#Preloader | Programs & Examples on Preloader

Preloading CSS Images

If the page elements and their background images are already in the DOM (i.e. you are not creating/changing them dynamically), then their background images will already be loaded. At that point, you may want to look at compression methods :)

html5 audio player - jquery toggle click play/pause?

if anyone else has problem with the above mentioned solutions, I ended up just going for the event:

$("#jquery_audioPlayer").jPlayer({
    ready:function () {
        $(this).jPlayer("setMedia", {
            mp3:"media/song.mp3"
        })
        ...
    pause: function () {
      $('#yoursoundcontrol').click(function () {
            $("#jquery_audioPlayer").jPlayer('play');
      })
    },
    play: function () {
    $('#yoursoundcontrol').click(function () {
            $("#jquery_audioPlayer").jPlayer('pause');
    })}
});

works for me.

How to count the occurrence of certain item in an ndarray?

What about len(y[y==0]) and len(y[y==1]) ?

VB.Net .Clear() or txtbox.Text = "" textbox clear methods

Clear() set the Text property to nothing. So txtbox1.Text = Nothing does the same thing as clear. An empty string (also available through String.Empty) is not a null reference, but has no value of course.

What does SQL clause "GROUP BY 1" mean?

It will group by first field in the select clause

Reading a .txt file using Scanner class in Java

File Path Seems to be an issue here please make sure that file exists in the correct directory or give the absolute path to make sure that you are pointing to a correct file. Please log the file.getAbsolutePath() to verify that file is correct.

Calling a particular PHP function on form submit

Write this code

<?php
    if(isset($_POST['submit'])){
        echo 'Hello World';
    } 
?>

<html>
     <body>
         <form method="post">
             <input type="text" name="studentname">
             <input type="submit" name="submit" value="click">
         </form>
     </body>
</html>

How long is the SHA256 hash?

A sha256 is 256 bits long -- as its name indicates.

Since sha256 returns a hexadecimal representation, 4 bits are enough to encode each character (instead of 8, like for ASCII), so 256 bits would represent 64 hex characters, therefore you need a varchar(64), or even a char(64), as the length is always the same, not varying at all.

And the demo :

$hash = hash('sha256', 'hello, world!');
var_dump($hash);

Will give you :

$ php temp.php
string(64) "68e656b251e67e8358bef8483ab0d51c6619f3e7a1a9f0e75838d41ff368f728"

i.e. a string with 64 characters.

Best way to check that element is not present using Selenium WebDriver with java

Use findElements instead of findElement.

findElements will return an empty list if no matching elements are found instead of an exception. Also, we can make sure that the element is present or not.

Ex: List elements = driver.findElements(By.yourlocatorstrategy);

if(elements.size()>0){
    do this..
 } else {
    do that..
 }

Bower: ENOGIT Git is not installed or not in the PATH

Adding Git to Windows 7/8/8.1 Path

Note: You must have msysgit installed on your machine. Also, the path to my Git installation is "C:\Program Files (x86)\Git". Yours might be different. Please check where yours is before continuing.

Open the Windows Environment Variables/Path Window.

Right-click on My Computer -> Properties
Click Advanced System Settings link from the left side column
Click Environment Variables in the bottom of the window
Then under System Variables look for the path variable and click edit
Add the pwd to Git's binary and cmd at the end of the string like this:
```
;%PROGRAMFILES(x86)%\Git\bin;%PROGRAMFILES(x86)%\Git\cmd
```

Now test it out in PowerShell. Type git and see if it recognizes the command.

This is image showing you how to do so!

Source: Adding Git to Windows 7 Path

Programmatically go back to the previous fragment in the backstack

Look at the getFragmentManager().popBackStack() methods (there are several to choose from)

http://developer.android.com/reference/android/app/FragmentManager.html#popBackStack()

SQL Server : Arithmetic overflow error converting expression to data type int

SELECT                          
    DATEPART(YEAR, dateTimeStamp) AS [Year]                         
    , DATEPART(MONTH, dateTimeStamp) AS [Month]                         
    , COUNT(*) AS NumStreams                        
    , [platform] AS [Platform]                      
    , deliverableName AS [Deliverable Name]                     
    , SUM(billableDuration) AS NumSecondsDelivered

Assuming that your quoted text is the exact text, one of these columns can't do the mathematical calculations that you want. Double click on the error and it will highlight the line that's causing the problems (if it's different than what's posted, it may not be up there); I tested your code with the variables and there was no problem, meaning that one of these columns (which we don't know more specific information about) is creating this error.

One of your expressions needs to be casted/converted to an int in order for this to go through, which is the meaning of Arithmetic overflow error converting expression to data type int.

How to use onResume()?

Re-review the Android Activity Lifecycle reference. There is a nice picture, and the table showing what methods get called. reference Link google

https://developer.android.com/reference/android/app/Activity.html

Can someone explain how to implement the jQuery File Upload plugin?

I've just spent 2 hours battling with jQuery Upload but gave up because of the amount of dependencies (I had 13 JS files included to get all the bells and whistles).

I did a bit more searching and came across a neat project called Dropzone.js, which does not have any dependencies.

The author has also created a bootstrap demo which was inspired by the jQuery File Upload plugin.

I hope this saves someone else some time.

`IF` statement with 3 possible answers each based on 3 different ranges

You need to use the AND function for the multiple conditions:

=IF(AND(A2>=75, A2<=79),0.255,IF(AND(A2>=80, X2<=84),0.327,IF(A2>=85,0.559,0)))

How to prevent scanf causing a buffer overflow in C?

Limiting the length of the input is definitely easier. You could accept an arbitrarily-long input by using a loop, reading in a bit at a time, re-allocating space for the string as necessary...

But that's a lot of work, so most C programmers just chop off the input at some arbitrary length. I suppose you know this already, but using fgets() isn't going to allow you to accept arbitrary amounts of text - you're still going to need to set a limit.

I want to get Year, Month, Day, etc from Java Date to compare with Gregorian Calendar date in Java. Is this possible?

Javascript communication between browser tabs/windows

This is an old answer, I suggest to use modern version described here:

Javascript; communication between tabs/windows with same origin

You can communicate between browser windows (and tabs too) using cookies.

Here is an example of sender and receiver:

sender.html

<h1>Sender</h1>

<p>Type into the text box below and watch the text 
   appear automatically in the receiver.</p>

<form name="sender">
<input type="text" name="message" size="30" value="">
<input type="reset" value="Clean">
</form>

<script type="text/javascript"><!--
function setCookie(value) {
    document.cookie = "cookie-msg-test=" + value + "; path=/";
    return true;
}
function updateMessage() {
    var t = document.forms['sender'].elements['message'];
    setCookie(t.value);
    setTimeout(updateMessage, 100);
}
updateMessage();
//--></script>

receiver.html:

<h1>Receiver</h1>

<p>Watch the text appear in the text box below as you type it in the sender.</p>

<form name="receiver">
<input type="text" name="message" size="30" value="" readonly disabled>
</form>

<script type="text/javascript"><!--
function getCookie() {
    var cname = "cookie-msg-test=";
    var ca = document.cookie.split(';');
    for (var i=0; i < ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(cname) == 0) {
            return c.substring(cname.length, c.length);
        }
    }
    return null;
}
function updateMessage() {
    var text = getCookie();
    document.forms['receiver'].elements['message'].value = text;
    setTimeout(updateMessage, 100);
}
updateMessage();
//--></script>

How to give a pandas/matplotlib bar graph custom colors

For a more detailed answer on creating your own colormaps, I highly suggest visiting this page

If that answer is too much work, you can quickly make your own list of colors and pass them to the color parameter. All the colormaps are in the cm matplotlib module. Let's get a list of 30 RGB (plus alpha) color values from the reversed inferno colormap. To do so, first get the colormap and then pass it a sequence of values between 0 and 1. Here, we use np.linspace to create 30 equally-spaced values between .4 and .8 that represent that portion of the colormap.

from matplotlib import cm
color = cm.inferno_r(np.linspace(.4, .8, 30))
color

array([[ 0.865006,  0.316822,  0.226055,  1.      ],
       [ 0.851384,  0.30226 ,  0.239636,  1.      ],
       [ 0.832299,  0.283913,  0.257383,  1.      ],
       [ 0.817341,  0.270954,  0.27039 ,  1.      ],
       [ 0.796607,  0.254728,  0.287264,  1.      ],
       [ 0.775059,  0.239667,  0.303526,  1.      ],
       [ 0.758422,  0.229097,  0.315266,  1.      ],
       [ 0.735683,  0.215906,  0.330245,  1.      ],
       .....

Then we can use this to plot, using the data from the original post:

import random
x = [{i: random.randint(1, 5)} for i in range(30)]
df = pd.DataFrame(x)
df.plot(kind='bar', stacked=True, color=color, legend=False, figsize=(12, 4))

SQL query for a carriage return in a string and ultimately removing carriage return

This also works

SELECT TRANSLATE(STRING_WITH_NL_CR, CHAR(10) || CHAR(13), '  ') FROM DUAL;

Reading multiple Scanner inputs

If every input asks the same question, you should use a for loop and an array of inputs:

Scanner dd = new Scanner(System.in);
int[] vars = new int[3];

for(int i = 0; i < vars.length; i++) {
  System.out.println("Enter next var: ");
  vars[i] = dd.nextInt();
}

Or as Chip suggested, you can parse the input from one line:

Scanner in = new Scanner(System.in);
int[] vars = new int[3];

System.out.println("Enter "+vars.length+" vars: ");
for(int i = 0; i < vars.length; i++)
  vars[i] = in.nextInt();

You were on the right track, and what you did works. This is just a nicer and more flexible way of doing things.

How to run an awk commands in Windows?

Go to command windows (cmd) then type:

"c:\Progam Files(x86)\GnuWin32\bin\awk"

Is there a way to detect if a browser window is not currently active?

this worked for me

document.addEventListener("visibilitychange", function() {
      document.title = document.hidden ? "I'm away" : "I'm here";
});

demo: https://iamsahilralkar.github.io/document-hidden-demo/

convert string array to string

A slightly faster option than using the already mentioned use of the Join() method is the Concat() method. It doesn't require an empty delimiter parameter as Join() does. Example:

string[] test = new string[2];
test[0] = "Hello ";
test[1] = "World!";

string result = String.Concat(test);

hence it is likely faster.

Mixing C# & VB In The Same Project

Although Visual Studio does not support this (you can do some tricks and get MSBuild to compile both, but not from within Visual Studio), SharpDevelop does. You can have both in the same solution (as long as you are running Visual Studio Professional and above), so the easiest solution if you want to keep using Visual Studio is to seperate your VB code into a different project and access it that way.

ElasticSearch, Sphinx, Lucene, Solr, Xapian. Which fits for which usage?

We use Lucene regularly to index and search tens of millions of documents. Searches are quick enough, and we use incremental updates that do not take a long time. It did take us some time to get here. The strong points of Lucene are its scalability, a large range of features and an active community of developers. Using bare Lucene requires programming in Java.

If you are starting afresh, the tool for you in the Lucene family is Solr, which is much easier to set up than bare Lucene, and has almost all of Lucene's power. It can import database documents easily. Solr are written in Java, so any modification of Solr requires Java knowledge, but you can do a lot just by tweaking configuration files.

I have also heard good things about Sphinx, especially in conjunction with a MySQL database. Have not used it, though.

IMO, you should choose according to:

The required functionality - e.g. do you need a French stemmer? Lucene and Solr have one, I do not know about the others.
Proficiency in the implementation language - Do not touch Java Lucene if you do not know Java. You may need C++ to do stuff with Sphinx. Lucene has also been ported into other languages. This is mostly important if you want to extend the search engine.
Ease of experimentation - I believe Solr is best in this aspect.
Interfacing with other software - Sphinx has a good interface with MySQL. Solr supports ruby, XML and JSON interfaces as a RESTful server. Lucene only gives you programmatic access through Java. Compass and Hibernate Search are wrappers of Lucene that integrate it into larger frameworks.

Find the closest ancestor element that has a specific class

Use element.closest()

https://developer.mozilla.org/en-US/docs/Web/API/Element/closest

See this example DOM:

<article>
  <div id="div-01">Here is div-01
    <div id="div-02">Here is div-02
      <div id="div-03">Here is div-03</div>
    </div>
  </div>
</article>

This is how you would use element.closest:

var el = document.getElementById('div-03');

var r1 = el.closest("#div-02");  
// returns the element with the id=div-02

var r2 = el.closest("div div");  
// returns the closest ancestor which is a div in div, here is div-03 itself

var r3 = el.closest("article > div");  
// returns the closest ancestor which is a div and has a parent article, here is div-01

var r4 = el.closest(":not(div)");
// returns the closest ancestor which is not a div, here is the outmost article

Javascript array declaration: new Array(), new Array(3), ['a', 'b', 'c'] create arrays that behave differently

Arrays in JS have two types of properties:

Regular elements and associative properties (which are nothing but objects)

When you define a = new Array(), you are defining an empty array. Note that there are no associative objects yet

When you define b = new Array(2), you are defining an array with two undefined locations.

In both your examples of 'a' and 'b', you are adding associative properties i.e. objects to these arrays.

console.log (a) or console.log(b) prints the array elements i.e. [] and [undefined, undefined] respectively. But since a1/a2 and b1/b2 are associative objects inside their arrays, they can be logged only by console.log(a.a1, a.a2) kind of syntax

INSERT INTO from two different server database

You can use CREATE SYNONYM to remote object.

Unit tests vs Functional tests

Unit tests tell a developer that the code is doing things right; functional tests tell a developer that the code is doing the right things.

You can read more at Unit Testing versus Functional Testing

A well explained real-life analogy of unit testing and functional testing can be described as follows,

Many times the development of a system is likened to the building of a house. While this analogy isn't quite correct, we can extend it for the purposes of understanding the difference between unit and functional tests.

Unit testing is analogous to a building inspector visiting a house's construction site. He is focused on the various internal systems of the house, the foundation, framing, electrical, plumbing, and so on. He ensures (tests) that the parts of the house will work correctly and safely, that is, meet the building code.

Functional tests in this scenario are analogous to the homeowner visiting this same construction site. He assumes that the internal systems will behave appropriately, that the building inspector is performing his task. The homeowner is focused on what it will be like to live in this house. He is concerned with how the house looks, are the various rooms a comfortable size, does the house fit the family's needs, are the windows in a good spot to catch the morning sun.

The homeowner is performing functional tests on the house. He has the user's perspective.

The building inspector is performing unit tests on the house. He has the builder's perspective.

As a summary,

Unit Tests are written from a programmers perspective. They are made to ensure that a particular method (or a unit) of a class performs a set of specific tasks.

