Programs & Examples On #Datagridviewcellstyle

What is difference between sjlj vs dwarf vs seh?

SJLJ (setjmp/longjmp): – available for 32 bit and 64 bit – not “zero-cost”: even if an exception isn’t thrown, it incurs a minor performance penalty (~15% in exception heavy code) – allows exceptions to traverse through e.g. windows callbacks

DWARF (DW2, dwarf-2) – available for 32 bit only – no permanent runtime overhead – needs whole call stack to be dwarf-enabled, which means exceptions cannot be thrown over e.g. Windows system DLLs.

SEH (zero overhead exception) – will be available for 64-bit GCC 4.8.


css background image in a different folder from css

Html file (/index.html)

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Untitled Document</title>
     <link rel="stylesheet" media="screen" href="assets/css/style.css" />
     <h1>Background Image</h1>

Css file (/assets/css/style.css)


Show diff between commits

Simplest for checking the changes in the last 2 commits after pull:

git diff HEAD~2 

PHP PDO: charset, set names?

This is probably the most elegant way to do it.
Right in the PDO constructor call, but avoiding the buggy charset option (as mentioned above):

$connect = new PDO(

Works great for me.

Can't draw Histogram, 'x' must be numeric

Use the dec argument to set "," as the decimal point by adding:

 ce <- read.table("file.txt", header = TRUE, dec = ",")

php/mySQL on XAMPP: password for phpMyAdmin and mysql_connect different?

You need to change the password directly in the database because at mysql the users and their profiles are saved in the database.

So there are several ways. At phpMyAdmin you simple go to user admin, choose root and change the password.

Convert an object to an XML string

I realize this is a very old post, but after looking at L.B's response I thought about how I could improve upon the accepted answer and make it generic for my own application. Here's what I came up with:

public static string Serialize<T>(T dataToSerialize)
        var stringwriter = new System.IO.StringWriter();
        var serializer = new XmlSerializer(typeof(T));
        serializer.Serialize(stringwriter, dataToSerialize);
        return stringwriter.ToString();

public static T Deserialize<T>(string xmlText)
        var stringReader = new System.IO.StringReader(xmlText);
        var serializer = new XmlSerializer(typeof(T));
        return (T)serializer.Deserialize(stringReader);

These methods can now be placed in a static helper class, which means no code duplication to every class that needs to be serialized.

Pytesseract : "TesseractNotFound Error: tesseract is not installed or it's not in your path", how do I fix this?

There are already many nice answers to this problem but I would like to share a wonderful site that I came across when I couldnt solve the 'TesseractNotFound Error: tesseract is not installed or it's not in your path” Please refer this site:

I realised that I got this error because I installed pytesseract with pip but forget to install the binary. You are probably missing tesseract-ocr from your machine. Check the installation instructions here:

On a Mac, you can just install using homebrew:

brew install tesseract

It should run fine after that!

Under Windows 10 OS environment, the following method works for me:

  1. Go to this link and Download tesseract and install it. Windows version is available here:

  2. Find script file from C:\Users\User\Anaconda3\Lib\site-packages\pytesseract and open it. Change the following code from tesseract_cmd = 'tesseract' to: tesseract_cmd = 'C:/Program Files (x86)/Tesseract-OCR/tesseract.exe' (This is the path where you install Tesseract-OCR so please check where you install it and accordingly update the path)

  3. You may also need to add environment variable C:/Program Files (x86)/Tesseract-OCR/

Hope it works for you!

Typescript react - Could not find a declaration file for module ''react-materialize'. 'path/to/module-name.js' implicitly has an any type

If there is no @types/<package> for the module you are using, you may easily circumvent the issue by adding a // @ts-ignore comment above i.e.

// @ts-ignore
import { Navbar, NavItem } from 'react-materialize';

Alternatively you may create the missing @types/<package> following:

declaration files publishing

DefinitelyTyped how can i contribute

How can I strip first and last double quotes?

If you can't assume that all the strings you process have double quotes you can use something like this:

if string.startswith('"') and string.endswith('"'):
    string = string[1:-1]


I'm sure that you just used string as the variable name for exemplification here and in your real code it has a useful name, but I feel obliged to warn you that there is a module named string in the standard libraries. It's not loaded automatically, but if you ever use import string make sure your variable doesn't eclipse it.

How to do URL decoding in Java?


public class URLDecoding { 

    String decoded = "";

    public String decodeMethod(String url) throws UnsupportedEncodingException
        decoded =, "UTF-8"); 
        return  decoded;
//"You should use to do this, as the URLDecoder class does x-www-form-urlencoded decoding which is wrong (despite the name, it's for form data)."

    public String getPathMethod(String url) throws URISyntaxException 
        decoded = new;  
        return  decoded; 

    public static void main(String[] args) throws UnsupportedEncodingException, URISyntaxException 
        System.out.println(" Here is your Decoded url with decode method : "+ new URLDecoding().decodeMethod("")); 
        System.out.println("Here is your Decoded url with getPath method : "+ new URLDecoding().getPathMethod("")); 



You can select your method wisely :)

Loading state button in Bootstrap 3

You need to detect the click from js side, your HTML remaining same. Note: this method is deprecated since v3.5.5 and removed in v4.

$("button").click(function() {
    var $btn = $(this);
    // simulating a timeout
    setTimeout(function () {
    }, 1000);

Also, don't forget to load jQuery and Bootstrap js (based on jQuery) file in your page.


Official Documentation

How can I initialize a MySQL database with schema in a Docker container?

For the ones not wanting to create an entrypoint script like me, you actually can start mysqld at build-time and then execute the mysql commands in your Dockerfile like so:

RUN mysqld_safe & until mysqladmin ping; do sleep 1; done && \
    mysql -uroot -e "CREATE DATABASE somedb;" && \
    mysql -uroot -e "CREATE USER 'someuser'@'localhost' IDENTIFIED BY 'somepassword';" && \
    mysql -uroot -e "GRANT ALL PRIVILEGES ON somedb.* TO 'someuser'@'localhost';"

The key here is to send mysqld_safe to background with the single & sign.

Apache: Restrict access to specific source IP inside virtual host

If you are using apache 2.2 inside your virtual host you should add following directive (mod_authz_host):

Order deny,allow
Deny from all
Allow from

You can even specify a subnet

Allow from 10.0.0

Apache 2.4 looks like a little different as configuration. Maybe better you specify which version of apache are you using.

Reading a string with scanf

An array "decays" into a pointer to its first element, so scanf("%s", string) is equivalent to scanf("%s", &string[0]). On the other hand, scanf("%s", &string) passes a pointer-to-char[256], but it points to the same place.

Then scanf, when processing the tail of its argument list, will try to pull out a char *. That's the Right Thing when you've passed in string or &string[0], but when you've passed in &string you're depending on something that the language standard doesn't guarantee, namely that the pointers &string and &string[0] -- pointers to objects of different types and sizes that start at the same place -- are represented the same way.

I don't believe I've ever encountered a system on which that doesn't work, and in practice you're probably safe. None the less, it's wrong, and it could fail on some platforms. (Hypothetical example: a "debugging" implementation that includes type information with every pointer. I think the C implementation on the Symbolics "Lisp Machines" did something like this.)

jquery live hover

$('.hoverme').live('mouseover mouseout', function(event) {
  if (event.type == 'mouseover') {
    // do something on mouseover
  } else {
    // do something on mouseout

How do I connect to a MySQL Database in Python?

Try using MySQLdb. MySQLdb only supports Python 2.

There is a how to page here:

From the page:

# - retrieve and display database server version

import MySQLdb

conn = MySQLdb.connect (host = "localhost",
                        user = "testuser",
                        passwd = "testpass",
                        db = "test")
cursor = conn.cursor ()
cursor.execute ("SELECT VERSION()")
row = cursor.fetchone ()
print "server version:", row[0]
cursor.close ()
conn.close ()

How to create user for a db in postgresql?

Create the user with a password :

CREATE USER name [ [ WITH ] option [ ... ] ]

where option can be:

    | CONNECTION LIMIT connlimit
    | VALID UNTIL 'timestamp'
    | IN ROLE role_name [, ...]
    | IN GROUP role_name [, ...]
    | ROLE role_name [, ...]
    | ADMIN role_name [, ...]
    | USER role_name [, ...]
    | SYSID uid

Then grant the user rights on a specific database :

Example :

grant all privileges on database db_name to someuser;

How can apply multiple background color to one div

With :after and :before you can do that.


<div class="a"> </div>
<div class="b"> </div>
<div class="c"> </div>


div {
    height: 100px;
    position: relative;
.a {
    background: #9C9E9F;
.b {
    background: linear-gradient(to right, #9c9e9f, #f6f6f6);
.a:after, .c:before, .c:after {
    content: '';
    width: 50%;
    height: 100%;
    top: 0;
    right: 0;
    display: block;
    position: absolute;
.a:after {
    background: #f6f6f6;    
.c:before {
    background: #9c9e9f;
    left: 0;
.c:after {
    background: #33CCFF;
    right: 0;
    height: 80%;

And a demo.

How to set the java.library.path from Eclipse

Click Run
Click Debug ...
New Java Application
Click Arguments tab
in the 2nd box (VM Arguments) add the -D entry

-Xdebug -verbose:gc -Xbootclasspath/p:jar/vbjorb.jar;jar/oracle9.jar;classes;jar/mq.jar;jar/xml4j.jar -classpath -DORBInitRef=NameService=iioploc://  


Remove blank lines with grep

Using Perl:

perl -ne 'print if /\S/'

\S means match non-blank characters.

Check if an image is loaded (no errors) with jQuery

Retrieve informations from image elements on the page
Test working on Chrome and Firefox
Working jsFiddle (open your console to see the result)

$('img').each(function(){ // selecting all image element on the page

    var img = new Image($(this)); // creating image element

    img.onload = function() { // trigger if the image was loaded
        console.log($(this).attr('src') + ' - done!');

    img.onerror = function() { // trigger if the image wasn't loaded
        console.log($(this).attr('src') + ' - error!');

    img.onAbort = function() { // trigger if the image load was abort
        console.log($(this).attr('src') + ' - abort!');

    img.src = $(this).attr('src'); // pass src to image object

    // log image attributes


Note : I used jQuery, I thought this can be acheive on full javascript

I find good information here OpenClassRoom --> this is a French forum

redirect COPY of stdout to log file from within bash script itself

Neither of these is a perfect solution, but here are a couple things you could try:

exec >foo.log
tail -f foo.log &
# rest of your script


mkfifo $PIPE
exec >$PIPE
tee foo.log <$PIPE &
# rest of your script
rm $PIPE

The second one would leave a pipe file sitting around if something goes wrong with your script, which may or may not be a problem (i.e. maybe you could rm it in the parent shell afterwards).

How do I tidy up an HTML file's indentation in VI?

There's several things that all need to be in place. Just to summarize them all in one location:

Set the following option:

:filetype indent on
:set filetype=html           # abbrev -  :set ft=html
:set smartindent             # abbrev -  :set si

Then either move the cursor to the top of the file and indent to the end: gg =G
Or select the desired text to indent and hit = to indent it.

Does SVG support embedding of bitmap images?

It is also possible to include bitmaps. I think you also can use transformations on that.

How can I rename a single column in a table at select?

select table1.price, table2.price as other_price .....

How can I format a nullable DateTime with ToString()?

You can use dt2.Value.ToString("format"), but of course that requires that dt2 != null, and that negates th use of a nullable type in the first place.

There are several solutions here, but the big question is: How do you want to format a null date?

Parse a URI String into Name-Value Collection

On Android, there is a Uri class in package . Note that Uri is part of, while URI is part of .

Uri class has many functions to extract key-value pairs from a query. enter image description here

Following function returns key-value pairs in the form of HashMap.

