Where do I find old versions of Android NDK?

As user3486832 mentioned, you can use archive.org: http://web.archive.org/web/*/https://developer.android.com/tools/sdk/ndk/index.html

gradlew: Permission Denied

if it doesn't work after chmod'ing make sure you aren't trying to execute it inside the /tmp directory.

How to check a string against null in java?

Well, the last time someone asked this silly question, the answer was:

someString.equals("null")

This "fix" only hides the bigger problem of how null becomes "null" in the first place, though.

Removing the first 3 characters from a string

Use the substring method of the String class :

String removeCurrency=amount.getText().toString().substring(3);

How can Print Preview be called from Javascript?

I think the best that's possible in cross-browser JavaScript is window.print(), which (in Firefox 3, for me) brings up the 'print' dialog and not the print preview dialog.

FYI, the print dialog is your computer's Print popup, what you get when you do Ctrl-p. The print preview is Firefox's own Preview window, and it has more options. It's what you get with Firefox Menu > Print...

Please add a @Pipe/@Directive/@Component annotation. Error

You get this error when you wrongly add shared service to "declaration" in your appmodules instead of adding it to "provider".

How to format string to money

Once you have your string in a double/decimal to get it into the correct formatting for a specific locale use

double amount = 1234.95;

amount.ToString("C") // whatever the executing computer thinks is the right fomat

amount.ToString("C", System.Globalization.CultureInfo.GetCultureInfo("en-ie"))    //  €1,234.95
amount.ToString("C", System.Globalization.CultureInfo.GetCultureInfo("es-es"))    //  1.234,95 € 
amount.ToString("C", System.Globalization.CultureInfo.GetCultureInfo("en-GB"))    //  £1,234.95 

amount.ToString("C", System.Globalization.CultureInfo.GetCultureInfo("en-au"))    //  $1,234.95
amount.ToString("C", System.Globalization.CultureInfo.GetCultureInfo("en-us"))    //  $1,234.95
amount.ToString("C", System.Globalization.CultureInfo.GetCultureInfo("en-ca"))    //  $1,234.95

Is there a naming convention for MySQL?

as @fabrizio-valencia said use lower case. in windows if you export mysql database (phpmyadmin) the tables name will converted to lower case and this lead to all sort of problems. see Are table names in MySQL case sensitive?

Is there a way to 'uniq' by column?

awk -F"," '!_[$1]++' file

-F sets the field separator.
$1 is the first field.
_[val] looks up val in the hash _(a regular variable).
++ increment, and return old value.
! returns logical not.
there is an implicit print at the end.

How do I POST urlencoded form data with $http without jQuery?

URL-encoding variables using only AngularJS services

With AngularJS 1.4 and up, two services can handle the process of url-encoding data for POST requests, eliminating the need to manipulate the data with transformRequest or using external dependencies like jQuery:

$httpParamSerializerJQLike - a serializer inspired by jQuery's .param() (recommended)
$httpParamSerializer - a serializer used by Angular itself for GET requests

Example usage

$http({
  url: 'some/api/endpoint',
  method: 'POST',
  data: $httpParamSerializerJQLike($scope.appForm.data), // Make sure to inject the service you choose to the controller
  headers: {
    'Content-Type': 'application/x-www-form-urlencoded' // Note the appropriate header
  }
}).then(function(response) { /* do something here */ });

See a more verbose Plunker demo

How are `$httpParamSerializerJQLike` and `$httpParamSerializer` different

In general, it seems $httpParamSerializer uses less "traditional" url-encoding format than $httpParamSerializerJQLike when it comes to complex data structures.

For example (ignoring percent encoding of brackets):

• Encoding an array

{sites:['google', 'Facebook']} // Object with array property

sites[]=google&sites[]=facebook // Result with $httpParamSerializerJQLike

sites=google&sites=facebook // Result with $httpParamSerializer

• Encoding an object

{address: {city: 'LA', country: 'USA'}} // Object with object property

address[city]=LA&address[country]=USA // Result with $httpParamSerializerJQLike

address={"city": "LA", country: "USA"} // Result with $httpParamSerializer

rails 3.1.0 ActionView::Template::Error (application.css isn't precompiled)

A quick fix for capistrano user is to put this line to Capfile

# Uncomment if you are using Rails' asset pipeline
load 'deploy/assets'

Validating Phone Numbers Using Javascript

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="../Homepage-30-06-2016/Css.css" >
<title>Form</title>

<script type="text/javascript">

        function isChar(evt) {
            evt = (evt) ? evt : window.event;
            var charCode = (evt.which) ? evt.which : evt.keyCode;
            if (charCode > 47 && charCode < 58) {

                document.getElementById("error").innerHTML = "*Please Enter Your Name Only";
                document.getElementById("fullname").focus();
                document.getElementById("fullname").style.borderColor = 'red';
                return false;
            }
            else {
                document.getElementById("error").innerHTML = "";
                document.getElementById("fullname").style.borderColor = '';

                return true;
            }
        }
</script>
</head>

<body>

        <h1 style="margin-left:20px;"Registration Form>Registration Form</h1><hr/>

           Name: <input id="fullname" type="text" placeholder="Full Name*"
                 name="fullname" onKeyPress="return isChar(event)" onChange="return isChar(event);"/><label id="error"></label><br /><br />

<button type="submit" id="submit" name="submit" onClick="return valid(event)" class="btn btn-link text-uppercase"> Submit now</button>

close fxml window by code, javafx

If you have a window which extends javafx.application.Application; you can use the following method. (This will close the whole application, not just the window. I misinterpreted the OP, thanks to the commenters for pointing it out).

Platform.exit();

Example:

public class MainGUI extends Application {
.........

Button exitButton = new Button("Exit");
exitButton.setOnAction(new ExitButtonListener());
.........

public class ExitButtonListener implements EventHandler<ActionEvent> {

  @Override
  public void handle(ActionEvent arg0) {
    Platform.exit();
  }
}

Edit for the beauty of Java 8:

 public class MainGUI extends Application {
    .........

    Button exitButton = new Button("Exit");
    exitButton.setOnAction(actionEvent -> Platform.exit());
 }

Converting String to Cstring in C++

string name;
char *c_string;

getline(cin, name);

c_string = new char[name.length()];

for (int index = 0; index < name.length(); index++){
    c_string[index] = name[index];
}
c_string[name.length()] = '\0';//add the null terminator at the end of
                              // the char array

I know this is not the predefined method but thought it may be useful to someone nevertheless.

The view or its master was not found or no view engine supports the searched locations

Problem:

Your View cannot be found in default locations.

Explanation:

Views should be in the same folder named as the Controller or in the Shared folder.

Solution:

Either move your View to the MyAccount folder or create a HomeController.

Alternatives:

If you don't want to move your View or create a new Controller you can check at this link.

How to provide shadow to Button

you can use this great library https://github.com/BluRe-CN/ComplexView and it is really easy to use

A button to start php script, how?

What exactly do you mean by "starts my php script"? What kind of PHP script? One to generate an HTML response for an end-user, or one that simply performs some kind of data processing task? If you are familiar with using the tag and how it interacts with PHP, then you should only need to POST to your target PHP script using an button of type "submit". If you are not familiar with forms, take a look here.

Git: Find the most recent common ancestor of two branches

You are looking for git merge-base. Usage:

$ git merge-base branch2 branch3
050dc022f3a65bdc78d97e2b1ac9b595a924c3f2

PHP $_POST not working?

A few thing you could do:

Make sure that the "action" attribute on your form leads to the correct destination.
Try using $_REQUEST[] instead of $_POST, see if there is any change.
[Optional] Try including both a 'name' and an 'id' attribute e.g.
```
<input type="text" name="firstname" id="firstname">
```
If you are in a Linux environment, check that you have both Read/Write permissions to the file.

In addition, this link might also help.

EDIT:

You could also substitute

<code>if(isset($_POST['submit'])){</code>

with this:

<code>if($_SERVER['REQUEST_METHOD'] == "POST"){ </code>

This is always the best way of checking whether or not a form has been submitted

How to make Bootstrap Panel body with fixed height

HTML :

<div class="span4">
  <div class="panel panel-primary">
    <div class="panel-heading">jhdsahfjhdfhs</div>
    <div class="panel-body panel-height">fdoinfds sdofjohisdfj</div>
  </div>
</div>

CSS :

.panel-height {
  height: 100px; / change according to your requirement/
}

Add an element to an array in Swift

Example: students = ["Ben" , "Ivy" , "Jordell"]

1) To add single elements to the end of an array, use the append(_:)

students.append(\ "Maxime" )

2) Add multiple elements at the same time by passing another array or a sequence of any kind to the append(contentsOf:) method

students.append(contentsOf: ["Shakia" , "William"])

3) To add new elements in the middle of an array by using the insert(_:at:) method for single elements

students.insert("Liam" , at:2 )

4) Using insert(contentsOf:at:) to insert multiple elements from another collection or array literal

students.insert(['Tim','TIM' at: 2 )

Combining node.js and Python

I've had a lot of success using thoonk.js along with thoonk.py. Thoonk leverages Redis (in-memory key-value store) to give you feed (think publish/subscribe), queue and job patterns for communication.

Why is this better than unix sockets or direct tcp sockets? Overall performance may be decreased a little, however Thoonk provides a really simple API that simplifies having to manually deal with a socket. Thoonk also helps make it really trivial to implement a distributed computing model that allows you to scale your python workers to increase performance, since you just spin up new instances of your python workers and connect them to the same redis server.

Remove sensitive files and their commits from Git history

In my android project I had admob_keys.xml as separated xml file in app/src/main/res/values/ folder. To remove this sensitive file I used below script and worked perfectly.

git filter-branch --force --index-filter \
'git rm --cached --ignore-unmatch  app/src/main/res/values/admob_keys.xml' \
--prune-empty --tag-name-filter cat -- --all

How do I make a new line in swift

`"\n"` is not working everywhere!

For example in email, it adds the exact "\n" into the text instead of a new line if you use it in the custom keyboard like: textDocumentProxy.insertText("\n")

There are another newLine characters available but I can't just simply paste them here (Because they make a new lines).

using this extension:

extension CharacterSet {
    var allCharacters: [Character] {
        var result: [Character] = []
        for plane: UInt8 in 0...16 where self.hasMember(inPlane: plane) {
            for unicode in UInt32(plane) << 16 ..< UInt32(plane + 1) << 16 {
                if let uniChar = UnicodeScalar(unicode), self.contains(uniChar) {
                    result.append(Character(uniChar))
                }
            }
        }
        return result
    }
}

you can access all characters in any CharacterSet. There is a character set called newlines. Use one of them to fulfill your requirements:

let newlines = CharacterSet.newlines.allCharacters
for newLine in newlines {
    print("Hello World \(newLine) This is a new line")
}

Then store the one you tested and worked everywhere and use it anywhere. Note that you can't relay on the index of the character set. It may change.

But most of the times "\n" just works as expected.

CSS3 transform not working

In webkit-based browsers(Safari and Chrome), -webkit-transform is ignored on inline elements.. Set display: inline-block; to make it work. For demonstration/testing purposes, you may also want to use a negative angle or a transformation-origin lest the text is rotated out of the visible area.

How to access Spring context in jUnit tests annotated with @RunWith and @ContextConfiguration?

Since the tests will be instantiated like a Spring bean too, you just need to implement the ApplicationContextAware interface:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"/services-test-config.xml"})
public class MySericeTest implements ApplicationContextAware
{

  @Autowired
  MyService service;
...
    @Override
    public void setApplicationContext(ApplicationContext context)
            throws BeansException
    {
        // Do something with the context here
    }
}

Java Desktop application: SWT vs. Swing

pro swing:

The biggest advantage of swing IMHO is that you do not need to ship the libraries with you application (which avoids dozen of MB(!)).
Native look and feel is much better for swing than in the early years
performance is comparable to swt (swing is not slow!)
NetBeans offers Matisse as a comfortable component builder.
The integration of Swing components within JavaFX is easier.

But at the bottom line I wouldn't suggest to use 'pure' swing or swt ;-) There are several application frameworks for swing/swt out. Look here. The biggest players are netbeans (swing) and eclipse (swt). Another nice framework could be griffon and a nice 'set of components' is pivot (swing). Griffon is very interesting because it integrates a lot of libraries and not only swing; also pivot, swt, etc

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space

If you're recompiling a disassembled APK with APK tool:

Just Set Memory Allocation a little bigger

set switch -Xmx1024mto -Xmx2048m

java -Xmx2048m -jar signapk.jar -w testkey.x509.pem testkey.pk8 "%APKOUT%" "%SIGNED%"

you're good to go.. :)

If input value is blank, assign a value of "empty" with Javascript

You can set a callback function for the onSubmit event of the form and check the contents of each field. If it contains nothing you can then fill it with the string "empty":

<form name="my_form" action="validate.php" onsubmit="check()">
    <input type="text" name="text1" />
    <input type="submit" value="submit" />
</form>

and in your js:

function check() {
    if(document.forms["my_form"]["text1"].value == "")
        document.forms["my_form"]["text1"].value = "empty";
}

How to insert a file in MySQL database?

The other answers will give you a good idea how to accomplish what you have asked for....

However

There are not many cases where this is a good idea. It is usually better to store only the filename in the database and the file on the file system.

That way your database is much smaller, can be transported around easier and more importantly is quicker to backup / restore.

how to write an array to a file Java

private static void saveArrayToFile(String fileName, int[] array) throws IOException {
    Files.write( // write to file
        Paths.get(fileName), // get path from file
        Collections.singleton(Arrays.toString(array)), // transform array to collection using singleton
        Charset.forName("UTF-8") // formatting
    );
}

How to send a pdf file directly to the printer using JavaScript?

There are two steps you need to take.

First, you need to put the PDF in an iframe.

  <iframe id="pdf" name="pdf" src="document.pdf"></iframe>

To print the iframe you can look at the answers here:

Javascript Print iframe contents only

If you want to print the iframe automatically after the PDF has loaded, you can add an onload handler to the <iframe>:

  <iframe onload="isLoaded()" id="pdf" name="pdf" src="document.pdf"></iframe>

the loader can look like this:

function isLoaded()
{
  var pdfFrame = window.frames["pdf"];
  pdfFrame.focus();
  pdfFrame.print();
}

This will display the browser's print dialog, and then print just the PDF document itself. (I personally use the onload handler to enable a "print" button so the user can decide to print the document, or not).

I'm using this code pretty much verbatim in Safari and Chrome, but am yet to try it on IE or Firefox.

Null check in an enhanced for loop

With Java 8 Optional:

for (Object object : Optional.ofNullable(someList).orElse(Collections.emptyList())) {
    // do whatever
}

How to parse JSON to receive a Date object in JavaScript?

I know this is a very old thread but I wish to post this to help those who bump into this like I did.

if you don't care about using a 3rd party script, you can use moment,js Then you can use .format() to format it to anything you want it to.

Can curl make a connection to any TCP ports, not just HTTP/HTTPS?

Of course:

curl http://example.com:11740
curl https://example.com:11740

Port 80 and 443 are just default port numbers.

"replace" function examples

If you look at the function (by typing it's name at the console) you will see that it is just a simple functionalized version of the [<- function which is described at ?"[". [ is a rather basic function to R so you would be well-advised to look at that page for further details. Especially important is learning that the index argument (the second argument in replace can be logical, numeric or character classed values. Recycling will occur when there are differing lengths of the second and third arguments:

You should "read" the function call as" "within the first argument, use the second argument as an index for placing the values of the third argument into the first":

> replace( 1:20, 10:15, 1:2)
 [1]  1  2  3  4  5  6  7  8  9  1  2  1  2  1  2 16 17 18 19 20

Character indexing for a named vector:

> replace(c(a=1, b=2, c=3, d=4), "b", 10)
 a  b  c  d 
 1 10  3  4

Logical indexing:

> replace(x <- c(a=1, b=2, c=3, d=4), x>2, 10)
 a  b  c  d 
 1  2 10 10

Java converting int to hex and back again

int val = -32768;
String hex = Integer.toHexString(val);

int parsedResult = (int) Long.parseLong(hex, 16);
System.out.println(parsedResult);

That's how you can do it.