Functional Tests are written from the user's perspective. They ensure that the system is functioning as users are expecting it to.

Promise.all().then() resolve?

Today NodeJS supports new async/await syntax. This is an easy syntax and makes the life much easier

async function process(promises) { // must be an async function
    let x = await Promise.all(promises);  // now x will be an array
    x = x.map( tmp => tmp * 10);              // proccessing the data.
}

const promises = [
   new Promise(resolve => setTimeout(resolve, 0, 1)),
   new Promise(resolve => setTimeout(resolve, 0, 2))
];

process(promises)

Learn more:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function

How to solve 'Redirect has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header'?

Hello If I understood it right you are doing an XMLHttpRequest to a different domain than your page is on. So the browser is blocking it as it usually allows a request in the same origin for security reasons. You need to do something different when you want to do a cross-domain request. A tutorial about how to achieve that is Using CORS.

When you are using postman they are not restricted by this policy. Quoted from Cross-Origin XMLHttpRequest:

Regular web pages can use the XMLHttpRequest object to send and receive data from remote servers, but they're limited by the same origin policy. Extensions aren't so limited. An extension can talk to remote servers outside of its origin, as long as it first requests cross-origin permissions.

Didn't Java once have a Pair class?

Many 3rd party libraries have their versions of Pair, but Java has never had such a class. The closest is the inner interface java.util.Map.Entry, which exposes an immutable key property and a possibly mutable value property.

Parsing jQuery AJAX response

Use parseJSON. Look at the doc

var obj = $.parseJSON(data);

Something like this:

$.ajax({     
    type: "POST",
    url: '/admin/systemgoalssystemgoalupdate?format=html',
    data: formdata,
    success: function (data) {

        console.log($.parseJSON(data)); //will log Object

    }
});

sh: 0: getcwd() failed: No such file or directory on cited drive

Please check the directory path whether exists or not. This error comes up if the folder doesn't exists from where you are running the command. Probably you have executed a remove command from same path in command line.

Why am I getting a "401 Unauthorized" error in Maven?

It could be caused by wrong version, you can double check the parent's version and lib's version, to make sure they're correct and not duplicated, I've experienced same problem

How to find GCD, LCM on a set of numbers

With Java 8, there are more elegant and functional ways to solve this.

LCM:

private static int lcm(int numberOne, int numberTwo) {
    final int bigger = Math.max(numberOne, numberTwo);
    final int smaller = Math.min(numberOne, numberTwo);

    return IntStream.rangeClosed(1,smaller)
                    .filter(factor -> (factor * bigger) % smaller == 0)
                    .map(factor -> Math.abs(factor * bigger))
                    .findFirst()
                    .getAsInt();
}

GCD:

private static int gcd(int numberOne, int numberTwo) {
    return (numberTwo == 0) ? numberOne : gcd(numberTwo, numberOne % numberTwo);
}

Of course if one argument is 0, both methods will not work.

How do I set the maximum line length in PyCharm?

For PyCharm 4

File >> Settings >> Editor >> Code Style: Right margin (columns)

suggestion: Take a look at other options in that tab, they're very helpful

jQuery how to bind onclick event to dynamically added HTML element

    function load_tpl(selected=""){
        $("#load_tpl").empty();
        for(x in ds_tpl){
            $("#load_tpl").append('<li><a id="'+ds_tpl[x]+'" href="#" >'+ds_tpl[x]+'</a></li>');
        }
        $.each($("#load_tpl a"),function(){
            $(this).on("click",function(e){
                alert(e.target.id);
            });
        });
    }

How to extract text from a string using sed?

sed doesn't recognize \d, use [[:digit:]] instead. You will also need to escape the + or use the -r switch (-E on OS X).

Note that [0-9] works as well for Arabic-Hindu numerals.

Open URL in new window with JavaScript

Just use window.open() function? The third parameter lets you specify window size.

Example

var strWindowFeatures = "location=yes,height=570,width=520,scrollbars=yes,status=yes";
var URL = "https://www.linkedin.com/cws/share?mini=true&amp;url=" + location.href;
var win = window.open(URL, "_blank", strWindowFeatures);

How to log SQL statements in Spring Boot?

For the MS-SQL server driver (Microsoft SQL Server JDBC Driver).

try using:

logging.level.com.microsoft.sqlserver.jdbc=debug

in your application.properties file.

My personal preference is to set:

logging.level.com.microsoft.sqlserver.jdbc=info
logging.level.com.microsoft.sqlserver.jdbc.internals=debug

You can look at these links for reference:

Get Value of Row in Datatable c#

for (int i=0; i<dt_pattern.Rows.Count; i++)
{
    DataRow dr = dt_pattern.Rows[i];
}

In the loop, you can now reference row i+1 (assuming there is an i+1)

CSS submit button weird rendering on iPad/iPhone

The above answer for webkit appearance worked, but the button still looked kind pale/dull compared to the browser on other devices/desktop. I also had to set opacity to full (ranges from 0 to 1)

-webkit-appearance:none;
opacity: 1

After setting the opacity, the button looked the same on all the different devices/emulator/desktop.

Templated check for the existence of a class member function?

You can skip all the metaprogramming in C++14, and just write this using fit::conditional from the Fit library:

template<class T>
std::string optionalToString(T* x)
{
    return fit::conditional(
        [](auto* obj) -> decltype(obj->toString()) { return obj->toString(); },
        [](auto*) { return "toString not defined"; }
    )(x);
}

You can also create the function directly from the lambdas as well:

FIT_STATIC_LAMBDA_FUNCTION(optionalToString) = fit::conditional(
    [](auto* obj) -> decltype(obj->toString(), std::string()) { return obj->toString(); },
    [](auto*) -> std::string { return "toString not defined"; }
);

However, if you are using a compiler that doesn't support generic lambdas, you will have to write separate function objects:

struct withToString
{
    template<class T>
    auto operator()(T* obj) const -> decltype(obj->toString(), std::string())
    {
        return obj->toString();
    }
};

struct withoutToString
{
    template<class T>
    std::string operator()(T*) const
    {
        return "toString not defined";
    }
};

FIT_STATIC_FUNCTION(optionalToString) = fit::conditional(
    withToString(),
    withoutToString()
);

How to enable PHP short tags?

In CentOS 6(tested on Centos 7 too) you can't set short_open_tag in /etc/php.ini for php-fpm. You will have error:

ERROR: [/etc/php.ini:159] unknown entry 'short_open_tag'
ERROR: Unable to include /etc/php.ini from /etc/php-fpm.conf at line 159
ERROR: failed to load configuration file '/etc/php-fpm.conf'
ERROR: FPM initialization failed

You must edit config for your site, which can found in /etc/php-fpm.d/www.conf And write at end of file:

php_value[short_open_tag] =  On

How to use WinForms progress bar?

Hey there's a useful tutorial on Dot Net pearls: http://www.dotnetperls.com/progressbar

In agreement with Peter, you need to use some amount of threading or the program will just hang, somewhat defeating the purpose.

Example that uses ProgressBar and BackgroundWorker: C#

using System.ComponentModel;
using System.Threading;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, System.EventArgs e)
        {
            // Start the BackgroundWorker.
            backgroundWorker1.RunWorkerAsync();
        }

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            for (int i = 1; i <= 100; i++)
            {
                // Wait 100 milliseconds.
                Thread.Sleep(100);
                // Report progress.
                backgroundWorker1.ReportProgress(i);
            }
        }

        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            // Change the value of the ProgressBar to the BackgroundWorker progress.
            progressBar1.Value = e.ProgressPercentage;
            // Set the text.
            this.Text = e.ProgressPercentage.ToString();
        }
    }
} //closing here

Does List<T> guarantee insertion order?

As Bevan said, but keep in mind, that the list-index is 0-based. If you want to move an element to the front of the list, you have to insert it at index 0 (not 1 as shown in your example).

How to print the contents of RDD?

You can also save as a file: rdd.saveAsTextFile("alicia.txt")

MVC razor form with multiple different submit buttons?

In case you're using pure razor, i.e. no MVC controller:

<button name="SubmitForm" value="Hello">Hello</button>
<button name="SubmitForm" value="World">World</button>
@if (IsPost)
{
    <p>@Request.Form["SubmitForm"]</p>
}

Clicking each of the buttons should render out Hello and World.

How can I produce an effect similar to the iOS 7 blur view?

Every response here is using vImageBoxConvolve_ARGB8888 this function is really, really slow, that is fine, if the performance is not a high priority requirement, but if you are using this for transitioning between two View Controllers (for example) this approach means times over 1 second or maybe more, that is very bad to the user experience of your application.

If you prefer leave all this image processing to the GPU (And you should) you can get a much better effect and also awesome times rounding 50ms (supposing that you have a time of 1 second in the first approach), so, lets do it.

First download the GPUImage Framework (BSD Licensed) here.

Next, Add the following classes (.m and .h) from the GPUImage (I'm not sure that these are the minimum needed for the blur effect only)

GPUImage.h
GPUImageAlphaBlendFilter
GPUImageFilter
GPUImageFilterGroup
GPUImageGaussianBlurPositionFilter
GPUImageGaussianSelectiveBlurFilter
GPUImageLuminanceRangeFilter
GPUImageOutput
GPUImageTwoInputFilter
GLProgram
GPUImageBoxBlurFilter
GPUImageGaussianBlurFilter
GPUImageiOSBlurFilter
GPUImageSaturationFilter
GPUImageSolidColorGenerator
GPUImageTwoPassFilter
GPUImageTwoPassTextureSamplingFilter
iOS/GPUImage-Prefix.pch
iOS/GPUImageContext
iOS/GPUImageMovieWriter
iOS/GPUImagePicture
iOS/GPUImageView

Next, create a category on UIImage, that will add a blur effect to an existing UIImage:

#import "UIImage+Utils.h"

#import "GPUImagePicture.h"
#import "GPUImageSolidColorGenerator.h"
#import "GPUImageAlphaBlendFilter.h"
#import "GPUImageBoxBlurFilter.h"

@implementation UIImage (Utils)

- (UIImage*) GPUBlurredImage
{
    GPUImagePicture *source =[[GPUImagePicture alloc] initWithImage:self];

    CGSize size = CGSizeMake(self.size.width * self.scale, self.size.height * self.scale);

    GPUImageBoxBlurFilter *blur = [[GPUImageBoxBlurFilter alloc] init];
    [blur setBlurRadiusInPixels:4.0f];
    [blur setBlurPasses:2.0f];
    [blur forceProcessingAtSize:size];
    [source addTarget:blur];

    GPUImageSolidColorGenerator * white = [[GPUImageSolidColorGenerator alloc] init];

    [white setColorRed:1.0f green:1.0f blue:1.0f alpha:0.1f];
    [white forceProcessingAtSize:size];

    GPUImageAlphaBlendFilter * blend = [[GPUImageAlphaBlendFilter alloc] init];
    blend.mix = 0.9f;

    [blur addTarget:blend];
    [white addTarget:blend];

    [blend forceProcessingAtSize:size];
    [source processImage];

    return [blend imageFromCurrentlyProcessedOutput];
}

@end

And last, add the following frameworks to your project:

AVFoundation CoreMedia CoreVideo OpenGLES

Yeah, got fun with this much faster approach ;)

How to set IntelliJ IDEA Project SDK

For IntelliJ IDEA 2017.2 I did the following to fix this issue: Go to your project structure Now go to SDKs under platform settings and click the green add button. Add your JDK path. In my case it was this path C:\Program Files\Java\jdk1.8.0_144 Now Just go Project under Project settings and select the project SDK.

How can I extract the folder path from file path in Python?

Here is the code:

import os
existGDBPath = r'T:\Data\DBDesign\DBDesign_93_v141b.mdb'
wkspFldr = os.path.dirname(existGDBPath)
print wkspFldr # T:\Data\DBDesign

Importing class from another file

Your problem is basically that you never specified the right path to the file.

Try instead, from your main script:

from folder.file import Klasa

Or, with from folder import file:

from folder import file
k = file.Klasa()

Or again:

import folder.file as myModule
k = myModule.Klasa()

Converting between java.time.LocalDateTime and java.util.Date

If you are on android and using threetenbp you can use DateTimeUtils instead.

ex:

Date date = DateTimeUtils.toDate(localDateTime.atZone(ZoneId.systemDefault()).toInstant());

you can't use Date.from since it's only supported on api 26+

Meaning of Choreographer messages in Logcat

In my case I have these messages when I show the sherlock action bar inderterminate progressbar. Since its not my library, I decided to hide the Choreographer outputs.

You can hide the Choreographer outputs onto the Logcat view, using this filter expression :

tag:^((?!Choreographer).*)$

I used a regex explained elsewhere : Regular expression to match a line that doesn't contain a word?

GDB: break if variable equal value

You can use a watchpoint for this (A breakpoint on data instead of code).

You can start by using watch i.
Then set a condition for it using condition <breakpoint num> i == 5

You can get the breakpoint number by using info watch

Setting a timeout for socket operations

You could use the following solution:

SocketAddress sockaddr = new InetSocketAddress(ip, port);
// Create your socket
Socket socket = new Socket();
// Connect with 10 s timeout
socket.connect(sockaddr, 10000);

Hope it helps!

Reduce left and right margins in matplotlib plot

With recent matplotlib versions you might want to try Constrained Layout.

Too bad pandas does not handle it well...

Wait for a void async method

I know this is an old question, but this is still a problem I keep walking into, and yet there is still no clear solution to do this correctly when using async/await in an async void signature method.

However, I noticed that .Wait() is working properly inside the void method.

and since async void and void have the same signature, you might need to do the following.

void LoadBlahBlah()
{
    blah().Wait(); //this blocks
}

Confusingly enough async/await does not block on the next code.

async void LoadBlahBlah()
{
    await blah(); //this does not block
}

When you decompile your code, my guess is that async void creates an internal Task (just like async Task), but since the signature does not support to return that internal Tasks

this means that internally the async void method will still be able to "await" internally async methods. but externally unable to know when the internal Task is complete.

So my conclusion is that async void is working as intended, and if you need feedback from the internal Task, then you need to use the async Task signature instead.

hopefully my rambling makes sense to anybody also looking for answers.