In Java:

Map<String, String> getQueryKeyValueMap(Uri uri){
    HashMap<String, String> keyValueMap = new HashMap();
    String key;
    String value;

    Set<String> keyNamesList = uri.getQueryParameterNames();
    Iterator iterator = keyNamesList.iterator();

    while (iterator.hasNext()){
        key = (String);
        value = uri.getQueryParameter(key);
        keyValueMap.put(key, value);
    return keyValueMap;

In Kotlin:

fun getQueryKeyValueMap(uri: Uri): HashMap<String, String> {
        val keyValueMap = HashMap<String, String>()
        var key: String
        var value: String

        val keyNamesList = uri.queryParameterNames
        val iterator = keyNamesList.iterator()

        while (iterator.hasNext()) {
            key = as String
            value = uri.getQueryParameter(key) as String
            keyValueMap.put(key, value)
        return keyValueMap

How can I save multiple documents concurrently in Mongoose/Node.js?

Here is another way without using additional libraries (no error checking included)

function saveAll( callback ){
  var count = 0;
          if( count == docs.length ){

How do I tell Maven to use the latest version of a dependency?


The mentioned LATEST and RELEASE metaversions have been dropped for plugin dependencies in Maven 3 "for the sake of reproducible builds", over 6 years ago. (They still work perfectly fine for regular dependencies.) For plugin dependencies please refer to this Maven 3 compliant solution.

If you always want to use the newest version, Maven has two keywords you can use as an alternative to version ranges. You should use these options with care as you are no longer in control of the plugins/dependencies you are using.

When you depend on a plugin or a dependency, you can use the a version value of LATEST or RELEASE. LATEST refers to the latest released or snapshot version of a particular artifact, the most recently deployed artifact in a particular repository. RELEASE refers to the last non-snapshot release in the repository. In general, it is not a best practice to design software which depends on a non-specific version of an artifact. If you are developing software, you might want to use RELEASE or LATEST as a convenience so that you don't have to update version numbers when a new release of a third-party library is released. When you release software, you should always make sure that your project depends on specific versions to reduce the chances of your build or your project being affected by a software release not under your control. Use LATEST and RELEASE with caution, if at all.

See the POM Syntax section of the Maven book for more details. Or see this doc on Dependency Version Ranges, where:

  • A square bracket ( [ & ] ) means "closed" (inclusive).
  • A parenthesis ( ( & ) ) means "open" (exclusive).

Here's an example illustrating the various options. In the Maven repository, has the following metadata:

<?xml version="1.0" encoding="UTF-8"?><metadata>

If a dependency on that artifact is required, you have the following options (other version ranges can be specified of course, just showing the relevant ones here):

Declare an exact version (will always resolve to 1.0.1):


Declare an explicit version (will always resolve to 1.0.1 unless a collision occurs, when Maven will select a matching version):


Declare a version range for all 1.x (will currently resolve to 1.1.1):


Declare an open-ended version range (will resolve to 2.0.0):


Declare the version as LATEST (will resolve to 2.0.0) (removed from maven 3.x)


Declare the version as RELEASE (will resolve to 1.1.1) (removed from maven 3.x):


Note that by default your own deployments will update the "latest" entry in the Maven metadata, but to update the "release" entry, you need to activate the "release-profile" from the Maven super POM. You can do this with either "-Prelease-profile" or "-DperformRelease=true"

It's worth emphasising that any approach that allows Maven to pick the dependency versions (LATEST, RELEASE, and version ranges) can leave you open to build time issues, as later versions can have different behaviour (for example the dependency plugin has previously switched a default value from true to false, with confusing results).

It is therefore generally a good idea to define exact versions in releases. As Tim's answer points out, the maven-versions-plugin is a handy tool for updating dependency versions, particularly the versions:use-latest-versions and versions:use-latest-releases goals.

AddRange to a Collection

Here is a bit more advanced/production-ready version:

    public static class CollectionExtensions
        public static TCol AddRange<TCol, TItem>(this TCol destination, IEnumerable<TItem> source)
            where TCol : ICollection<TItem>
            if(destination == null) throw new ArgumentNullException(nameof(destination));
            if(source == null) throw new ArgumentNullException(nameof(source));

            // don't cast to IList to prevent recursion
            if (destination is List<TItem> list)
                return destination;

            foreach (var item in source)

            return destination;

How to configure SMTP settings in web.config

Set IIS to forward your mail to the remote server. The specifics vary greatly depending on the version of IIS. For IIS 7.5:

  1. Open IIS Manager
  2. Connect to your server if needed
  3. Select the server node; you should see an SMTP option on the right in the ASP.NET section
  4. Double-click the SMTP icon.
  5. Select the "Deliver e-mail to SMTP server" option and enter your server name, credentials, etc.

Excel - Button to go to a certain sheet

You have to add Button to excel sheet(say sheet1) from which you can go to another sheet(say sheet2).

Button can be added from Developer tab in excel. If developer tab is not there follow below steps to enable.

GOTO file -> options -> Customize Ribbon -> enable checkbox of developer on right panel -> Done.

To Add button :-

Developer Tab -> Insert -> choose first item button -> choose location of button-> Done.

To give name for button :-

Right click on button -> edit text.

To add code for going to sheet2 :-

Right click on button -> Assign Macro -> New -> (microsoft visual basic will open to code for button) -> paste below code

Worksheets("Sheet2").Visible = True

Save the file using 'Excel Macro Enable Template(*.xltm)' By which the code is appended with excel sheet.

How do I get the file name from a String containing the Absolute file path?

Considering the String you're asking about is

C:\Hello\AnotherFolder\The File Name.PDF

we need to extract everything after the last separator, ie. \. That is what we are interested in.

You can do

String fullPath = "C:\\Hello\\AnotherFolder\\The File Name.PDF";
int index = fullPath.lastIndexOf("\\");
String fileName = fullPath.substring(index + 1);

This will retrieve the index of the last \ in your String and extract everything that comes after it into fileName.

If you have a String with a different separator, adjust the lastIndexOf to use that separator. (There's even an overload that accepts an entire String as a separator.)

I've omitted it in the example above, but if you're unsure where the String comes from or what it might contain, you'll want to validate that the lastIndexOf returns a non-negative value because the Javadoc states it'll return

-1 if there is no such occurrence

How to install Java SDK on CentOS?

On centos 7, I just do

sudo yum install java-sdk

I assume you have most common repo already. Centos just finds the correct SDK with the -devel sufix.

How do I write a compareTo method which compares objects?

I wouldn't have an Object type parameter, no point in casting it to Student if we know it will always be type Student.

As for an explanation, "result == 0" will only occur when the last names are identical, at which point we compare the first names and return that value instead.

public int Compare(Object obj)
    Student student = (Student) obj;
    int result = this.getLastName().compareTo( student.getLastName() );

    if ( result == 0 )
        result = this.getFirstName().compareTo( student.getFirstName() );

    return result;

How can I check for "undefined" in JavaScript?

    var x;
    if (x === undefined) {
        alert ("I am declared, but not defined.")
    if (typeof y === "undefined") {
        alert ("I am not even declared.")

    /* One more thing to understand: typeof ==='undefined' also checks 
       for if a variable is declared, but no value is assigned. In other 
       words, the variable is declared, but not defined. */

    // Will repeat above logic of x for typeof === 'undefined'
    if (x === undefined) {
        alert ("I am declared, but not defined.")
    /* So typeof === 'undefined' works for both, but x === undefined 
       only works for a variable which is at least declared. */

    /* Say if I try using typeof === undefined (not in quotes) for 
       a variable which is not even declared, we will get run a 
       time error. */

    if (z === undefined) {
        alert ("I am neither declared nor defined.")
    // I got this error for z ReferenceError: z is not defined 

How to query MongoDB with "like"?

For PHP mongo Like.
I had several issues with php mongo like. i found that concatenating the regex params helps in some situations PHP mongo find field starts with. I figured I would post on here to contribute to the more popular thread


db()->users->insert(['name' => 'john']);
db()->users->insert(['name' => 'joe']);
db()->users->insert(['name' => 'jason']);

// starts with
$like_var = 'jo';
$prefix = '/^';
$suffix = '/';
$name = $prefix . $like_var . $suffix;
db()->users->find(['name' => array('$regex'=>new MongoRegex($name))]);
output: (joe, john)

// contains
$like_var = 'j';
$prefix = '/';
$suffix = '/';
$name = $prefix . $like_var . $suffix;
db()->users->find(['name' => array('$regex'=>new MongoRegex($name))]);

output: (joe, john, jason)

How to read file from relative path in Java project? cannot find the path specified

If it's already in the classpath, then just obtain it from the classpath instead of from the disk file system. Don't fiddle with relative paths in They are dependent on the current working directory over which you have totally no control from inside the Java code.

Assuming that ListStopWords.txt is in the same package as your FileLoader class, then do:

URL url = getClass().getResource("ListStopWords.txt");
File file = new File(url.getPath());

Or if all you're ultimately after is actually an InputStream of it:

InputStream input = getClass().getResourceAsStream("ListStopWords.txt");

This is certainly preferred over creating a new File() because the url may not necessarily represent a disk file system path, but it could also represent virtual file system path (which may happen when the JAR is expanded into memory instead of into a temp folder on disk file system) or even a network path which are both not per definition digestable by File constructor.

If the file is -as the package name hints- is actually a fullworthy properties file (containing key=value lines) with just the "wrong" extension, then you could feed the InputStream immediately to the load() method.

Properties properties = new Properties();

Note: when you're trying to access it from inside static context, then use FileLoader.class (or whatever YourClass.class) instead of getClass() in above examples.

How to detect when an Android app goes to the background and come back to the foreground

By using below code I'm able to get my app foreground or background state.

For more detail about it's working, strong text click here

import android.content.ComponentCallbacks2;
import android.content.Context;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

private Context context;
private Toast toast;

protected void onCreate(Bundle savedInstanceState) {
    context = this;

private void showToast(String message) {
    //If toast is already showing cancel it
    if (toast != null) {

    toast = Toast.makeText(context, message, Toast.LENGTH_SHORT);;

protected void onStart() {
    showToast("App In Foreground");

public void onTrimMemory(int level) {
    if (level == ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN) {
        showToast("App In Background");

How to gracefully handle the SIGKILL signal in Java

It is impossible for any program, in any language, to handle a SIGKILL. This is so it is always possible to terminate a program, even if the program is buggy or malicious. But SIGKILL is not the only means for terminating a program. The other is to use a SIGTERM. Programs can handle that signal. The program should handle the signal by doing a controlled, but rapid, shutdown. When a computer shuts down, the final stage of the shutdown process sends every remaining process a SIGTERM, gives those processes a few seconds grace, then sends them a SIGKILL.

The way to handle this for anything other than kill -9 would be to register a shutdown hook. If you can use (SIGTERM) kill -15 the shutdown hook will work. (SIGINT) kill -2 DOES cause the program to gracefully exit and run the shutdown hooks.

Registers a new virtual-machine shutdown hook.

The Java virtual machine shuts down in response to two kinds of events:

  • The program exits normally, when the last non-daemon thread exits or when the exit (equivalently, System.exit) method is invoked, or
  • The virtual machine is terminated in response to a user interrupt, such as typing ^C, or a system-wide event, such as user logoff or system shutdown.

I tried the following test program on OSX 10.6.3 and on kill -9 it did NOT run the shutdown hook, as expected. On a kill -15 it DOES run the shutdown hook every time.

public class TestShutdownHook
    public static void main(String[] args) throws InterruptedException
        Runtime.getRuntime().addShutdownHook(new Thread()
            public void run()
                System.out.println("Shutdown hook ran!");

        while (true)

There isn't any way to really gracefully handle a kill -9 in any program.

In rare circumstances the virtual machine may abort, that is, stop running without shutting down cleanly. This occurs when the virtual machine is terminated externally, for example with the SIGKILL signal on Unix or the TerminateProcess call on Microsoft Windows.

The only real option to handle a kill -9 is to have another watcher program watch for your main program to go away or use a wrapper script. You could do with this with a shell script that polled the ps command looking for your program in the list and act accordingly when it disappeared.