The reason why it doesn't work your way: Integer.parseInt takes a signed int, while toHexString produces an unsigned result. So if you insert something higher than 0x7FFFFFF, an error will be thrown automatically. If you parse it as long instead, it will still be signed. But when you cast it back to int, it will overflow to the correct value.

Visual Studio keyboard shortcut to display IntelliSense

On Visual Studio Community 7.5.3 on Mac this works for me:

Ctrl + Space

PHP: HTML: send HTML select option attribute in POST

You can use jquery function.

<form name='add'>
   <input type='text' name='stud_name' id="stud_name" value=""/>
   Age: <select name='age' id="age">
   <option value='1' stud_name='sre'>23</option>
   <option value='2' stud_name='sam'>24</option>
   <option value='5' stud_name='john'>25</option>
   </select>
   <input type='submit' name='submit'/>
</form>

jquery code :

<script type="text/javascript" src="jquery.js"></script>

<script>
    $(function() {
          $("#age").change(function(){
          var option = $('option:selected', this).attr('stud_name');
          $('#stud_name').val(option);
       });
    });
</script>

How can I remove the decimal part from JavaScript number?

For an ES6 implementation, use something like the following:

const millisToMinutesAndSeconds = (millis) => {
  const minutes = Math.floor(millis / 60000);
  const seconds = ((millis % 60000) / 1000).toFixed(0);
  return `${minutes}:${seconds < 10 ? '0' : ''}${seconds}`;
}

How to concatenate a std::string and an int?

The std::ostringstream is a good method, but sometimes this additional trick might get handy transforming the formatting to a one-liner:

#include <sstream>
#define MAKE_STRING(tokens) /****************/ \
    static_cast<std::ostringstream&>(          \
        std::ostringstream().flush() << tokens \
    ).str()                                    \
    /**/

Now you can format strings like this:

int main() {
    int i = 123;
    std::string message = MAKE_STRING("i = " << i);
    std::cout << message << std::endl; // prints: "i = 123"
}

Write-Host => Export to a file

How do I use sudo to redirect output to a location I don't have permission to write to?

How about writing a script?

Filename: myscript

#!/bin/sh

/bin/ls -lah /root > /root/test.out

# end script

Then use sudo to run the script:

sudo ./myscript

postgresql COUNT(DISTINCT ...) very slow

If your count(distinct(x)) is significantly slower than count(x) then you can speed up this query by maintaining x value counts in different table, for example table_name_x_counts (x integer not null, x_count int not null), using triggers. But your write performance will suffer and if you update multiple x values in single transaction then you'd need to do this in some explicit order to avoid possible deadlock.

Converting Epoch time into the datetime

This is what you need

In [1]: time.time()
Out[1]: 1347517739.44904

In [2]: time.strftime("%Y-%m-%d %H:%M:%S", time.gmtime(time.time()))
Out[2]: '2012-09-13 06:31:43'

Please input a float instead of an int and that other TypeError should go away.

mend = time.gmtime(float(getbbb_class.end_time)).tm_hour

Full screen background image in an activity

Working. you should tryout this:

android:src="@drawable/img"

Join two data frames, select all columns from one and some columns from the other

I believe that this would be the easiest and most intuitive way:

final = (df1.alias('df1').join(df2.alias('df2'),
                               on = df1['id'] == df2['id'],
                               how = 'inner')
                         .select('df1.*',
                                 'df2.other')
)

AngularJS + JQuery : How to get dynamic content working in angularjs

You need to call $compile on the HTML string before inserting it into the DOM so that angular gets a chance to perform the binding.

In your fiddle, it would look something like this.

$("#dynamicContent").html(
  $compile(
    "<button ng-click='count = count + 1' ng-init='count=0'>Increment</button><span>count: {{count}} </span>"
  )(scope)
);

Obviously, $compile must be injected into your controller for this to work.

Read more in the $compile documentation.

Connection pooling options with JDBC: DBCP vs C3P0

For the auto-reconnect issue with DBCP, has any tried using the following 2 configuration parameters?

validationQuery="Some Query"

testOnBorrow=true

Python: SyntaxError: non-keyword after keyword arg

To really get this clear, here's my for-beginners answer: You inputed the arguments in the wrong order.
A keyword argument has this style:

nullable=True, unique=False

A fixed parameter should be defined: True, False, etc. A non-keyword argument is different:

name="Ricardo", fruit="chontaduro"

This syntax error asks you to first put name="Ricardo" and all of its kind (non-keyword) before those like nullable=True.

python keyword non-keyword syntax-error

How to convert a Bitmap to Drawable in android?

1) bitmap to Drawable :

Drawable mDrawable = new BitmapDrawable(getResources(), bitmap);
// mImageView.setDrawable(mDrawable);

2) drawable to Bitmap :

Bitmap mIcon = BitmapFactory.decodeResource(context.getResources(),R.drawable.icon_resource);
// mImageView.setImageBitmap(mIcon);

Decompile .smali files on an APK

My recommendation is Virtuous Ten Studio. The tool is free but they suggest a donation. It combines all the necessary steps (unpacking APK, baksmaliing, decompiling, etc.) into one easy-to-use UI-based import process. Within five minutes you should have Java source code, less than it takes to figure out the command line options of one of the above mentioned tools.

Decompiling smali to Java is an inexact process, especially if the smali artifacts went through an obfuscator. You can find several decompilers on the web but only some of them are still maintained. Some will give you better decompiled code than others. Read "better" as in "more understandable" than others. Don't expect that the reverse-engineered Java code will compile out of the box. Virtuous Ten Studio comes with multiple free Java decompilers built-in so you can easily try out different decompilers (the "Generate Java source" step) to see which one gives you the best results, saving you the time to find those decompilers yourself and figure out how to use them. Amongst them is CFR, which is one of the few free and still maintained decompilers.

As output you receive, amongst other things, a folder structure that contains all the decompiled Java source code. You can then import this into IntelliJ IDEA or Eclipse for further editing, analysis (e.g. Go to definition, Find usages), etc.

Java ArrayList of Arrays?

This works very well.

ArrayList<String[]> a = new ArrayList<String[]>();
    a.add(new String[3]);
    a.get(0)[0] = "Zubair";
    a.get(0)[1] = "Borkala";
    a.get(0)[2] = "Kerala";
System.out.println(a.get(0)[1]);

Result will be

Borkala

How to check the differences between local and github before the pull

And another useful command to do this (after git fetch) is:

git log origin/master ^master

This shows the commits that are in origin/master but not in master. You can also do it in opposite when doing git pull, to check what commits will be submitted to remote.

Python truncate a long string

       >>> info = lambda data: len(data)>10 and data[:10]+'...' or data
       >>> info('sdfsdfsdfsdfsdfsdfsdfsdfsdfsdfsdf')
           'sdfsdfsdfs...'
       >>> info('sdfsdf')
           'sdfsdf'
       >>>

Zsh: Conda/Pip installs command not found

Open your ~./bashrc
Find the following code (maybe something similar) that launches your conda:


    # >>> conda init >>>
    # !! Contents within this block are managed by 'conda init' !!
    __conda_setup="$(CONDA_REPORT_ERRORS=false '/anaconda3/bin/conda' shell.bash hook 2> /dev/null)" if [ $? -eq 0 ]; then
        \eval "$__conda_setup" else
        if [ -f "/anaconda3/etc/profile.d/conda.sh" ]; then
            . "/anaconda3/etc/profile.d/conda.sh"
            CONDA_CHANGEPS1=false conda activate base
        else
            \export PATH="/anaconda3/bin:$PATH"
        fi fi unset __conda_setup
    # <<< conda init <<<

source ~/.zshrc
Things should work.

Clone only one branch

“--single-branch” switch is your answer, but it only works if you have git version 1.8.X onwards, first check

#git --version

If you already have git version 1.8.X installed then simply use "-b branch and --single branch" to clone a single branch

#git clone -b branch --single-branch git://github/repository.git

By default in Ubuntu 12.04/12.10/13.10 and Debian 7 the default git installation is for version 1.7.x only, where --single-branch is an unknown switch. In that case you need to install newer git first from a non-default ppa as below.

sudo add-apt-repository ppa:pdoes/ppa
sudo apt-get update
sudo apt-get install git
git --version

Once 1.8.X is installed now simply do:

git clone -b branch --single-branch git://github/repository.git

Git will now only download a single branch from the server.

How to have multiple CSS transitions on an element?

It's also possible to avoid specifying the properties altogether.

#box {
  transition: 0.4s;
  position: absolute;
  border: 1px solid darkred;
  bottom: 20px; left: 20px;
  width: 200px; height: 200px;
  opacity: 0;
}

#box.on {
  opacity: 1;
  height: 300px;
  width: 500px;
 }

Reading Xml with XmlReader in C#

    XmlDataDocument xmldoc = new XmlDataDocument();
    XmlNodeList xmlnode ;
    int i = 0;
    string str = null;
    FileStream fs = new FileStream("product.xml", FileMode.Open, FileAccess.Read);
    xmldoc.Load(fs);
    xmlnode = xmldoc.GetElementsByTagName("Product");

You can loop through xmlnode and get the data...... C# XML Reader

What are the best PHP input sanitizing functions?

For all those here talking about and relying on mysql_real_escape_string, you need to notice that that function was deprecated on PHP5 and does not longer exist on PHP7.

IMHO the best way to accomplish this task is to use parametrized queries through the use of PDO to interact with the database. Check this: https://phpdelusions.net/pdo_examples/select

Always use filters to process user input. See http://php.net/manual/es/function.filter-input.php

React Native fixed footer

i created a package. it may meet your needs.

https://github.com/caoyongfeng0214/rn-overlaye

<View style={{paddingBottom:100}}>
     <View> ...... </View>
     <Overlay style={{left:0, right:0, bottom:0}}>
        <View><Text>Footer</Text></View>
     </Overlay>
</View>

Clearing Magento Log Data

you can disable or set date and time for log setting.

System > Configuration > Advanced > System > Log Cleaning

How do I draw a shadow under a UIView?

Simple and clean solution using Interface Builder

Add a file named UIView.swift in your project (or just paste this in any file) :

import UIKit

@IBDesignable extension UIView {

    /* The color of the shadow. Defaults to opaque black. Colors created
    * from patterns are currently NOT supported. Animatable. */
    @IBInspectable var shadowColor: UIColor? {
        set {
            layer.shadowColor = newValue!.CGColor
        }
        get {
            if let color = layer.shadowColor {
                return UIColor(CGColor:color)
            }
            else {
                return nil
            }
        }
    }

    /* The opacity of the shadow. Defaults to 0. Specifying a value outside the
    * [0,1] range will give undefined results. Animatable. */
    @IBInspectable var shadowOpacity: Float {
        set {
            layer.shadowOpacity = newValue
        }
        get {
            return layer.shadowOpacity
        }
    }

    /* The shadow offset. Defaults to (0, -3). Animatable. */
    @IBInspectable var shadowOffset: CGPoint {
        set {
            layer.shadowOffset = CGSize(width: newValue.x, height: newValue.y)
        }
        get {
            return CGPoint(x: layer.shadowOffset.width, y:layer.shadowOffset.height)
        }
    }

    /* The blur radius used to create the shadow. Defaults to 3. Animatable. */
    @IBInspectable var shadowRadius: CGFloat {
        set {
            layer.shadowRadius = newValue
        }
        get {
            return layer.shadowRadius
        }
    }
}

Then this will be available in Interface Builder for every view in the Utilities Panel > Attributes Inspector :

You can easily set the shadow now.

Notes:
- The shadow won't appear in IB, only at runtime.
- As Mazen Kasser said

To those who failed in getting this to work [...] make sure Clip Subviews (clipsToBounds) is not enabled

Explicitly assigning values to a 2D Array?

Creating an iframe with given HTML dynamically

Do this

...
var el = document.getElementById('targetFrame');

var frame_win = getIframeWindow(el);

console.log(frame_win);
...

getIframeWindow is defined here

function getIframeWindow(iframe_object) {
  var doc;

  if (iframe_object.contentWindow) {
    return iframe_object.contentWindow;
  }

  if (iframe_object.window) {
    return iframe_object.window;
  } 

  if (!doc && iframe_object.contentDocument) {
    doc = iframe_object.contentDocument;
  } 

  if (!doc && iframe_object.document) {
    doc = iframe_object.document;
  }

  if (doc && doc.defaultView) {
   return doc.defaultView;
  }

  if (doc && doc.parentWindow) {
    return doc.parentWindow;
  }

  return undefined;
}

Does WhatsApp offer an open API?

WhatsApp does not have a API available for public use. As you put it, it's a closed system.

However, they provide several other ways in which your iPhone application can interact with WhatsApp: through custom URL schemes, share extension and through the Document Interaction API.

See this WhatsApp FAQ article.

Control the size of points in an R scatterplot?

pch=20 returns a symbol sized between "." and 19.

It's a filled symbol (which is probably what you want).

Aside from that, even the base graphics system in R allows a user fine-grained control over symbol size, color, and shape. E.g.,

dfx = data.frame(ev1=1:10, ev2=sample(10:99, 10), ev3=10:1)

with(dfx, symbols(x=ev1, y=ev2, circles=ev3, inches=1/3,
                  ann=F, bg="steelblue2", fg=NULL))

How to increase Bootstrap Modal Width?

n your code, for the modal-dialog div, add another class, modal-lg:

use modal-xl

how to create Socket connection in Android?

Here, in this post you will find the detailed code for establishing socket between devices or between two application in the same mobile.

You have to create two application to test below code.

In both application's manifest file, add below permission

<uses-permission android:name="android.permission.INTERNET" />

1st App code: Client Socket

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TableRow
        android:id="@+id/tr_send_message"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="11dp">

        <EditText
            android:id="@+id/edt_send_message"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginRight="10dp"
            android:layout_marginLeft="10dp"
            android:hint="Enter message"
            android:inputType="text" />

        <Button
            android:id="@+id/btn_send"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="10dp"
            android:text="Send" />
    </TableRow>

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/tr_send_message"
        android:layout_marginTop="25dp"
        android:id="@+id/scrollView2">

        <TextView
            android:id="@+id/tv_reply_from_server"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" />
    </ScrollView>
</RelativeLayout>

MainActivity.java

import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;

/**
 * Created by Girish Bhalerao on 5/4/2017.
 */
public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private TextView mTextViewReplyFromServer;
    private EditText mEditTextSendMessage;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button buttonSend = (Button) findViewById(R.id.btn_send);

        mEditTextSendMessage = (EditText) findViewById(R.id.edt_send_message);
        mTextViewReplyFromServer = (TextView) findViewById(R.id.tv_reply_from_server);

        buttonSend.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {

            case R.id.btn_send:
                sendMessage(mEditTextSendMessage.getText().toString());
                break;
        }
    }

    private void sendMessage(final String msg) {

        final Handler handler = new Handler();
        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {

                try {
                    //Replace below IP with the IP of that device in which server socket open.
                    //If you change port then change the port number in the server side code also.
                    Socket s = new Socket("xxx.xxx.xxx.xxx", 9002);

                    OutputStream out = s.getOutputStream();

                    PrintWriter output = new PrintWriter(out);

                    output.println(msg);
                    output.flush();
                    BufferedReader input = new BufferedReader(new InputStreamReader(s.getInputStream()));
                    final String st = input.readLine();

                    handler.post(new Runnable() {
                        @Override
                        public void run() {

                            String s = mTextViewReplyFromServer.getText().toString();
                            if (st.trim().length() != 0)
                                mTextViewReplyFromServer.setText(s + "\nFrom Server : " + st);
                        }
                    });

                    output.close();
                    out.close();
                    s.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });

        thread.start();
    }
}

2nd App Code - Server Socket

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/btn_stop_receiving"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="STOP Receiving data"
        android:layout_alignParentTop="true"
        android:enabled="false"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="89dp" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/btn_stop_receiving"
        android:layout_marginTop="35dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true">

        <TextView
            android:id="@+id/tv_data_from_client"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" />
    </ScrollView>

    <Button
        android:id="@+id/btn_start_receiving"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="START Receiving data"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="14dp" />
</RelativeLayout>

MainActivity.java

import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * Created by Girish Bhalerao on 5/4/2017.
 */
public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    final Handler handler = new Handler();

    private Button buttonStartReceiving;
    private Button buttonStopReceiving;
    private TextView textViewDataFromClient;
    private boolean end = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        buttonStartReceiving = (Button) findViewById(R.id.btn_start_receiving);
        buttonStopReceiving = (Button) findViewById(R.id.btn_stop_receiving);
        textViewDataFromClient = (TextView) findViewById(R.id.tv_data_from_client);

        buttonStartReceiving.setOnClickListener(this);
        buttonStopReceiving.setOnClickListener(this);

    }

    private void startServerSocket() {

        Thread thread = new Thread(new Runnable() {

            private String stringData = null;

            @Override
            public void run() {

                try {

                    ServerSocket ss = new ServerSocket(9002);

                    while (!end) {
                        //Server is waiting for client here, if needed
                        Socket s = ss.accept();
                        BufferedReader input = new BufferedReader(new InputStreamReader(s.getInputStream()));
                        PrintWriter output = new PrintWriter(s.getOutputStream());

                        stringData = input.readLine();
                        output.println("FROM SERVER - " + stringData.toUpperCase());
                        output.flush();

                        try {
                            Thread.sleep(1000);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        updateUI(stringData);
                        if (stringData.equalsIgnoreCase("STOP")) {
                            end = true;
                            output.close();
                            s.close();
                            break;
                        }

                        output.close();
                        s.close();
                    }
                    ss.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        });
        thread.start();
    }

    private void updateUI(final String stringData) {

        handler.post(new Runnable() {
            @Override
            public void run() {

                String s = textViewDataFromClient.getText().toString();
                if (stringData.trim().length() != 0)
                    textViewDataFromClient.setText(s + "\n" + "From Client : " + stringData);
            }
        });
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {
            case R.id.btn_start_receiving:

                startServerSocket();
                buttonStartReceiving.setEnabled(false);
                buttonStopReceiving.setEnabled(true);
                break;

            case R.id.btn_stop_receiving:

                //stopping server socket logic you can add yourself
                buttonStartReceiving.setEnabled(true);
                buttonStopReceiving.setEnabled(false);
                break;
        }
    }
}

How to delete a remote tag?