Edit: I made some example code and decompiled it to see what is actually going on.

static async void Test()
{
    await Task.Delay(5000);
}

static async Task TestAsync()
{
    await Task.Delay(5000);
}

Turns into (edit: I know that the body code is not here but in the statemachines, but the statemachines was basically identical, so I didn't bother adding them)

private static void Test()
{
    <Test>d__1 stateMachine = new <Test>d__1();
    stateMachine.<>t__builder = AsyncVoidMethodBuilder.Create();
    stateMachine.<>1__state = -1;
    AsyncVoidMethodBuilder <>t__builder = stateMachine.<>t__builder;
    <>t__builder.Start(ref stateMachine);
}
private static Task TestAsync()
{
    <TestAsync>d__2 stateMachine = new <TestAsync>d__2();
    stateMachine.<>t__builder = AsyncTaskMethodBuilder.Create();
    stateMachine.<>1__state = -1;
    AsyncTaskMethodBuilder <>t__builder = stateMachine.<>t__builder;
    <>t__builder.Start(ref stateMachine);
    return stateMachine.<>t__builder.Task;
}

neither AsyncVoidMethodBuilder or AsyncTaskMethodBuilder actually have any code in the Start method that would hint of them to block, and would always run asynchronously after they are started.

meaning without the returning Task, there would be no way to check if it is complete.

as expected, it only starts the Task running async, and then it continues in the code. and the async Task, first it starts the Task, and then it returns it.

so I guess my answer would be to never use async void, if you need to know when the task is done, that is what async Task is for.

Run class in Jar file

Assuming you are in the directory where myJar.jar file is and that myClass has a public static void main() method on it:

You use the following command line:

java -cp ./myJar.jar myClass

Where:

myJar.jar is in the current path, note that . isn't in the current path on most systems. A fully qualified path is preferred here as well.
myClass is a fully qualified package path to the class, the example assumes that myClass is in the default package which is bad practice, if it is in a nested package it would be com.mycompany.mycode.myClass.

How to put an image in div with CSS?

This answer by Jaap :

<div class="image"></div>?

and in CSS :

div.image {
   content:url(http://placehold.it/350x150);
}?

you can try it on this link : http://jsfiddle.net/XAh2d/

this is a link about css content http://css-tricks.com/css-content/

This has been tested on Chrome, firefox and Safari. (I'm on a mac, so if someone has the result on IE, tell me to add it)

How to create a sub array from another array in Java?

Arrays.copyOfRange(..) was added in Java 1.6. So perhaps you don't have the latest version. If it's not possible to upgrade, look at System.arraycopy(..)

Writing handler for UIAlertAction

Lets assume that you want an UIAlertAction with main title, two actions (save and discard) and cancel button:

let actionSheetController = UIAlertController (title: "My Action Title", message: "", preferredStyle: UIAlertControllerStyle.ActionSheet)

    //Add Cancel-Action
    actionSheetController.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: nil))

    //Add Save-Action
    actionSheetController.addAction(UIAlertAction(title: "Save", style: UIAlertActionStyle.Default, handler: { (actionSheetController) -> Void in
        print("handle Save action...")
    }))

    //Add Discard-Action
    actionSheetController.addAction(UIAlertAction(title: "Discard", style: UIAlertActionStyle.Default, handler: { (actionSheetController) -> Void in
        print("handle Discard action ...")
    }))

    //present actionSheetController
    presentViewController(actionSheetController, animated: true, completion: nil)

This works for swift 2 (Xcode Version 7.0 beta 3)

Can I get div's background-image url?

I have slightly improved answer, which handles extended CSS definitions like:

background-image: url(http://d36xtkk24g8jdx.cloudfront.net/bluebar/359de8f/images/shared/noise-1.png), -webkit-linear-gradient(top, rgb(81, 127, 164), rgb(48, 96, 136))

JavaScript code:

var bg = $("div").css("background-image")
bg = bg.replace(/.*\s?url\([\'\"]?/, '').replace(/[\'\"]?\).*/, '')

Result:

"http://d36xtkk24g8jdx.cloudfront.net/bluebar/359de8f/images/shared/noise-1.png"

What is 'Currying'?

Here's a concrete example:

Suppose you have a function that calculates the gravitational force acting on an object. If you don't know the formula, you can find it here. This function takes in the three necessary parameters as arguments.

Now, being on the earth, you only want to calculate forces for objects on this planet. In a functional language, you could pass in the mass of the earth to the function and then partially evaluate it. What you'd get back is another function that takes only two arguments and calculates the gravitational force of objects on earth. This is called currying.

IntelliJ does not show 'Class' when we right click and select 'New'

If you open your module settings (F4) you can nominate which paths contain 'source'. Intellij will then mark these directories in blue and allow you to add classes etc.

In a similar fashion you can highlight test directories for unit tests.

Largest and smallest number in an array

   static void PrintSmallestLargest(int[] arr)
    {
        if (arr.Length > 0)
        {
            int small = arr[0];
            int large = arr[0];
            for (int i = 0; i < arr.Length; i++)
            {
                if (large < arr[i])
                {
                    int tmp = large;
                    large = arr[i];
                    arr[i] = large;
                }
                if (small > arr[i])
                {
                    int tmp = small;
                    small = arr[i];
                    arr[i] = small;
                }
            }
            Console.WriteLine("Smallest is {0}", small);
            Console.WriteLine("Largest is {0}", large);
        }
    }

This way you can have smallest and largest number in a single loop.

Send auto email programmatically

Referred link has correct answer, but there are written some libraries to make your work easy.

So don't write all code again, just use any of these library and get your work done in little time.

How do I create and read a value from cookie?

I have written simple cookieUtils, it has three functions for creating the cookie, reading the cookie and deleting the cookie.

var CookieUtils = {
    createCookie: function (name, value, expireTime) {
        expireTime = !!expireTime ? expireTime : (15 * 60 * 1000); // Default 15 min
        var date = new Date();
        date.setTime(date.getTime() + expireTime);
        var expires = "; expires=" + date.toGMTString();
        document.cookie = name + "=" + value + expires + "; path=/";
    },
    getCookie: function (name) {
        var value = "; " + document.cookie;
        var parts = value.split("; " + name + "=");
        if (parts.length == 2) {
            return parts.pop().split(";").shift();
        }
    },
    deleteCookie: function(name) {
        document.cookie = name +'=; Path=/; Expires=Thu, 01 Jan 1970 00:00:01 GMT;';
    }
};

static const vs #define

If you are defining a constant to be shared among all the instances of the class, use static const. If the constant is specific to each instance, just use const (but note that all constructors of the class must initialize this const member variable in the initialization list).

Get second child using jQuery

_{It's surprising to see that nobody mentioned the native JS way to do this..}

Without jQuery:

Just access the children property of the parent element. It will return a live HTMLCollection of children elements which can be accessed by an index. If you want to get the second child:

parentElement.children[1];

In your case, something like this could work: (example)

var secondChild = document.querySelector('.parent').children[1];

console.log(secondChild); // <td>element two</td>

<table>
    <tr class="parent">
        <td>element one</td>
        <td>element two</td>
    </tr>
</table>

You can also use a combination of CSS3 selectors / querySelector() and utilize :nth-of-type(). This method may work better in some cases, because you can also specifiy the element type, in this case td:nth-of-type(2) (example)

var secondChild = document.querySelector('.parent > td:nth-of-type(2)');

console.log(secondChild); // <td>element two</td>

change Oracle user account status from EXPIRE(GRACE) to OPEN

set long 9999999
set lin 400
select DBMS_METADATA.GET_DDL('USER','YOUR_USER_NAME') from dual;

This will output something like this:

SQL> select DBMS_METADATA.GET_DDL('USER','WILIAM') from dual;

DBMS_METADATA.GET_DDL('USER','WILIAM')
--------------------------------------------------------------------------------

   CREATE USER "WILIAM" IDENTIFIED BY VALUES 'S:6680C1468F5F3B36B726CE7620F
FD9657F0E0E49AE56AAACE847BA368CEB;120F24A4C2554B4F'
      DEFAULT TABLESPACE "USER"
      TEMPORARY TABLESPACE "TEMP"
      PASSWORD EXPIRE

Just use the first piece of that with alter user instead:

ALTER USER "WILIAM" IDENTIFIED BY VALUES 'S:6680C1468F5F3B36B726CE7620F
FD9657F0E0E49AE56AAACE847BA368CEB;120F24A4C2554B4F';

This will put the account back in to OPEN status without changing the password (as long as you cut and paste correctly the hash value from the output of DBMS_METADATA.GET_DDL) and you don't even need to know what the password is.

Angular 6 Material mat-select change method removed

For me (selectionChange) and the suggested (onSelectionChange) didn't work and I'm not using ReactiveForms. What I ended up doing was using the (valueChange) event like:

<mat-select (valueChange)="someFunction()">

And this worked for me

How to go back to previous page if back button is pressed in WebView?

You can try this for webview in a fragment:

private lateinit var webView: WebView

override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    val root = inflater.inflate(R.layout.fragment_name, container, false)
    webView = root!!.findViewById(R.id.home_web_view)
    var url: String = "http://yoururl.com"
    webView.settings.javaScriptEnabled = true
    webView.webViewClient = WebViewClient()
    webView.loadUrl(url)
    webView.canGoBack()
    webView.setOnKeyListener{ v, keyCode, event ->
        if(keyCode == KeyEvent.KEYCODE_BACK && event.action == MotionEvent.ACTION_UP
            && webView.canGoBack()){
            webView.goBack()
            return@setOnKeyListener true
        }
        false
    }
    return root
}

Passing arguments to angularjs filters

Extending on pkozlowski.opensource's answer and using javascript array's builtin filter method a prettified solution could be this:

.filter('weDontLike', function(){
    return function(items, name){
        return items.filter(function(item) {
            return item.name != name;
        });
    };
});

Here's the jsfiddle link.

calculating number of days between 2 columns of dates in data frame

Following Ronald Example I would like to add that it should be considered if the origin and end dates must be included or not in the days count between two dates. I faced the same problem and ended up using a third option with apply. It could be memory inefficient but helps to understand the problem:

   survey <- data.frame(date=c("2012/07/26","2012/07/25"),tx_start=c("2012/01/01","2012/01/01"))

survey$diff_1 <- as.numeric(
  as.Date(as.character(survey$date), format="%Y/%m/%d")-
    as.Date(as.character(survey$tx_start), format="%Y/%m/%d")
)

survey$diff_2<- as.numeric(
  difftime(survey$date ,survey$tx_start , units = c("days"))
)

survey$diff_3 <- apply(X = survey[,c("date", "tx_start")],
                       MARGIN = 1,
                       FUN = function(x)
                         length(
                           seq.Date(
                             from = as.Date(x[2]),
                             to = as.Date(x[1]),
                             by = "day")
                           )
                       )

This gives the following date differences:

        date   tx_start diff_1   diff_2 diff_3
1 2012/07/26 2012/01/01    207 206.9583    208
2 2012/07/25 2012/01/01    206 205.9583    207

How do I split a string in Rust?

There's also split_whitespace()

fn main() {
    let words: Vec<&str> = "   foo   bar\t\nbaz   ".split_whitespace().collect();
    println!("{:?}", words);
    // ["foo", "bar", "baz"] 
}

Scala how can I count the number of occurrences in a list

list.groupBy(i=>i).mapValues(_.size)

gives

Map[Int, Int] = Map(1 -> 1, 2 -> 3, 7 -> 1, 3 -> 1, 4 -> 3)

Note that you can replace (i=>i) with built in identity function:

list.groupBy(identity).mapValues(_.size)

How to get screen dimensions as pixels in Android

DisplayMetrics dm = getResources().getDisplayMetrics();
float fwidth = dm.density * dm.widthPixels;
float fheight = dm.density * dm.heightPixels;

If getSize gets you an error due to your minSDKVersion and you don't want to use deprecated methods (getWidth & getHeight), the getMetrics solution was originally posted on 2011 by Balaji.K... And Nik added a comment explaining getDisplayMetrics also considers the status bar size.

Some other comments refer to multiply by the scale (density) in order to get the precise float value of the dimensions. Tested in Android v2.2 (API 8) and v4.0 with good results and no errors/warnings.

Center a column using Twitter Bootstrap 3

With Bootstrap v4, this can be accomplished just by adding .justify-content-center to the .row <div>

<div class="row justify-content-center">
    <div class="col-1">centered 1 column</div>
</div>

https://getbootstrap.com/docs/4.0/utilities/flex/#justify-content

What is Dependency Injection?

Dependency injection is one possible solution to what could generally be termed the "Dependency Obfuscation" requirement. Dependency Obfuscation is a method of taking the 'obvious' nature out of the process of providing a dependency to a class that requires it and therefore obfuscating, in some way, the provision of said dependency to said class. This is not necessarily a bad thing. In fact, by obfuscating the manner by which a dependency is provided to a class then something outside the class is responsible for creating the dependency which means, in various scenarios, a different implementation of the dependency can be supplied to the class without making any changes to the class. This is great for switching between production and testing modes (eg., using a 'mock' service dependency).

Unfortunately the bad part is that some people have assumed you need a specialized framework to do dependency obfuscation and that you are somehow a 'lesser' programmer if you choose not to use a particular framework to do it. Another, extremely disturbing myth, believed by many, is that dependency injection is the only way of achieving dependency obfuscation. This is demonstrably and historically and obviously 100% wrong but you will have trouble convincing some people that there are alternatives to dependency injection for your dependency obfuscation requirements.

Programmers have understood the dependency obfuscation requirement for years and many alternative solutions have evolved both before and after dependency injection was conceived. There are Factory patterns but there are also many options using ThreadLocal where no injection to a particular instance is needed - the dependency is effectively injected into the thread which has the benefit of making the object available (via convenience static getter methods) to any class that requires it without having to add annotations to the classes that require it and set up intricate XML 'glue' to make it happen. When your dependencies are required for persistence (JPA/JDO or whatever) it allows you to achieve 'tranaparent persistence' much easier and with domain model and business model classes made up purely of POJOs (i.e. no framework specific/locked in annotations).

How do I use disk caching in Picasso?

I use this code and worked, maybe useful for you:

public static void makeImageRequest(final View parentView,final int id, final String imageUrl) {

    final int defaultImageResId = R.mipmap.user;
    final ImageView imageView = (ImageView) parentView.findViewById(id);
    Picasso.with(context)
            .load(imageUrl)
            .networkPolicy(NetworkPolicy.OFFLINE)
            .into(imageView, new Callback() {
                @Override
                public void onSuccess() {
                Log.v("Picasso","fetch image success in first time.");
                }

                @Override
                public void onError() {
                    //Try again online if cache failed
                    Log.v("Picasso","Could not fetch image in first time...");
                    Picasso.with(context).load(imageUrl).networkPolicy(NetworkPolicy.NO_CACHE)
                            .memoryPolicy(MemoryPolicy.NO_CACHE, MemoryPolicy.NO_STORE).error(defaultImageResId)
                            .into(imageView, new Callback() {

                                @Override
                                public void onSuccess() {
                                    Log.v("Picasso","fetch image success in try again.");
                                }

                                @Override
                                public void onError() {
                                  Log.v("Picasso","Could not fetch image again...");
                                }

                            });
                }
            });

}

Apply style ONLY on IE

Update 2017

Depending on the environment, conditional comments have been officially deprecated and removed in IE10+.