#!/usr/bin/env bash

java TestShutdownHook
# notify your other app that you quit
echo "TestShutdownHook quit"

curl Failed to connect to localhost port 80

I also had problem with refused connection on port 80. I didn't use localhost.

curl --data-binary "@/textfile.txt" ""

Problem was that I had umlauts äåö in my textfile.txt.

Best Practices for securing a REST API / web service

REST itself offers no security standards, but things like OAuth and SAML are rapidly becoming the standards in this space. However, authentication and authorization are only a small part of what you need to consider. Many of the known vulnerabilities relating to web applications apply very much to REST apis. You have to consider input validation, session cracking, inappropriate error messages, internal employee vulnerabilities and so on. It is a big subject.

How to convert an array of key-value tuples into an object

I much more recommend you to use ES6 with it's perfect Object.assign() method.

Object.assign({},[ key, value ]) => ({ [key]: value })));

What happening here - Object.assign() do nothing but take key:value from donating object and puts pair in your result. In this case I'm using ... to split new array to multiply pairs (after map it looks like [{'cardType':'iDEBIT'}, ... ]). So in the end, new {} receives every key:property from each pair from mapped array.

Dialog to pick image from gallery or from camera

I have merged some solutions to make a complete util for picking an image from Gallery or Camera. These are the features of ImagePicker util gist (also in a Github lib):

  • Merged intents for Gallery and Camera resquests.
  • Resize selected big images (e.g.: 2500 x 1600)
  • Rotate image if necesary


ImagePicker starting intent

Edit: Here is a fragment of code to get a merged Intent for Gallery and Camera apps together. You can see the full code at ImagePicker util gist (also in a Github lib):

public static Intent getPickImageIntent(Context context) {
    Intent chooserIntent = null;

    List<Intent> intentList = new ArrayList<>();

    Intent pickIntent = new Intent(Intent.ACTION_PICK,
    Intent takePhotoIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    takePhotoIntent.putExtra("return-data", true);
    takePhotoIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(getTempFile(context)));
    intentList = addIntentsToList(context, intentList, pickIntent);
    intentList = addIntentsToList(context, intentList, takePhotoIntent);

    if (intentList.size() > 0) {
        chooserIntent = Intent.createChooser(intentList.remove(intentList.size() - 1),
        chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentList.toArray(new Parcelable[]{}));

    return chooserIntent;

private static List<Intent> addIntentsToList(Context context, List<Intent> list, Intent intent) {
    List<ResolveInfo> resInfo = context.getPackageManager().queryIntentActivities(intent, 0);
    for (ResolveInfo resolveInfo : resInfo) {
        String packageName = resolveInfo.activityInfo.packageName;
        Intent targetedIntent = new Intent(intent);
    return list;

When is assembly faster than C?

Longpoke, there is just one limitation: time. When you don't have the resources to optimize every single change to code and spend your time allocating registers, optimize few spills away and what not, the compiler will win every single time. You do your modification to the code, recompile and measure. Repeat if necessary.

Also, you can do a lot in the high-level side. Also, inspecting the resulting assembly may give the IMPRESSION that the code is crap, but in practice it will run faster than what you think would be quicker. Example:

int y = data[i]; // do some stuff here.. call_function(y, ...);

The compiler will read the data, push it to stack (spill) and later read from stack and pass as argument. Sounds shite? It might actually be very effective latency compensation and result in faster runtime.

// optimized version call_function(data[i], ...); // not so optimized after all..

The idea with the optimized version was, that we have reduced register pressure and avoid spilling. But in truth, the "shitty" version was faster!

Looking at the assembly code, just looking at the instructions and concluding: more instructions, slower, would be a misjudgment.

The thing here to pay attention is: many assembly experts think they know a lot, but know very little. The rules change from architecture to next, too. There is no silver-bullet x86 code, for example, which is always the fastest. These days is better to go by rules-of-thumb:

  • memory is slow
  • cache is fast
  • try to use cached better
  • how often you going to miss? do you have latency compensation strategy?
  • you can execute 10-100 ALU/FPU/SSE instructions for one single cache miss
  • application architecture is important..
  • .. but it does't help when the problem isn't in the architecture

Also, trusting too much into compiler magically transforming poorly-thought-out C/C++ code into "theoretically optimum" code is wishful thinking. You have to know the compiler and tool chain you use if you care about "performance" at this low-level.

Compilers in C/C++ are generally not very good at re-ordering sub-expressions because the functions have side effects, for starters. Functional languages don't suffer from this caveat but don't fit the current ecosystem that well. There are compiler options to allow relaxed precision rules which allow order of operations to be changed by the compiler/linker/code generator.

This topic is a bit of a dead-end; for most it's not relevant, and the rest, they know what they are doing already anyway.

It all boils down to this: "to understand what you are doing", it's a bit different from knowing what you are doing.

Getting attribute using XPath

The standard formula to extract the values of attribute using XPath is


So here is the xpath to fetch the lang value of first attribute-

//title[text()='Harry Potter']/@lang

PS: indexes are never suggested to use in XPath as they can change if one more title tag comes in.

Adding image inside table cell in HTML

You have referenced the image as a path on your computer (C:\etc\etc) it located there? You didn't answer what others have asked. I have taken your code, placed it in dreamweaver and it works apart from the image as I don't have that stored.

Check the location and then let us know.

How to set up Spark on Windows?

Trying to work with spark-2.x.x, building Spark source code didn't work for me.

  1. So, although I'm not going to use Hadoop, I downloaded the pre-built Spark with hadoop embeded : spark-2.0.0-bin-hadoop2.7.tar.gz

  2. Point SPARK_HOME on the extracted directory, then add to PATH: ;%SPARK_HOME%\bin;

  3. Download the executable winutils from the Hortonworks repository, or from Amazon AWS platform winutils.

  4. Create a directory where you place the executable winutils.exe. For example, C:\SparkDev\x64. Add the environment variable %HADOOP_HOME% which points to this directory, then add %HADOOP_HOME%\bin to PATH.

  5. Using command line, create the directory:

    mkdir C:\tmp\hive
  6. Using the executable that you downloaded, add full permissions to the file directory you created but using the unixian formalism:

    %HADOOP_HOME%\bin\winutils.exe chmod 777 /tmp/hive
  7. Type the following command line:


Scala command line input should be shown automatically.

Remark : You don't need to configure Scala separately. It's built-in too.

How do I measure a time interval in C?

High resolution timers that provide a resolution of 1 microsecond are system-specific, so you will have to use different methods to achieve this on different OS platforms. You may be interested in checking out the following article, which implements a cross-platform C++ timer class based on the functions described below:

  • [Song Ho Ahn - High Resolution Timer][1]


The Windows API provides extremely high resolution timer functions: QueryPerformanceCounter(), which returns the current elapsed ticks, and QueryPerformanceFrequency(), which returns the number of ticks per second.


#include <stdio.h>
#include <windows.h>                // for Windows APIs

int main(void)
    LARGE_INTEGER frequency;        // ticks per second
    LARGE_INTEGER t1, t2;           // ticks
    double elapsedTime;

    // get ticks per second

    // start timer

    // do something
    // ...

    // stop timer

    // compute and print the elapsed time in millisec
    elapsedTime = (t2.QuadPart - t1.QuadPart) * 1000.0 / frequency.QuadPart;
    printf("%f ms.\n", elapsedTime);

Linux, Unix, and Mac

For Unix or Linux based system, you can use gettimeofday(). This function is declared in "sys/time.h".


#include <stdio.h>
#include <sys/time.h>                // for gettimeofday()

int main(void)
    struct timeval t1, t2;
    double elapsedTime;

    // start timer
    gettimeofday(&t1, NULL);

    // do something
    // ...

    // stop timer
    gettimeofday(&t2, NULL);

    // compute and print the elapsed time in millisec
    elapsedTime = (t2.tv_sec - t1.tv_sec) * 1000.0;      // sec to ms
    elapsedTime += (t2.tv_usec - t1.tv_usec) / 1000.0;   // us to ms
    printf("%f ms.\n", elapsedTime);

Change app language programmatically in Android

Take note that this solution using updateConfiguration will not be working anymore with the Android M release coming in a few weeks. The new way to do this is now using the applyOverrideConfigurationmethod from ContextThemeWrapper see API doc

You can find my full solution here since I faced the problem myself:

Can you style html form buttons with css?

Yeah, it's pretty simple:

  background: #fff;
  border: 1px solid #000;
  text-shadow: 1px 1px 1px #000;

I recommend giving it an ID or a class so that you can target it more easily.

JavaScript: how to change form action attribute value based on selection?

$("#selectsearch").change(function() {
  var action = $(this).val() == "people" ? "user" : "content";
  $("#search-form").attr("action", "/search/" + action);

Display text on MouseOver for image in html

You can do like this also:


<a><img src='' onmouseover="somefunction();"></a>

In javascript:

function somefunction()
  //Do somethisg.


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

If you and I each walk into the bank, each open a brand new account, and each deposit $100, then...

  1. myAccount.equals(yourAccount) is true because they have the same value, but
  2. myAccount == yourAccount is false because they are not the same account.

(Assuming appropriate definitions of the Account class, of course. ;-)

Solving Quadratic Equation

Below is the Program to Solve Quadratic Equation.

For Example: Solve x2 + 3x – 4 = 0

This quadratic happens to factor:

x2 + 3x – 4 = (x + 4)(x – 1) = 0

we already know that the solutions are x = –4 and x = 1.

enter image description here

    # import complex math module
    import cmath

    a = 1
    b = 5
    c = 6

    # To take coefficient input from the users
    # a = float(input('Enter a: '))
    # b = float(input('Enter b: '))
    # c = float(input('Enter c: '))

    # calculate the discriminant
    d = (b**2) - (4*a*c)

    # find two solutions
    sol1 = (-b-cmath.sqrt(d))/(2*a)
    sol2 = (-b+cmath.sqrt(d))/(2*a)

    print('The solution are {0} and {1}'.format(sol1,sol2))

Source: Python Program to Solve Quadratic Equation

Get values from a listbox on a sheet

The accepted answer doesn't cut it because if a user de-selects a row the list is not updated accordingly.

Here is what I suggest instead:

Private Sub CommandButton2_Click()
    Dim lItem As Long

    For lItem = 0 To ListBox1.ListCount - 1
        If ListBox1.Selected(lItem) = True Then
        End If
End Sub

Courtesy of

Date in mmm yyyy format in postgresql

DateAndTime Reformat:

SELECT *, to_char( last_update, 'DD-MON-YYYY') as re_format from actor;


enter image description here

Postgresql tables exists, but getting "relation does not exist" when querying

I hit this error and it turned out my connection string was pointing to another database, obviously the table didn't exist there.

I spent a few hours on this and no one else has mentioned to double check your connection string.

Get Insert Statement for existing row in MySQL

If you want get "insert statement" for your table you can try the following code.

                'INSERT INTO `your_table` (`field_1`, `field_2`, `...`, `field_n`) VALUES ("',
                '", "',
                '", "',
                '", "',
            ) SEPARATOR ';\n'
        ), ';'
    ) as `QUERY`
FROM `your_table`;

As a result, you will have insers statement:

INSERT INTO your_table (field_1, field_2, ..., field_n) VALUES (value_11, value_12, ... , value_1n);

INSERT INTO your_table (field_1, field_2, ..., field_n) VALUES (value_21, value_22, ... , value_2n);


INSERT INTO your_table (field_1, field_2, ..., field_n) VALUES (value_m1, value_m2, ... , value_mn);

, where m - number of records in your_table

Unable to Resolve Module in React Native App

I'm using react-native CLI and I just restart rn-cli, ctrl+c to stop the process then npx react-native start

Difference between staticmethod and classmethod

Analyze @staticmethod literally providing different insights.

A normal method of a class is an implicit dynamic method which takes the instance as first argument.
In contrast, a staticmethod does not take the instance as first argument, so is called 'static'.

A staticmethod is indeed such a normal function the same as those outside a class definition.
It is luckily grouped into the class just in order to stand closer where it is applied, or you might scroll around to find it.