If you have a remote tag v0.1.0 to delete, and your remote is origin, then simply:

git push origin :refs/tags/v0.1.0

If you also need to delete the tag locally:

git tag -d v0.1.0

See Adam Franco's answer for an explanation of Git's unusual : syntax for deletion.

What is a regular expression for a MAC Address?

I don't think that the main RegEx is correct as it also classifies

'3D-F2-C9:A6-B3:4F'

as a valid MAC Address, even though it is not correct. The correct one would be:

((([a-zA-z0-9]{2}[-:]){5}([a-zA-z0-9]{2}))|(([a-zA-z0-9]{2}:){5}([a-zA-z0-9]{2})))

So that every time you can choose ':' or '-' for the whole MAC address.

How do I pass command line arguments to a Node.js program?

The up-to-date right answer for this it to use the minimist library. We used to use node-optimist but it has since been deprecated.

Here is an example of how to use it taken straight from the minimist documentation:

var argv = require('minimist')(process.argv.slice(2));
console.dir(argv);

$ node example/parse.js -a beep -b boop
{ _: [], a: 'beep', b: 'boop' }

$ node example/parse.js -x 3 -y 4 -n5 -abc --beep=boop foo bar baz
{ _: [ 'foo', 'bar', 'baz' ],
  x: 3,
  y: 4,
  n: 5,
  a: true,
  b: true,
  c: true,
  beep: 'boop' }

webpack: Module not found: Error: Can't resolve (with relative path)

while importing libraries use the exact path to a file, including the directory relative to the current file, for example:

import Footer from './Footer/index.jsx'
import AddTodo from '../containers/AddTodo/index.jsx'
import VisibleTodoList from '../containers/VisibleTodoList/index.jsx'

Hope this may help

Java error: Implicit super constructor is undefined for default constructor

I had this error and fixed it by removing a thrown exception from beside the method to a try/catch block

For example: FROM:

public static HashMap<String, String> getMap() throws SQLException
{

}

TO:

public static Hashmap<String,String> getMap()
{
  try{

  }catch(SQLException)
  { 
  }
}

Looping through JSON with node.js

My most preferred way is,

var objectKeysArray = Object.keys(yourJsonObj)
objectKeysArray.forEach(function(objKey) {
    var objValue = yourJsonObj[objKey]
})

Use python requests to download CSV

Python3 Supported Code

    with closing(requests.get(PHISHTANK_URL, stream=True})) as r:
        reader = csv.reader(codecs.iterdecode(r.iter_lines(), 'utf-8'), delimiter=',', quotechar='"')
        for record in reader:
           print (record)

How do I remove a library from the arduino environment?

I have found that from version 1.8.4 on, the libraries can be found in ~/Arduino/Libraries. Hope this helps anyone else.

window.location.reload with clear cache

reload() is supposed to accept an argument which tells it to do a hard reload, ie, ignoring the cache:

location.reload(true);

I can't vouch for its reliability, you may want to investigate this further.

How to get a time zone from a location using latitude and longitude coordinates?

Time Zone Location Web Services

Google Maps Time Zone API
Bing Maps Time Zone API
Azure Maps Time Zone API
GeoNames Time Zone API
TimeZoneDB API
AskGeo - commercial (but arguably more accurate than GeoNames)
GeoGarage Time Zone API - commercial, focusing on Nautical time zones.

Raw Time Zone Boundary Data

Timezone Boundary Builder - builds time zone shapefiles from OpenStreetMaps map data. Includes territorial waters near coastlines.

The following projects have previously been sources of time zone boundary data, but are no longer actively maintained.

tz_world - the original shapefile data from Eric Muller
whereonearth-timezone - GeoJSON version with WOEDB data merged in

Time Zone Geolocation Offline Implementations

Implementations that use the Timezone Boundary Builder data

node-geo-tz - JavaScript library (Node.js only)
timespace - JavaScript library
tz-lookup-oss - JavaScript library
GeoTimeZone - .NET library
Geo-Timezone - PHP library
timezonefinder - Python library
ZoneDetect - C library
Timeshape - Java library
TimeZoneMap - Java and Android library
lutz - R library
go-tz - Go library
Timezone lookup - Go library
docker-timezone-lookup - docker container wrapping node-geo-tz

Implementations that use the older tz_world data

latlong - Go library (Read this post also.)
TimeZoneMapper - Java library
tzwhere - JavaScript/Node library
pytzwhere - Python library
timezone_finder - Ruby library
LatLongToTimeZone - Java and Swift libraries
What Time is it here? - Blog post describing PHP and MongoDB
rundel/timezone - R library

Libraries that call one of the web services

timezone - Ruby gem that calls GeoNames
AskGeo has its own libraries for calling from Java or .Net
GeoNames has client libraries for just about everything

Self-hosted web services

geo2tz - based on Timezone lookup, available via Docker image

Other Ideas

Find the nearest city with an R-Tree
Find the nearest city with MySQL

Please update this list if you know of any others

Also, note that the nearest-city approach may not yield the "correct" result, just an approximation.

Conversion To Windows Zones

Most of the methods listed will return an IANA time zone id. If you need to convert to a Windows time zone for use with the TimeZoneInfo class in .NET, use the TimeZoneConverter library.

Don't use zone.tab

The tz database includes a file called zone.tab. This file is primarily used to present a list of time zones for a user to pick from. It includes the latitude and longitude coordinates for the point of reference for each time zone. This allows a map to be created highlighting these points. For example, see the interactive map shown on the moment-timezone home page.

While it may be tempting to use this data to resolve the time zone from a latitude and longitude coordinates, consider that these are points - not boundaries. The best one could do would be to determine the closest point, which in many cases will not be the correct point.

Consider the following example:

Time Zone Example Art

The two squares represent different time zones, where the black dot in each square is the reference location, such as what can be found in zone.tab. The blue dot represents the location we are attempting to find a time zone for. Clearly, this location is within the orange zone on the left, but if we just look at closest distance to the reference point, it will resolve to the greenish zone on the right.

Edit and Continue: "Changes are not allowed when..."

"Edit and Continue", when enabled, will only allow you to edit code when it is in break-mode: e.g. by having the execution paused by an exception or by hitting a breakpoint.

This implies you can't edit the code when the execution isn't paused! When it comes to debugging (ASP.NET) web projects, this is very unintuitive, as you would often want to make changes between requests. At this time, the code your (probably) debugging isn't running, but it isn't paused either!
To solve this, you can click "Break all" (or press Ctrl+Alt+Break). Alternatively, set a breakpoint somewhere (e.g. in your Page_Load event), then reload the page so the execution pauses when it hits the breakpoint, and now you can edit code. Even code in .cs files.

Reading rows from a CSV file in Python

One can do it using pandas library.

Example:

import numpy as np
import pandas as pd

file = r"C:\Users\unknown\Documents\Example.csv"
df1 = pd.read_csv(file)
df1.head()

Random / noise functions for GLSL

A straight, jagged version of 1d Perlin, essentially a random lfo zigzag.

half  rn(float xx){         
    half x0=floor(xx);
    half x1=x0+1;
    half v0 = frac(sin (x0*.014686)*31718.927+x0);
    half v1 = frac(sin (x1*.014686)*31718.927+x1);          

    return (v0*(1-frac(xx))+v1*(frac(xx)))*2-1*sin(xx);
}

I also have found 1-2-3-4d perlin noise on shadertoy owner inigo quilez perlin tutorial website, and voronoi and so forth, he has full fast implementations and codes for them.

Casting a variable using a Type variable

Putting boxing and unboxing aside for simplicity, there's no specific runtime action involved in casting along the inheritance hierarchy. It's mostly a compile time thing. Essentially, a cast tells the compiler to treat the value of the variable as another type.

What you could do after the cast? You don't know the type, so you wouldn't be able to call any methods on it. There wouldn't be any special thing you could do. Specifically, it can be useful only if you know the possible types at compile time, cast it manually and handle each case separately with if statements:

if (type == typeof(int)) {
    int x = (int)obj;
    DoSomethingWithInt(x);
} else if (type == typeof(string)) {
    string s = (string)obj;
    DoSomethingWithString(s);
} // ...

How do I rename a local Git branch?

git branch -m [old-branch] [new-branch]

-m means move all from [old-branch] to [new-branch] and remember you can use -M for other file systems.

invalid_client in google oauth2

I solved my problem with trim :

'google' => [
    'client_id' =>trim('client_id),
    'client_secret' => trim('client_secret'),
    'redirect' => 'http://localhost:8000/login/google/callback',
],

SQL Delete Records within a specific Range

DELETE FROM table_name 
WHERE id BETWEEN 79 AND 296;

Python equivalent of a given wget command

There is also a nice Python module named wget that is pretty easy to use. Found here.

This demonstrates the simplicity of the design:

>>> import wget
>>> url = 'http://www.futurecrew.com/skaven/song_files/mp3/razorback.mp3'
>>> filename = wget.download(url)
100% [................................................] 3841532 / 3841532>
>> filename
'razorback.mp3'

Enjoy.

However, if wget doesn't work (I've had trouble with certain PDF files), try this solution.

Edit: You can also use the out parameter to use a custom output directory instead of current working directory.

>>> output_directory = <directory_name>
>>> filename = wget.download(url, out=output_directory)
>>> filename
'razorback.mp3'

Checking if sys.argv[x] is defined

In the end, the difference between try, except and testing len(sys.argv) isn't all that significant. They're both a bit hackish compared to argparse.

This occurs to me, though -- as a sort of low-budget argparse:

arg_names = ['command', 'x', 'y', 'operation', 'option']
args = dict(zip(arg_names, sys.argv))

You could even use it to generate a namedtuple with values that default to None -- all in four lines!

Arg_list = collections.namedtuple('Arg_list', arg_names)
args = Arg_list(*(args.get(arg, None) for arg in arg_names))

In case you're not familiar with namedtuple, it's just a tuple that acts like an object, allowing you to access its values using tup.attribute syntax instead of tup[0] syntax.

So the first line creates a new namedtuple type with values for each of the values in arg_names. The second line passes the values from the args dictionary, using get to return a default value when the given argument name doesn't have an associated value in the dictionary.

What is the difference between DTR/DSR and RTS/CTS flow control?

DTR - Data Terminal Ready
DSR - Data Set Ready
RTS - Request To Send
CTS - Clear To Send

There are multiple ways of doing things because there were never any protocols built into the standards. You use whatever ad-hoc "standard" your equipment implements.

Just based on the names, RTS/CTS would seem to be a natural fit. However, it's backwards from the needs that developed over time. These signals were created at a time when a terminal would batch-send a screen full of data, but the receiver might not be ready, thus the need for flow control. Later the problem would be reversed, as the terminal couldn't keep up with data coming from the host, but the RTS/CTS signals go the wrong direction - the interface isn't orthogonal, and there's no corresponding signals going the other way. Equipment makers adapted as best they could, including using the DTR and DSR signals.

EDIT

To add a bit more detail, its a two level hierarchy so "officially" both must happen for communication to take place. The behavior is defined in the original CCITT (now ITU-T) standard V.28.

The DCE is a modem connecting between the terminal and telephone network. In the telephone network was another piece of equipment which split off to the data network, eg. X.25.

The modem has three states: Powered off, Ready (Data Set Ready is true), and connected (Data Carrier Detect)

The terminal can't do anything until the modem is connected.

When the modem wants to send data, it raises RTS and the modem grants the request with CTS. The modem lowers CTS when its internal buffer is full.

So nostalgic!

Sum values from multiple rows using vlookup or index/match functions

You should use Ctrl+shift+enter when using the =SUM(VLOOKUP(A9,A1:D5,{2,3,4,},FALSE)) that results in {=SUM(VLOOKUP(A9,A1:D5,{2,3,4,},FALSE))} en also works.

How do I clear my local working directory in Git?

Use:

git clean -df

It's not well advertised, but git clean is really handy. Git Ready has a nice introduction to git clean.

Adding images to an HTML document with javascript

You need to use document.getElementById() in line 3.

If you try this right now in the console:

_x000D_

var img = document.createElement("img");_x000D_
img.src = "http://www.google.com/intl/en_com/images/logo_plain.png";_x000D_
var src = document.getElementById("header");_x000D_
src.appendChild(img);

_x000D_

<div id="header"></div>

_x000D_

... you'd get this:

How to pass a function as a parameter in Java?

Java does not (yet) support closures. But there are other languages like Scala and Groovy which run in the JVM and do support closures.

java.net.BindException: Address already in use: JVM_Bind <null>:80

Setting Tomcat to listen to port 80 is WRONG , for development the 8080 is a good port to use. For production use, just set up an apache that shall forward your requests to your tomcat. Here is a how to.

An unhandled exception of type 'System.TypeInitializationException' occurred in EntityFramework.dll

Read the message:

Only one <configSections> element allowed per config file and if present must be the first child of the root <configuration> element.

Move the configSections element to the top - just above where system.data is currently.

Random date in C#

Start with a fixed date object (Jan 1, 1995), and add a random number of days with AddDays (obviusly, pay attention not surpassing the current date).

Array of Matrices in MATLAB

If all of the matrices are going to be the same size (i.e. 500x800), then you can just make a 3D array:

nUnknown;  % The number of unknown arrays
myArray = zeros(500,800,nUnknown);

To access one array, you would use the following syntax:

subMatrix = myArray(:,:,3);  % Gets the third matrix

You can add more matrices to myArray in a couple of ways:

myArray = cat(3,myArray,zeros(500,800));
% OR
myArray(:,:,nUnknown+1) = zeros(500,800);

If each matrix is not going to be the same size, you would need to use cell arrays like Hosam suggested.

EDIT: I missed the part about running out of memory. I'm guessing your nUnknown is fairly large. You may have to switch the data type of the matrices (single or even a uintXX type if you are using integers). You can do this in the call to zeros:

myArray = zeros(500,800,nUnknown,'single');

How do you print in a Go test using the "testing" package?