Original

The simplest way is probably to use an Internet Explorer conditional comment in your HTML:

<!--[if IE]>
<style>
    .actual-form table {
         width: 100%;
    }
</style>
<![endif]-->

There are numerous hacks (e.g. the underscore hack) you can use that will allow you to target only IE within your stylesheet, but it gets very messy if you want to target all versions of IE on all platforms.

How do I force Sublime Text to indent two spaces per tab?

Redirect within component Angular 2

This worked for me Angular cli 6.x:

import {Router} from '@angular/router';

constructor(private artistService: ArtistService, private router: Router) { }

  selectRow(id: number): void{
       this.router.navigate([`./artist-detail/${id}`]);

  }

Add bottom line to view in SwiftUI / Swift / Objective-C / Xamarin

 extension UITextField {  
  func setBottomBorder(color:String) {
    self.borderStyle = UITextBorderStyle.None
    let border = CALayer()
    let width = CGFloat(1.0)
    border.borderColor = UIColor(hexString: color)!.cgColor
    border.frame = CGRect(x: 0, y: self.frame.size.height - width,   width:  self.frame.size.width, height: self.frame.size.height)
    border.borderWidth = width
    self.layer.addSublayer(border)
    self.layer.masksToBounds = true
   }
}

and then just do this:

yourTextField.setBottomBorder(color: "#3EFE46")

DateTime.ToString() format that can be used in a filename or extension?

You can try with

var result = DateTime.Now.ToString("yyyy-MM-d--HH-mm-ss");

Why does PEP-8 specify a maximum line length of 79 characters?

I agree with Justin. To elaborate, overly long lines of code are harder to read by humans and some people might have console widths that only accommodate 80 characters per line.

The style recommendation is there to ensure that the code you write can be read by as many people as possible on as many platforms as possible and as comfortably as possible.

Using (Ana)conda within PyCharm

Continuum Analytics now provides instructions on how to setup Anaconda with various IDEs including Pycharm here. However, with Pycharm 5.0.1 running on Unbuntu 15.10 Project Interpreter settings were found via the File | Settings and then under the Project branch of the treeview on the Settings dialog.

matplotlib get ylim values

Leveraging from the good answers above and assuming you were only using plt as in

import matplotlib.pyplot as plt

then you can get all four plot limits using plt.axis() as in the following example.

import matplotlib.pyplot as plt

x = [1, 2, 3, 4, 5, 6, 7, 8]  # fake data
y = [1, 2, 3, 4, 3, 2, 5, 6]

plt.plot(x, y, 'k')

xmin, xmax, ymin, ymax = plt.axis()

s = 'xmin = ' + str(round(xmin, 2)) + ', ' + \
    'xmax = ' + str(xmax) + '\n' + \
    'ymin = ' + str(ymin) + ', ' + \
    'ymax = ' + str(ymax) + ' '

plt.annotate(s, (1, 5))

plt.show()

The above code should produce the following output plot.

Specifying maxlength for multiline textbox

Have a look at this. The only way to solve it is by javascript as you tried.

EDIT: Try changing the event to keypressup.

How to debug Lock wait timeout exceeded on MySQL?

Extrapolating from Rolando's answer above, it is these that are blocking your query:

---TRANSACTION 0 620783788, not started, process no 29956, OS thread id 1196472640
MySQL thread id 5341773, query id 189708353 10.64.89.143 viget

If you need to execute your query and can not wait for the others to run, kill them off using the MySQL thread id:

kill 5341773 <replace with your thread id>

^{(from within mysql, not the shell, obviously)}

You have to find the thread IDs from the:

show engine innodb status\G

command, and figure out which one is the one that is blocking the database.

Setting DIV width and height in JavaScript

Fix the typos in your code ("document" is spelled wrong on lines 3 & 4 of your function, and change the onclick event handler to read: onclick="show_update_profile()" and then you'll be fine. You should really follow jmort's advice and simply set up 2 css classes that you switch between in javascript -- it would make your life a lot easier and save yourself from all the extra typing. The typos you've committed are a perfect example of why this is the better approach.

For brownie points, you should also check out element.addEventListener for assigning event handlers to your elements.

Https Connection Android

I make this class and found

package com.example.fakessl;

import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;

import android.util.Log;

public class CertificadoAceptar {
    private static TrustManager[] trustManagers;

    public static class _FakeX509TrustManager implements
            javax.net.ssl.X509TrustManager {
        private static final X509Certificate[] _AcceptedIssuers = new X509Certificate[] {};

        public void checkClientTrusted(X509Certificate[] arg0, String arg1)
                throws CertificateException {
        }

        public void checkServerTrusted(X509Certificate[] arg0, String arg1)
                throws CertificateException {
        }

        public boolean isClientTrusted(X509Certificate[] chain) {
            return (true);
        }

        public boolean isServerTrusted(X509Certificate[] chain) {
            return (true);
        }

        public X509Certificate[] getAcceptedIssuers() {
            return (_AcceptedIssuers);
        }
    }

    public static void allowAllSSL() {

        javax.net.ssl.HttpsURLConnection
                .setDefaultHostnameVerifier(new HostnameVerifier() {
                    public boolean verify(String hostname, SSLSession session) {
                        return true;
                    }
                });

        javax.net.ssl.SSLContext context = null;

        if (trustManagers == null) {
            trustManagers = new javax.net.ssl.TrustManager[] { new _FakeX509TrustManager() };
        }

        try {
            context = javax.net.ssl.SSLContext.getInstance("TLS");
            context.init(null, trustManagers, new SecureRandom());
        } catch (NoSuchAlgorithmException e) {
            Log.e("allowAllSSL", e.toString());
        } catch (KeyManagementException e) {
            Log.e("allowAllSSL", e.toString());
        }
        javax.net.ssl.HttpsURLConnection.setDefaultSSLSocketFactory(context
                .getSocketFactory());
    }
}

in you code white this

CertificadoAceptar ca = new CertificadoAceptar();
ca.allowAllSSL();
HttpsTransportSE Transport = new HttpsTransportSE("iphost or host name", 8080, "/WS/wsexample.asmx?WSDL", 30000);

How to convert an iterator to a stream?

This is possible in Java 9.

Stream.generate(() -> null)
    .takeWhile(x -> iterator.hasNext())
    .map(n -> iterator.next())
    .forEach(System.out::println);

check if a file is open in Python

if myfile.closed == False:
   print("File is still open ################")

How to use <sec:authorize access="hasRole('ROLES)"> for checking multiple Roles?

i used hasAnyRole('ROLE_ADMIN','ROLE_USER') but i was getting bean creation below error

Error creating bean with name     'org.springframework.security.web.access.intercept.FilterSecurityInterceptor#0': Cannot create inner bean '(inner bean)' of type [org.springframework.security.web.access.expression.ExpressionBasedFilterInvocationSecurityMetadataSource] while setting bean property 'securityMetadataSource'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#2': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.security.web.access.expression.ExpressionBasedFilterInvocationSecurityMetadataSource]: Constructor threw exception; nested exception is java.lang.IllegalArgumentException: Expected a single expression attribute for [/user/*]

then i tried

access="hasRole('ROLE_ADMIN') or hasRole('ROLE_USER')" and it's working fine for me.

as one of my user is admin as well as user.

for this you need to add use-expressions="true" auto-config="true" followed by http tag

<http use-expressions="true" auto-config="true" >.....</http>

Bootstrap Modal immediately disappearing

I was facing the same problem during testing on mobile devices and this trick worked for me

<a type="submit" class="btn btn-primary" data-toggle="modal" href="#myModal">Submit</a>

Change the button to anchor tag it should work, the problem occurs due to its type button as it is trying to submit so the modal disappears immediately.and also remove hide from modal hide fade give <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true"> Hope this would work for you .

Bootstrap: Position of dropdown menu relative to navbar item

If you want to display the menu up, just add the class "dropup"
and remove the class "dropdown" if exists from the same div.

<div class="btn-group dropup">

Declare a variable as Decimal

To declare a variable as a Decimal, first declare it as a Variant and then convert to Decimal with CDec. The type would be Variant/Decimal in the watch window:

Considering that programming floating point arithmetic is not what one has studied during Maths classes at school, one should always try to avoid common pitfalls by converting to decimal whenever possible.

In the example below, we see that the expression:

0.1 + 0.11 = 0.21

is either True or False, depending on whether the collectibles (0.1,0.11) are declared as Double or as Decimal:

Public Sub TestMe()

    Dim preciseA As Variant: preciseA = CDec(0.1)
    Dim preciseB As Variant: preciseB = CDec(0.11)

    Dim notPreciseA As Double: notPreciseA = 0.1
    Dim notPreciseB As Double: notPreciseB = 0.11

    Debug.Print preciseA + preciseB
    Debug.Print preciseA + preciseB = 0.21 'True

    Debug.Print notPreciseA + notPreciseB
    Debug.Print notPreciseA + notPreciseB = 0.21 'False

End Sub

Loop through JSON in EJS

in my case, datas is an objects of Array for more information please Click Here

<% for(let [index,data] of datas.entries() || []){  %>
 Index : <%=index%>
 Data : <%=data%>
<%} %>

java.lang.IllegalStateException: Only fullscreen opaque activities can request orientation

Google throws this exception on Activity's onCreate method after v27, their meaning is : if an Activity is translucent or floating, its orientation should be relied on parent(background) Activity, can't make decision on itself.

Even if you remove android:screenOrientation="portrait" from the floating or translucent Activity but fix orientation on its parent(background) Activity, it is still fixed by the parent, I have tested already.

One special situation : if you make translucent on a launcher Activity, it has't parent(background), so always rotate with device. Want to fix it, you have to take another way to replace <item name="android:windowIsTranslucent">true</item> style.

Format date and Subtract days using Moment.js

startdate = moment().subtract(1, 'days').startOf('day')

use localStorage across subdomains

If you're using the iframe and postMessage solution just for this particular problem, I think it might be less work (both code-wise and computation-wise) to just store the data in a subdomain-less cookie and, if it's not already in localStorage on load, grab it from the cookie.

Pros:

Doesn't need the extra iframe and postMessage set up.

Cons:

Will make the data available across all subdomains (not just www) so if you don't trust all the subdomains it may not work for you.
Will send the data to the server on each request. Not great, but depending on your scenario, maybe still less work than the iframe/postMessage solution.
If you're doing this, why not just use the cookies directly? Depends on your context.
4K max cookie size, total across all cookies for the domain (Thanks to Blake for pointing this out in comments)

I agree with other commenters though, this seems like it should be a specifiable option for localStorage so work-arounds aren't required.

What is HTTP "Host" header?

The Host Header tells the webserver which virtual host to use (if set up). You can even have the same virtual host using several aliases (= domains and wildcard-domains). In this case, you still have the possibility to read that header manually in your web app if you want to provide different behavior based on different domains addressed. This is possible because in your webserver you can (and if I'm not mistaken you must) set up one vhost to be the default host. This default vhost is used whenever the host header does not match any of the configured virtual hosts.

That means: You get it right, although saying "multiple hosts" may be somewhat misleading: The host (the addressed machine) is the same, what really gets resolved to the IP address are different domain names (including subdomains) that are also referred to as hostnames (but not hosts!).

Although not part of the question, a fun fact: This specification led to problems with SSL in early days because the web server has to deliver the certificate that corresponds to the domain the client has addressed. However, in order to know what certificate to use, the webserver should have known the addressed hostname in advance. But because the client sends that information only over the encrypted channel (which means: after the certificate has already been sent), the server had to assume you browsed the default host. That meant one ssl-secured domain per IP address / port-combination.

This has been overcome with Server Name Indication; however, that again breaks some privacy, as the server name is now transferred in plain text again, so every man-in-the-middle would see which hostname you are trying to connect to.

Although the webserver would know the hostname from Server Name Indication, the Host header is not obsolete, because the Server Name Indication information is only used within the TLS handshake. With an unsecured connection, there is no Server Name Indication at all, so the Host header is still valid (and necessary).

Another fun fact: Most webservers (if not all) reject your HTTP request if it does not contain exactly one Host header, even if it could be omitted because there is only the default vhost configured. That means the minimum required information in an http-(get-)request is the first line containing METHOD RESOURCE and PROTOCOL VERSION and at least the Host header, like this:

GET /someresource.html HTTP/1.1
Host: www.example.com

In the MDN Documentation on the "Host" header they actually phrase it like this:

A Host header field must be sent in all HTTP/1.1 request messages. A 400 (Bad Request) status code will be sent to any HTTP/1.1 request message that lacks a Host header field or contains more than one.

As mentioned by Darrel Miller, the complete specs can be found in RFC7230.

Number of processors/cores in command line

If you want to do this so it works on linux and OS X, you can do:

CORES=$(grep -c ^processor /proc/cpuinfo 2>/dev/null || sysctl -n hw.ncpu)

How to change the Eclipse default workspace?

File > Switch workspace > add the workspace you like > Eclipse will restart using the workspace you wanted.

How to build a Debian/Ubuntu package from source?

you can use the special package "checkinstall" for all packages which are not even in debian/ubuntu yet.

You can use "uupdate" (apt-get install devscripts) to build a package from source with existing debian sources:

Example for libdrm2:

apt-get build-dep libdrm2
apt-get source libdrm2
cd libdrm-2.3.1
uupdate ~/Downloads/libdrm-2.4.1.tar.gz
cd ../libdrm-2.4.1
dpkg-buildpackage -us -uc -nc

Unable to resolve host "<insert URL here>" No address associated with hostname

Please, check if you have valid internet connection.

No WebApplicationContext found: no ContextLoaderListener registered?

And if you would like to use an existing context, rather than a new context which would be loaded from xml configuration by org.springframework.web.context.ContextLoaderListener, then see -> https://stackoverflow.com/a/40694787/3004747

How to bind a List to a ComboBox?

If you are using a ToolStripComboBox there is no DataSource exposed (.NET 4.0):

List<string> someList = new List<string>();
someList.Add("value");
someList.Add("value");
someList.Add("value");

toolStripComboBox1.Items.AddRange(someList.ToArray());

What does iterator->second mean?

I'm sure you know that a std::vector<X> stores a whole bunch of X objects, right? But if you have a std::map<X, Y>, what it actually stores is a whole bunch of std::pair<const X, Y>s. That's exactly what a map is - it pairs together the keys and the associated values.