C# An established connection was aborted by the software in your host machine

An established connection was aborted by the software in your host machine

That is a boiler-plate error message, it comes out of Windows. The underlying error code is WSAECONNABORTED. Which really doesn't mean more than "connection was aborted". You have to be a bit careful about the "your host machine" part of the phrase. In the vast majority of Windows application programs, it is indeed the host that the desktop app is connected to that aborted the connection. Usually a server somewhere else.

The roles are reversed however when you implement your own server. Now you need to read the error message as "aborted by the application at the other end of the wire". Which is of course not uncommon when you implement a server, client programs that use your server are not unlikely to abort a connection for whatever reason. It can mean that a fire-wall or a proxy terminated the connection but that's not very likely since they typically would not allow the connection to be established in the first place.

You don't really know why a connection was aborted unless you have insight what is going on at the other end of the wire. That's of course hard to come by. If your server is reachable through the Internet then don't discount the possibility that you are being probed by a port scanner. Or your customers, looking for a game cheat.

This Activity already has an action bar supplied by the window decor

Add this two line in your app theme located in style.xml:-

 <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>

    //Add this two line will fix your problem
    <item name="windowNoTitle">true</item>   <--1(this applies after 22.0.1 support library i think 
    <item name="windowActionBar">true</item> <--2

How to convert DOS/Windows newline (CRLF) to Unix newline (LF) in a Bash script?

tr -d "\r" < file

take a look here for examples using sed:

# IN UNIX ENVIRONMENT: convert DOS newlines (CR/LF) to Unix format.
sed 's/.$//'               # assumes that all lines end with CR/LF
sed 's/^M$//'              # in bash/tcsh, press Ctrl-V then Ctrl-M
sed 's/\x0D$//'            # works on ssed, gsed 3.02.80 or higher

# IN UNIX ENVIRONMENT: convert Unix newlines (LF) to DOS format.
sed "s/$/`echo -e \\\r`/"            # command line under ksh
sed 's/$'"/`echo \\\r`/"             # command line under bash
sed "s/$/`echo \\\r`/"               # command line under zsh
sed 's/$/\r/'                        # gsed 3.02.80 or higher

Use sed -i for in-place conversion e.g. sed -i 's/..../' file.

How to set the title text color of UIButton?

You have to use func setTitleColor(_ color: UIColor?, for state: UIControlState) the same way you set the actual title text. Docs

isbeauty.setTitleColor(UIColorFromRGB("F21B3F"), for: .normal)

(XML) The markup in the document following the root element must be well-formed. Start location: 6:2

In XML there can be only one root element - you have two - heading and song.

If you restructure to something like:

<?xml version="1.0" encoding="UTF-8"?>
 The Twelve Days of Christmas

The error about well-formed XML on the root level should disappear (though there may be other issues).

How to exit a 'git status' list in a terminal?

Type 'q' and it will do the job.

Whenever you are at the terminal and have a similar predicament keep in mind also to try and type 'quit', 'exit' as well as the abort key combination 'Ctrl + C'.

How to convert an array into an object using stdClass()

One of the easiest solution is

$objectData = (object) $arrayData

How to make a section of an image a clickable link

The easiest way is to make the "button image" as a separate image. Then place it over the main image (using "style="position: absolute;". Assign the URL link to "button image". and smile :)

How and where are Annotations used in Java?

Annotations in Java, provide a mean to describe classes, fields and methods. Essentially, they are a form of metadata added to a Java source file, they can't affect the semantics of a program directly. However, annotations can be read at run-time using Reflection & this process is known as Introspection. Then it could be used to modify classes, fields or methods.

This feature, is often exploited by Libraries & SDKs (hibernate, JUnit, Spring Framework) to simplify or reduce the amount of code that a programmer would unless do in orer to work with these Libraries or SDKs.Therefore, it's fair to say Annotations and Reflection work hand-in hand in Java.

We also get to limit the availability of an annotation to either compile-time or runtime.Below is a simple example on creating a custom annotation

package io.hamzeen;

import java.lang.annotation.Annotation;

public class Driver {

    public static void main(String[] args) {
        Class<TestAlpha> obj = TestAlpha.class;
        if (obj.isAnnotationPresent(IssueInfo.class)) {

            Annotation annotation = obj.getAnnotation(IssueInfo.class);
            IssueInfo testerInfo = (IssueInfo) annotation;

            System.out.printf("%nType: %s", testerInfo.type());
            System.out.printf("%nReporter: %s", testerInfo.reporter());
            System.out.printf("%nCreated On: %s%n%n",

package io.hamzeen;

import io.hamzeen.IssueInfo;
import io.hamzeen.IssueInfo.Type;

@IssueInfo(type = Type.IMPROVEMENT, reporter = "Hamzeen. H.")
public class TestAlpha {


package io.hamzeen;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

 * @author Hamzeen. H.
 * @created 10/01/2015
 * IssueInfo annotation definition
public @interface IssueInfo {

    public enum Type {

    Type type() default Type.BUG;

    String reporter() default "Vimesh";

    String created() default "10/01/2015";

Material UI and Grid system

The way I do is go to and only check "grid system" to download. There are bootstrap-theme.css and bootstrap.css in downloaded files, and I only need the latter.

In this way, I can use the grid system of Bootstrap, with everything else from Material UI.

How to convert string to XML using C#

Use LoadXml Method of XmlDocument;

string xml = "<head><body><Inner> welcome </head> </Inner> <Outer> Bye</Outer></body></head>";

How do I iterate through children elements of a div using jQuery?

Use children() and each(), you can optionally pass a selector to children

$('#mydiv').children('input').each(function () {
    alert(this.value); // "this" is the current element in the loop

You could also just use the immediate child selector:

$('#mydiv > input').each(function () { /* ... */ });

Laravel 5.1 API Enable Cors

After wasting a lot of time I finally found this silly mistake which might help you as well.

If you can't return response from your route either through function closure or through controller action then it won't work.



Route::post('login', function () {
    return response()->json(['key' => 'value'], 200); //Make sure your response is there.

Controller Action


class AuthController extends Controller {


     public function login() {
          return response()->json(['key' => 'value'], 200); //Make sure your response is there.




Chrome -> Developer Tools -> Network tab

enter image description here

If anything goes wrong then your response headers won't be here.

URL to load resources from the classpath in Java

From Java 9+ and up, you can define a new URLStreamHandlerProvider. The URL class uses the service loader framework to load it at run time.

Create a provider:

package org.example;


public class ClasspathURLStreamHandlerProvider extends URLStreamHandlerProvider {

    public URLStreamHandler createURLStreamHandler(String protocol) {
        if ("classpath".equals(protocol)) {
            return new URLStreamHandler() {
                protected URLConnection openConnection(URL u) throws IOException {
                    return ClassLoader.getSystemClassLoader().getResource(u.getPath()).openConnection();
        return null;


Create a file called in the META-INF/services directory with the contents:


Now the URL class will use the provider when it sees something like:

URL url = new URL("classpath:myfile.txt");

error: expected primary-expression before ')' token (C)

You're passing a type as an argument, not an object. You need to do characterSelection(screen, test); where test is of type SelectionneNonSelectionne.

Add Variables to Tuple

Tuples are immutable; you can't change which variables they contain after construction. However, you can concatenate or slice them to form new tuples:

a = (1, 2, 3)
b = a + (4, 5, 6)  # (1, 2, 3, 4, 5, 6)
c = b[1:]  # (2, 3, 4, 5, 6)

And, of course, build them from existing values:

name = "Joe"
age = 40
location = "New York"
joe = (name, age, location)

"code ." Not working in Command Line for Visual Studio Code on OSX/Mac

Define the path of the Visual Studio in your ~/.bash_profile as follow

export PATH="$PATH:/Applications/Visual Studio"

Position absolute and overflow hidden

An absolutely positioned element is actually positioned regarding a relative parent, or the nearest found relative parent. So the element with overflow: hidden should be between relative and absolute positioned elements:

<div class="relative-parent">
  <div class="hiding-parent">
    <div class="child"></div>

.relative-parent {
.hiding-parent {
.child {

How do I register a .NET DLL file in the GAC?

You'll need:

  • Strong name your assembly (Visual Studio, Project Properties, Signing tab, Sign the assembly)
  • Alter your Build Events (Project Properties, Build Events tab, Post-build command line)
   cd C:\Program Files\Microsoft Visual Studio 8\SDK\v2.0\Bin
   gacutil.exe /i "$(TargetPath)" /f /nologo
   gacutil /l "$(TargetName)" /nologo

Now, everytime you build your project, it'll be installed on GAC.

"break;" out of "if" statement?

break interacts solely with the closest enclosing loop or switch, whether it be a for, while or do .. while type. It is frequently referred to as a goto in disguise, as all loops in C can in fact be transformed into a set of conditional gotos:

for (A; B; C) D;
// translates to
goto test;
loop: D;
iter: C;
test: if (B) goto loop;

while (B) D;          // Simply doesn't have A or C
do { D; } while (B);  // Omits initial goto test
continue;             // goto iter;
break;                // goto end;

The difference is, continue and break interact with virtual labels automatically placed by the compiler. This is similar to what return does as you know it will always jump ahead in the program flow. Switches are slightly more complicated, generating arrays of labels and computed gotos, but the way break works with them is similar.

The programming error the notice refers to is misunderstanding break as interacting with an enclosing block rather than an enclosing loop. Consider:

for (A; B; C) {
   if (E) {
       if (G) break;   // Incorrectly assumed to break if(E), breaks for()

Someone thought, given such a piece of code, that G would cause a jump to I, but it jumps to J. The intended function would use if (!G) H; instead.

Converting a Java Keystore into PEM Format

In case you don't have openssl installed and you are looking for a quick solution, there is software called portcle which is very useful and small to download.

The disadvantage is that there is no command line as far as I know. But from the GUI, it is pretty straight forward to export a PEM private key:

  1. Open you JKS key store
  2. Right click over your private key entry and select export
  3. Select Private Key and certificates and PEM format

    Export PEM private key from JKS with Portcle

.substring error: "is not a function"

document.location is an object, not a string. It returns (by default) the full path, but it actually holds more info than that.

Shortcut for solution: document.location.toString().substring(2,3);

Or use document.location.href or window.location.href

How to implement 2D vector array?

vector<vector> matrix(row, vector(col, 0));

This will initialize a 2D vector of rows=row and columns = col with all initial values as 0. No need to initialize and use resize.

Since the vector is initialized with size, you can use "[]" operator as in array to modify the vector.

matrix[x][y] = 2;

How can one develop iPhone apps in Java?

You can't.

Note however that Monotouch allows you to develop in C# instead of Objective-C.

How to replace a character by a newline in Vim

In the syntax s/foo/bar, \r and \n have different meanings, depending on context.


For foo:

\r == "carriage return" (CR / ^M)
\n == matches "line feed" (LF) on Linux/Mac, and CRLF on Windows

For bar:

\r == produces LF on Linux/Mac, CRLF on Windows
\n == "null byte" (NUL / ^@)

When editing files in linux (i.e. on a webserver) that were initially created in a windows environment and uploaded (i.e. FTP/SFTP) - all the ^M's you see in vim, are the CR's which linux does not translate as it uses only LF's to depict a line break.

Longer (with ASCII numbers):

NUL == 0x00 == 0 == Ctrl + @ == ^@ shown in vim
LF == 0x0A == 10 == Ctrl + J
CR == 0x0D == 13 == Ctrl + M == ^M shown in vim

Here is a list of the ASCII control characters. Insert them in Vim via Ctrl + V,Ctrl + ---key---.

In Bash or the other Unix/Linux shells, just type Ctrl + ---key---.

Try Ctrl + M in Bash. It's the same as hitting Enter, as the shell realizes what is meant, even though Linux systems use line feeds for line delimiting.

To insert literal's in bash, prepending them with Ctrl + V will also work.

Try in Bash:

echo ^[[33;1mcolored.^[[0mnot colored.

This uses ANSI escape sequences. Insert the two ^['s via Ctrl + V, Esc.