The *_test.go file is a Go source like the others, you can initialize a new logger every time if you need to dump complex data structure, here an example:

// initZapLog is delegated to initialize a new 'log manager'
func initZapLog() *zap.Logger {
    config := zap.NewDevelopmentConfig()
    config.EncoderConfig.EncodeLevel = zapcore.CapitalColorLevelEncoder
    config.EncoderConfig.TimeKey = "timestamp"
    config.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
    logger, _ := config.Build()
    return logger
}

Then, every time, in every test:

func TestCreateDB(t *testing.T) {
    loggerMgr := initZapLog()
    // Make logger avaible everywhere
    zap.ReplaceGlobals(loggerMgr)
    defer loggerMgr.Sync() // flushes buffer, if any
    logger := loggerMgr.Sugar()
    logger.Debug("START")
    conf := initConf()
    /* Your test here
    if false {
        t.Fail()
    }*/
}

Python JSON serialize a Decimal object

I tried switching from simplejson to builtin json for GAE 2.7, and had issues with the decimal. If default returned str(o) there were quotes (because _iterencode calls _iterencode on the results of default), and float(o) would remove trailing 0.

If default returns an object of a class that inherits from float (or anything that calls repr without additional formatting) and has a custom __repr__ method, it seems to work like I want it to.

import json
from decimal import Decimal

class fakefloat(float):
    def __init__(self, value):
        self._value = value
    def __repr__(self):
        return str(self._value)

def defaultencode(o):
    if isinstance(o, Decimal):
        # Subclass float with custom repr?
        return fakefloat(o)
    raise TypeError(repr(o) + " is not JSON serializable")

json.dumps([10.20, "10.20", Decimal('10.20')], default=defaultencode)
'[10.2, "10.20", 10.20]'

How to get input text value on click in ReactJS

There are two ways to go about doing this.

Create a state in the constructor that contains the text input. Attach an onChange event to the input box that updates state each time. Then onClick you could just alert the state object.
handleClick: function() { alert(this.refs.myInput.value); },

vim - How to delete a large block of text without counting the lines?

You can also enter a very large number, and then press dd if you wish to delete all the lines below the cursor.

How can I flush GPU memory using CUDA (physical reset is unavailable)

on macOS (/ OS X), if someone else is having trouble with the OS apparently leaking memory:

https://github.com/phvu/cuda-smi is useful for quickly checking free memory
Quitting applications seems to free the memory they use. Quit everything you don't need, or quit applications one-by-one to see how much memory they used.
If that doesn't cut it (quitting about 10 applications freed about 500MB / 15% for me), the biggest consumer by far is WindowServer. You can Force quit it, which will also kill all applications you have running and log you out. But it's a bit faster than a restart and got me back to 90% free memory on the cuda device.

How to use not contains() in xpath?

Should be xpath with not contains() method, //production[not(contains(category,'business'))]

Nginx upstream prematurely closed connection while reading response header from upstream, for large requests

I meet the same problem and no one of the solutions detailed here worked for me ... First of all I had an error 413 Entity too large so I updated my nginx.conf as following :

http {
        # Increase request size
        client_max_body_size 10m;

        ##
        # Basic Settings
        ##

        sendfile on;
        tcp_nopush on;
        tcp_nodelay on;
        keepalive_timeout 65;
        types_hash_max_size 2048;
        # server_tokens off;

        # server_names_hash_bucket_size 64;
        # server_name_in_redirect off;

        include /etc/nginx/mime.types;
        default_type application/octet-stream;

        ##
        # SSL Settings
        ##

        ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
        ssl_prefer_server_ciphers on;

        ##
        # Logging Settings
        ##

        access_log /var/log/nginx/access.log;
        error_log /var/log/nginx/error.log;

        ##
        # Gzip Settings
        ##

        gzip on;

        # gzip_vary on;
        # gzip_proxied any;
        # gzip_comp_level 6;
        # gzip_buffers 16 8k;
        # gzip_http_version 1.1;
        # gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

        ##
        # Virtual Host Configs
        ##

        include /etc/nginx/conf.d/*.conf;
        include /etc/nginx/sites-enabled/*;

        ##
        # Proxy settings
        ##
        proxy_connect_timeout 1000;
        proxy_send_timeout 1000;
        proxy_read_timeout 1000;
        send_timeout 1000;
}

So I only updated the http part, and now I meet the error 502 Bad Gateway and when I display /var/log/nginx/error.log I got the famous "upstream prematurely closed connection while reading response header from upstream"

What is really mysterious for me is that the request works when I run it with virtualenv on my server and send the request to the : IP:8000/nameOfTheRequest

Thanks for reading

Can inner classes access private variables?

Anything that is part of Outer should have access to all of Outer's members, public or private.

Edit: your compiler is correct, var is not a member of Inner. But if you have a reference or pointer to an instance of Outer, it could access that.

How to get DATE from DATETIME Column in SQL?

Try this:

SELECT SUM(transaction_amount) FROM TransactionMaster WHERE Card_No ='123' AND CONVERT(VARCHAR(10),GETDATE(),111)

The GETDATE() function returns the current date and time from the SQL Server.

Tri-state Check box in HTML?

Here other Example with simple jQuery and property data-checked:

_x000D_

 $("#checkbox")_x000D_
  .click(function(e) {_x000D_
    var el = $(this);_x000D_
_x000D_
    switch (el.data('checked')) {_x000D_
_x000D_
      // unchecked, going indeterminate_x000D_
      case 0:_x000D_
        el.data('checked', 1);_x000D_
        el.prop('indeterminate', true);_x000D_
        break;_x000D_
_x000D_
        // indeterminate, going checked_x000D_
      case 1:_x000D_
        el.data('checked', 2);_x000D_
        el.prop('indeterminate', false);_x000D_
        el.prop('checked', true);_x000D_
        break;_x000D_
_x000D_
        // checked, going unchecked_x000D_
      default:_x000D_
        el.data('checked', 0);_x000D_
        el.prop('indeterminate', false);_x000D_
        el.prop('checked', false);_x000D_
_x000D_
    }_x000D_
  });

_x000D_

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>_x000D_
<label><input type="checkbox" name="checkbox" value="" checked id="checkbox"> Tri-State Checkbox </label>

_x000D_

Which tool to build a simple web front-end to my database

I think PHP is a good solution. It's simple to set up, free and there is plenty of documentation on how to create a database management app. Ruby on Rails is faster to code but a bit more difficult to set up.

Can I have an onclick effect in CSS?

You can use pseudo class :target to mimic on click event, let me give you an example.

_x000D_

#something {_x000D_
  display: none;_x000D_
}_x000D_
_x000D_
#something:target {_x000D_
  display: block;_x000D_
}

_x000D_

<a href="#something">Show</a>_x000D_
<div id="something">Bingo!</div>

_x000D_

Here's how it looks like: http://jsfiddle.net/TYhnb/

One thing to note, this is only limited to hyperlink, so if you need to use on other than hyperlink, such as a button, you might want to hack it a little bit, such as styling a hyperlink to look like a button.

How to convert a string to integer in C?

Don't use functions from ato... group. These are broken and virtually useless. A moderately better solution would be to use sscanf, although it is not perfect either.

To convert string to integer, functions from strto... group should be used. In your specific case it would be strtol function.

jQuery - select all text from a textarea

$('textarea').focus(function() {
    this.select();
}).mouseup(function() {
    return false;
});

Java HTML Parsing

The main problem as stated by preceding coments is malformed HTML, so an html cleaner or HTML-XML converter is a must. Once you get the XML code (XHTML) there are plenty of tools to handle it. You could get it with a simple SAX handler that extracts only the data you need or any tree-based method (DOM, JDOM, etc.) that let you even modify original code.

Here is a sample code that uses HTML cleaner to get all DIVs that use a certain class and print out all Text content inside it.

import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.htmlcleaner.HtmlCleaner;
import org.htmlcleaner.TagNode;

/**
 * @author Fernando Miguélez Palomo <fernandoDOTmiguelezATgmailDOTcom>
 */
public class TestHtmlParse
{
    static final String className = "tags";
    static final String url = "http://www.stackoverflow.com";

    TagNode rootNode;

    public TestHtmlParse(URL htmlPage) throws IOException
    {
        HtmlCleaner cleaner = new HtmlCleaner();
        rootNode = cleaner.clean(htmlPage);
    }

    List getDivsByClass(String CSSClassname)
    {
        List divList = new ArrayList();

        TagNode divElements[] = rootNode.getElementsByName("div", true);
        for (int i = 0; divElements != null && i < divElements.length; i++)
        {
            String classType = divElements[i].getAttributeByName("class");
            if (classType != null && classType.equals(CSSClassname))
            {
                divList.add(divElements[i]);
            }
        }

        return divList;
    }

    public static void main(String[] args)
    {
        try
        {
            TestHtmlParse thp = new TestHtmlParse(new URL(url));

            List divs = thp.getDivsByClass(className);
            System.out.println("*** Text of DIVs with class '"+className+"' at '"+url+"' ***");
            for (Iterator iterator = divs.iterator(); iterator.hasNext();)
            {
                TagNode divElement = (TagNode) iterator.next();
                System.out.println("Text child nodes of DIV: " + divElement.getText().toString());
            }
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
}

Check if a given time lies between two times regardless of date

After reading a few replies, I feel the writing is too complicated. Try my code

 public static boolean compare(String system_time, String currentTime, String endtimes) {
    try {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("HH:mm:ss");

        Date startime = simpleDateFormat.parse("19:25:00");
        Date endtime = simpleDateFormat.parse("20:30:00");

        //current time
        Date current_time = simpleDateFormat.parse("20:00:00");

    if (current_time.after(startime) && current_time.before(endtime)) {
            System.out.println("Yes");
            return true;
      }
    else if (current_time.after(startime) && current_time.after(endtime)) {
         return true; //overlap condition check
      }
     else {
            System.out.println("No");
            return false;
        }
    } catch (ParseException e) {
        e.printStackTrace();
    }
    return false;
 }

Difference between RUN and CMD in a Dockerfile

There has been enough answers on RUN and CMD. I just want to add a few words on ENTRYPOINT. CMD arguments can be overwritten by command line arguments, while ENTRYPOINT arguments are always used.

This article is a good source of information.

How to export private key from a keystore of self-signed certificate

http://anandsekar.github.io/exporting-the-private-key-from-a-jks-keystore/

public class ExportPrivateKey {
        private File keystoreFile;
        private String keyStoreType;
        private char[] password;
        private String alias;
        private File exportedFile;

        public static KeyPair getPrivateKey(KeyStore keystore, String alias, char[] password) {
                try {
                        Key key=keystore.getKey(alias,password);
                        if(key instanceof PrivateKey) {
                                Certificate cert=keystore.getCertificate(alias);
                                PublicKey publicKey=cert.getPublicKey();
                                return new KeyPair(publicKey,(PrivateKey)key);
                        }
                } catch (UnrecoverableKeyException e) {
        } catch (NoSuchAlgorithmException e) {
        } catch (KeyStoreException e) {
        }
        return null;
        }

        public void export() throws Exception{
                KeyStore keystore=KeyStore.getInstance(keyStoreType);
                BASE64Encoder encoder=new BASE64Encoder();
                keystore.load(new FileInputStream(keystoreFile),password);
                KeyPair keyPair=getPrivateKey(keystore,alias,password);
                PrivateKey privateKey=keyPair.getPrivate();
                String encoded=encoder.encode(privateKey.getEncoded());
                FileWriter fw=new FileWriter(exportedFile);
                fw.write(“—–BEGIN PRIVATE KEY—–\n“);
                fw.write(encoded);
                fw.write(“\n“);
                fw.write(“—–END PRIVATE KEY—–”);
                fw.close();
        }


        public static void main(String args[]) throws Exception{
                ExportPrivateKey export=new ExportPrivateKey();
                export.keystoreFile=new File(args[0]);
                export.keyStoreType=args[1];
                export.password=args[2].toCharArray();
                export.alias=args[3];
                export.exportedFile=new File(args[4]);
                export.export();
        }
}

How to use npm with ASP.NET Core

Shawn Wildermuth has a nice guide here: https://wildermuth.com/2017/11/19/ASP-NET-Core-2-0-and-the-End-of-Bower

The article links to the gulpfile on GitHub where he's implemented the strategy in the article. You could just copy and paste most of the gulpfile contents into yours, but be sure to add the appropriate packages in package.json under devDependencies: gulp gulp-uglify gulp-concat rimraf merge-stream

Convert InputStream to byte array in Java

See the InputStream.available() documentation:

It is particularly important to realize that you must not use this method to size a container and assume that you can read the entirety of the stream without needing to resize the container. Such callers should probably write everything they read to a ByteArrayOutputStream and convert that to a byte array. Alternatively, if you're reading from a file, File.length returns the current length of the file (though assuming the file's length can't change may be incorrect, reading a file is inherently racy).

Bash script to calculate time elapsed

try using time with the elapsed seconds option:

/usr/bin/time -f%e sleep 1 under bash.

or \time -f%e sleep 1 in interactive bash.

see the time man page:

Users of the bash shell need to use an explicit path in order to run the external time command and not the shell builtin variant. On system where time is installed in /usr/bin, the first example would become /usr/bin/time wc /etc/hosts

and

FORMATTING THE OUTPUT
...
    %      A literal '%'.
    e      Elapsed  real  (wall  clock) time used by the process, in
                 seconds.

How to remove an element slowly with jQuery?

$('#ur_id').slideUp("slow", function() { $('#ur_id').remove();});

Run Button is Disabled in Android Studio

It was quite silly for me, I just opened the Run > Run Configurations window everything seemed to be fine there, I didn't change anything, when I closed the window the button was enabled.

AngularJS format JSON string output

In addition to the angular json filter already mentioned, there is also the angular toJson() function.

angular.toJson(obj, pretty);

The second param of this function lets you switch on pretty printing and set the number of spaces to use.

If set to true, the JSON output will contain newlines and whitespace. If set to an integer, the JSON output will contain that many spaces per indentation.

(default: 2)

Regex credit card number tests

Android Studio Rendering Problems : The following classes could not be found

To use the class ActionBarOverlayLayout you need to include this in the dependencies section of build.gradle file:

compile 'com.android.support:design:24.1.1'

Sync the project once again and then you will find no problem

Convert HTML Character Back to Text Using Java Standard Library

As @jem suggested, it is possible to use jsoup.

With jSoup 1.8.3 it il possible to use the method Parser.unescapeEntities that retain the original html.

import org.jsoup.parser.Parser;
...
String html = Parser.unescapeEntities(original_html, false);

It seems that in some previous release this method is not present.

The following untracked working tree files would be overwritten by merge, but I don't care

Update - a better version

This tool (https://github.com/mklepaczewski/git-clean-before-merge) will:

delete untracked files that are identical to their git pull equivalents,
revert changes to modified files who's modified version is identical to their git pull equivalents,
report modified/untracked files that differ from their git pull version,
the tool has the --pretend option that will not modify any files.

Old version

How this answer differ from other answers?

The method presented here removes only files that would be overwritten by merge. If you have other untracked (possibly ignored) files in the directory this method won't remove them.

The solution

This snippet will extract all untracked files that would be overwritten by git pull and delete them.

git pull 2>&1|grep -E '^\s'|cut -f2-|xargs -I {} rm -rf "{}"

and then just do:

git pull

This is not git porcelain command so always double check what it would do with:

git pull 2>&1|grep -E '^\s'|cut -f2-|xargs -I {} echo "{}"

Explanation - because one liners are scary:

Here's a breakdown of what it does:

git pull 2>&1 - capture git pull output and redirect it all to stdout so we can easily capture it with grep.
grep -E '^\s - the intent is to capture the list of the untracked files that would be overwritten by git pull. The filenames have a bunch of whitespace characters in front of them so we utilize it to get them.
cut -f2- - remove whitespace from the beginning of each line captured in 2.
xargs -I {} rm -rf "{}" - us xargs to iterate over all files, save their name in "{}" and call rm for each of them. We use -rf to force delete and remove untracked directories.

It would be great to replace steps 1-3 with porcelain command, but I'm not aware of any equivalent.