When you iterate over a std::map, you're iterating over all of these std::pairs. When you dereference one of these iterators, you get a std::pair containing the key and its associated value.

std::map<std::string, int> m = /* fill it */;
auto it = m.begin();

Here, if you now do *it, you will get the the std::pair for the first element in the map.

Now the type std::pair gives you access to its elements through two members: first and second. So if you have a std::pair<X, Y> called p, p.first is an X object and p.second is a Y object.

So now you know that dereferencing a std::map iterator gives you a std::pair, you can then access its elements with first and second. For example, (*it).first will give you the key and (*it).second will give you the value. These are equivalent to it->first and it->second.

Ascii/Hex convert in bash

I use:

> echo Aa | tr -d '\n' | xxd -p
4161

> echo 414161 | tr -d '\n' | xxd -r -p
AAa

The tr -d '\n' will trim any possible newlines in your input

How can javascript upload a blob?

You actually don't have to use FormData to send a Blob to the server from JavaScript (and a File is also a Blob).

jQuery example:

var file = $('#fileInput').get(0).files.item(0); // instance of File
$.ajax({
  type: 'POST',
  url: 'upload.php',
  data: file,
  contentType: 'application/my-binary-type', // set accordingly
  processData: false
});

Vanilla JavaScript example:

var file = $('#fileInput').get(0).files.item(0); // instance of File
var xhr = new XMLHttpRequest();
xhr.open('POST', '/upload.php', true);
xhr.onload = function(e) { ... };
xhr.send(file);

Granted, if you are replacing a traditional HTML multipart form with an "AJAX" implementation (that is, your back-end consumes multipart form data), you want to use the FormData object as described in another answer.

Source: New Tricks in XMLHttpRequest2 | HTML5 Rocks

Laravel stylesheets and javascript don't load for non-base routes

If you're using Laravel 3 and your CSS/JS files inside public folder like this

public/css
public/js

then you can call them using in Blade templates like this

{{ HTML::style('css/style.css'); }}
{{ HTML::script('js/jquery-1.8.2.min.js'); }}

R object identification

str(x)

It's all you need to remember for 99% of cases.

How do I clone into a non-empty directory?

this is work for me ,but you should merge remote repository files to the local files:

git init
git remote add origin url-to-git
git branch --set-upstream-to=origin/master master
git fetch
git status

How to get a specific column value from a DataTable in c#

The table normally contains multiple rows. Use a loop and use row.Field<string>(0) to access the value of each row.

foreach(DataRow row in dt.Rows)
{
    string file = row.Field<string>("File");
}

You can also access it via index:

foreach(DataRow row in dt.Rows)
{
    string file = row.Field<string>(0);
}

If you expect only one row, you can also use the indexer of DataRowCollection:

string file = dt.Rows[0].Field<string>(0);

Since this fails if the table is empty, use dt.Rows.Count to check if there is a row:

if(dt.Rows.Count > 0)
    file = dt.Rows[0].Field<string>(0);

How do I analyze a .hprof file?

I personally prefer VisualVM. One of the features I like in VisualVM is heap dump comparison. When you are doing a heap dump analysis there are various ways to go about figuring out what caused the crash. One of the ways I have found useful is doing a comparison of healthy vs unhealthy heap dumps.

Following are the steps you can follow for it :

Getting a heap dump of OutOfMemoryError let's call it "oome.hprof". You can get this via JVM parameter HeapDumpOnOutOfMemoryError.
Restart the application let it run for a big (minutes/hours) depending on your application. Get another heap dump while the application is still running. Let's call it "healthy.hprof".
You can open both these dumps in VisualVM and do a heap dump comparison. You can do it on class or package level. This can often point you into the direction of the issue.

link : https://visualvm.github.io

reducing number of plot ticks

Alternatively, if you want to simply set the number of ticks while allowing matplotlib to position them (currently only with MaxNLocator), there is pyplot.locator_params,

pyplot.locator_params(nbins=4)

You can specify specific axis in this method as mentioned below, default is both:

# To specify the number of ticks on both or any single axes
pyplot.locator_params(axis='y', nbins=6)
pyplot.locator_params(axis='x', nbins=10)

jQuery If DIV Doesn't Have Class "x"

Use the "not" selector.

For example, instead of:

$(".thumbs").hover()

try:

$(".thumbs:not(.selected)").hover()

How using try catch for exception handling is best practice

My exception-handling strategy is:

To catch all unhandled exceptions by hooking to the Application.ThreadException event, then decide:
- For a UI application: to pop it to the user with an apology message (WinForms)
- For a Service or a Console application: log it to a file (service or console)

Then I always enclose every piece of code that is run externally in try/catch :

All events fired by the WinForms infrastructure (Load, Click, SelectedChanged...)
All events fired by third party components

Then I enclose in 'try/catch'

All the operations that I know might not work all the time (IO operations, calculations with a potential zero division...). In such a case, I throw a new ApplicationException("custom message", innerException) to keep track of what really happened

Additionally, I try my best to sort exceptions correctly. There are exceptions which:

need to be shown to the user immediately
require some extra processing to put things together when they happen to avoid cascading problems (ie: put .EndUpdate in the finally section during a TreeView fill)
the user does not care, but it is important to know what happened. So I always log them:
In the event log
or in a .log file on the disk

It is a good practice to design some static methods to handle exceptions in the application top level error handlers.

I also force myself to try to:

Remember ALL exceptions are bubbled up to the top level. It is not necessary to put exception handlers everywhere.
Reusable or deep called functions does not need to display or log exceptions : they are either bubbled up automatically or rethrown with some custom messages in my exception handlers.

So finally:

Bad:

// DON'T DO THIS; ITS BAD
try
{
    ...
}
catch 
{
   // only air...
}

Useless:

// DON'T DO THIS; IT'S USELESS
try
{
    ...
}
catch(Exception ex)
{
    throw ex;
}

Having a try finally without a catch is perfectly valid:

try
{
    listView1.BeginUpdate();

    // If an exception occurs in the following code, then the finally will be executed
    // and the exception will be thrown
    ...
}
finally
{
    // I WANT THIS CODE TO RUN EVENTUALLY REGARDLESS AN EXCEPTION OCCURRED OR NOT
    listView1.EndUpdate();
}

What I do at the top level:

// i.e When the user clicks on a button
try
{
    ...
}
catch(Exception ex)
{
    ex.Log(); // Log exception

    -- OR --
    
    ex.Log().Display(); // Log exception, then show it to the user with apologies...
}

What I do in some called functions:

// Calculation module
try
{
    ...
}
catch(Exception ex)
{
    // Add useful information to the exception
    throw new ApplicationException("Something wrong happened in the calculation module:", ex);
}

// IO module
try
{
    ...
}
catch(Exception ex)
{
    throw new ApplicationException(string.Format("I cannot write the file {0} to {1}", fileName, directoryName), ex);
}

There is a lot to do with exception handling (Custom Exceptions) but those rules that I try to keep in mind are enough for the simple applications I do.

Here is an example of extensions methods to handle caught exceptions a comfortable way. They are implemented in a way they can be chained together, and it is very easy to add your own caught exception processing.

// Usage:

try
{
    // boom
}
catch(Exception ex)
{
    // Only log exception
    ex.Log();

    -- OR --

    // Only display exception
    ex.Display();

    -- OR --

    // Log, then display exception
    ex.Log().Display();

    -- OR --

    // Add some user-friendly message to an exception
    new ApplicationException("Unable to calculate !", ex).Log().Display();
}

// Extension methods

internal static Exception Log(this Exception ex)
{
    File.AppendAllText("CaughtExceptions" + DateTime.Now.ToString("yyyy-MM-dd") + ".log", DateTime.Now.ToString("HH:mm:ss") + ": " + ex.Message + "\n" + ex.ToString() + "\n");
    return ex;
}

internal static Exception Display(this Exception ex, string msg = null, MessageBoxImage img = MessageBoxImage.Error)
{
    MessageBox.Show(msg ?? ex.Message, "", MessageBoxButton.OK, img);
    return ex;
}

Android button with icon and text

Try this one.

<Button
    android:id="@+id/bSearch"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:padding="16dp"
    android:text="Search"
    android:drawableLeft="@android:drawable/ic_menu_search"
    android:textSize="24sp"/>

How to implement class constructor in Visual Basic?

Not sure what you mean with "class constructor" but I'd assume you mean one of the ones below.

Instance constructor:

Public Sub New()

End Sub

Shared constructor:

Shared Sub New()

End Sub

How to increase size of DOSBox window?

Looking again at your question, I think I see what's wrong with your conf file. You set:

fullresolution=1366x768 windowresolution=1366x768

That's why you're getting the letterboxing (black on either side). You've essentially told Dosbox that your screen is the same size as your window, but your screen is actually bigger, 1600x900 (or higher) per the Googled specs for that computer. So the 'difference' shows up in black. So you either should change fullresolution to your actual screen resolution, or revert to fullresolution=original default, and only specify the window resolution.

So now I wonder if you really want fullscreen, though your question asks about only a window. For you are getting a window, but you sized it short of your screen, hence the two black stripes (letterboxing). If you really want fullscreen, then you need to specify the actual resolution of your screen. 1366x768 is not big enough.

The next issue is, what's the resolution of the program itself? It won't go past its own resolution. So if the program/game is (natively) say 1280x720 (HD), then your window resolution setting shouldn't be bigger than that (remember, it's fixed not dynamic when you use AxB as windowresolution).

Example: DOS Lotus 123 will only extend eight columns and 20 rows. The bigger the Dosbox, the bigger the text, but not more columns and rows. So setting a higher windowresolution for that, only results in bigger text, not more columns and rows. After that you'll have letterboxing.

Hope this helps you better.

How to check if array element exists or not in javascript?

When trying to find out if an array index exists in JS, the easiest and shortest way to do it is through double negation.

let a = [];
a[1] = 'foo';
console.log(!!a[0])   // false
console.log(!!a[1])   // true

How to make Toolbar transparent?

Add the following line in style.xml

<style name="Base.Theme.AppTheme" parent="Theme.AppCompat.DayNight.NoActionBar">
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>

<style name="AppTheme" parent="Base.Theme.AppTheme">
</style>

Now add the following line in style-v21,

  <style name="AppTheme" parent="Base.Theme.AppTheme">
    <item name="android:windowDrawsSystemBarBackgrounds">true</item>
    <item name="android:statusBarColor">@android:color/transparent</item>
</style>

and set the theme as android:theme="@style/AppTheme"

It will make the status bar transparent.

ng if with angular for string contains

Only the shortcut syntax worked for me *ngIf.

(I think it's the later versions that use this syntax if I'm not mistaken)

<div *ngIf="haystack.indexOf('needle') > -1">
</div>

<div *ngIf="haystack.includes('needle')">
</div>

C# Syntax - Example of a Lambda Expression - ForEach() over Generic List

You can traverse each string in the list and even you can search in the whole generic using a single statement this makes searching easier.

public static void main(string[] args)
{
List names = new List();

names.Add(“Saurabh”);
names.Add("Garima");
names.Add(“Vivek”);
names.Add(“Sandeep”);

string stringResult = names.Find( name => name.Equals(“Garima”));
}

Send FormData with other field in AngularJS

This never gonna work, you can't stringify your FormData object.

You should do this:

this.uploadFileToUrl = function(file, title, text, uploadUrl){
   var fd = new FormData();
   fd.append('title', title);
   fd.append('text', text);
   fd.append('file', file);

     $http.post(uploadUrl, obj, {
       transformRequest: angular.identity,
       headers: {'Content-Type': undefined}
     })
  .success(function(){
    blockUI.stop();
  })
  .error(function(error){
    toaster.pop('error', 'Errore', error);
  });
}

MySQL Data Source not appearing in Visual Studio

Uninstall later version and install mysql-connector 6.3.9 for visual studio 2010.

After installing add the dll files and restart the visual studio.

It works fine.

Force download a pdf link using javascript/ajax/jquery

Using Javascript you can download like this in a simple method

var oReq = new XMLHttpRequest();
// The Endpoint of your server 
var URLToPDF = "https://mozilla.github.io/pdf.js/web/compressed.tracemonkey-pldi-09.pdf";
// Configure XMLHttpRequest
oReq.open("GET", URLToPDF, true);

// Important to use the blob response type
oReq.responseType = "blob";

// When the file request finishes
// Is up to you, the configuration for error events etc.
oReq.onload = function() {
// Once the file is downloaded, open a new window with the PDF
// Remember to allow the POP-UPS in your browser
var file = new Blob([oReq.response], { 
    type: 'application/pdf' 
});

// Generate file download directly in the browser !
saveAs(file, "mypdffilename.pdf");
};

oReq.send();

Get User's Current Location / Coordinates

Usage:

Define field in class

let getLocation = GetLocation()

Use in function of class by simple code:

getLocation.run {
    if let location = $0 {
        print("location = \(location.coordinate.latitude) \(location.coordinate.longitude)")
    } else {
        print("Get Location failed \(getLocation.didFailWithError)")
    }
}

Class:

import CoreLocation

public class GetLocation: NSObject, CLLocationManagerDelegate {
    let manager = CLLocationManager()
    var locationCallback: ((CLLocation?) -> Void)!
    var locationServicesEnabled = false
    var didFailWithError: Error?

    public func run(callback: @escaping (CLLocation?) -> Void) {
        locationCallback = callback
        manager.delegate = self
        manager.desiredAccuracy = kCLLocationAccuracyBestForNavigation
        manager.requestWhenInUseAuthorization()
        locationServicesEnabled = CLLocationManager.locationServicesEnabled()
        if locationServicesEnabled { manager.startUpdatingLocation() }
        else { locationCallback(nil) }
    }

   public func locationManager(_ manager: CLLocationManager,
                         didUpdateLocations locations: [CLLocation]) {
        locationCallback(locations.last!)
        manager.stopUpdatingLocation()
    }

    public func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        didFailWithError = error
        locationCallback(nil)
        manager.stopUpdatingLocation()
    }

    deinit {
        manager.stopUpdatingLocation()
    }
}

Don't forget to add the "NSLocationWhenInUseUsageDescription" in the info.plist.

Simple search MySQL database using php

First add HTML code:

<form action="" method="post">
<input type="text" name="search">
<input type="submit" name="submit" value="Search">
</form>

Now added PHP code:

<?php
$search_value=$_POST["search"];
$con=new mysqli($servername,$username,$password,$dbname);
if($con->connect_error){
    echo 'Connection Faild: '.$con->connect_error;
    }else{
        $sql="select * from information where First_Name like '%$search_value%'";

        $res=$con->query($sql);

        while($row=$res->fetch_assoc()){
            echo 'First_name:  '.$row["First_Name"];


            }       

        }
?>

Check if string contains only whitespace

I used following:

if str and not str.isspace():
  print('not null and not empty nor whitespace')
else:
  print('null or empty or whitespace')

How do I get a python program to do nothing?