You might also try Ctrl + V,Ctrl + M, Enter, which will give you this:

bash: $'\r': command not found

Remember the \r from above? :>

This ASCII control characters list is different from a complete ASCII symbol table, in that the control characters, which are inserted into a console/pseudoterminal/Vim via the Ctrl key (haha), can be found there.

Whereas in C and most other languages, you usually use the octal codes to represent these 'characters'.

If you really want to know where all this comes from: The TTY demystified. This is the best link you will come across about this topic, but beware: There be dragons.


Usually foo = \n, and bar = \r.

How do I find an element that contains specific text in Selenium WebDriver (Python)?

Simply use This:

driver.find_elements_by_xpath('//*[text() = "My Button"]')

isolating a sub-string in a string before a symbol in SQL Server 2008

DECLARE @dd VARCHAR(200) = 'Net Operating Loss - 2007';

SELECT SUBSTRING(@dd, 1, CHARINDEX('-', @dd) -1) F1,
       SUBSTRING(@dd, CHARINDEX('-', @dd) +1, LEN(@dd)) F2

jQuery function after .append

I have another variant which may be useful for someone:

$('<img src="">').load(function() {

How to hide console window in python?

Simply save it with a .pyw extension. This will prevent the console window from opening.

On Windows systems, there is no notion of an “executable mode”. The Python installer automatically associates .py files with python.exe so that a double-click on a Python file will run it as a script. The extension can also be .pyw, in that case, the console window that normally appears is suppressed.

Explanation at the bottom of section 2.2.2

Can I remove the URL from my print css, so the web address doesn't print?

In Firefox, (view page source :: tag HTML).

In your code, replace <html> with <html moznomarginboxes mozdisallowselectionprint>.

In others browsers, I don't know, but you can view

how to align text vertically center in android

Your TextView Attributes need to be something like,

<TextView ... 
        android:gravity="center_vertical|right" ../>

Now, Description why these need to be done,


Makes your TextView to match_parent or fill_parent if You don't want to be it like, match_parent you have to give some specified values to layout_height so it get space for vertical center gravity. android:layout_width="match_parent" necessary because it align your TextView in Right side so you can recognize respect to Parent Layout of TextView.

Now, its about android:gravity which makes the content of Your TextView alignment. android:layout_gravity makes alignment of TextView respected to its Parent Layout.


As below comment says use fill_parent instead of match_parent. (Problem in some device.)

LINQ: Distinct values

In addition to Jon Skeet's answer, you can also use the group by expressions to get the unique groups along w/ a count for each groups iterations:

var query = from e in doc.Elements("whatever")
            group e by new { id = e.Key, val = e.Value } into g
            select new { id =, val = g.Key.val, count = g.Count() };

WebSockets vs. Server-Sent events/EventSource

According to

You can use a client-only polyfill to extend support of SSE to many other browsers. This is less likely with WebSockets. Some EventSource polyfills:

If you need to support all the browsers, consider using a library like web-socket-js, SignalR or which support multiple transports such as WebSockets, SSE, Forever Frame and AJAX long polling. These often require modifications to the server side as well.

Learn more about SSE from:

Learn more about WebSockets from:

Other differences:

  • WebSockets supports arbitrary binary data, SSE only uses UTF-8

How to update UI from another thread running in another class

You're right that you should use the Dispatcher to update controls on the UI thread, and also right that long-running processes should not run on the UI thread. Even if you run the long-running process asynchronously on the UI thread, it can still cause performance issues.

It should be noted that Dispatcher.CurrentDispatcher will return the dispatcher for the current thread, not necessarily the UI thread. I think you can use Application.Current.Dispatcher to get a reference to the UI thread's dispatcher if that's available to you, but if not you'll have to pass the UI dispatcher in to your background thread.

Typically I use the Task Parallel Library for threading operations instead of a BackgroundWorker. I just find it easier to use.

For example,

Task.Factory.StartNew(() => 


void RunLongProcess(SomeViewModel someDataObject)
    for (int i = 0; i <= 1000; i++)

        // Update every 10 executions
        if (i % 10 == 0)
            // Send message to UI thread
                (Action)(() => someDataObject.ProgressValue = (i / 1000)));

How to validate GUID is a GUID

When I'm just testing a string to see if it is a GUID, I don't really want to create a Guid object that I don't need. So...

public static class GuidEx
    public static bool IsGuid(string value)
        Guid x;
        return Guid.TryParse(value, out x);

And here's how you use it:

string testMe = "not a guid";
if (GuidEx.IsGuid(testMe))

Read and write a text file in typescript

import { readFileSync } from 'fs';

const file = readFileSync('./filename.txt', 'utf-8');

This worked for me. You may need to wrap the second command in any function or you may need to declare inside a class without keyword const.

Spring @Autowired and @Qualifier

The @Qualifier annotation is used to resolve the autowiring conflict, when there are multiple beans of same type.

The @Qualifier annotation can be used on any class annotated with @Component or on methods annotated with @Bean. This annotation can also be applied on constructor arguments or method parameters.


public interface Vehicle {
     public void start();
     public void stop();

There are two beans, Car and Bike implements Vehicle interface

public class Car implements Vehicle {

     public void start() {
           System.out.println("Car started");

     public void stop() {
           System.out.println("Car stopped");

public class Bike implements Vehicle {

     public void start() {
          System.out.println("Bike started");

     public void stop() {
          System.out.println("Bike stopped");

Injecting Bike bean in VehicleService using @Autowired with @Qualifier annotation. If you didn't use @Qualifier, it will throw NoUniqueBeanDefinitionException.

public class VehicleService {

    private Vehicle vehicle;

    public void service() {

Reference:- @Qualifier annotation example

Understanding the map function

Python3 - map(func, iterable)

One thing that wasn't mentioned completely (although @BlooB kinda mentioned it) is that map returns a map object NOT a list. This is a big difference when it comes to time performance on initialization and iteration. Consider these two tests.

import time
def test1(iterable):
    a = time.clock()
    map(str, iterable)
    a = time.clock() - a

    b = time.clock()
    [ str(x) for x in iterable ]
    b = time.clock() - b


def test2(iterable):
    a = time.clock()
    [ x for x in map(str, iterable)]
    a = time.clock() - a

    b = time.clock()
    [ str(x) for x in iterable ]
    b = time.clock() - b


test1(range(2000000))  # Prints ~1.7e-5s   ~8s
test2(range(2000000))  # Prints ~9s        ~8s

As you can see initializing the map function takes almost no time at all. However iterating through the map object takes longer than simply iterating through the iterable. This means that the function passed to map() is not applied to each element until the element is reached in the iteration. If you want a list use list comprehension. If you plan to iterate through in a for loop and will break at some point, then use map.

Python import csv to list

A simple loop would suffice:

lines = []
with open('test.txt', 'r') as f:
    for line in f.readlines():
        l,name = line.strip().split(',')

print lines

$on and $broadcast in angular

//Your broadcast in service

(function () { 
    angular.module('appModule').factory('AppService', function ($rootScope, $timeout) {

    function refreshData() {  
        $timeout(function() {         
        }, 0, true);      

    return {           
        RefreshData: refreshData
}); }());

//Controller Implementation
 (function () {
    angular.module('appModule').controller('AppController', function ($rootScope, $scope, $timeout, AppService) {            

       //Removes Listeners before adding them 
       //This line will solve the problem for multiple broadcast call                             
       $scope.$$listeners['refreshData'] = [];

       $scope.$on('refreshData', function() {                                                    

       $scope.onSaveDataComplete = function() { 
    }); }());

Best way to deploy Visual Studio application that can run without installing

First you need to publish the file by:

  1. BUILD -> PUBLISH or by right clicking project on Solution Explorer -> properties -> publish or select project in Solution Explorer and press Alt + Enter NOTE: if you are using Visual Studio 2013 then in properties you have to go to BUILD and then you have to disable define DEBUG constant and define TRACE constant and you are ready to go. Representation

  2. Save your file to a particular folder. Find the produced files (the EXE file and the .config, .manifest, and .application files, along with any DLL files, etc.) - they are all in the same folder and typically in the bin\Debug folder below the project file (.csproj). In Visual Studio they are in the Application Files folder and inside that you just need the .exe and dll files. (You have to delete ClickOnce and other files and then make this folder a zip file and distribute it.)

NOTE: The ClickOnce application does install the project to system, but it has one advantage. You DO NOT require administrative privileges here to run (if your application follows the normal guidelines for which folders to use for application data, etc.).

How to add property to a class dynamically?

Only way to dynamically attach a property is to create a new class and its instance with your new property.

class Holder: p = property(lambda x: vs[i], self.fn_readonly)
setattr(self, k, Holder().p)

"Thinking in AngularJS" if I have a jQuery background?

AngularJS vs. jQuery

AngularJS and jQuery adopt very different ideologies. If you're coming from jQuery you may find some of the differences surprising. Angular may make you angry.

This is normal, you should push through. Angular is worth it.

The big difference (TLDR)

jQuery gives you a toolkit for selecting arbitrary bits of the DOM and making ad-hoc changes to them. You can do pretty much anything you like piece by piece.

AngularJS instead gives you a compiler.

What this means is that AngularJS reads your entire DOM from top to bottom and treats it as code, literally as instructions to the compiler. As it traverses the DOM, It looks for specific directives (compiler directives) that tell the AngularJS compiler how to behave and what to do. Directives are little objects full of JavaScript which can match against attributes, tags, classes or even comments.

When the Angular compiler determines that a piece of the DOM matches a particular directive, it calls the directive function, passing it the DOM element, any attributes, the current $scope (which is a local variable store), and some other useful bits. These attributes may contain expressions which can be interpreted by the Directive, and which tell it how to render, and when it should redraw itself.

Directives can then in turn pull in additional Angular components such as controllers, services, etc. What comes out the bottom of the compiler is a fully formed web application, wired up and ready to go.

This means that Angular is Template Driven. Your template drives the JavaScript, not the other way around. This is a radical reversal of roles, and the complete opposite of the unobtrusive JavaScript we have been writing for the last 10 years or so. This can take some getting used to.

If this sounds like it might be over-prescriptive and limiting, nothing could be farther from the truth. Because AngularJS treats your HTML as code, you get HTML level granularity in your web application. Everything is possible, and most things are surprisingly easy once you make a few conceptual leaps.

Let's get down to the nitty gritty.

First up, Angular doesn't replace jQuery

Angular and jQuery do different things. AngularJS gives you a set of tools to produce web applications. jQuery mainly gives you tools for modifying the DOM. If jQuery is present on your page, AngularJS will use it automatically. If it isn't, AngularJS ships with jQuery Lite, which is a cut down, but still perfectly usable version of jQuery.

Misko likes jQuery and doesn't object to you using it. However you will find as you advance that you can get a pretty much all of your work done using a combination of scope, templates and directives, and you should prefer this workflow where possible because your code will be more discrete, more configurable, and more Angular.

If you do use jQuery, you shouldn't be sprinkling it all over the place. The correct place for DOM manipulation in AngularJS is in a directive. More on these later.

Unobtrusive JavaScript with Selectors vs. Declarative Templates

jQuery is typically applied unobtrusively. Your JavaScript code is linked in the header (or the footer), and this is the only place it is mentioned. We use selectors to pick out bits of the page and write plugins to modify those parts.

The JavaScript is in control. The HTML has a completely independent existence. Your HTML remains semantic even without JavaScript. Onclick attributes are very bad practice.

One of the first things your will notice about AngularJS is that custom attributes are everywhere. Your HTML will be littered with ng attributes, which are essentially onClick attributes on steroids. These are directives (compiler directives), and are one of the main ways in which the template is hooked to the model.

When you first see this you might be tempted to write AngularJS off as old school intrusive JavaScript (like I did at first). In fact, AngularJS does not play by those rules. In AngularJS, your HTML5 is a template. It is compiled by AngularJS to produce your web page.

This is the first big difference. To jQuery, your web page is a DOM to be manipulated. To AngularJS, your HTML is code to be compiled. AngularJS reads in your whole web page and literally compiles it into a new web page using its built in compiler.