Parse rfc3339 date strings in Python?

You can use dateutil.parser.parse (install with python -m pip install python-dateutil) to parse strings into datetime objects.

dateutil.parser.parse will attempt to guess the format of your string, if you know the exact format in advance then you can use datetime.strptime which you supply a format string to (see Brent Washburne's answer).

from dateutil.parser import parse

a = "2012-10-09T19:00:55Z"

b = parse(a)

print(b.weekday())
# 1 (equal to a Tuesday)

Can I escape a double quote in a verbatim string literal?

Use a duplicated double quote.

@"this ""word"" is escaped";

outputs:

this "word" is escaped

How to do multiline shell script in Ansible

Adding a space before the EOF delimiter allows to avoid cmd:

- shell: |
    cat <<' EOF'
    This is a test.
    EOF

Git: which is the default configured remote for branch?

You can do it more simply, guaranteeing that your .gitconfig is left in a meaningful state:

Using Git version v1.8.0 and above

git push -u hub master when pushing, or:
git branch -u hub/master

OR

(This will set the remote for the currently checked-out branch to hub/master)
git branch --set-upstream-to hub/master

OR

(This will set the remote for the branch named branch_name to hub/master)
git branch branch_name --set-upstream-to hub/master

If you're using `v1.7.x` or earlier

you must use --set-upstream:
git branch --set-upstream master hub/master

HTML: Is it possible to have a FORM tag in each TABLE ROW in a XHTML valid way?

Im late to the party, but this worked great for me and the code should explain itself;

<script type="text/javascript">
    function formAJAX(btn){
        var $form = $(btn).closest('[action]');
        var str = $form.find('[name]').serialize();
        $.post($form.attr('action'), str, function(data){
            //do stuff
        });
    }
<script>

HTML:

<tr action="scriptURL.php">
    <td>
        Field 1:<input type="text" name="field1"/>
    </td>
    <td>
        Field 2:<input type="text" name="field2" />
    </td>
    <td><button type="button" onclick="formAJAX(this)">Update</button></td>
</tr>

Sys is undefined

I solved this problem by creating separate asp.net ajax solution and copy and paste all ajax configuration from web.config to working project.

here are the must configuration you should set in web.config

    <configuration>
<configSections>
    <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
        <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
            <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication"/>
</sectionGroup>

    </sectionGroup>
</configSections>

        <assemblies>

            <add assembly="System.Web.Extensions,     Version=1.0.61025.0,       Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

        </assemblies>
           </compilation>
        <httpHandlers>
        <remove verb="*" path="*.asmx"/>
        <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
        <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
        <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false"/>
    </httpHandlers>
    <httpModules>
        <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
    </httpModules>
</system.web>
    <system.webServer>
    <validation validateIntegratedModeConfiguration="false"/>
    <modules>
        <add name="ScriptModule" preCondition="integratedMode" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
    </modules>
    <handlers>
        <remove name="WebServiceHandlerFactory-Integrated"/>
        <add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
        <add name="ScriptHandlerFactoryAppServices" verb="*" path="*_AppService.axd" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
        <add name="ScriptResource" preCondition="integratedMode" verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
    </handlers>
</system.webServer>

How to remove pip package after deleting it manually

I met the same issue while experimenting with my own Python library and what I've found out is that pip freeze will show you the library as installed if your current directory contains lib.egg-info folder. And pip uninstall <lib> will give you the same error message.

Make sure your current directory doesn't have any egg-info folders
Check pip show <lib-name> to see the details about the location of the library, so you can remove files manually.

How to check if array element is null to avoid NullPointerException in Java

The given code works for me. Notice that someArray[i] is always null since you have not initialized the second dimension of the array.

How to change maven java home

I am using Mac and none of the answers above helped me. I found out that maven loads its own JAVA_HOME from the path specified in: ~/.mavenrc

I changed the content of the file to be: JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home

For Linux it will look something like:
JAVA_HOME=/usr/lib/jvm/java-8-oracle/jre

Disable HttpClient logging

I was also having the same problem. The entire console was filled with [main] DEBUG org.apache.http.wire while running the tests.

The solution which worked for me was creating a logback-test.xml src/test/resources/logback-test.xml as in https://github.com/bonigarcia/webdrivermanager-examples/blob/master/src/test/resources/logback-test.xml (ref - https://github.com/bonigarcia/webdrivermanager/issues/203)

To view my logging infos, I replaced logger name="io.github.bonigarcia" with my package name

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>

    <logger name="com.mypackage" level="DEBUG" />
    <logger name="org" level="INFO" />
    <logger name="com" level="INFO" />

    <root level="INFO">
        <appender-ref ref="STDOUT" />
    </root>

</configuration>

How to implement if-else statement in XSLT?

Originally from this blog post. We can achieve if else by using below code

<xsl:choose>
    <xsl:when test="something to test">

    </xsl:when>
    <xsl:otherwise>

    </xsl:otherwise>
</xsl:choose>

So here is what I did

<h3>System</h3>
    <xsl:choose>
        <xsl:when test="autoIncludeSystem/autoincludesystem_info/@mdate"> <!-- if attribute exists-->
            <p>
                <dd><table border="1">
                    <tbody>
                        <tr>
                            <th>File Name</th>
                            <th>File Size</th>
                            <th>Date</th>
                            <th>Time</th>
                            <th>AM/PM</th>
                        </tr>
                        <xsl:for-each select="autoIncludeSystem/autoincludesystem_info">
                            <tr>
                                <td valign="top" ><xsl:value-of select="@filename"/></td>
                                <td valign="top" ><xsl:value-of select="@filesize"/></td>
                                <td valign="top" ><xsl:value-of select="@mdate"/></td>
                                <td valign="top" ><xsl:value-of select="@mtime"/></td>
                                <td valign="top" ><xsl:value-of select="@ampm"/></td>
                            </tr>
                        </xsl:for-each>
                    </tbody>
                </table>
                </dd>
            </p>
        </xsl:when>
        <xsl:otherwise> <!-- if attribute does not exists -->
            <dd><pre>
                <xsl:value-of select="autoIncludeSystem"/><br/>
            </pre></dd> <br/>
        </xsl:otherwise>
    </xsl:choose>

My Output

enter image description here

Cannot assign requested address using ServerSocket.socketBind

It may be related to a misconfiguration in your /etc/hosts. In my case, it was like this: 192.168.1.11 localhost instead of 127.0.0.1 localhost

MVC4 Passing model from view to controller

I hope this complete example will help you.

This is the TaxiInfo class which holds information about a taxi ride:

namespace Taxi.Models
{
    public class TaxiInfo
    {
        public String Driver { get; set; }
        public Double Fare { get; set; }
        public Double Distance { get; set; }
        public String StartLocation { get; set; }
        public String EndLocation { get; set; }
    }
}

We also have a convenience model which holds a List of TaxiInfo(s):

namespace Taxi.Models
{
    public class TaxiInfoSet
    {
        public List<TaxiInfo> TaxiInfoList { get; set; }

        public TaxiInfoSet(params TaxiInfo[] TaxiInfos)
        {
            TaxiInfoList = new List<TaxiInfo>();

            foreach(var TaxiInfo in TaxiInfos)
            {
                TaxiInfoList.Add(TaxiInfo);
            }
        }
    }
}

Now in the home controller we have the default Index action which for this example makes two taxi drivers and adds them to the list contained in a TaxiInfo:

public ActionResult Index()
{
    var taxi1 = new TaxiInfo() { Fare = 20.2, Distance = 15, Driver = "Billy", StartLocation = "Perth", EndLocation = "Brisbane" };
    var taxi2 = new TaxiInfo() { Fare = 2339.2, Distance = 1500, Driver = "Smith", StartLocation = "Perth", EndLocation = "America" };

    return View(new TaxiInfoSet(taxi1,taxi2));
}

The code for the view is as follows:

@model Taxi.Models.TaxiInfoSet
@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>

@foreach(var TaxiInfo in Model.TaxiInfoList){
    <form>
        <h1>Cost: [email protected]</h1>
        <h2>Distance: @(TaxiInfo.Distance) km</h2>
        <p>
            Our diver, @TaxiInfo.Driver will take you from @TaxiInfo.StartLocation to @TaxiInfo.EndLocation
        </p>
        @Html.ActionLink("Home","Booking",TaxiInfo)
    </form>
}

The ActionLink is responsible for the re-directing to the booking action of the Home controller (and passing in the appropriate TaxiInfo object) which is defiend as follows:

    public ActionResult Booking(TaxiInfo Taxi)
    {
        return View(Taxi);
    }

This returns a the following view:

@model Taxi.Models.TaxiInfo

@{
    ViewBag.Title = "Booking";
}

<h2>Booking For</h2>
<h1>@Model.Driver, going from @Model.StartLocation to @Model.EndLocation (a total of @Model.Distance km) for [email protected]</h1>

A visual tour:

The Index view

The Booking view

How do I get the command-line for an Eclipse run configuration?

I found a solution on Stack Overflow for Java program run configurations which also works for JUnit run configurations.

You can get the full command executed by your configuration on the Debug tab, or more specifically the Debug view.

Run your application

Go to your Debug perspective

There should be an entry in there (in the Debug View) for the app you've just executed

Right-click the node which references java.exe or javaw.exe and select Properties In the dialog that pops up you'll see the Command Line which includes all jars, parameters, etc

How to create/make rounded corner buttons in WPF?

As alternative, you can code something like this:

    <Border 
            x:Name="borderBtnAdd"
            BorderThickness="1" 
            BorderBrush="DarkGray" 
            CornerRadius="360" 
            Height="30" 
            Margin="0,10,10,0" 
            VerticalAlignment="Top" HorizontalAlignment="Right" Width="30">
        <Image x:Name="btnAdd"
               Source="Recursos/Images/ic_add_circle_outline_black_24dp_2x.png"
               Width="{Binding borderBtnAdd.Width}" Height="{Binding borderBtnAdd.Height}"/>
    </Border>

The "Button" will look something like this:

You could set any other content instead of the image.

How to get the android Path string to a file on Assets folder?

Have a look at the ReadAsset.java from API samples that come with the SDK.

       try {
        InputStream is = getAssets().open("read_asset.txt");

        // We guarantee that the available method returns the total
        // size of the asset...  of course, this does mean that a single
        // asset can't be more than 2 gigs.
        int size = is.available();

        // Read the entire asset into a local byte buffer.
        byte[] buffer = new byte[size];
        is.read(buffer);
        is.close();

        // Convert the buffer into a string.
        String text = new String(buffer);

        // Finally stick the string into the text view.
        TextView tv = (TextView)findViewById(R.id.text);
        tv.setText(text);
    } catch (IOException e) {
        // Should never happen!
        throw new RuntimeException(e);
    }

Can I pass an argument to a VBScript (vbs file launched with cscript)?

You can use WScript.Arguments to access the arguments passed to your script.

Calling the script:

cscript.exe test.vbs "C:\temp\"

Inside your script:

Set File = FSO.OpenTextFile(WScript.Arguments(0) &"\test.txt", 2, True)

Don't forget to check if there actually has been an argument passed to your script. You can do so by checking the Count property:

if WScript.Arguments.Count = 0 then
    WScript.Echo "Missing parameters"
end if

If your script is over after you close the file then there is no need to set the variables to Nothing. The resources will be cleaned up automatically when the cscript.exe process terminates. Setting a variable to Nothing usually is only necessary if you explicitly want to free resources during the execution of your script. In that case, you would set variables which contain a reference to a COM object to Nothing, which would release the COM object before your script terminates. This is just a short answer to your bonus question, you will find more information in these related questions:

Is there a need to set Objects to Nothing inside VBA Functions

When must I set a variable to “Nothing” in VB6?

JPA Hibernate One-to-One relationship

Try this

@Entity

@Table(name="tblperson")

public class Person {

public int id;

public OtherInfo otherInfo;
@Id //Here Id is autogenerated
@Column(name="id")
@GeneratedValue(strategy=GenerationType.AUTO)
public int getId() {
    return id;
}
public void setId(int id) {
    this.id = id;
}

@OneToOne(cascade = CascadeType.ALL,targetEntity=OtherInfo.class)
@JoinColumn(name="otherInfo_id") //there should be a column otherInfo_id in Person
public OtherInfo getOtherInfo() {
    return otherInfo;
}
public void setOtherInfo(OtherInfo otherInfo) {
    this.otherInfo= otherInfo;
}
rest of attributes ...
}


@Entity

@Table(name="tblotherInfo")

public class OtherInfo {

private int id;

private Person person;

@Id

@Column(name="id")
@GeneratedValue(strategy=GenerationType.AUTO)
public Long getId() {
    return id;
}
public void setId(Long id) {
    this.id = id;
}

  @OneToOne(mappedBy="OtherInfo",targetEntity=Person.class)   
public College getPerson() {
    return person;
}
public void setPerson(Person person) {
    this.person = person;
}    
 rest of attributes ...
}

How to set full calendar to a specific start date when it's initialized for the 1st time?

You have it backwards. Display the calendar first, and then call gotoDate.

$('#calendar').fullCalendar({
  // Options
});

$('#calendar').fullCalendar('gotoDate', currentDate);

BeautifulSoup getting href

You can use find_all in the following way to find every a element that has an href attribute, and print each one:

from BeautifulSoup import BeautifulSoup

html = '''<a href="some_url">next</a>
<span class="class"><a href="another_url">later</a></span>'''

soup = BeautifulSoup(html)

for a in soup.find_all('a', href=True):
    print "Found the URL:", a['href']

The output would be:

Found the URL: some_url
Found the URL: another_url

Note that if you're using an older version of BeautifulSoup (before version 4) the name of this method is findAll. In version 4, BeautifulSoup's method names were changed to be PEP 8 compliant, so you should use find_all instead.

If you want all tags with an href, you can omit the name parameter:

href_tags = soup.find_all(href=True)

javascript regex - look behind alternative?

Below is a positive lookbehind JavaScript alternative showing how to capture the last name of people with 'Michael' as their first name.

1) Given this text:

const exampleText = "Michael, how are you? - Cool, how is John Williamns and Michael Jordan? I don't know but Michael Johnson is fine. Michael do you still score points with LeBron James, Michael Green Miller and Michael Wood?";

get an array of last names of people named Michael. The result should be: ["Jordan","Johnson","Green","Wood"]

2) Solution:

function getMichaelLastName2(text) {
  return text
    .match(/(?:Michael )([A-Z][a-z]+)/g)
    .map(person => person.slice(person.indexOf(' ')+1));
}

// or even
    .map(person => person.slice(8)); // since we know the length of "Michael "

3) Check solution

console.log(JSON.stringify(    getMichaelLastName(exampleText)    ));
// ["Jordan","Johnson","Green","Wood"]

Demo here: http://codepen.io/PiotrBerebecki/pen/GjwRoo

You can also try it out by running the snippet below.

_x000D_

const inputText = "Michael, how are you? - Cool, how is John Williamns and Michael Jordan? I don't know but Michael Johnson is fine. Michael do you still score points with LeBron James, Michael Green Miller and Michael Wood?";_x000D_
_x000D_
_x000D_
_x000D_
function getMichaelLastName(text) {_x000D_
  return text_x000D_
    .match(/(?:Michael )([A-Z][a-z]+)/g)_x000D_
    .map(person => person.slice(8));_x000D_
}_x000D_
_x000D_
console.log(JSON.stringify(    getMichaelLastName(inputText)    ));

_x000D_

Test for multiple cases in a switch, like an OR (||)

You need to make two case labels.

Control will fall through from the first label to the second, so they'll both execute the same code.

Depend on a branch or tag using a git URL in a package.json?

If it helps anyone, I tried everything above (https w/token mode) - and still nothing was working. I got no errors, but nothing would be installed in node_modules or package_lock.json. If I changed the token or any letter in the repo name or user name, etc. - I'd get an error. So I knew I had the right token and repo name.

I finally realized it's because the name of the dependency I had in my package.json didn't match the name in the package.json of the repo I was trying to pull. Even npm install --verbose doesn't say there's any problem. It just seems to ignore the dependency w/o error.

How to tag an older commit in Git?