You can use continue

if condition:
    continue
else:
    #do something

make bootstrap twitter dialog modal draggable

i did this:

$("#myModal").modal({}).draggable();

and it make my very standard/basic modal draggable.

not sure how/why it worked, but it did.

Java Byte Array to String to Byte Array

[JAVA 8]

import java.util.Base64;

String dummy= "dummy string";
byte[] byteArray = dummy.getBytes();

byte[] salt = new byte[]{ -47, 1, 16, ... }
String encoded = Base64.getEncoder().encodeToString(salt);

Proper Linq where clauses

The first one will be implemented:

Collection.Where(x => x.Age == 10)
          .Where(x => x.Name == "Fido") // applied to the result of the previous
          .Where(x => x.Fat == true)    // applied to the result of the previous

As opposed to the much simpler (and ~~far faster~~presumably faster):

// all in one fell swoop
Collection.Where(x => x.Age == 10 && x.Name == "Fido" && x.Fat == true)

How to get HttpContext.Current in ASP.NET Core?

Necromancing.
YES YOU CAN, and this is how.
A secret tip for those migrating large ~~junks~~ chunks of code:
The following method is an evil carbuncle of a hack which is actively engaged in carrying out the express work of satan (in the eyes of .NET Core framework developers), but it works:

In public class Startup

add a property

public IConfigurationRoot Configuration { get; }

And then add a singleton IHttpContextAccessor to DI in ConfigureServices.

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddSingleton<Microsoft.AspNetCore.Http.IHttpContextAccessor, Microsoft.AspNetCore.Http.HttpContextAccessor>();

Then in Configure

    public void Configure(
              IApplicationBuilder app
             ,IHostingEnvironment env
             ,ILoggerFactory loggerFactory
    )
    {

add the DI Parameter IServiceProvider svp, so the method looks like:

    public void Configure(
           IApplicationBuilder app
          ,IHostingEnvironment env
          ,ILoggerFactory loggerFactory
          ,IServiceProvider svp)
    {

Next, create a replacement class for System.Web:

namespace System.Web
{

    namespace Hosting
    {
        public static class HostingEnvironment 
        {
            public static bool m_IsHosted;

            static HostingEnvironment()
            {
                m_IsHosted = false;
            }

            public static bool IsHosted
            {
                get
                {
                    return m_IsHosted;
                }
            }
        }
    }


    public static class HttpContext
    {
        public static IServiceProvider ServiceProvider;

        static HttpContext()
        { }


        public static Microsoft.AspNetCore.Http.HttpContext Current
        {
            get
            {
                // var factory2 = ServiceProvider.GetService<Microsoft.AspNetCore.Http.IHttpContextAccessor>();
                object factory = ServiceProvider.GetService(typeof(Microsoft.AspNetCore.Http.IHttpContextAccessor));

                // Microsoft.AspNetCore.Http.HttpContextAccessor fac =(Microsoft.AspNetCore.Http.HttpContextAccessor)factory;
                Microsoft.AspNetCore.Http.HttpContext context = ((Microsoft.AspNetCore.Http.HttpContextAccessor)factory).HttpContext;
                // context.Response.WriteAsync("Test");

                return context;
            }
        }


    } // End Class HttpContext 


}

Now in Configure, where you added the IServiceProvider svp, save this service provider into the static variable "ServiceProvider" in the just created dummy class System.Web.HttpContext (System.Web.HttpContext.ServiceProvider)

and set HostingEnvironment.IsHosted to true

System.Web.Hosting.HostingEnvironment.m_IsHosted = true;

this is essentially what System.Web did, just that you never saw it (I guess the variable was declared as internal instead of public).

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, IServiceProvider svp)
{
    loggerFactory.AddConsole(Configuration.GetSection("Logging"));
    loggerFactory.AddDebug();

    ServiceProvider = svp;
    System.Web.HttpContext.ServiceProvider = svp;
    System.Web.Hosting.HostingEnvironment.m_IsHosted = true;


    app.UseCookieAuthentication(new CookieAuthenticationOptions()
    {
        AuthenticationScheme = "MyCookieMiddlewareInstance",
        LoginPath = new Microsoft.AspNetCore.Http.PathString("/Account/Unauthorized/"),
        AccessDeniedPath = new Microsoft.AspNetCore.Http.PathString("/Account/Forbidden/"),
        AutomaticAuthenticate = true,
        AutomaticChallenge = true,
        CookieSecure = Microsoft.AspNetCore.Http.CookieSecurePolicy.SameAsRequest

       , CookieHttpOnly=false

    });

Like in ASP.NET Web-Forms, you'll get a NullReference when you're trying to access a HttpContext when there is none, such as it used to be in Application_Start in global.asax.

I stress again, this only works if you actually added

services.AddSingleton<Microsoft.AspNetCore.Http.IHttpContextAccessor, Microsoft.AspNetCore.Http.HttpContextAccessor>();

like I wrote you should.
Welcome to the ServiceLocator pattern within the DI pattern ;)
For risks and side effects, ask your resident doctor or pharmacist - or study the sources of .NET Core at github.com/aspnet, and do some testing.

Perhaps a more maintainable method would be adding this helper class

namespace System.Web
{

    public static class HttpContext
    {
        private static Microsoft.AspNetCore.Http.IHttpContextAccessor m_httpContextAccessor;


        public static void Configure(Microsoft.AspNetCore.Http.IHttpContextAccessor httpContextAccessor)
        {
            m_httpContextAccessor = httpContextAccessor;
        }


        public static Microsoft.AspNetCore.Http.HttpContext Current
        {
            get
            {
                return m_httpContextAccessor.HttpContext;
            }
        }


    }


}

And then calling HttpContext.Configure in Startup->Configure

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, IServiceProvider svp)
{
    loggerFactory.AddConsole(Configuration.GetSection("Logging"));
    loggerFactory.AddDebug();


    System.Web.HttpContext.Configure(app.ApplicationServices.
        GetRequiredService<Microsoft.AspNetCore.Http.IHttpContextAccessor>()
    );

How to add line breaks to an HTML textarea?

Maybe someone find this useful:

I had problem with line breaks which were passed from server variable to javascript variable, and then javascript was writing them to textarea (using knockout.js value bindings).

the solution was double escaping new lines:

orginal.Replace("\r\n", "\\r\\n")

on the server side, because with just single escape chars javascript was not parsing.

Overriding the java equals() method - not working?

Consider:

Object obj = new Book();
obj.equals("hi");
// Oh noes! What happens now? Can't call it with a String that isn't a Book...

jQuery $.ajax(), pass success data into separate function

Although I am not 100% sure what you want (probably my brain is slow today), here is an example of a similar use to what you describe:

function GetProcedureById(procedureId)
{
    var includeMaster = true;
    pString = '{"procedureId":"' + procedureId.toString() + '","includeMaster":"' + includeMaster.toString() + '"}';
    $.ajax({
        type: "POST",
        contentType: "application/json; charset=utf-8",
        data: pString,
        datatype: "json",
        dataFilter: function(data)
        {
            var msg;
            if (typeof (JSON) !== 'undefined' &&
                    typeof (JSON.parse) === 'function')
                msg = JSON.parse(data);
            else
                msg = eval('(' + data + ')');
            if (msg.hasOwnProperty('d'))
                return msg.d;
            else
                return msg;
        },
        url: "webservice/ProcedureCodesService.asmx/GetProcedureById",
        success: function(msg)
        {
            LoadProcedure(msg);
        },
        failure: function(msg)
        {
            // $("#sometextplace").text("Procedure did not load");
        }
    });
};
/* build the Procedure option list */
function LoadProcedure(jdata)
{
    if (jdata.length < 10)
    {
        $("select#cptIcdProcedureSelect").attr('size', jdata.length);
    }
    else
    {
        $("select#cptIcdProcedureSelect").attr('size', '10');
    };
    var options = '';
    for (var i = 0; i < jdata.length; i++)
    {
        options += '<option value="' + jdata[i].Description + '">' + jdata[i].Description + ' (' + jdata[i].ProcedureCode + ')' + '</option>';
    };
    $("select#cptIcdProcedureSelect").html(options);
};

Extracting an attribute value with beautifulsoup

I would actually suggest you a time saving way to go with this assuming that you know what kind of tags have those attributes.

suppose say a tag xyz has that attritube named "staininfo"..

full_tag = soup.findAll("xyz")

And i wan't you to understand that full_tag is a list

for each_tag in full_tag:
    staininfo_attrb_value = each_tag["staininfo"]
    print staininfo_attrb_value

Thus you can get all the attrb values of staininfo for all the tags xyz

Create component to specific module with Angular-CLI

I use this particular command for generating components inside a module.

ng g c <module-directory-name>/<component-name>

This command will generate component local to the module. or You can change directory first by typing.

cd <module-directory-name>

and then create component.

ng g c <component-name>

Note: code enclosed in <> represent user specific names.

How to pipe list of files returned by find command to cat to view all the files

There are a few ways to pass the list of files returned by the find command to the cat command, though technically not all use piping, and none actually pipe directly to cat.

The simplest is to use backticks (`):
```
cat `find [whatever]`
```
This takes the output of find and effectively places it on the command line of cat. This doesn't work well if find has too much output (more than can fit on a command-line) or if the output has special characters (like spaces).
In some shells, including bash, one can use $() instead of backticks :
```
cat $(find [whatever])
```
This is less portable, but is nestable. Aside from that, it has pretty much the same caveats as backticks.
Because running other commands on what was found is a common use for find, find has an -exec action which executes a command for each file it finds:
```
find [whatever] -exec cat {} \;
```
The {} is a placeholder for the filename, and the \; marks the end of the command (It's possible to have other actions after -exec.)

This will run cat once for every single file rather than running a single instance of cat passing it multiple filenames which can be inefficient and might not have the behavior you want for some commands (though it's fine for cat). The syntax is also a awkward to type -- you need to escape the semicolon because semicolon is special to the shell!
Some versions of find (most notably the GNU version) let you replace ; with + to use -exec's append mode to run fewer instances of cat:
```
find [whatever] -exec cat {} +
```
This will pass multiple filenames to each invocation of cat, which can be more efficient.

Note that this is not guaranteed to use a single invocation, however. If the command line would be too long then the arguments are spread across multiple invocations of cat. For cat this is probably not a big deal, but for some other commands this may change the behavior in undesirable ways. On Linux systems, the command line length limit is quite large, so splitting into multiple invocations is quite rare compared to some other OSes.
The classic/portable approach is to use xargs:
```
find [whatever] | xargs cat
```
xargs runs the command specified (cat, in this case), and adds arguments based on what it reads from stdin. Just like -exec with +, this will break up the command-line if necessary. That is, if find produces too much output, it'll run cat multiple times. As mentioned in the section about -exec earlier, there are some commands where this splitting may result in different behavior. Note that using xargs like this has issues with spaces in filenames, as xargs just uses whitespace as a delimiter.
The most robust, portable, and efficient method also uses xargs:
```
find [whatever] -print0 | xargs -0 cat
```
The -print0 flag tells find to use \0 (null character) delimiters between filenames, and the -0 flag tells xargs to expect these \0 delimiters. This has pretty much identical behavior to the -exec...+ approach, though is more portable (but unfortunately more verbose).

javascript regex : only english letters allowed

Another option is to use the case-insensitive flag i, then there's no need for the extra character range A-Z.

var reg = /^[a-z]+$/i;
console.log( reg.test("somethingELSE") ); //true
console.log( "somethingELSE".match(reg)[0] ); //"somethingELSE"

Here's a DEMO on how this regex works with test() and match().

How do I remove diacritics (accents) from a string in .NET?

I often use an extenstion method based on another version I found here (see Replacing characters in C# (ascii)) A quick explanation:

Normalizing to form D splits charactes like è to an e and a nonspacing `
From this, the nospacing characters are removed
The result is normalized back to form C (I'm not sure if this is neccesary)

Code:

using System.Linq;
using System.Text;
using System.Globalization;

// namespace here
public static class Utility
{
    public static string RemoveDiacritics(this string str)
    {
        if (null == str) return null;
        var chars =
            from c in str.Normalize(NormalizationForm.FormD).ToCharArray()
            let uc = CharUnicodeInfo.GetUnicodeCategory(c)
            where uc != UnicodeCategory.NonSpacingMark
            select c;

        var cleanStr = new string(chars.ToArray()).Normalize(NormalizationForm.FormC);

        return cleanStr;
    }

    // or, alternatively
    public static string RemoveDiacritics2(this string str)
    {
        if (null == str) return null;
        var chars = str
            .Normalize(NormalizationForm.FormD)
            .ToCharArray()
            .Where(c=> CharUnicodeInfo.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark)
            .ToArray();

        return new string(chars).Normalize(NormalizationForm.FormC);
    }
}

Can you call ko.applyBindings to bind a partial view?

You should look at the with binding, as well as controlsDescendantBindings http://knockoutjs.com/documentation/custom-bindings-controlling-descendant-bindings.html

Best way to alphanumeric check in JavaScript

You can use this regex /^[a-z0-9]+$/i

Should C# or C++ be chosen for learning Games Programming (consoles)?

I'm not going to answer the original question since most post here have. I'm going to point something out to you that you missed in your post. Simply knowing C\C++\C# isn't going to get you a career in game development. Most game studios get dozens to hundreds of applications for a simple code monkey job. What makes you stand out compared to them? What makes you a better hire than someone else who has experience making games at another studio?

If you really want a career in the games industry, even on consoles, you should make a demo of some kind that shows what you know. C++ would be great language choice to use in the demo if you're applying for a console development position. You could show off more by making a tool in C#\XNA to create the assets for your demo. You'll show the hiring managers and tech leads that you're not JUST a C++ guy or JUST a C# guy: you're a developer.

jQuery .get error response function?

You can chain .fail() callback for error response.

$.get('http://example.com/page/2/', function(data){ 
   $(data).find('#reviews .card').appendTo('#reviews');
})
.fail(function() {
  //Error logic
})

Calculate age based on date of birth

I hope you will find this useful.

