if s1 == 0 and s2 == 0:
        return \
            is_point_in_closed_segment(a, b, c) or is_point_in_closed_segment(a, b, d) or \
            is_point_in_closed_segment(c, d, a) or is_point_in_closed_segment(c, d, b)

    # No touching and on the same side
    if s1 and s1 == s2:
        return False

    s1 = side(c,d,a)
    s2 = side(c,d,b)

    # No touching and on the same side
    if s1 and s1 == s2:
        return False

    return True

Format numbers in JavaScript similar to C#

If you don't want to use jQuery, take a look at Numeral.js

Create html documentation for C# code

This page might interest you: http://msdn.microsoft.com/en-us/magazine/dd722812.aspx

You can generate the XML documentation file using either the command-line compiler or through the Visual Studio interface. If you are compiling with the command-line compiler, use options /doc or /doc+. That will generate an XML file by the same name and in the same path as the assembly. To specify a different file name, use /doc:file.

If you are using the Visual Studio interface, there's a setting that controls whether the XML documentation file is generated. To set it, double-click My Project in Solution Explorer to open the Project Designer. Navigate to the Compile tab. Find "Generate XML documentation file" at the bottom of the window, and make sure it is checked. By default this setting is on. It generates an XML file using the same name and path as the assembly.

How to detect control+click in Javascript from an onclick div attribute?

Try this:

var control = false;
$(document).on('keyup keydown', function(e) {
  control = e.ctrlKey;
});

$('div#1').on('click', function() {
  if (control) {
    // control-click
  } else {
    // single-click
  }
});

And the right-click triggers a contextmenu event, so:

$('div#1').on('contextmenu', function() {
  // right-click handler
})

Entity Framework - Include Multiple Levels of Properties

Let me state it clearly that you can use the string overload to include nested levels regardless of the multiplicities of the corresponding relationships, if you don't mind using string literals:

query.Include("Collection.Property")

Download/Stream file from URL - asp.net

2 years later, I used Dallas' answer, but I had to change the HttpWebRequest to FileWebRequest since I was linking to direct files. Not sure if this is the case everywhere, but I figured I'd add it. Also, I removed

var resp = Http.Current.Resonse

and just used Http.Current.Response in place wherever resp was referenced.

Reliable way to convert a file to a byte[]

All these answers with .ReadAllBytes(). Another, similar (I won't say duplicate, since they were trying to refactor their code) question was asked on SO here: Best way to read a large file into a byte array in C#?

A comment was made on one of the posts regarding .ReadAllBytes():

File.ReadAllBytes throws OutOfMemoryException with big files (tested with 630 MB file 
and it failed) – juanjo.arana Mar 13 '13 at 1:31

A better approach, to me, would be something like this, with BinaryReader:

public static byte[] FileToByteArray(string fileName)
{
    byte[] fileData = null;

    using (FileStream fs = File.OpenRead(fileName)) 
    { 
        var binaryReader = new BinaryReader(fs); 
        fileData = binaryReader.ReadBytes((int)fs.Length); 
    }
    return fileData;
}

But that's just me...

Of course, this all assumes you have the memory to handle the byte[] once it is read in, and I didn't put in the File.Exists check to ensure the file is there before proceeding, as you'd do that before calling this code.

WCFTestClient The HTTP request is unauthorized with client authentication scheme 'Anonymous'

Here's what I had to do to get this working. This means:

  1. Custom UserNamePasswordValidator (no need for a Windows account, SQLServer or ActiveDirectory -- your UserNamePasswordValidator could have username & password hardcoded, or read it from a text file, MySQL or whatever).
  2. https
  3. IIS7
  4. .net 4.0

My site is managed through DotNetPanel. It has 3 security options for virtual directories:

  1. Allow Anonymous Access
  2. Enable Basic Authentication
  3. Enable Integrated Windows Authentication

Only "Allow Anonymous Access" is needed (although, that, by itself wasn't enough).

Setting

proxy.ClientCredentials.Windows.AllowedImpersonationLevel =  System.Security.Principal.TokenImpersonationLevel.Impersonation;

Didn't make a difference in my case.

However, using this binding worked:

      <security mode="TransportWithMessageCredential">
        <transport clientCredentialType="Windows" />
        <message clientCredentialType="UserName" />
      </security>

How to pretty print XML from the command line?

libxml2-utils

This utility comes with libxml2-utils:

echo '<root><foo a="b">lorem</foo><bar value="ipsum" /></root>' |
    xmllint --format -

Perl's XML::Twig

This command comes with XML::Twig module, sometimes xml-twig-tools package:

echo '<root><foo a="b">lorem</foo><bar value="ipsum" /></root>' |
    xml_pp

xmlstarlet

This command comes with xmlstarlet:

echo '<root><foo a="b">lorem</foo><bar value="ipsum" /></root>' |
    xmlstarlet format --indent-tab

tidy

Check the tidy package:

echo '<root><foo a="b">lorem</foo><bar value="ipsum" /></root>' |
    tidy -xml -i -

Python

Python's xml.dom.minidom can format XML (both python2 and python3):

echo '<root><foo a="b">lorem</foo><bar value="ipsum" /></root>' |
    python -c 'import sys;import xml.dom.minidom;s=sys.stdin.read();print(xml.dom.minidom.parseString(s).toprettyxml())'

saxon-lint

You need saxon-lint:

echo '<root><foo a="b">lorem</foo><bar value="ipsum" /></root>' |
    saxon-lint --indent --xpath '/' -

saxon-HE

You need saxon-HE:

 echo '<root><foo a="b">lorem</foo><bar value="ipsum" /></root>' |
    java -cp /usr/share/java/saxon/saxon9he.jar net.sf.saxon.Query \
    -s:- -qs:/ '!indent=yes'

Replacing NULL and empty string within Select statement

Try this

COALESCE(NULLIF(Address.COUNTRY,''), 'United States')

What Does 'zoom' do in CSS?