The simplest way to do this is:

git tag v1.0.0 f4ba1fc
git push origin --tags

with f4ba1fc being the beginning of the hash of the commit you want to tag and v1.0.0 being the version you want to tag.

Validate Dynamically Added Input fields

$('#form-btn').click(function () {
//set global rules & messages array to use in validator
   var rules = {};
   var messages = {};
//get input, select, textarea of form
   $('#formId').find('input, select, textarea').each(function () {
      var name = $(this).attr('name');
      rules[name] = {};
      messages[name] = {};

      rules[name] = {required: true}; // set required true against every name
//apply more rules, you can also apply custom rules & messages
      if (name === "email") {
         rules[name].email = true;
         //messages[name].email = "Please provide valid email";
      }
      else if(name==='url'){
        rules[name].required = false; // url filed is not required
//add other rules & messages
      }
   });
//submit form and use above created global rules & messages array
   $('#formId').submit(function (e) {
            e.preventDefault();
        }).validate({
            rules: rules,
            messages: messages,
            submitHandler: function (form) {
            console.log("validation success");
            }
        });
});

Remove the last line from a file in Bash

To remove the last line from a file without reading the whole file or rewriting anything, you can use

tail -n 1 "$file" | wc -c | xargs -I {} truncate "$file" -s -{}

To remove the last line and also print it on stdout ("pop" it), you can combine that command with tee:

tail -n 1 "$file" | tee >(wc -c | xargs -I {} truncate "$file" -s -{})

These commands can efficiently process a very large file. This is similar to, and inspired by, Yossi's answer, but it avoids using a few extra functions.

If you're going to use these repeatedly and want error handling and some other features, you can use the poptail command here: https://github.com/donm/evenmoreutils

AssertionError: View function mapping is overwriting an existing endpoint function: main

There is a fix for Flask issue #570 introduced recenty (flask 0.10) that causes this exception to be raised.

See https://github.com/mitsuhiko/flask/issues/796

So if you go to flask/app.py and comment out the 4 lines 948..951, this may help until the issue is resovled fully in a new version.

The diff of that change is here: http://github.com/mitsuhiko/flask/commit/661ee54bc2bc1ea0763ac9c226f8e14bb0beb5b1

array filter in python?

Yes, the filter function:

filter(lambda x: x not in subset_of_A, A)

WPF: simple TextBox data binding

Just for future needs.

In Visual Studio 2013 with .NET Framework 4.5, for a window property, try adding ElementName=window to make it work.

<Grid Name="myGrid" Height="437.274">
  <TextBox Text="{Binding Path=Name2, ElementName=window}"/>
</Grid>

Gmail Error :The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required

I have a previously-working code that throws this error now. No issue on password. No need to convert message to base64 either. Turns out, i need to do the following:

Turn off 2-factor authentication
Set "Allow less secure apps" to ON
Login to your gmail account from production server
Go here as well to approve the login activity
Run your app in production server

Working code

    public static void SendEmail(string emailTo, string subject, string body)
    {
        var client = new SmtpClient("smtp.gmail.com", 587)
        {
            Credentials = new NetworkCredential("[email protected]", "secretpassword"),
            EnableSsl = true
        };

        client.Send("[email protected]", emailTo, subject, body);
    }

Turning off 2-factor authentication

Set "Allow less secure apps" to ON (same page, need to scroll to bottom)

List append() in for loop

No need to re-assign.

a=[]
for i in range(5):    
    a.append(i)
a

C# difference between == and Equals()

When == is used on an expression of type object, it'll resolve to System.Object.ReferenceEquals.

Equals is just a virtual method and behaves as such, so the overridden version will be used (which, for string type compares the contents).

How to terminate process from Python using pid?

Using the awesome psutil library it's pretty simple:

p = psutil.Process(pid)
p.terminate()  #or p.kill()

If you don't want to install a new library, you can use the os module:

import os
import signal

os.kill(pid, signal.SIGTERM) #or signal.SIGKILL

Update Git branches from master

git checkout master
git pull
git checkout feature_branch
git rebase master
git push -f

You need to do a forceful push after rebasing against master

JavaScript implementation of Gzip

We just released pako https://github.com/nodeca/pako , port of zlib to javascript. I think that's now the fastest js implementation of deflate / inflate / gzip / ungzip. Also, it has democratic MIT licence. Pako supports all zlib options and it's results are binary equal.

Example:

var inflate = require('pako/lib/inflate').inflate; 
var text = inflate(zipped, {to: 'string'});

Generate MD5 hash string with T-SQL

declare @hash nvarchar(50)
--declare @hash varchar(50)

set @hash = '1111111-2;20190110143334;001'  -- result a5cd84bfc56e245bbf81210f05b7f65f
declare @value varbinary(max);
set @value = convert(varbinary(max),@hash);


select  
 SUBSTRING(sys.fn_sqlvarbasetostr(HASHBYTES('MD5', '1111111-2;20190110143334;001')),3,32) as 'OK'
,SUBSTRING(sys.fn_sqlvarbasetostr(HASHBYTES('MD5', @hash)),3,32) as 'ERROR_01'
,SUBSTRING(sys.fn_sqlvarbasetostr(HASHBYTES('MD5',convert(varbinary(max),@hash))),3,32) as 'ERROR_02'
,SUBSTRING(sys.fn_sqlvarbasetostr(sys.fn_repl_hash_binary(convert(varbinary(max),@hash))),3,32)
,SUBSTRING(sys.fn_sqlvarbasetostr(master.sys.fn_repl_hash_binary(@value)),3,32)

Case Statement Equivalent in R

If you got factor then you could change levels by standard method:

df <- data.frame(name = c('cow','pig','eagle','pigeon'), 
             stringsAsFactors = FALSE)
df$type <- factor(df$name) # First step: copy vector and make it factor
# Change levels:
levels(df$type) <- list(
    animal = c("cow", "pig"),
    bird = c("eagle", "pigeon")
)
df
#     name   type
# 1    cow animal
# 2    pig animal
# 3  eagle   bird
# 4 pigeon   bird

You could write simple function as a wrapper:

changelevels <- function(f, ...) {
    f <- as.factor(f)
    levels(f) <- list(...)
    f
}

df <- data.frame(name = c('cow','pig','eagle','pigeon'), 
                 stringsAsFactors = TRUE)

df$type <- changelevels(df$name, animal=c("cow", "pig"), bird=c("eagle", "pigeon"))

Codeigniter: Passing data from controller to view

Protect image download

There is no full-proof method to prevent your images being downloaded/stolen.

But, some solutions like: watermarking your images(from client side or server side), implement a background image, disable/prevent right clicks, slice images into small pieces and then present as a complete image to browser, you can also use flash to show images.

Personally, recommended methods are: Watermarking and flash. But it is a difficult and almost impossible mission to accomplish. As long as user is able to "see" that image, means they take "screenshot" to steal the image.

How to bind a List<string> to a DataGridView control?

you can also use linq and anonymous types to achieve the same result with much less code as described here.

UPDATE: blog is down, here's the content:

(..) The values shown in the table represent the length of strings instead of string values (!) It may seem strange, but that’s how binding mechanism works by default – given an object it will try to bind to the first property of that object (the first property it can find). When passed an instance the String class the property it binds to is String.Length since there’s no other property that would provide the actual string itself.

That means that to get our binding right we need a wrapper object that will expose the actual value of a string as a property:

public class StringWrapper
    {
     string stringValue;
     public string StringValue { get { return stringValue; } set { stringValue = value; } }

     public StringWrapper(string s)
     {
     StringValue = s;
     }
  }   

   List<StringWrapper> testData = new List<StringWrapper>();

   // add data to the list / convert list of strings to list of string wrappers

  Table1.SetDataBinding(testdata);

While this solution works as expected it requires quite a few lines of code (mostly to convert list of strings to the list of string wrappers).

We can improve this solution by using LINQ and anonymous types- we’ll use LINQ query to create a new list of string wrappers (string wrapper will be an anonymous type in our case).

 var values = from data in testData select new { Value = data };

 Table1.SetDataBinding(values.ToList());

The last change we’re going to make is to move the LINQ code to an extension method:

public static class StringExtensions
  {
     public static IEnumerable CreateStringWrapperForBinding(this IEnumerable<string> strings)
     {
     var values = from data in strings
     select new { Value = data };

     return values.ToList();
     }

This way we can reuse the code by calling single method on any collection of strings:

Table1.SetDataBinding(testData.CreateStringWrapperForBinding());

Go build: "Cannot find package" (even though GOPATH is set)

Although the accepted answer is still correct about needing to match directories with package names, you really need to migrate to using Go modules instead of using GOPATH. New users who encounter this problem may be confused about the mentions of using GOPATH (as was I), which are now outdated. So, I will try to clear up this issue and provide guidance associated with preventing this issue when using Go modules.

If you're already familiar with Go modules and are experiencing this issue, skip down to my more specific sections below that cover some of the Go conventions that are easy to overlook or forget.

This guide teaches about Go modules: https://golang.org/doc/code.html

Project organization with Go modules

Once you migrate to Go modules, as mentioned in that article, organize the project code as described:

A repository contains one or more modules. A module is a collection of related Go packages that are released together. A Go repository typically contains only one module, located at the root of the repository. A file named go.mod there declares the module path: the import path prefix for all packages within the module. The module contains the packages in the directory containing its go.mod file as well as subdirectories of that directory, up to the next subdirectory containing another go.mod file (if any).

Each module's path not only serves as an import path prefix for its packages, but also indicates where the go command should look to download it. For example, in order to download the module golang.org/x/tools, the go command would consult the repository indicated by https://golang.org/x/tools (described more here).

An import path is a string used to import a package. A package's import path is its module path joined with its subdirectory within the module. For example, the module github.com/google/go-cmp contains a package in the directory cmp/. That package's import path is github.com/google/go-cmp/cmp. Packages in the standard library do not have a module path prefix.

You can initialize your module like this:

$ go mod init github.com/mitchell/foo-app

Your code doesn't need to be located on github.com for it to build. However, it's a best practice to structure your modules as if they will eventually be published.

Understanding what happens when trying to get a package

There's a great article here that talks about what happens when you try to get a package or module: https://medium.com/rungo/anatomy-of-modules-in-go-c8274d215c16 It discusses where the package is stored and will help you understand why you might be getting this error if you're already using Go modules.

Ensure the imported function has been exported

Note that if you're having trouble accessing a function from another file, you need to ensure that you've exported your function. As described in the first link I provided, a function must begin with an upper-case letter to be exported and made available for importing into other packages.

Names of directories

Another critical detail (as was mentioned in the accepted answer) is that names of directories are what define the names of your packages. (Your package names need to match their directory names.) You can see examples of this here: https://medium.com/rungo/everything-you-need-to-know-about-packages-in-go-b8bac62b74cc With that said, the file containing your main method (i.e., the entry point of your application) is sort of exempt from this requirement.

As an example, I had problems with my imports when using a structure like this:

/my-app
+-- go.mod
+-- /src
   +-- main.go
   +-- /utils
      +-- utils.go

I was unable to import the code in utils into my main package.

However, once I put main.go into its own subdirectory, as shown below, my imports worked just fine:

/my-app
+-- go.mod
+-- /src
   +-- /app
   |  +-- main.go
   +-- /utils
      +-- utils.go

In that example, my go.mod file looks like this:

module git.mydomain.com/path/to/repo/my-app

go 1.14

When I saved main.go after adding a reference to utils.MyFunction(), my IDE automatically pulled in the reference to my package like this:

import "git.mydomain.com/path/to/repo/my-app/src/my-app"

(I'm using VS Code with the Golang extension.)

Notice that the import path included the subdirectory to the package.

Dealing with a private repo

If the code is part of a private repo, you need to run a git command to enable access. Otherwise, you can encounter other errors This article mentions how to do that for private Github, BitBucket, and GitLab repos: https://medium.com/cloud-native-the-gathering/go-modules-with-private-git-repositories-dfe795068db4 This issue is also discussed here: What's the proper way to "go get" a private repository?

Retrofit and GET using parameters

Complete working example in Kotlin, I have replaced my API keys with 1111...

        val apiService = API.getInstance().retrofit.create(MyApiEndpointInterface::class.java)
        val params = HashMap<String, String>()
        params["q"] =  "munich,de"
        params["APPID"] = "11111111111111111"

        val call = apiService.getWeather(params)

        call.enqueue(object : Callback<WeatherResponse> {
            override fun onFailure(call: Call<WeatherResponse>?, t: Throwable?) {
                Log.e("Error:::","Error "+t!!.message)
            }

            override fun onResponse(call: Call<WeatherResponse>?, response: Response<WeatherResponse>?) {
                if (response != null && response.isSuccessful && response.body() != null) {
                    Log.e("SUCCESS:::","Response "+ response.body()!!.main.temp)

                    temperature.setText(""+ response.body()!!.main.temp)

                }
            }

        })

Adding Lombok plugin to IntelliJ project

For me it didn't work after doing all of the steps suggested in the question and in the top answer. Initially the import didn't work, and then when I restarted IntelliJ, I got these messages from the Gradle Plugin:

Gradle DSL method not found: 'annotationProcessor()'
Possible causes:<ul><li>The project 'wq-handler-service' may be using a version of the Android Gradle plug-in that does not contain the method (e.g. 'testCompile' was added in 1.1.0).
Upgrade plugin to version 2.3.2 and sync project</li><li>The project 'wq-handler-service' may be using a version of Gradle that does not contain the method.
Open Gradle wrapper file</li><li>The build file may be missing a Gradle plugin.
Apply Gradle plugin</li>

This was weird because I don't develop for Android, just using IntelliJ for Mac OS.

To be fair, my build.gradle file had these lines in the dependencies section, which I copied from a colleague:

compileOnly group: 'org.projectlombok', name: 'lombok', version: '1.16.20'
annotationProcessor group: 'org.projectlombok', name: 'lombok', version: '1.16.20'

After checking versions, the only thing that completely solved my problem was adding the below to the plugins section of build.gradle, which I found on this page:

id 'net.ltgt.apt' version '0.15'

Looks like it's a

Gradle plugin making it easier/safer to use Java annotation processors

(ltgt plugin page)

Getting the application's directory from a WPF application

I used simply string baseDir = Environment.CurrentDirectory; and its work for me.

Good Luck

Edit:

I used to delete this type of mistake but i prefer to edit it because i think the minus point on this answer help people to know about wrong way. :) I understood the above solution is not useful and i changed it to string appBaseDir = System.AppDomain.CurrentDomain.BaseDirectory; Other ways to get it are:

1. string baseDir =   
    System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
 2. String exePath = System.Environment.GetCommandLineArgs()[0];
 3. string appBaseDir =    System.IO.Path.GetDirectoryName
    (System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName);

Good Luck

Using lambda expressions for event handlers

There are no performance implications since the compiler will translate your lambda expression into an equivalent delegate. Lambda expressions are nothing more than a language feature that the compiler translates into the exact same code that you are used to working with.

The compiler will convert the code you have to something like this:

public partial class MyPage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //snip
        MyButton.Click += new EventHandler(delegate (Object o, EventArgs a) 
        {
            //snip
        });
    }
}

Passing array in GET for a REST call

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

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

So,

/appointments?users=id1,id2

is fine as a filtered RESTful resource.

JPA getSingleResult() or null

Here's a good option for doing this:

public static <T> T getSingleResult(TypedQuery<T> query) {
    query.setMaxResults(1);
    List<T> list = query.getResultList();
    if (list == null || list.isEmpty()) {
        return null;
    }

    return list.get(0);
}

SSIS Convert Between Unicode and Non-Unicode Error

When creating table in SQL Server make your table columns NVARCHAR instead of VARCHAR.

Toggle input disabled attribute using jQuery


    $('#checkbox').click(function(){
        $('#submit').attr('disabled', !$(this).attr('checked'));
    });

Reference alias (calculated in SELECT) in WHERE clause

It's actually possible to effectively define a variable that can be used in both the SELECT, WHERE and other clauses.

A cross join doesn't necessarily allow for appropriate binding to the referenced table columns, however OUTER APPLY does - and treats nulls more transparently.