$query1="SELECT TIMESTAMPDIFF (YEAR, YOUR_DOB_COLUMN, CURDATE()) AS age FROM your_table WHERE id='$user_id'";
$res1=mysql_query($query1);
$row=mysql_fetch_array($res1);
echo $row['age'];

Read Variable from Web.Config

I am siteConfiguration class for calling all my appSetting like this way. I share it if it will help anyone.

add the following code at the "web.config"

<configuration>
   <configSections>
     <!-- some stuff omitted here -->
   </configSections>
   <appSettings>
      <add key="appKeyString" value="abc" />
      <add key="appKeyInt" value="123" />  
   </appSettings>
</configuration>

Now you can define a class for getting all your appSetting value. like this

using System; 
using System.Configuration;
namespace Configuration
{
   public static class SiteConfigurationReader
   {
      public static String appKeyString  //for string type value
      {
         get
         {
            return ConfigurationManager.AppSettings.Get("appKeyString");
         }
      }

      public static Int32 appKeyInt  //to get integer value
      {
         get
         {
            return ConfigurationManager.AppSettings.Get("appKeyInt").ToInteger(true);
         }
      }

      // you can also get the app setting by passing the key
      public static Int32 GetAppSettingsInteger(string keyName)
      {
          try
          {
            return Convert.ToInt32(ConfigurationManager.AppSettings.Get(keyName));
        }
        catch
        {
            return 0;
        }
      }
   }
}

Now add the reference of previous class and to access a key call like bellow

string appKeyStringVal= SiteConfigurationReader.appKeyString;
int appKeyIntVal= SiteConfigurationReader.appKeyInt;
int appKeyStringByPassingKey = SiteConfigurationReader.GetAppSettingsInteger("appKeyInt");

RandomForestClassfier.fit(): ValueError: could not convert string to float

You can't pass str to your model fit() method. as it mentioned here

The training input samples. Internally, it will be converted to dtype=np.float32 and if a sparse matrix is provided to a sparse csc_matrix.

Try transforming your data to float and give a try to LabelEncoder.

Find all table names with column name?

Please try the below query. Use sys.columns to get the details :-

SELECT c.name AS ColName, t.name AS TableName
FROM sys.columns c
    JOIN sys.tables t ON c.object_id = t.object_id
WHERE c.name LIKE '%MyCol%';

How to remove decimal part from a number in C#

Because the numbers after point is only zero, the best solution is to use the Math.Round(MyNumber)

Linq code to select one item

Depends how much you like the linq query syntax, you can use the extension methods directly like:

var item = Items.First(i => i.Id == 123);

And if you don't want to throw an error if the list is empty, use FirstOrDefault which returns the default value for the element type (null for reference types):

var item = Items.FirstOrDefault(i => i.Id == 123);

if (item != null)
{
    // found it
}

Single() and SingleOrDefault() can also be used, but if you are reading from a database or something that already guarantees uniqueness I wouldn't bother as it has to scan the list to see if there's any duplicates and throws. First() and FirstOrDefault() stop on the first match, so they are more efficient.

Of the First() and Single() family, here's where they throw:

First() - throws if empty/not found, does not throw if duplicate
FirstOrDefault() - returns default if empty/not found, does not throw if duplicate
Single() - throws if empty/not found, throws if duplicate exists
SingleOrDefault() - returns default if empty/not found, throws if duplicate exists

Read/write files within a Linux kernel module

You should be aware that you should avoid file I/O from within Linux kernel when possible. The main idea is to go "one level deeper" and call VFS level functions instead of the syscall handler directly:

Includes:

#include <linux/fs.h>
#include <asm/segment.h>
#include <asm/uaccess.h>
#include <linux/buffer_head.h>

Opening a file (similar to open):

struct file *file_open(const char *path, int flags, int rights) 
{
    struct file *filp = NULL;
    mm_segment_t oldfs;
    int err = 0;

    oldfs = get_fs();
    set_fs(get_ds());
    filp = filp_open(path, flags, rights);
    set_fs(oldfs);
    if (IS_ERR(filp)) {
        err = PTR_ERR(filp);
        return NULL;
    }
    return filp;
}

Close a file (similar to close):

void file_close(struct file *file) 
{
    filp_close(file, NULL);
}

Reading data from a file (similar to pread):

int file_read(struct file *file, unsigned long long offset, unsigned char *data, unsigned int size) 
{
    mm_segment_t oldfs;
    int ret;

    oldfs = get_fs();
    set_fs(get_ds());

    ret = vfs_read(file, data, size, &offset);

    set_fs(oldfs);
    return ret;
}

Writing data to a file (similar to pwrite):

int file_write(struct file *file, unsigned long long offset, unsigned char *data, unsigned int size) 
{
    mm_segment_t oldfs;
    int ret;

    oldfs = get_fs();
    set_fs(get_ds());

    ret = vfs_write(file, data, size, &offset);

    set_fs(oldfs);
    return ret;
}

Syncing changes a file (similar to fsync):

int file_sync(struct file *file) 
{
    vfs_fsync(file, 0);
    return 0;
}

[Edit] Originally, I proposed using file_fsync, which is gone in newer kernel versions. Thanks to the poor guy suggesting the change, but whose change was rejected. The edit was rejected before I could review it.

Elegant way to check for missing packages and install them?

Dason K. and I have the pacman package that can do this nicely. The function p_load in the package does this. The first line is just to ensure that pacman is installed.

if (!require("pacman")) install.packages("pacman")
pacman::p_load(package1, package2, package_n)

How to check if "Radiobutton" is checked?

Just as you would with a CheckBox

RadioButton rb;

rb = (RadioButton) findViewById(R.id.rb);

rb.isChecked();

Why does configure say no C compiler found when GCC is installed?

Sometime gcc had created as /usr/bin/gcc32. so please create a ln -s /usr/bin/gcc32 /usr/bin/gcc and then compile that ./configure.

What are the options for storing hierarchical data in a relational database?

This is a very partial answer to your question, but I hope still useful.

Microsoft SQL Server 2008 implements two features that are extremely useful for managing hierarchical data:

the HierarchyId data type.
common table expressions, using the with keyword.

Have a look at "Model Your Data Hierarchies With SQL Server 2008" by Kent Tegels on MSDN for starts. See also my own question: Recursive same-table query in SQL Server 2008

Return value in SQL Server stored procedure

Try to call your proc in this way:

DECLARE @UserIDout int

EXEC YOURPROC @EmailAddress = 'sdfds', @NickName = 'sdfdsfs', ..., @UserId = @UserIDout OUTPUT

SELECT @UserIDout

How do I convert datetime.timedelta to minutes, hours in Python?

Just use strftime :)

Something like that:

my_date = datetime.datetime(2013, 1, 7, 10, 31, 34, 243366, tzinfo=<UTC>)
print(my_date.strftime("%Y, %d %B"))

After edited your question to format timedelta, you could use:

def timedelta_tuple(timedelta_object):
   return timedelta_object.days, timedelta_object.seconds//3600, (timedelta_object.seconds//60)%60

How do I find the current directory of a batch file, and then use it for the path?

ElektroStudios answer is a bit misleading.

"when you launch a bat file the working dir is the dir where it was launched" This is true if the user clicks on the batch file in the explorer.

However, if the script is called from another script using the CALL command, the current working directory does not change.

Thus, inside your script, it is better to use %~dp0subfolder\file1.txt

Please also note that %~dp0 will end with a backslash when the current script is not in the current working directory. Thus, if you need the directory name without a trailing backslash, you could use something like

call :GET_THIS_DIR
echo I am here: %THIS_DIR%
goto :EOF

:GET_THIS_DIR
pushd %~dp0
set THIS_DIR=%CD%
popd
goto :EOF

Converting from longitude\latitude to Cartesian coordinates

You can do it this way on Java.

public List<Double> convertGpsToECEF(double lat, double longi, float alt) {

    double a=6378.1;
    double b=6356.8;
    double N;
    double e= 1-(Math.pow(b, 2)/Math.pow(a, 2));
    N= a/(Math.sqrt(1.0-(e*Math.pow(Math.sin(Math.toRadians(lat)), 2))));
    double cosLatRad=Math.cos(Math.toRadians(lat));
    double cosLongiRad=Math.cos(Math.toRadians(longi));
    double sinLatRad=Math.sin(Math.toRadians(lat));
    double sinLongiRad=Math.sin(Math.toRadians(longi));
    double x =(N+0.001*alt)*cosLatRad*cosLongiRad;
    double y =(N+0.001*alt)*cosLatRad*sinLongiRad;
    double z =((Math.pow(b, 2)/Math.pow(a, 2))*N+0.001*alt)*sinLatRad;

    List<Double> ecef= new ArrayList<>();
    ecef.add(x);
    ecef.add(y);
    ecef.add(z);

    return ecef;


}

ping: google.com: Temporary failure in name resolution

If you get the IP address from a DHCP server, you can also set the server to send a DNS server. Or add the nameserver 8.8.8.8 into /etc/resolvconf/resolv.conf.d/base file. The information in this file is included in the resolver configuration file even when no interfaces are configured.

A cycle was detected in the build path of project xxx - Build Path Problem

Mark circular dependencies as "Warning" in Eclipse tool to avoid "A CYCLE WAS DETECTED IN THE BUILD PATH" error.

In Eclipse go to:

Windows -> Preferences -> Java-> Compiler -> Building -> Circular Dependencies

ORDER BY using Criteria API

This is what you have to do since sess.createCriteria is deprecated:

CriteriaBuilder builder = getSession().getCriteriaBuilder();
CriteriaQuery<User> q = builder.createQuery(User.class);
Root<User> usr = q.from(User.class);
ParameterExpression<String> p = builder.parameter(String.class);
q.select(usr).where(builder.like(usr.get("name"),p))
  .orderBy(builder.asc(usr.get("name")));
TypedQuery<User> query = getSession().createQuery(q);
query.setParameter(p, "%" + Main.filterName + "%");
List<User> list = query.getResultList();

How do I format my oracle queries so the columns don't wrap?

set WRAP OFF
set PAGESIZE 0

Try using those settings.

How to create an array of 20 random bytes?

If you want a cryptographically strong random number generator (also thread safe) without using a third party API, you can use SecureRandom.

Java 6 & 7:

SecureRandom random = new SecureRandom();
byte[] bytes = new byte[20];
random.nextBytes(bytes);

Java 8 (even more secure):

byte[] bytes = new byte[20];
SecureRandom.getInstanceStrong().nextBytes(bytes);

How to git-svn clone the last n revisions from a Subversion repository?

I find myself using the following often to get a limited number of revisions out of our huge subversion tree (we're soon reaching svn revision 35000).

# checkout a specific revision
git svn clone -r N svn://some/repo/branch/some-branch
# enter it and get all commits since revision 'N'
cd some-branch
git svn rebase

And a good way to find out where a branch started is to do a svn log it and find the first one on the branch (the last one listed when doing):

svn log --stop-on-copy svn://some/repo/branch/some-branch

So far I have not really found the hassle worth it in tracking all branches. It takes too much time to clone and svn and git don't work together as good as I would like. I tend to create patch files and apply them on the git clone of another svn branch.

Run text file as commands in Bash

you can also just run it with a shell, for example:

bash example.txt

sh example.txt

"npm config set registry https://registry.npmjs.org/" is not working in windows bat file

We can also run npm install with registry options for multiple custom registry URLs.

npm install --registry=https://registry.npmjs.org/ 
npm install --registry=https://custom.npm.registry.com/

EPPlus - Read Excel Table

This is my working version. Note that the resolvers code is not shown but are a spin on my implementation which allows columns to be resolved even though they are named slightly differently in each worksheet.

public static IEnumerable<T> ToArray<T>(this ExcelWorksheet worksheet, List<PropertyNameResolver> resolvers) where T : new()
{

  // List of all the column names
  var header = worksheet.Cells.GroupBy(cell => cell.Start.Row).First();

  // Get the properties from the type your are populating
  var properties = typeof(T).GetProperties().ToList();


  var start = worksheet.Dimension.Start;
  var end = worksheet.Dimension.End;

  // Resulting list
  var list = new List<T>();

  // Iterate the rows starting at row 2 (ie start.Row + 1)
  for (int row = start.Row + 1; row <= end.Row; row++)
  {
    var instance = new T();
    for (int col = start.Column; col <= end.Column; col++)
    {
      object value = worksheet.Cells[row, col].Text;

      // Get the column name zero based (ie col -1)
      var column = (string)header.Skip(col - 1).First().Value;

      // Gets the corresponding property to set
      var property = properties.Property(resolvers, column);

      try
      {
        var propertyName = property.PropertyType.IsGenericType
          ? property.PropertyType.GetGenericArguments().First().FullName
          : property.PropertyType.FullName;


        // Implement setter code as needed. 
        switch (propertyName)
        {
          case "System.String":
            property.SetValue(instance, Convert.ToString(value));
            break;
          case "System.Int32":
            property.SetValue(instance, Convert.ToInt32(value));
            break;
          case "System.DateTime":
            if (DateTime.TryParse((string) value, out var date))
            {
              property.SetValue(instance, date);
            }
            property.SetValue(instance, FromExcelSerialDate(Convert.ToInt32(value)));
            break;
          case "System.Boolean":
            property.SetValue(instance, (int)value == 1);
            break;
        }
      }
      catch (Exception e)
      {
        // instance property is empty because there was a problem.
      }

    } 
    list.Add(instance);
  }
  return list;
}

// Utility function taken from the above post's inline function.
public static DateTime FromExcelSerialDate(int excelDate)
{
  if (excelDate < 1)
    throw new ArgumentException("Excel dates cannot be smaller than 0.");

  var dateOfReference = new DateTime(1900, 1, 1);

  if (excelDate > 60d)
    excelDate = excelDate - 2;
  else
    excelDate = excelDate - 1;
  return dateOfReference.AddDays(excelDate);
}

Create auto-numbering on images/figures in MS Word

Office 2007

Right click the figure, select Insert Caption, Select Numbering, check box next to 'Include chapter number', select OK, Select OK again, then you figure identifier should be updated.

Proper way to make HTML nested list?

Option 2

<ul>
<li>Choice A</li>
<li>Choice B
  <ul>
    <li>Sub 1</li>
    <li>Sub 2</li>
  </ul>
</li>
</ul>

Nesting Lists - UL

How to get correct timestamp in C#

Int32 unixTimestamp = (Int32)(TIME.Subtract(new DateTime(1970, 1, 1))).TotalSeconds;

"TIME" is the DateTime object that you would like to get the unix timestamp for.

Get the index of a certain value in an array in PHP

The problem is that you don't have a numerical index on your array.
Using array_values() will create a zero indexed array that you can then search using array_search() bypassing the need to use a for loop.

$list = ['string1', 'string2', 'string3'];
$index = array_search('string2',array_values($list));

Filter array to have unique values

Filtering an array to contain unique values can be achieved using the JavaScript Set and Array.from method, as shown below:

Array.from(new Set(arrayOfNonUniqueValues));

Set

The Set object lets you store unique values of any type, whether primitive values or object references.