Your template should be declarative; its meaning should be clear simply by reading it. We use custom attributes with meaningful names. We make up new HTML elements, again with meaningful names. A designer with minimal HTML knowledge and no coding skill can read your AngularJS template and understand what it is doing. He or she can make modifications. This is the Angular way.

The template is in the driving seat.

One of the first questions I asked myself when starting AngularJS and running through the tutorials is "Where is my code?". I've written no JavaScript, and yet I have all this behaviour. The answer is obvious. Because AngularJS compiles the DOM, AngularJS is treating your HTML as code. For many simple cases it's often sufficient to just write a template and let AngularJS compile it into an application for you.

Your template drives your application. It's treated as a DSL. You write AngularJS components, and AngularJS will take care of pulling them in and making them available at the right time based on the structure of your template. This is very different to a standard MVC pattern, where the template is just for output.

It's more similar to XSLT than Ruby on Rails for example.

This is a radical inversion of control that takes some getting used to.

Stop trying to drive your application from your JavaScript. Let the template drive the application, and let AngularJS take care of wiring the components together. This also is the Angular way.

Semantic HTML vs. Semantic Models

With jQuery your HTML page should contain semantic meaningful content. If the JavaScript is turned off (by a user or search engine) your content remains accessible.

Because AngularJS treats your HTML page as a template. The template is not supposed to be semantic as your content is typically stored in your model which ultimately comes from your API. AngularJS compiles your DOM with the model to produce a semantic web page.

Your HTML source is no longer semantic, instead, your API and compiled DOM are semantic.

In AngularJS, meaning lives in the model, the HTML is just a template, for display only.

At this point you likely have all sorts of questions concerning SEO and accessibility, and rightly so. There are open issues here. Most screen readers will now parse JavaScript. Search engines can also index AJAXed content. Nevertheless, you will want to make sure you are using pushstate URLs and you have a decent sitemap. See here for a discussion of the issue:

Separation of concerns (SOC) vs. MVC

Separation of concerns (SOC) is a pattern that grew up over many years of web development for a variety of reasons including SEO, accessibility and browser incompatibility. It looks like this:

  1. HTML - Semantic meaning. The HTML should stand alone.
  2. CSS - Styling, without the CSS the page is still readable.
  3. JavaScript - Behaviour, without the script the content remains.

Again, AngularJS does not play by their rules. In a stroke, AngularJS does away with a decade of received wisdom and instead implements an MVC pattern in which the template is no longer semantic, not even a little bit.

It looks like this:

  1. Model - your models contains your semantic data. Models are usually JSON objects. Models exist as attributes of an object called $scope. You can also store handy utility functions on $scope which your templates can then access.
  2. View - Your views are written in HTML. The view is usually not semantic because your data lives in the model.
  3. Controller - Your controller is a JavaScript function which hooks the view to the model. Its function is to initialise $scope. Depending on your application, you may or may not need to create a controller. You can have many controllers on a page.

MVC and SOC are not on opposite ends of the same scale, they are on completely different axes. SOC makes no sense in an AngularJS context. You have to forget it and move on.

If, like me, you lived through the browser wars, you might find this idea quite offensive. Get over it, it'll be worth it, I promise.

Plugins vs. Directives

Plugins extend jQuery. AngularJS Directives extend the capabilities of your browser.

In jQuery we define plugins by adding functions to the jQuery.prototype. We then hook these into the DOM by selecting elements and calling the plugin on the result. The idea is to extend the capabilities of jQuery.

For example, if you want a carousel on your page, you might define an unordered list of figures, perhaps wrapped in a nav element. You might then write some jQuery to select the list on the page and restyle it as a gallery with timeouts to do the sliding animation.

In AngularJS, we define directives. A directive is a function which returns a JSON object. This object tells AngularJS what DOM elements to look for, and what changes to make to them. Directives are hooked in to the template using either attributes or elements, which you invent. The idea is to extend the capabilities of HTML with new attributes and elements.

The AngularJS way is to extend the capabilities of native looking HTML. You should write HTML that looks like HTML, extended with custom attributes and elements.

If you want a carousel, just use a <carousel /> element, then define a directive to pull in a template, and make that sucker work.

Lots of small directives vs. big plugins with configuration switches

The tendency with jQuery is to write great big plugins like lightbox which we then configure by passing in numerous values and options.

This is a mistake in AngularJS.

Take the example of a dropdown. When writing a dropdown plugin you might be tempted to code in click handlers, perhaps a function to add in a chevron which is either up or down, perhaps change the class of the unfolded element, show hide the menu, all helpful stuff.

Until you want to make a small change.

Say you have a menu that you want to unfold on hover. Well now we have a problem. Our plugin has wired in our click handler for us, we're going to need to add a configuration option to make it behave differently in this specific case.

In AngularJS we write smaller directives. Our dropdown directive would be ridiculously small. It might maintain the folded state, and provide methods to fold(), unfold() or toggle(). These methods would simply update $ which is a boolean holding the state.

Now in our template we can wire this up:

<a ng-click="toggle()">Menu</a>
<ul ng-show="menu.visible">

Need to update on mouseover?

<a ng-mouseenter="unfold()" ng-mouseleave="fold()">Menu</a>
<ul ng-show="menu.visible">

The template drives the application so we get HTML level granularity. If we want to make case by case exceptions, the template makes this easy.

Closure vs. $scope

JQuery plugins are created in a closure. Privacy is maintained within that closure. It's up to you to maintain your scope chain within that closure. You only really have access to the set of DOM nodes passed in to the plugin by jQuery, plus any local variables defined in the closure and any globals you have defined. This means that plugins are quite self contained. This is a good thing, but can get restrictive when creating a whole application. Trying to pass data between sections of a dynamic page becomes a chore.

AngularJS has $scope objects. These are special objects created and maintained by AngularJS in which you store your model. Certain directives will spawn a new $scope, which by default inherits from its wrapping $scope using JavaScript prototypical inheritance. The $scope object is accessible in the controller and the view.

This is the clever part. Because the structure of $scope inheritance roughly follows the structure of the DOM, elements have access to their own scope, and any containing scopes seamlessly, all the way up to the global $scope (which is not the same as the global scope).

This makes it much easier to pass data around, and to store data at an appropriate level. If a dropdown is unfolded, only the dropdown $scope needs to know about it. If the user updates their preferences, you might want to update the global $scope, and any nested scopes listening to the user preferences would automatically be alerted.

This might sound complicated, in fact, once you relax into it, it's like flying. You don't need to create the $scope object, AngularJS instantiates and configures it for you, correctly and appropriately based on your template hierarchy. AngularJS then makes it available to your component using the magic of dependency injection (more on this later).

Manual DOM changes vs. Data Binding

In jQuery you make all your DOM changes by hand. You construct new DOM elements programatically. If you have a JSON array and you want to put it to the DOM, you must write a function to generate the HTML and insert it.

In AngularJS you can do this too, but you are encouraged to make use of data binding. Change your model, and because the DOM is bound to it via a template your DOM will automatically update, no intervention required.

Because data binding is done from the template, using either an attribute or the curly brace syntax, it's super easy to do. There's little cognitive overhead associated with it so you'll find yourself doing it all the time.

<input ng-model="" />

Binds the input element to $ Updating the input will update the value in your current scope, and vice-versa.



will output the user name in a paragraph. It's a live binding, so if the $ value is updated, the template will update too.

Ajax all of the time

In jQuery making an Ajax call is fairly simple, but it's still something you might think twice about. There's the added complexity to think about, and a fair chunk of script to maintain.

In AngularJS, Ajax is your default go-to solution and it happens all the time, almost without you noticing. You can include templates with ng-include. You can apply a template with the simplest custom directive. You can wrap an Ajax call in a service and create yourself a GitHub service, or a Flickr service, which you can access with astonishing ease.

Service Objects vs Helper Functions

In jQuery, if we want to accomplish a small non-dom related task such as pulling a feed from an API, we might write a little function to do that in our closure. That's a valid solution, but what if we want to access that feed often? What if we want to reuse that code in another application?

AngularJS gives us service objects.

Services are simple objects that contain functions and data. They are always singletons, meaning there can never be more than one of them. Say we want to access the Stack Overflow API, we might write a StackOverflowService which defines methods for doing so.

Let's say we have a shopping cart. We might define a ShoppingCartService which maintains our cart and contains methods for adding and removing items. Because the service is a singleton, and is shared by all other components, any object that needs to can write to the shopping cart and pull data from it. It's always the same cart.

Service objects are self-contained AngularJS components which we can use and reuse as we see fit. They are simple JSON objects containing functions and Data. They are always singletons, so if you store data on a service in one place, you can get that data out somewhere else just by requesting the same service.

Dependency injection (DI) vs. Instatiation - aka de-spaghettification

AngularJS manages your dependencies for you. If you want an object, simply refer to it and AngularJS will get it for you.

Until you start to use this, it's hard to explain just what a massive time boon this is. Nothing like AngularJS DI exists inside jQuery.

DI means that instead of writing your application and wiring it together, you instead define a library of components, each identified by a string.

Say I have a component called 'FlickrService' which defines methods for pulling JSON feeds from Flickr. Now, if I want to write a controller that can access Flickr, I just need to refer to the 'FlickrService' by name when I declare the controller. AngularJS will take care of instantiating the component and making it available to my controller.

For example, here I define a service:

myApp.service('FlickrService', function() {
  return {
    getFeed: function() { // do something here }

Now when I want to use that service I just refer to it by name like this:

myApp.controller('myController', ['FlickrService', function(FlickrService) {

AngularJS will recognise that a FlickrService object is needed to instantiate the controller, and will provide one for us.

This makes wiring things together very easy, and pretty much eliminates any tendency towards spagettification. We have a flat list of components, and AngularJS hands them to us one by one as and when we need them.

Modular service architecture

jQuery says very little about how you should organise your code. AngularJS has opinions.

AngularJS gives you modules into which you can place your code. If you're writing a script that talks to Flickr for example, you might want to create a Flickr module to wrap all your Flickr related functions in. Modules can include other modules (DI). Your main application is usually a module, and this should include all the other modules your application will depend on.

You get simple code reuse, if you want to write another application based on Flickr, you can just include the Flickr module and voila, you have access to all your Flickr related functions in your new application.

Modules contain AngularJS components. When we include a module, all the components in that module become available to us as a simple list identified by their unique strings. We can then inject those components into each other using AngularJS's dependency injection mechanism.

To sum up

AngularJS and jQuery are not enemies. It's possible to use jQuery within AngularJS very nicely. If you're using AngularJS well (templates, data-binding, $scope, directives, etc.) you will find you need a lot less jQuery than you might otherwise require.

The main thing to realise is that your template drives your application. Stop trying to write big plugins that do everything. Instead write little directives that do one thing, then write a simple template to wire them together.

Think less about unobtrusive JavaScript, and instead think in terms of HTML extensions.

My little book

I got so excited about AngularJS, I wrote a short book on it which you're very welcome to read online I hope it's helpful.

Autoreload of modules in IPython

If you add file into the ~/.ipython/profile_default directory with lines like below, then the autoreload functionality will be loaded on IPython startup (tested on 2.0.0):

print "--------->>>>>>>> ENABLE AUTORELOAD <<<<<<<<<------------"

c = get_config()
c.InteractiveShellApp.exec_lines = []
c.InteractiveShellApp.exec_lines.append('%load_ext autoreload')
c.InteractiveShellApp.exec_lines.append('%autoreload 2')

POST data with request module on Node.JS

  1. Install request module, using npm install request

  2. In code:

    var request = require('request');
    var data = '{ "request" : "msg", "data:" {"key1":' + Var1 + ', "key2":' + Var2 + '}}';
    var json_obj = JSON.parse(data);{
        headers: {'content-type': 'application/json'},
        url: 'http://localhost/PhpPage.php',
        form: json_obj
    }, function(error, response, body){

How do I run a bat file in the background from another bat file?