SELECT
    vars.BalanceDue
FROM
    Entity e
OUTER APPLY (
    SELECT
        -- variables   
        BalanceDue = e.EntityTypeId,
        Variable2 = ...some..long..complex..expression..etc...
    ) vars
WHERE
    vars.BalanceDue > 0

Kudos to Syed Mehroz Alam.

How to find controls in a repeater header or footer

private T GetHeaderControl<T>(Repeater rp, string id) where T : Control
{
    T returnValue = null;
    if (rp != null && !String.IsNullOrWhiteSpace(id))
    {
        returnValue = rp.Controls.Cast<RepeaterItem>().Where(i => i.ItemType == ListItemType.Header).Select(h => h.FindControl(id) as T).Where(c => c != null).FirstOrDefault();
    }
    return returnValue;
}

Finds and casts the control. (Based on Piyey's VB answer)

What are the new features in C++17?

Language features:

Templates and Generic Code

Template argument deduction for class templates
- Like how functions deduce template arguments, now constructors can deduce the template arguments of the class
- http://wg21.link/p0433r2 http://wg21.link/p0620r0 http://wg21.link/p0512r0
template <auto>
- Represents a value of any (non-type template argument) type.
Non-type template arguments fixes
template<template<class...>typename bob> struct foo {}
( Folding + ... + expressions ) and Revisions
auto x{8}; is an int
modernizing using with ... and lists

Lambda

constexpr lambdas
- Lambdas are implicitly constexpr if they qualify
Capturing *this in lambdas
- [*this]{ std::cout << could << " be " << useful << '\n'; }

Attributes

[[fallthrough]], [[nodiscard]], [[maybe_unused]] attributes
[[attributes]] on namespaces and enum { erator[[s]] }
using in attributes to avoid having to repeat an attribute namespace.
Compilers are now required to ignore non-standard attributes they don't recognize.
- The C++14 wording allowed compilers to reject unknown scoped attributes.

Syntax cleanup

Inline variables
- Like inline functions
- Compiler picks where the instance is instantiated
- Deprecate static constexpr redeclaration, now implicitly inline.
namespace A::B
Simple static_assert(expression); with no string
no throw unless throw(), and throw() is noexcept(true).

Cleaner multi-return and flow control

Structured bindings
- Basically, first-class std::tie with auto
- Example:
  - const auto [it, inserted] = map.insert( {"foo", bar} );
  - Creates variables it and inserted with deduced type from the pair that map::insert returns.
- Works with tuple/pair-likes & std::arrays and relatively flat structs
- Actually named structured bindings in standard
if (init; condition) and switch (init; condition)
- if (const auto [it, inserted] = map.insert( {"foo", bar} ); inserted)
- Extends the if(decl) to cases where decl isn't convertible-to-bool sensibly.
Generalizing range-based for loops
- Appears to be mostly support for sentinels, or end iterators that are not the same type as begin iterators, which helps with null-terminated loops and the like.
if constexpr
- Much requested feature to simplify almost-generic code.

Misc

Hexadecimal float point literals
Dynamic memory allocation for over-aligned data
Guaranteed copy elision
- Finally!
- Not in all cases, but distinguishes syntax where you are "just creating something" that was called elision, from "genuine elision".
Fixed order-of-evaluation for (some) expressions with some modifications
- Not including function arguments, but function argument evaluation interleaving now banned
- Makes a bunch of broken code work mostly, and makes .then on future work.
Direct list-initialization of enums
Forward progress guarantees (FPG) (also, FPGs for parallel algorithms)
- I think this is saying "the implementation may not stall threads forever"?
u8'U', u8'T', u8'F', u8'8' character literals (string already existed)
"noexcept" in the type system
__has_include
- Test if a header file include would be an error
- makes migrating from experimental to std almost seamless
Arrays of pointer conversion fixes
inherited constructors fixes to some corner cases (see P0136R0 for examples of behavior changes)
aggregate initialization with inheritance.
std::launder, type punning, etc

Library additions:

Data types

std::variant<Ts...>
- Almost-always non-empty last I checked?
- Tagged union type
- {awesome|useful}
std::optional
- Maybe holds one of something
- Ridiculously useful
std::any
- Holds one of anything (that is copyable)
std::string_view
- std::string like reference-to-character-array or substring
- Never take a string const& again. Also can make parsing a bajillion times faster.
- "hello world"sv
- constexpr char_traits
std::byte off more than they could chew.
- Neither an integer nor a character, just data

Invoke stuff

std::invoke
- Call any callable (function pointer, function, member pointer) with one syntax. From the standard INVOKE concept.
std::apply
- Takes a function-like and a tuple, and unpacks the tuple into the call.
std::make_from_tuple, std::apply applied to object construction
is_invocable, is_invocable_r, invoke_result
- http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0077r2.html
- http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0604r0.html
- Deprecates result_of
- is_invocable<Foo(Args...), R> is "can you call Foo with Args... and get something compatible with R", where R=void is default.
- invoke_result<Foo, Args...> is std::result_of_t<Foo(Args...)> but apparently less confusing?

File System TS v1

New algorithms

for_each_n
reduce
transform_reduce
exclusive_scan
inclusive_scan
transform_exclusive_scan
transform_inclusive_scan
Added for threading purposes, exposed even if you aren't using them threaded

Threading

std::shared_mutex
- Untimed, which can be more efficient if you don't need it.
atomic<T>::is_always_lockfree
scoped_lock<Mutexes...>
- Saves some std::lock pain when locking more than one mutex at a time.
Parallelism TS v1
- The linked paper from 2014, may be out of date
- Parallel versions of std algorithms, and related machinery
hardware_*_interference_size

(parts of) Library Fundamentals TS v1 not covered above or below

[func.searchers] and [alg.search]
- A searching algorithm and techniques
[pmr]
- Polymorphic allocator, like std::function for allocators
- And some standard memory resources to go with it.
- http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0358r1.html
std::sample, sampling from a range?

Container Improvements

try_emplace and insert_or_assign
- gives better guarantees in some cases where spurious move/copy would be bad
Splicing for map<>, unordered_map<>, set<>, and unordered_set<>
- Move nodes between containers cheaply.
- Merge whole containers cheaply.
non-const .data() for string.
non-member std::size, std::empty, std::data
- like std::begin/end
Minimal incomplete type support in containers
Contiguous iterator "concept"
constexpr iterators
The emplace family of functions now returns a reference to the created object.

Smart pointer changes

unique_ptr<T[]> fixes and other unique_ptr tweaks.
weak_from_this and some fixed to shared from this

Other `std` datatype improvements:

{} construction of std::tuple and other improvements
TriviallyCopyable reference_wrapper, can be performance boost

Misc

C++17 library is based on C11 instead of C99
Reserved std[0-9]+ for future standard libraries
destroy(_at|_n), uninitialized_move(_n), uninitialized_value_construct(_n), uninitialized_default_construct(_n)
- utility code already in most std implementations exposed
Special math functions
- scientists may like them
std::clamp()
- std::clamp( a, b, c ) == std::max( b, std::min( a, c ) ) roughly
gcd and lcm
std::uncaught_exceptions
- Required if you want to only throw if safe from destructors
std::as_const
std::bool_constant
A whole bunch of _v template variables
std::void_t<T>
- Surprisingly useful when writing templates
std::owner_less<void>
- like std::less<void>, but for smart pointers to sort based on contents
std::chrono polish
std::conjunction, std::disjunction, std::negation exposed
std::not_fn
- http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0358r1.html
Rules for noexcept within std
std::is_contiguous_layout, useful for efficient hashing
std::to_chars/std::from_chars, high performance, locale agnostic number conversion; finally a way to serialize/deserialize to human readable formats (JSON & co)
~~std::default_order, indirection over std::less.~~ (breaks ABI of some compilers due to name mangling, removed.)

Traits

Deprecated

Some C libraries,
<codecvt>
memory_order_consume
result_of, replaced with invoke_result
shared_ptr::unique, it isn't very threadsafe

Isocpp.org has has an independent list of changes since C++14; it has been partly pillaged.

Naturally TS work continues in parallel, so there are some TS that are not-quite-ripe that will have to wait for the next iteration. The target for the next iteration is C++20 as previously planned, not C++19 as some rumors implied. C++1O has been avoided.

Initial list taken from this reddit post and this reddit post, with links added via googling or from the above isocpp.org page.

Additional entries pillaged from SD-6 feature-test list.

clang's feature list and library feature list are next to be pillaged. This doesn't seem to be reliable, as it is C++1z, not C++17.

these slides had some features missing elsewhere.

While "what was removed" was not asked, here is a short list of a few things ((mostly?) previous deprecated) that are removed in C++17 from C++:

Removed:

register, keyword reserved for future use
bool b; ++b;
trigraphs
- if you still need them, they are now part of your source file encoding, not part of language
ios aliases
auto_ptr, old <functional> stuff, random_shuffle
allocators in std::function

There were rewordings. I am unsure if these have any impact on code, or if they are just cleanups in the standard:

Papers not yet integrated into above:

P0505R0 (constexpr chrono)
P0418R2 (atomic tweaks)
P0512R0 (template argument deduction tweaks)
P0490R0 (structured binding tweaks)
P0513R0 (changes to std::hash)
P0502R0 (parallel exceptions)
P0509R1 (updating restrictions on exception handling)
P0012R1 (make exception specifications be part of the type system)
P0510R0 (restrictions on variants)
P0504R0 (tags for optional/variant/any)
P0497R0 (shared ptr tweaks)
P0508R0 (structured bindings node handles)
P0521R0 (shared pointer use count and unique changes?)

Spec changes:

exception specs and throw expressions

Further reference:

papers grouped by year; not all accepted
https://isocpp.org/files/papers/p0636r0.html
- Should be updated to "Modifications to existing features" here.

Find element's index in pandas Series

>>> myseries[myseries == 7]
3    7
dtype: int64
>>> myseries[myseries == 7].index[0]
3

Though I admit that there should be a better way to do that, but this at least avoids iterating and looping through the object and moves it to the C level.

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

Get year, month or day from numpy datetime64

If you upgrade to numpy 1.7 (where datetime is still labeled as experimental) the following should work.

dates/np.timedelta64(1,'Y')

Selecting a Linux I/O Scheduler

It's possible to use a udev rule to let the system decide on the scheduler based on some characteristics of the hw.
An example udev rule for SSDs and other non-rotational drives might look like

# set noop scheduler for non-rotating disks
ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="noop"

inside a new udev rules file (e.g., /etc/udev/rules.d/60-ssd-scheduler.rules). This answer is based on the debian wiki

To check whether ssd disks would use the rule, it's possible to check for the trigger attribute in advance:

for f in /sys/block/sd?/queue/rotational; do printf "$f "; cat $f; done

How to export data to an excel file using PHPExcel

I currently use this function in my project after a series of googling to download excel file from sql statement

    // $sql = sql query e.g "select * from mytablename"
    // $filename = name of the file to download 
        function queryToExcel($sql, $fileName = 'name.xlsx') {
                // initialise excel column name
                // currently limited to queries with less than 27 columns
        $columnArray = array("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z");
                // Execute the database query
                $result =  mysql_query($sql) or die(mysql_error());

                // Instantiate a new PHPExcel object
                $objPHPExcel = new PHPExcel();
                // Set the active Excel worksheet to sheet 0
                $objPHPExcel->setActiveSheetIndex(0);
                // Initialise the Excel row number
                $rowCount = 1;
    // fetch result set column information
                $finfo = mysqli_fetch_fields($result);
// initialise columnlenght counter                
$columnlenght = 0;
                foreach ($finfo as $val) {
// set column header values                   
  $objPHPExcel->getActiveSheet()->SetCellValue($columnArray[$columnlenght++] . $rowCount, $val->name);
                }
// make the column headers bold
                $objPHPExcel->getActiveSheet()->getStyle($columnArray[0]."1:".$columnArray[$columnlenght]."1")->getFont()->setBold(true);

                $rowCount++;
                // Iterate through each result from the SQL query in turn
                // We fetch each database result row into $row in turn

                while ($row = mysqli_fetch_array($result, MYSQL_NUM)) {
                    for ($i = 0; $i < $columnLenght; $i++) {
                        $objPHPExcel->getActiveSheet()->SetCellValue($columnArray[$i] . $rowCount, $row[$i]);
                    }
                    $rowCount++;
                }
// set header information to force download
                header('Content-type: application/vnd.ms-excel');
                header('Content-Disposition: attachment; filename="' . $fileName . '"');
                // Instantiate a Writer to create an OfficeOpenXML Excel .xlsx file        
                // Write the Excel file to filename some_excel_file.xlsx in the current directory                
                $objWriter = new PHPExcel_Writer_Excel2007($objPHPExcel); 
                // Write the Excel file to filename some_excel_file.xlsx in the current directory
                $objWriter->save('php://output');
            }

What is the difference between a var and val definition in Scala?

The difference is that a var can be re-assigned to whereas a val cannot. The mutability, or otherwise of whatever is actually assigned, is a side issue:

import collection.immutable
import collection.mutable
var m = immutable.Set("London", "Paris")
m = immutable.Set("New York") //Reassignment - I have change the "value" at m.

Whereas:

val n = immutable.Set("London", "Paris")
n = immutable.Set("New York") //Will not compile as n is a val.

And hence:

val n = mutable.Set("London", "Paris")
n = mutable.Set("New York") //Will not compile, even though the type of n is mutable.

If you are building a data structure and all of its fields are vals, then that data structure is therefore immutable, as its state cannot change.

How to read from stdin with fgets()?

Exits the loop if the line is empty(Improving code).

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

// The value BUFFERSIZE can be changed to customer's taste . Changes the
// size of the base array (string buffer )    
#define BUFFERSIZE 10

int main(void)
{
    char buffer[BUFFERSIZE];
    char cChar;
    printf("Enter a message: \n");
    while(*(fgets(buffer, BUFFERSIZE, stdin)) != '\n')
    {
        // For concatenation
        // fgets reads and adds '\n' in the string , replace '\n' by '\0' to 
        // remove the line break .
/*      if(buffer[strlen(buffer) - 1] == '\n')
            buffer[strlen(buffer) - 1] = '\0'; */
        printf("%s", buffer);
        // Corrects the error mentioned by Alain BECKER.       
        // Checks if the string buffer is full to check and prevent the 
        // next character read by fgets is '\n' .
        if(strlen(buffer) == (BUFFERSIZE - 1) && (buffer[strlen(buffer) - 1] != '\n'))
        {
            // Prevents end of the line '\n' to be read in the first 
            // character (Loop Exit) in the next loop. Reads
            // the next char in stdin buffer , if '\n' is read and removed, if
            // different is returned to stdin 
            cChar = fgetc(stdin);
            if(cChar != '\n')
                ungetc(cChar, stdin);
            // To print correctly if '\n' is removed.
            else
                printf("\n");
        }
    }
    return 0;
}

Exit when Enter is pressed.

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

#define BUFFERSIZE 16

int main(void)
{
    char buffer[BUFFERSIZE];
    printf("Enter a message: \n");
    while(true)
    {
        assert(fgets(buffer, BUFFERSIZE, stdin) != NULL);
        // Verifies that the previous character to the last character in the
        // buffer array is '\n' (The last character is '\0') if the
        // character is '\n' leaves loop.
        if(buffer[strlen(buffer) - 1] == '\n')
        {
            // fgets reads and adds '\n' in the string, replace '\n' by '\0' to 
            // remove the line break .
            buffer[strlen(buffer) - 1] = '\0';
            printf("%s", buffer);
            break;
        }
        printf("%s", buffer);   
    }
    return 0;
}

Concatenation and dinamic allocation(linked list) to a single string.