As Joshua M pointed out, the zoom function isn't supported only in Firefox, but you can simply fix this as shown:

div.zoom {
  zoom: 2; /* all browsers */
 -moz-transform: scale(2);  /* Firefox */
}

What are the pros and cons of parquet format compared to other formats?

Tom's answer is quite detailed and exhaustive but you may also be interested in this simple study about Parquet vs Avro done at Allstate Insurance, summarized here:

"Overall, Parquet showed either similar or better results on every test [than Avro]. The query-performance differences on the larger datasets in Parquet’s favor are partly due to the compression results; when querying the wide dataset, Spark had to read 3.5x less data for Parquet than Avro. Avro did not perform well when processing the entire dataset, as suspected."

Pass a reference to DOM object with ng-click

While you do the following, technically speaking:

<button ng-click="doSomething($event)"></button>

// In controller:
$scope.doSomething = function($event) {
  //reference to the button that triggered the function:
  $event.target
};

This is probably something you don't want to do as AngularJS philosophy is to focus on model manipulation and let AngularJS do the rendering (based on hints from the declarative UI). Manipulating DOM elements and attributes from a controller is a big no-no in AngularJS world.

You might check this answer for more info: https://stackoverflow.com/a/12431211/1418796

Error 0x80005000 and DirectoryServices

In the context of Ektron, this issue is resolved by installing the "IIS6 Metabase compatibility" feature in Windows:

Check 'Windows features' or 'Role Services' for IIS6 Metabase compatibility, add if missing:

enter image description here

Ref: https://portal.ektron.com/KB/1088/

git remote add with other SSH port

Best answer doesn't work for me. I needed ssh:// from the beggining.

# does not work
git remote set-url origin [email protected]:10000/aaa/bbbb/ccc.git
# work
git remote set-url origin ssh://[email protected]:10000/aaa/bbbb/ccc.git

Simple Random Samples from a Sql database

Maybe you could do

SELECT * FROM table LIMIT 10000 OFFSET FLOOR(RAND() * 190000)

Convert iterator to pointer?

The direct answer to your question is yes. If foo is a vector, you can do this: &foo[1].

This only works for vectors however, because the standard says that vectors implement storage by using contigious memory.

But you still can (and probably should) pass iterators instead of raw pointers because it is more expressive. Passing iterators does not make a copy of the vector.

CSS On hover show another element

It is indeed possible with the following code

 <div href="#" id='a'>
     Hover me
 </div>

<div id='b'>
    Show me
</div>

and css

#a {
  display: block;
}

#a:hover + #b {
  display:block;
}

#b {
  display:none;
  }

Now by hovering on element #a shows element #b.

Request string without GET arguments

Here is a solution that takes into account different ports and https:

$pageURL = (@$_SERVER['HTTPS'] == 'on') ? 'https://' : 'http://';

if ($_SERVER['SERVER_PORT'] != '80')
  $pageURL .= $_SERVER['SERVER_NAME'].':'.$_SERVER['SERVER_PORT'].$_SERVER['PHP_SELF'];
else 
  $pageURL .= $_SERVER['SERVER_NAME'].$_SERVER['PHP_SELF'];

Or a more basic solution that does not take other ports into account:

$pageURL = (@$_SERVER['HTTPS'] == 'on') ? 'https://' : 'http://';
$pageURL .= $_SERVER['SERVER_NAME'].$_SERVER['PHP_SELF'];

Converting JSON to XLS/CSV in Java

A JSON document basically consists of lists and dictionaries. There is no obvious way to map such a datastructure on a two-dimensional table.

jquery : focus to div is not working

you can use the below code to bring focus to a div, in this example the page scrolls to the <div id="navigation">

$('html, body').animate({ scrollTop: $('#navigation').offset().top }, 'slow');

Allow Google Chrome to use XMLHttpRequest to load a URL from a local file

Using --disable-web-security switch is quite dangerous! Why disable security at all while you can just allow XMLHttpRequest to access files from other files using --allow-file-access-from-files switch?

Before using these commands be sure to end all running instances of Chrome.

On Windows:

chrome.exe --allow-file-access-from-files

On Mac:

open /Applications/Google\ Chrome.app/ --args --allow-file-access-from-files

Discussions of this "feature" of Chrome:

How to program a delay in Swift 3

Try the below code for delay

//MARK: First Way

func delayForWork() {
    delay(3.0) {
        print("delay for 3.0 second")
    }
}

delayForWork()

// MARK: Second Way

DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
    // your code here delayed by 0.5 seconds
}