Since START is the only way to execute something in the background from a CMD script, I would recommend you keep using it. Instead of the /B modifier, try /MIN so the newly created window won't bother you. Also, you can set the priority to something lower with /LOW or /BELOWNORMAL, which should improve your system responsiveness.

How is using "<%=request.getContextPath()%>" better than "../"

request.getContextPath()- returns root path of your application, while ../ - returns parent directory of a file.

You use request.getContextPath(), as it will always points to root of your application. If you were to move your jsp file from one directory to another, nothing needs to be changed. Now, consider the second approach. If you were to move your jsp files from one folder to another, you'd have to make changes at every location where you are referring your files.

Also, better approach of using request.getContextPath() will be to set 'request.getContextPath()' in a variable and use that variable for referring your path.

<c:set var="context" value="${pageContext.request.contextPath}" />
<script src="${context}/themes/js/jquery.js"></script>

PS- This is the one reason I can figure out. Don't know if there is any more significance to it.

How do I get the key at a specific index from a Dictionary in Swift?

Here is an example, using Swift 1.2

var person = ["name":"Sean", "gender":"male"]
person.keys.array[1] // "gender", get a dictionary key at specific index 
person.values.array[1] // "male", get a dictionary value at specific index

Update select2 data without rebuilding the control

For Select2 4.X

var instance = $('#select2Container').data('select2');
var searchVal = instance.dropdown.$search.val();
instance.trigger('query', {term:searchVal});

What is the python keyword "with" used for?

Explanation from the Preshing on Programming blog:

It’s handy when you have two related operations which you’d like to execute as a pair, with a block of code in between. The classic example is opening a file, manipulating the file, then closing it:

 with open('output.txt', 'w') as f:
     f.write('Hi there!')

The above with statement will automatically close the file after the nested block of code. (Continue reading to see exactly how the close occurs.) The advantage of using a with statement is that it is guaranteed to close the file no matter how the nested block exits. If an exception occurs before the end of the block, it will close the file before the exception is caught by an outer exception handler. If the nested block were to contain a return statement, or a continue or break statement, the with statement would automatically close the file in those cases, too.

Insert an item into sorted list in Python

Use the insort function of the bisect module:

import bisect 
a = [1, 2, 4, 5] 
bisect.insort(a, 3) 


[1, 2, 3, 4, 5] 

What exactly does big ? notation represent?

Big Theta notation:

Nothing to mess up buddy!!

If we have a positive valued functions f(n) and g(n) takes a positive valued argument n then ?(g(n)) defined as {f(n):there exist constants c1,c2 and n1 for all n>=n1}

where c1 g(n)<=f(n)<=c2 g(n)

Let's take an example:

let f(n)=


c1=5 and c2=8 and n1=1

Among all the notations ,? notation gives the best intuition about the rate of growth of function because it gives us a tight bound unlike big-oh and big -omega which gives the upper and lower bounds respectively.

? tells us that g(n) is as close as f(n),rate of growth of g(n) is as close to the rate of growth of f(n) as possible.

see the image to get a better intuition

Remove shadow below actionbar

You must set app:elevation="0dp" in the and then it works.

    app:elevation="0dp"... >

        app:popupTheme="@style/AppTheme.PopupOverlay" >



Eclipse: Enable autocomplete / content assist

If you are only unfamiliar with the auto-complete while typing syntax or inbuilt methods in the eclipse you can simply type the desired syntax or method name and press Ctrl+Space that will display the list of desired options and you can select one of them.

If the auto-complete option is not enabled then you have to check your settings from Windows menu -> Preferences -> Java -> Editor -> Content assist

How to increment an iterator by 2?

If you don't know wether you have enough next elements in your container or not, you need to check against the end of your container between each increment. Neither ++ nor std::advance will do it for you.

if( ++iter == collection.end())
  ... // stop

if( ++iter == collection.end())
  ... // stop

You may even roll your own bound-secure advance function.

If you are sure that you will not go past the end, then std::advance( iter, 2 ) is the best solution.

Where does forever store console.log output?

Forever takes command line options for output:

-l  LOGFILE      Logs the forever output to LOGFILE
-o  OUTFILE      Logs stdout from child script to OUTFILE
-e  ERRFILE      Logs stderr from child script to ERRFILE

For example:

forever start -o out.log -e err.log my-script.js

See here for more info

Failed to load resource: the server responded with a status of 404 (Not Found)

Add this to your Configuration file. Then put all your resources(eg. img,css,js etc) into the src > main > webapp > resources directory.

public class Config extends WebMvcConfigurerAdapter{
   public void addResourceHandlers(ResourceHandlerRegistry registry) {  

After this, you can access your resources like this.

<link href="${pageContext.request.contextPath}/resources/assets/css/demo.css" rel="stylesheet" />

How can I get the day of a specific date with PHP

$date = '2009-10-22';
$sepparator = '-';
$parts = explode($sepparator, $date);
$dayForDate = date("l", mktime(0, 0, 0, $parts[1], $parts[2], $parts[0]));

Error C1083: Cannot open include file: 'stdafx.h'

Just running through a Visual Studio Code tutorial and came across a similiar issue.

Replace #include "stdafx.h" with #include "pch.h" which is the updated name for the precompiled headers.

What is a correct MIME type for .docx, .pptx, etc.?

Here is the (almost) complete file extensions's MIME in a JSON format. Just do example: MIME["ppt"], MIME["docx"], etc