/* Autor : Tiago Portela
   Email : [email protected]
   Sobre : Compilado com TDM-GCC 5.10 64-bit e LCC-Win32 64-bit;
   Obs : Apenas tentando aprender algoritimos, sozinho, por hobby. */

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <assert.h>

#define BUFFERSIZE 8

typedef struct _Node {
    char *lpBuffer;
    struct _Node *LpProxNode;
} Node_t, *LpNode_t;

int main(void)
{
    char acBuffer[BUFFERSIZE] = {0};
    LpNode_t lpNode = (LpNode_t)malloc(sizeof(Node_t));
    assert(lpNode!=NULL);
    LpNode_t lpHeadNode = lpNode;
    char* lpBuffer = (char*)calloc(1,sizeof(char));
    assert(lpBuffer!=NULL);
    char cChar;


    printf("Enter a message: \n");
    // Exit when Enter is pressed
/*  while(true)
    {
        assert(fgets(acBuffer, BUFFERSIZE, stdin)!=NULL);
        lpNode->lpBuffer = (char*)malloc((strlen(acBuffer) + 1) * sizeof(char));
        assert(lpNode->lpBuffer!=NULL);
        strcpy(lpNode->lpBuffer, acBuffer);
        if(lpNode->lpBuffer[strlen(acBuffer) - 1] == '\n')
        {
            lpNode->lpBuffer[strlen(acBuffer) - 1] = '\0';
            lpNode->LpProxNode = NULL;
            break;
        }
        lpNode->LpProxNode = (LpNode_t)malloc(sizeof(Node_t));
        lpNode = lpNode->LpProxNode;
        assert(lpNode!=NULL);
    }*/

    // Exits the loop if the line is empty(Improving code).
    while(true)
    {
        assert(fgets(acBuffer, BUFFERSIZE, stdin)!=NULL);
        lpNode->lpBuffer = (char*)malloc((strlen(acBuffer) + 1) * sizeof(char));
        assert(lpNode->lpBuffer!=NULL);
        strcpy(lpNode->lpBuffer, acBuffer);
        if(acBuffer[strlen(acBuffer) - 1] == '\n')
            lpNode->lpBuffer[strlen(acBuffer) - 1] = '\0';
        if(strlen(acBuffer) == (BUFFERSIZE - 1) && (acBuffer[strlen(acBuffer) - 1] != '\n'))
        {
            cChar = fgetc(stdin);
            if(cChar != '\n')
                ungetc(cChar, stdin);
        }
        if(acBuffer[0] == '\n')
        {
            lpNode->LpProxNode = NULL;
            break;
        }
        lpNode->LpProxNode = (LpNode_t)malloc(sizeof(Node_t));
        lpNode = lpNode->LpProxNode;
        assert(lpNode!=NULL);
    }


    printf("\nPseudo String :\n");
    lpNode = lpHeadNode;
    while(lpNode != NULL)
    {
        printf("%s", lpNode->lpBuffer);
        lpNode = lpNode->LpProxNode;
    }


    printf("\n\nMemory blocks:\n");
    lpNode = lpHeadNode;
    while(lpNode != NULL)
    {
        printf("Block \"%7s\" size = %lu\n", lpNode->lpBuffer, (long unsigned)(strlen(lpNode->lpBuffer) + 1));
        lpNode = lpNode->LpProxNode;
    }


    printf("\nConcatenated string:\n");
    lpNode = lpHeadNode;
    while(lpNode != NULL)
    {
        lpBuffer = (char*)realloc(lpBuffer, (strlen(lpBuffer) + strlen(lpNode->lpBuffer)) + 1);
        strcat(lpBuffer, lpNode->lpBuffer);
        lpNode = lpNode->LpProxNode;
    }
    printf("%s", lpBuffer);
    printf("\n\n");

    // Deallocate memory
    lpNode = lpHeadNode;
    while(lpNode != NULL)
    {
        lpHeadNode = lpNode->LpProxNode;
        free(lpNode->lpBuffer);
        free(lpNode);
        lpNode = lpHeadNode;
    }
    lpBuffer = (char*)realloc(lpBuffer, 0);
    lpBuffer = NULL;
    if((lpNode == NULL) && (lpBuffer == NULL))
    {

        printf("Deallocate memory = %s", (char*)lpNode);
    }
    printf("\n\n");

    return 0;
}

How can I change my Cygwin home folder after installation?

I'd like to add a correction/update to the bit about $HOME taking precedence. The home directory in /etc/passwd takes precedence over everything.

I'm a long time Cygwin user and I just did a clean install of Windows 7 x64 and Cygwin V1.126. I was going nuts trying to figure out why every time I ran ssh I kept getting:

e:\>ssh foo.bar.com
Could not create directory '/home/dhaynes/.ssh'.
The authenticity of host 'foo.bar.com (10.66.19.19)' can't be established.
...

I add the HOME=c:\users\dhaynes definition in the Windows environment but still it kept trying to create '/home/dhaynes'. I tried every combo I could including setting HOME to /cygdrive/c/users/dhaynes. Googled for the error message, could not find anything, couldn't find anything on the cygwin site. I use cygwin from cmd.exe, not bash.exe but the problem was present in both.

I finally realized that the home directory in /etc/passwd was taking precedence over the $HOME environment variable. I simple re-ran 'mkpasswd -l >/etc/passwd' and that updated the home directory, now all is well with ssh.

That may be obvious to linux types with sysadmin experience but for those of us who primarily use Windows it's a bit obscure.

How do I add multiple conditions to "ng-disabled"?

this way worked for me

ng-disabled="(user.Role.ID != 1) && (user.Role.ID != 2)"

Examples for string find in Python

I'm not sure what you're looking for, do you mean find()?

>>> x = "Hello World"
>>> x.find('World')
6
>>> x.find('Aloha');
-1

Getting the IP Address of a Remote Socket Endpoint

RemoteEndPoint is a property, its type is System.Net.EndPoint which inherits from System.Net.IPEndPoint.

If you take a look at IPEndPoint's members, you'll see that there's an Address property.

unix sort descending order

If you only want to sort only on the 5th field then use -k5,5.

Also, use the -t command line switch to specify the delimiter to tab. Try this:

sort  -k5,5 -r -n -t \t filename

or if the above doesn't work (with the tab) this:

sort  -k5,5 -r -n -t $'\t' filename

The man page for sort states:

-t, --field-separator=SEP use SEP instead of non-blank to blank transition

Finally, this SO question Unix Sort with Tab Delimiter might be helpful.

Remove whitespaces inside a string in javascript

Probably because you forgot to implement the solution in the accepted answer. That's the code that makes trim() work.

update

This answer only applies to older browsers. Newer browsers apparently support trim() natively.

Limiting the number of characters in a JTextField

_x000D_

private void jTextField1KeyTyped(java.awt.event.KeyEvent evt) {                                   _x000D_
if (jTextField1.getText().length()>=3) {_x000D_
            getToolkit().beep();_x000D_
            evt.consume();_x000D_
        }_x000D_
    }

_x000D_

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 32 bytes)

128M == 134217728, the number you are seeing.

The memory limit is working fine. When it says it tried to allocate 32 bytes, that the amount requested by the last operation before failing.

Are you building any huge arrays or reading large text files? If so, remember to free any memory you don't need anymore, or break the task down into smaller steps.

How to Get enum item name from its value

You can define an operator that performs the output.

std::ostream& operator<<(std::ostream& lhs, WeekEnum e) {
    switch(e) {
    case Monday: lhs << "Monday"; break;
    .. etc
    }
    return lhs;
}

How to change the color of progressbar in C# .NET 3.5?

I know its way too old to be answered now.. but still, a small tweak to @Daniel's answer for rectifying the problem of not showing zero valued progress bar. Just draw the Progress only if the inner rectangle's width is found to be non-zero.

Thanks to all the contributers.

        public class ProgressBarEx : ProgressBar
        {
            public ProgressBarEx()
            {
                this.SetStyle(ControlStyles.UserPaint, true);
            }

            protected override void OnPaintBackground(PaintEventArgs pevent){}
                // None... Helps control the flicker.                

            protected override void OnPaint(PaintEventArgs e)
            {
                const int inset = 2; // A single inset value to control teh sizing of the inner rect.

                using (Image offscreenImage = new Bitmap(this.Width, this.Height))
                {
                    using (Graphics offscreen = Graphics.FromImage(offscreenImage))
                    {
                        Rectangle rect = new Rectangle(0, 0, this.Width, this.Height);

                        if (ProgressBarRenderer.IsSupported)
                            ProgressBarRenderer.DrawHorizontalBar(offscreen, rect);

                        rect.Inflate(new Size(-inset, -inset)); // Deflate inner rect.
                        rect.Width = (int)(rect.Width * ((double)this.Value / this.Maximum));

                        if (rect.Width != 0)
                        {
                            LinearGradientBrush brush = new LinearGradientBrush(rect, this.ForeColor, this.BackColor, LinearGradientMode.Vertical);
                            offscreen.FillRectangle(brush, inset, inset, rect.Width, rect.Height);
                            e.Graphics.DrawImage(offscreenImage, 0, 0);
                            offscreenImage.Dispose();
                        }
                    }
                }
            }
        }

Bootstrap - How to add a logo to navbar class?

You can just display both the text and image as inline-blocks so that they dont stack. using floats like pull-left/pull-right can cause undesired issues so they should be used sparingly

<a class="navbar-brand" href="#">
  <img src="mylogo.png" style="display: inline-block;">
  <span style="display: inline-block;">My Company</span>
</a>

When is std::weak_ptr useful?

When we does not want to own the object:

Ex:

class A
{
    shared_ptr<int> sPtr1;
    weak_ptr<int> wPtr1;
}

In the above class wPtr1 does not own the resource pointed by wPtr1. If the resource is got deleted then wPtr1 is expired.

To avoid circular dependency:

shard_ptr<A> <----| shared_ptr<B> <------
    ^             |          ^          |
    |             |          |          |
    |             |          |          |
    |             |          |          |
    |             |          |          |
class A           |     class B         |
    |             |          |          |
    |             ------------          |
    |                                   |
    -------------------------------------

Now if we make the shared_ptr of the class B and A, the use_count of the both pointer is two.

When the shared_ptr goes out od scope the count still remains 1 and hence the A and B object does not gets deleted.

class B;

class A
{
    shared_ptr<B> sP1; // use weak_ptr instead to avoid CD

public:
    A() {  cout << "A()" << endl; }
    ~A() { cout << "~A()" << endl; }

    void setShared(shared_ptr<B>& p)
    {
        sP1 = p;
    }
};

class B
{
    shared_ptr<A> sP1;

public:
    B() {  cout << "B()" << endl; }
    ~B() { cout << "~B()" << endl; }

    void setShared(shared_ptr<A>& p)
    {
        sP1 = p;
    }
};

int main()
{
    shared_ptr<A> aPtr(new A);
    shared_ptr<B> bPtr(new B);

    aPtr->setShared(bPtr);
    bPtr->setShared(aPtr);

    return 0;  
}

output:

A()
B()

As we can see from the output that A and B pointer are never deleted and hence memory leak.

To avoid such issue just use weak_ptr in class A instead of shared_ptr which makes more sense.

How to use find command to find all files with extensions from list?

On Mac OS use

find -E packages  -regex ".*\.(jpg|gif|png|jpeg)"

Adding a JAR to an Eclipse Java library

In Eclipse Ganymede (3.4.0):

Select the library and click "Edit" (left side of the window)
Click "User Libraries"
Select the library again and click "Add JARs"

Formatting DataBinder.Eval data

You can use a function into a repeater like you said, but notice that the DataBinder.Eval returns an object and you have to cast it to a DateTime.

You also can format your field inline:

<%# ((DateTime)DataBinder.Eval(Container.DataItem,"publishedDate")).ToString("yyyy-MMM-dd") %>

If you use ASP.NET 2.0 or newer you can write this as below:

<%# ((DateTime)Eval("publishedDate")).ToString("yyyy-MMM-dd") %>

Another option is to bind the value to label at OnItemDataBound event.

OpenMP set_num_threads() is not working

The omp_get_num_threads() function returns the number of threads that are currently in the team executing the parallel region from which it is called. You are calling it outside of the parallel region, which is why it returns 1.

What's the difference between "Request Payload" vs "Form Data" as seen in Chrome dev tools Network tab

The Request Payload - or to be more precise: payload body of a HTTP Request - is the data normally send by a POST or PUT Request. It's the part after the headers and the CRLF of a HTTP Request.

A request with Content-Type: application/json may look like this:

POST /some-path HTTP/1.1
Content-Type: application/json

{ "foo" : "bar", "name" : "John" }

If you submit this per AJAX the browser simply shows you what it is submitting as payload body. That’s all it can do because it has no idea where the data is coming from.

If you submit a HTML-Form with method="POST" and Content-Type: application/x-www-form-urlencoded or Content-Type: multipart/form-data your request may look like this:

POST /some-path HTTP/1.1
Content-Type: application/x-www-form-urlencoded

foo=bar&name=John

In this case the form-data is the request payload. Here the Browser knows more: it knows that bar is the value of the input-field foo of the submitted form. And that’s what it is showing to you.

So, they differ in the Content-Type but not in the way data is submitted. In both cases the data is in the message-body. And Chrome distinguishes how the data is presented to you in the Developer Tools.

Programs & Examples On #Android ndk r5

Where do I find old versions of Android NDK?

gradlew: Permission Denied

How to check a string against null in java?

Removing the first 3 characters from a string

How can Print Preview be called from Javascript?

Please add a @Pipe/@Directive/@Component annotation. Error

How to format string to money

Is there a naming convention for MySQL?

Is there a way to 'uniq' by column?

How do I POST urlencoded form data with $http without jQuery?

URL-encoding variables using only AngularJS services

See a more verbose Plunker demo

How are $httpParamSerializerJQLike and $httpParamSerializer different

rails 3.1.0 ActionView::Template::Error (application.css isn't precompiled)

Validating Phone Numbers Using Javascript

close fxml window by code, javafx

Converting String to Cstring in C++

The view or its master was not found or no view engine supports the searched locations

How to provide shadow to Button

A button to start php script, how?

Git: Find the most recent common ancestor of two branches

PHP $_POST not working?

How to make Bootstrap Panel body with fixed height

Add an element to an array in Swift

Combining node.js and Python

Remove sensitive files and their commits from Git history

How do I make a new line in swift

"\n" is not working everywhere!

CSS3 transform not working

How to access Spring context in jUnit tests annotated with @RunWith and @ContextConfiguration?

Java Desktop application: SWT vs. Swing

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space

If input value is blank, assign a value of "empty" with Javascript

How to insert a file in MySQL database?

how to write an array to a file Java

How to send a pdf file directly to the printer using JavaScript?

Null check in an enhanced for loop

How to parse JSON to receive a Date object in JavaScript?

Can curl make a connection to any TCP ports, not just HTTP/HTTPS?

"replace" function examples

Java converting int to hex and back again

Visual Studio keyboard shortcut to display IntelliSense

PHP: HTML: send HTML select option attribute in POST

How can I remove the decimal part from JavaScript number?

How to concatenate a std::string and an int?

Write-Host => Export to a file

How do I use sudo to redirect output to a location I don't have permission to write to?

postgresql COUNT(DISTINCT ...) very slow

Converting Epoch time into the datetime

Full screen background image in an activity

Join two data frames, select all columns from one and some columns from the other

AngularJS + JQuery : How to get dynamic content working in angularjs

Connection pooling options with JDBC: DBCP vs C3P0

Python: SyntaxError: non-keyword after keyword arg

How to convert a Bitmap to Drawable in android?

Decompile .smali files on an APK

Java ArrayList of Arrays?

How to check the differences between local and github before the pull

Python truncate a long string

Zsh: Conda/Pip installs command not found

Clone only one branch

How to have multiple CSS transitions on an element?

Reading Xml with XmlReader in C#

What are the best PHP input sanitizing functions?

React Native fixed footer

Clearing Magento Log Data

How do I draw a shadow under a UIView?

Explicitly assigning values to a 2D Array?

Creating an iframe with given HTML dynamically

Does WhatsApp offer an open API?

Control the size of points in an R scatterplot?

How to increase Bootstrap Modal Width?

how to create Socket connection in Android?

How to delete a remote tag?

What is a regular expression for a MAC Address?

How do I pass command line arguments to a Node.js program?

webpack: Module not found: Error: Can't resolve (with relative path)

Java error: Implicit super constructor is undefined for default constructor

Looping through JSON with node.js

How are `$httpParamSerializerJQLike` and `$httpParamSerializer` different

`"\n"` is not working everywhere!

If you're using `v1.7.x` or earlier