Return value A new Set object.

Array.from()

The Array.from() method creates a new Array instance from an array-like or iterable object.

Return value A new Array instance.

Example Code:

_x000D_

const array = ["X_row7", "X_row4", "X_row6", "X_row10", "X_row8", "X_row9", "X_row11", "X_row7", "X_row4", "X_row6", "X_row10", "X_row8", "X_row9", "X_row11", "X_row7", "X_row4", "X_row6", "X_row10", "X_row8", "X_row9", "X_row11", "X_row7", "X_row4", "X_row6", "X_row10", "X_row8", "X_row9", "X_row11", "X_row7", "X_row4", "X_row6", "X_row10", "X_row8", "X_row9", "X_row11", "X_row7", "X_row4", "X_row6", "X_row10", "X_row8", "X_row9", "X_row11"]_x000D_
_x000D_
const uniqueArray = Array.from(new Set(array));_x000D_
_x000D_
console.log("uniqueArray: ", uniqueArray);

_x000D_

Eclipse shows errors but I can't find them

I had a red X on a folder, but not on any of the files inside it. The only thing that fixed it was clicking and dragging some of the files from the problem folder into another folder, and then performing Maven -> Update Project. I could then drag the files back without the red X returning.

The type java.lang.CharSequence cannot be resolved in package declaration

Your Eclipse software suite doesn't support Java 1.8

Download a newer version of Eclipse.

Aesthetics must either be length one, or the same length as the dataProblems

I encountered this problem because the dataset was filtered wrongly and the resultant data frame was empty. Even the following caused the error to show:

ggplot(df, aes(x="", y = y, fill=grp))

because df was empty.

Can you do a partial checkout with Subversion?

If you already have the full local copy, you can remove unwanted sub folders by using --set-depth command.

svn update --set-depth=exclude www

See: http://blogs.collab.net/subversion/sparse-directories-now-with-exclusion

The set-depth command support multipile paths.

Updating the root local copy will not change the depth of the modified folder.

To restore the folder to being recusively checkingout, you could use --set-depth again with infinity param.

svn update --set-depth=infinity www

How to extend a class in python?

Another way to extend (specifically meaning, add new methods, not change existing ones) classes, even built-in ones, is to use a preprocessor that adds the ability to extend out of/above the scope of Python itself, converting the extension to normal Python syntax before Python actually gets to see it.

I've done this to extend Python 2's str() class, for instance. str() is a particularly interesting target because of the implicit linkage to quoted data such as 'this' and 'that'.

Here's some extending code, where the only added non-Python syntax is the extend:testDottedQuad bit:

extend:testDottedQuad
def testDottedQuad(strObject):
    if not isinstance(strObject, basestring): return False
    listStrings = strObject.split('.')
    if len(listStrings) != 4: return False
    for strNum in listStrings:
        try:    val = int(strNum)
        except: return False
        if val < 0: return False
        if val > 255: return False
    return True

After which I can write in the code fed to the preprocessor:

if '192.168.1.100'.testDottedQuad():
    doSomething()

dq = '216.126.621.5'
if not dq.testDottedQuad():
    throwWarning();

dqt = ''.join(['127','.','0','.','0','.','1']).testDottedQuad()
if dqt:
    print 'well, that was fun'

The preprocessor eats that, spits out normal Python without monkeypatching, and Python does what I intended it to do.

Just as a c preprocessor adds functionality to c, so too can a Python preprocessor add functionality to Python.

My preprocessor implementation is too large for a stack overflow answer, but for those who might be interested, it is here on GitHub.

How to remove unused imports from Eclipse

I just found the way. Right click on the desired package then Source -> Organize Imports.

Shortcut keys:

Windows: Ctrl + Shift + O
Mac: Cmd + Shift + O

Number of lines in a file in Java

On Unix-based systems, use the wc command on the command-line.

How do I copy directories recursively with gulp?

Turns out that to copy a complete directory structure gulp needs to be provided with a base for your gulp.src() method.

So gulp.src( [ files ], { "base" : "." }) can be used in the structure above to copy all the directories recursively.

If, like me, you may forget this then try:

gulp.copy=function(src,dest){
    return gulp.src(src, {base:"."})
        .pipe(gulp.dest(dest));
};

Is a new line = \n OR \r\n?

The given answer is far from complete. In fact, it is so far from complete that it tends to lead the reader to believe that this answer is OS dependent when it isn't. It also isn't something which is programming language dependent (as some commentators have suggested). I'm going to add more information in order to make this more clear. First, lets give the list of current new line variations (as in, what they've been since 1999):

\r\n is only used on Windows Notepad, the DOS command line, most of the Windows API and in some (older) Windows apps.
\n is used for all other systems, applications and the Internet.

You'll notice that I've put most Windows apps in the \n group which may be slightly controversial but before you disagree with this statement, please grab a UNIX formatted text file and try it in 10 web friendly Windows applications of your choice (which aren't listed in my exceptions above). What percentage of them handled it just fine? You'll find that they (practically) all implement auto detection of line endings or just use \n because, while Windows may use \r\n, the Internet uses \n. Therefore, it is best practice for applications to use \n alone if you want your output to be Internet friendly.

PHP also defines a newline character called PHP_EOL. This constant is set to the OS specific newline string for the machine PHP is running on (\r\n for Windows and \n for everything else). This constant is not very useful for webpages and should be avoided for HTML output or for writing most text to files. It becomes VERY useful when we move to command line output from PHP applications because it will allow your application to output to a terminal Window in a consistent manner across all supported OSes.

If you want your PHP applications to work from any server they are placed on, the two biggest things to remember are that you should always just use \n unless it is terminal output (in which case you use PHP_EOL) and you should also ALWAYS use / for your path separator (not \).

The even longer explanation:

An application may choose to use whatever line endings it likes regardless of the default OS line ending style. If I want my text editor to print a newline every time it encounters a period that is no harder than using the \n to represent a newline because I'm interpreting the text as I display it anyway. IOW, I'm fiddling around with measuring the width of each character so it knows where to display the next so it is very simple to add a statement saying that if the current char is a period then perform a newline action (or if it is a \n then display a period).

Aside from the null terminator, no character code is sacred and when you write a text editor or viewer you are in charge of translating the bits in your file into glyphs (or carriage returns) on the screen. The only thing that distinguishes a control character such as the newline from other characters is that most font sets don't include them (meaning they don't have a visual representation available).

That being said, if you are working at a higher level of abstraction then you probably aren't making your own textbox controls. If this is the case then you're stuck with whatever line ending that control makes available to you. Even in this case it is a simple matter to automatically detect the line ending style of any string and make the conversion before you load your text into the control and then undo it when you read from that control. Meaning, that if you're a desktop application dev and your application doesn't recognize \n as a newline then it isn't a very friendly application and you really have no excuse because it isn't hard to make it the right way. It also means that whomever wrote Notepad should be ashamed of himself because it really is very easy to do much better and so many people suffer through using it every day.

TypeError: can't use a string pattern on a bytes-like object in re.findall()

The problem is that your regex is a string, but html is bytes:

>>> type(html)
<class 'bytes'>

Since python doesn't know how those bytes are encoded, it throws an exception when you try to use a string regex on them.

You can either decode the bytes to a string:

html = html.decode('ISO-8859-1')  # encoding may vary!
title = re.findall(pattern, html)  # no more error

Or use a bytes regex:

regex = rb'<title>(,+?)</title>'
#        ^

In this particular context, you can get the encoding from the response headers:

with urllib.request.urlopen(url) as response:
    encoding = response.info().get_param('charset', 'utf8')
    html = response.read().decode(encoding)

See the urlopen documentation for more details.

How to convert empty spaces into null values, using SQL Server?

Maybe something like this?

UPDATE [MyTable]
SET [SomeField] = NULL
WHERE [SomeField] is not NULL
AND LEN(LTRIM(RTRIM([SomeField]))) = 0

How to dismiss ViewController in Swift?

In Swift 3.0

If you want to dismiss a presented view controller

self.dismiss(animated: true, completion: nil)

General guidelines to avoid memory leaks in C++

Others have mentioned ways of avoiding memory leaks in the first place (like smart pointers). But a profiling and memory-analysis tool is often the only way to track down memory problems once you have them.

Valgrind memcheck is an excellent free one.

How to use forEach in vueJs?

This is an example of forEach usage:

let arr = [];

this.myArray.forEach((value, index) => {
    arr.push(value);
    console.log(value);
    console.log(index);
});

In this case, "myArray" is an array on my data.

You can also loop through an array using filter, but this one should be used if you want to get a new list with filtered elements of your array.

Something like this:

const newArray = this.myArray.filter((value, index) => {
    console.log(value);
    console.log(index);
    if (value > 5) return true;
});

and the same can be written as:

const newArray = this.myArray.filter((value, index) => value > 5);

Both filter and forEach are javascript methods and will work just fine with VueJs. Also, it might be interesting taking a look at this:

https://developer.mozilla.org/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach

Get JSON data from external URL and display it in a div as plain text

Since it's an external resource you'd need to go with JSONP because of the Same origin policy.
To do that you need to add the querystring parameter callback:

$.getJSON("http://myjsonsource?callback=?", function(data) {
    // Get the element with id summary and set the inner text to the result.
    $('#summary').text(data.result);
});

Convert laravel object to array

Object to array

$array = (array) $players_Obj;  

$object = new StdClass;
$object->foo = 1;
$object->bar = 2;

var_dump( (array) $object );

Output:

array(2) {
    'foo' => int(1)
    'bar' => int(2)
}

Calling a function in jQuery with click()

$("#closeLink").click(closeIt);

Let's say you want to call your function passing some args to it i.e., closeIt(1, false). Then, you should build an anonymous function and call closeIt from it.

$("#closeLink").click(function() {
    closeIt(1, false);
});

SqlDataAdapter vs SqlDataReader

The answer to that can be quite broad.

Essentially, the major difference for me that usually influences my decisions on which to use is that with a SQLDataReader, you are "streaming" data from the database. With a SQLDataAdapter, you are extracting the data from the database into an object that can itself be queried further, as well as performing CRUD operations on.

Obviously with a stream of data SQLDataReader is MUCH faster, but you can only process one record at a time. With a SQLDataAdapter, you have a complete collection of the matching rows to your query from the database to work with/pass through your code.

WARNING: If you are using a SQLDataReader, ALWAYS, ALWAYS, ALWAYS make sure that you write proper code to close the connection since you are keeping the connection open with the SQLDataReader. Failure to do this, or proper error handling to close the connection in case of an error in processing the results will CRIPPLE your application with connection leaks.

Pardon my VB, but this is the minimum amount of code you should have when using a SqlDataReader:

Using cn As New SqlConnection("..."), _
      cmd As New SqlCommand("...", cn)

    cn.Open()
    Using rdr As SqlDataReader = cmd.ExecuteReader()
        While rdr.Read()
            ''# ...
        End While
    End Using
End Using

equivalent C#:

using (var cn = new SqlConnection("..."))
using (var cmd = new SqlCommand("..."))
{
    cn.Open();
    using(var rdr = cmd.ExecuteReader())
    {
        while(rdr.Read())
        {
            //...
        }
    }
}

How to check the version of GitLab?

You can view GitLab's version at: https://your.domain.name/help

Or via terminal: gitlab-rake gitlab:env:info

Programs & Examples On #Preloader

Preloading CSS Images

html5 audio player - jquery toggle click play/pause?

How to count the occurrence of certain item in an ndarray?

VB.Net .Clear() or txtbox.Text = "" textbox clear methods

What does SQL clause "GROUP BY 1" mean?

Reading a .txt file using Scanner class in Java

Calling a particular PHP function on form submit

How long is the SHA256 hash?

Best way to check that element is not present using Selenium WebDriver with java

Bower: ENOGIT Git is not installed or not in the PATH

Programmatically go back to the previous fragment in the backstack

SQL Server : Arithmetic overflow error converting expression to data type int

How to use onResume()?

Can someone explain how to implement the jQuery File Upload plugin?

`IF` statement with 3 possible answers each based on 3 different ranges

How to prevent scanf causing a buffer overflow in C?

I want to get Year, Month, Day, etc from Java Date to compare with Gregorian Calendar date in Java. Is this possible?

Javascript communication between browser tabs/windows

How to give a pandas/matplotlib bar graph custom colors

SQL query for a carriage return in a string and ultimately removing carriage return

Reading multiple Scanner inputs

How to run an awk commands in Windows?

Is there a way to detect if a browser window is not currently active?

convert string array to string

Mixing C# & VB In The Same Project

ElasticSearch, Sphinx, Lucene, Solr, Xapian. Which fits for which usage?

Find the closest ancestor element that has a specific class

Javascript array declaration: new Array(), new Array(3), ['a', 'b', 'c'] create arrays that behave differently

INSERT INTO from two different server database

Unit tests vs Functional tests

Promise.all().then() resolve?

How to solve 'Redirect has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header'?

Didn't Java once have a Pair class?

Parsing jQuery AJAX response

sh: 0: getcwd() failed: No such file or directory on cited drive

Why am I getting a "401 Unauthorized" error in Maven?

How to find GCD, LCM on a set of numbers

How do I set the maximum line length in PyCharm?

jQuery how to bind onclick event to dynamically added HTML element

How to extract text from a string using sed?

Open URL in new window with JavaScript

Example

How to log SQL statements in Spring Boot?

Get Value of Row in Datatable c#

CSS submit button weird rendering on iPad/iPhone

Templated check for the existence of a class member function?

How to enable PHP short tags?

How to use WinForms progress bar?

Does List<T> guarantee insertion order?

How to print the contents of RDD?

MVC razor form with multiple different submit buttons?

How can I produce an effect similar to the iOS 7 blur view?

How to set IntelliJ IDEA Project SDK

How can I extract the folder path from file path in Python?

Importing class from another file

Converting between java.time.LocalDateTime and java.util.Date

Meaning of Choreographer messages in Logcat

GDB: break if variable equal value

Setting a timeout for socket operations

Reduce left and right margins in matplotlib plot

Wait for a void async method

Run class in Jar file

How to put an image in div with CSS?

How to create a sub array from another array in Java?

Writing handler for UIAlertAction

Can I get div's background-image url?

What is 'Currying'?

IntelliJ does not show 'Class' when we right click and select 'New'

Largest and smallest number in an array

Send auto email programmatically

How do I create and read a value from cookie?

static const vs #define

Get second child using jQuery

Without jQuery:

change Oracle user account status from EXPIRE(GRACE) to OPEN

Angular 6 Material mat-select change method removed

How to go back to previous page if back button is pressed in WebView?

Passing arguments to angularjs filters

calculating number of days between 2 columns of dates in data frame