{"x3d": "application/vnd.hzn-3d-crossword", "3gp": "video/3gpp", "3g2": "video/3gpp2", "mseq": "application/vnd.mseq", "pwn": "application/", "plb": "application/vnd.3gpp.pic-bw-large", "psb": "application/vnd.3gpp.pic-bw-small", "pvb": "application/vnd.3gpp.pic-bw-var", "tcap": "application/vnd.3gpp2.tcap", "7z": "application/x-7z-compressed", "abw": "application/x-abiword", "ace": "application/x-ace-compressed", "acc": "application/vnd.americandynamics.acc", "acu": "application/vnd.acucobol", "atc": "application/vnd.acucorp", "adp": "audio/adpcm", "aab": "application/x-authorware-bin", "aam": "application/x-authorware-map", "aas": "application/x-authorware-seg", "air": "application/vnd.adobe.air-application-installer-package+zip", "swf": "application/x-shockwave-flash", "fxp": "application/vnd.adobe.fxp", "pdf": "application/pdf", "ppd": "application/vnd.cups-ppd", "dir": "application/x-director", "xdp": "application/vnd.adobe.xdp+xml", "xfdf": "application/vnd.adobe.xfdf", "aac": "audio/x-aac", "ahead": "application/", "azf": "application/vnd.airzip.filesecure.azf", "azs": "application/vnd.airzip.filesecure.azs", "azw": "application/", "ami": "application/vnd.amiga.ami", "N/A": "application/andrew-inset", "apk": "application/", "cii": "application/vnd.anser-web-certificate-issue-initiation", "fti": "application/vnd.anser-web-funds-transfer-initiation", "atx": "application/", "dmg": "application/x-apple-diskimage", "mpkg": "application/", "aw": "application/applixware", "mp3": "audio/mpeg", "les": "application/vnd.hhe.lesson-player", "swi": "application/vnd.aristanetworks.swi", "s": "text/x-asm", "atomcat": "application/atomcat+xml", "atomsvc": "application/atomsvc+xml", "atom, .xml": "application/atom+xml", "ac": "application/pkix-attr-cert", "aif": "audio/x-aiff", "avi": "video/x-msvideo", "aep": "application/vnd.audiograph", "dxf": "image/vnd.dxf", "dwf": "model/vnd.dwf", "par": "text/plain-bas", "bcpio": "application/x-bcpio", "bin": "application/octet-stream", "bmp": "image/bmp", "torrent": "application/x-bittorrent", "cod": "application/vnd.rim.cod", "mpm": "application/vnd.blueice.multipass", "bmi": "application/vnd.bmi", "sh": "application/x-sh", "btif": "image/prs.btif", "rep": "application/vnd.businessobjects", "bz": "application/x-bzip", "bz2": "application/x-bzip2", "csh": "application/x-csh", "c": "text/x-c", "cdxml": "application/vnd.chemdraw+xml", "css": "text/css", "cdx": "chemical/x-cdx", "cml": "chemical/x-cml", "csml": "chemical/x-csml", "cdbcmsg": "application/", "cla": "application/vnd.claymore", "c4g": "application/vnd.clonk.c4group", "sub": "image/vnd.dvb.subtitle", "cdmia": "application/cdmi-capability", "cdmic": "application/cdmi-container", "cdmid": "application/cdmi-domain", "cdmio": "application/cdmi-object", "cdmiq": "application/cdmi-queue", "c11amc": "application/vnd.cluetrust.cartomobile-config", "c11amz": "application/vnd.cluetrust.cartomobile-config-pkg", "ras": "image/x-cmu-raster", "dae": "model/vnd.collada+xml", "csv": "text/csv", "cpt": "application/mac-compactpro", "wmlc": "application/vnd.wap.wmlc", "cgm": "image/cgm", "ice": "x-conference/x-cooltalk", "cmx": "image/x-cmx", "xar": "application/vnd.xara", "cmc": "application/vnd.cosmocaller", "cpio": "application/x-cpio", "clkx": "application/vnd.crick.clicker", "clkk": "application/vnd.crick.clicker.keyboard", "clkp": "application/vnd.crick.clicker.palette", "clkt": "application/vnd.crick.clicker.template", "clkw": "application/vnd.crick.clicker.wordbank", "wbs": "application/vnd.criticaltools.wbs+xml", "cryptonote": "application/vnd.rig.cryptonote", "cif": "chemical/x-cif", "cmdf": "chemical/x-cmdf", "cu": "application/cu-seeme", "cww": "application/prs.cww", "curl": "text/vnd.curl", "dcurl": "text/vnd.curl.dcurl", "mcurl": "text/vnd.curl.mcurl", "scurl": "text/vnd.curl.scurl", "car": "application/", "pcurl": "application/vnd.curl.pcurl", "cmp": "application/vnd.yellowriver-custom-menu", "dssc": "application/dssc+der", "xdssc": "application/dssc+xml", "deb": "application/x-debian-package", "uva": "audio/", "uvi": "image/vnd.dece.graphic", "uvh": "video/vnd.dece.hd", "uvm": "video/", "uvu": "video/vnd.uvvu.mp4", "uvp": "video/vnd.dece.pd", "uvs": "video/", "uvv": "video/", "dvi": "application/x-dvi", "seed": "application/vnd.fdsn.seed", "dtb": "application/x-dtbook+xml", "res": "application/x-dtbresource+xml", "ait": "application/vnd.dvb.ait", "svc": "application/vnd.dvb.service", "eol": "audio/", "djvu": "image/vnd.djvu", "dtd": "application/xml-dtd", "mlp": "application/vnd.dolby.mlp", "wad": "application/x-doom", "dpg": "application/vnd.dpgraph", "dra": "audio/vnd.dra", "dfac": "application/vnd.dreamfactory", "dts": "audio/vnd.dts", "dtshd": "audio/vnd.dts.hd", "dwg": "image/vnd.dwg", "geo": "application/vnd.dynageo", "es": "application/ecmascript", "mag": "application/vnd.ecowin.chart", "mmr": "image/", "rlc": "image/", "exi": "application/exi", "mgz": "application/vnd.proteus.magazine", "epub": "application/epub+zip", "eml": "message/rfc822", "nml": "application/vnd.enliven", "xpr": "application/", "xif": "image/vnd.xiff", "xfdl": "application/vnd.xfdl", "emma": "application/emma+xml", "ez2": "application/vnd.ezpix-album", "ez3": "application/vnd.ezpix-package", "fst": "image/vnd.fst", "fvt": "video/vnd.fvt", "fbs": "image/vnd.fastbidsheet", "fe_launch": "application/vnd.denovo.fcselayout-link", "f4v": "video/x-f4v", "flv": "video/x-flv", "fpx": "image/vnd.fpx", "npx": "image/", "flx": "text/vnd.fmi.flexstor", "fli": "video/x-fli", "ftc": "application/vnd.fluxtime.clip", "fdf": "application/vnd.fdf", "f": "text/x-fortran", "mif": "application/vnd.mif", "fm": "application/vnd.framemaker", "fh": "image/x-freehand", "fsc": "application/vnd.fsc.weblaunch", "fnc": "application/", "ltf": "application/", "ddd": "application/", "xdw": "application/", "xbd": "application/", "oas": "application/", "oa2": "application/", "oa3": "application/", "fg5": "application/", "bh2": "application/", "spl": "application/x-futuresplash", "fzs": "application/vnd.fuzzysheet", "g3": "image/g3fax", "gmx": "application/", "gtw": "model/vnd.gtw", "txd": "application/vnd.genomatix.tuxedo", "ggb": "application/vnd.geogebra.file", "ggt": "application/vnd.geogebra.tool", "gdl": "model/vnd.gdl", "gex": "application/vnd.geometry-explorer", "gxt": "application/vnd.geonext", "g2w": "application/vnd.geoplan", "g3w": "application/vnd.geospace", "gsf": "application/x-font-ghostscript", "bdf": "application/x-font-bdf", "gtar": "application/x-gtar", "texinfo": "application/x-texinfo", "gnumeric": "application/x-gnumeric", "kml": "application/", "kmz": "application/", "gqf": "application/vnd.grafeq", "gif": "image/gif", "gv": "text/vnd.graphviz", "gac": "application/vnd.groove-account", "ghf": "application/vnd.groove-help", "gim": "application/vnd.groove-identity-message", "grv": "application/vnd.groove-injector", "gtm": "application/vnd.groove-tool-message", "tpl": "application/vnd.groove-tool-template", "vcg": "application/vnd.groove-vcard", "h261": "video/h261", "h263": "video/h263", "h264": "video/h264", "hpid": "application/vnd.hp-hpid", "hps": "application/vnd.hp-hps", "hdf": "application/x-hdf", "rip": "audio/", "hbci": "application/vnd.hbci", "jlt": "application/vnd.hp-jlyt", "pcl": "application/vnd.hp-pcl", "hpgl": "application/vnd.hp-hpgl", "hvs": "application/vnd.yamaha.hv-script", "hvd": "application/vnd.yamaha.hv-dic", "hvp": "application/vnd.yamaha.hv-voice", "sfd-hdstx": "application/vnd.hydrostatix.sof-data", "stk": "application/hyperstudio", "hal": "application/vnd.hal+xml", "html": "text/html", "irm": "application/", "sc": "application/", "ics": "text/calendar", "icc": "application/vnd.iccprofile", "ico": "image/x-icon", "igl": "application/vnd.igloader", "ief": "image/ief", "ivp": "application/vnd.immervision-ivp", "ivu": "application/vnd.immervision-ivu", "rif": "application/reginfo+xml", "3dml": "text/vnd.in3d.3dml", "spot": "text/", "igs": "model/iges", "i2g": "application/vnd.intergeo", "cdy": "application/vnd.cinderella", "xpw": "application/vnd.intercon.formnet", "fcs": "application/vnd.isac.fcs", "ipfix": "application/ipfix", "cer": "application/pkix-cert", "pki": "application/pkixcmp", "crl": "application/pkix-crl", "pkipath": "application/pkix-pkipath", "igm": "application/vnd.insors.igm", "rcprofile": "application/vnd.ipunplugged.rcprofile", "irp": "application/vnd.irepository.package+xml", "jad": "text/", "jar": "application/java-archive", "class": "application/java-vm", "jnlp": "application/x-java-jnlp-file", "ser": "application/java-serialized-object", "java": "text/x-java-source,java", "js": "application/javascript", "json": "application/json", "joda": "application/vnd.joost.joda-archive", "jpm": "video/jpm", "jpeg, .jpg": "image/x-citrix-jpeg", "pjpeg": "image/pjpeg", "jpgv": "video/jpeg", "ktz": "application/vnd.kahootz", "mmd": "application/vnd.chipnuts.karaoke-mmd", "karbon": "application/vnd.kde.karbon", "chrt": "application/vnd.kde.kchart", "kfo": "application/vnd.kde.kformula", "flw": "application/vnd.kde.kivio", "kon": "application/vnd.kde.kontour", "kpr": "application/vnd.kde.kpresenter", "ksp": "application/vnd.kde.kspread", "kwd": "application/vnd.kde.kword", "htke": "application/vnd.kenameaapp", "kia": "application/vnd.kidspiration", "kne": "application/vnd.kinar", "sse": "application/vnd.kodak-descriptor", "lasxml": "application/vnd.las.las+xml", "latex": "application/x-latex", "lbd": "application/", "lbe": "application/", "jam": "application/vnd.jam", "123": "application/vnd.lotus-1-2-3", "apr": "application/vnd.lotus-approach", "pre": "application/vnd.lotus-freelance", "nsf": "application/vnd.lotus-notes", "org": "application/vnd.lotus-organizer", "scm": "application/vnd.lotus-screencam", "lwp": "application/vnd.lotus-wordpro", "lvp": "audio/vnd.lucent.voice", "m3u": "audio/x-mpegurl", "m4v": "video/x-m4v", "hqx": "application/mac-binhex40", "portpkg": "application/vnd.macports.portpkg", "mgp": "application/vnd.osgeo.mapguide.package", "mrc": "application/marc", "mrcx": "application/marcxml+xml", "mxf": "application/mxf", "nbp": "application/vnd.wolfram.player", "ma": "application/mathematica", "mathml": "application/mathml+xml", "mbox": "application/mbox", "mc1": "application/vnd.medcalcdata", "mscml": "application/mediaservercontrol+xml", "cdkey": "application/vnd.mediastation.cdkey", "mwf": "application/vnd.mfer", "mfm": "application/vnd.mfmp", "msh": "model/mesh", "mads": "application/mads+xml", "mets": "application/mets+xml", "mods": "application/mods+xml", "meta4": "application/metalink4+xml", "mcd": "application/", "flo": "application/vnd.micrografx.flo", "igx": "application/vnd.micrografx.igx", "es3": "application/vnd.eszigno3+xml", "mdb": "application/x-msaccess", "asf": "video/x-ms-asf", "exe": "application/x-msdownload", "cil": "application/", "cab": "application/", "ims": "application/", "application": "application/x-ms-application", "clp": "application/x-msclip", "mdi": "image/", "eot": "application/", "xls": "application/", "xlam": "application/", "xlsb": "application/", "xltm": "application/", "xlsm": "application/", "chm": "application/", "crd": "application/x-mscardfile", "lrm": "application/", "mvb": "application/x-msmediaview", "mny": "application/x-msmoney", "pptx": "application/vnd.openxmlformats-officedocument.presentationml.presentation", "sldx": "application/vnd.openxmlformats-officedocument.presentationml.slide", "ppsx": "application/vnd.openxmlformats-officedocument.presentationml.slideshow", "potx": "application/vnd.openxmlformats-officedocument.presentationml.template", "xlsx": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "xltx": "application/vnd.openxmlformats-officedocument.spreadsheetml.template", "docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document", "dotx": "application/vnd.openxmlformats-officedocument.wordprocessingml.template", "obd": "application/x-msbinder", "thmx": "application/", "onetoc": "application/onenote", "pya": "audio/", "pyv": "video/", "ppt": "application/", "ppam": "application/", "sldm": "application/", "pptm": "application/", "ppsm": "application/", "potm": "application/", "mpp": "application/", "pub": "application/x-mspublisher", "scd": "application/x-msschedule", "xap": "application/x-silverlight-app", "stl": "application/", "cat": "application/", "vsd": "application/vnd.visio", "vsdx": "application/vnd.visio2013", "wm": "video/x-ms-wm", "wma": "audio/x-ms-wma", "wax": "audio/x-ms-wax", "wmx": "video/x-ms-wmx", "wmd": "application/x-ms-wmd", "wpl": "application/", "wmz": "application/x-ms-wmz", "wmv": "video/x-ms-wmv", "wvx": "video/x-ms-wvx", "wmf": "application/x-msmetafile", "trm": "application/x-msterminal", "doc": "application/msword", "docm": "application/", "dotm": "application/", "wri": "application/x-mswrite", "wps": "application/", "xbap": "application/x-ms-xbap", "xps": "application/", "mid": "audio/midi", "mpy": "application/", "afp": "application/", "rms": "application/", "tmo": "application/vnd.tmobile-livetv", "prc": "application/x-mobipocket-ebook", "mbk": "application/vnd.mobius.mbk", "dis": "application/vnd.mobius.dis", "plc": "application/vnd.mobius.plc", "mqy": "application/vnd.mobius.mqy", "msl": "application/vnd.mobius.msl", "txf": "application/vnd.mobius.txf", "daf": "application/vnd.mobius.daf", "fly": "text/", "mpc": "application/vnd.mophun.certificate", "mpn": "application/vnd.mophun.application", "mj2": "video/mj2", "mpga": "audio/mpeg", "mxu": "video/vnd.mpegurl", "mpeg": "video/mpeg", "m21": "application/mp21", "mp4a": "audio/mp4", "mp4": "application/mp4", "m3u8": "application/", "mus": "application/vnd.musician", "msty": "application/", "mxml": "application/xv+xml", "ngdat": "application/", "n-gage": "application/", "ncx": "application/x-dtbncx+xml", "nc": "application/x-netcdf", "nlu": "application/vnd.neurolanguage.nlu", "dna": "application/vnd.dna", "nnd": "application/vnd.noblenet-directory", "nns": "application/vnd.noblenet-sealer", "nnw": "application/vnd.noblenet-web", "rpst": "application/", "rpss": "application/", "n3": "text/n3", "edm": "application/vnd.novadigm.edm", "edx": "application/vnd.novadigm.edx", "ext": "application/vnd.novadigm.ext", "gph": "application/vnd.flographit", "ecelp4800": "audio/vnd.nuera.ecelp4800", "ecelp7470": "audio/vnd.nuera.ecelp7470", "ecelp9600": "audio/vnd.nuera.ecelp9600", "oda": "application/oda", "ogx": "application/ogg", "oga": "audio/ogg", "ogv": "video/ogg", "dd2": "application/vnd.oma.dd2+xml", "oth": "application/vnd.oasis.opendocument.text-web", "opf": "application/oebps-package+xml", "qbo": "application/vnd.intu.qbo", "oxt": "application/vnd.openofficeorg.extension", "osf": "application/vnd.yamaha.openscoreformat", "weba": "audio/webm", "webm": "video/webm", "odc": "application/vnd.oasis.opendocument.chart", "otc": "application/vnd.oasis.opendocument.chart-template", "odb": "application/vnd.oasis.opendocument.database", "odf": "application/vnd.oasis.opendocument.formula", "odft": "application/vnd.oasis.opendocument.formula-template", "odg": "application/", "otg": "application/", "odi": "application/vnd.oasis.opendocument.image", "oti": "application/vnd.oasis.opendocument.image-template", "odp": "application/vnd.oasis.opendocument.presentation", "otp": "application/vnd.oasis.opendocument.presentation-template", "ods": "application/vnd.oasis.opendocument.spreadsheet", "ots": "application/vnd.oasis.opendocument.spreadsheet-template", "odt": "application/vnd.oasis.opendocument.text", "odm": "application/vnd.oasis.opendocument.text-master", "ott": "application/vnd.oasis.opendocument.text-template", "ktx": "image/ktx", "sxc": "application/vnd.sun.xml.calc", "stc": "application/vnd.sun.xml.calc.template", "sxd": "application/vnd.sun.xml.draw", "std": "application/vnd.sun.xml.draw.template", "sxi": "application/vnd.sun.xml.impress", "sti": "application/vnd.sun.xml.impress.template", "sxm": "application/vnd.sun.xml.math", "sxw": "application/vnd.sun.xml.writer", "sxg": "application/", "stw": "application/vnd.sun.xml.writer.template", "otf": "application/x-font-otf", "osfpvg": "application/vnd.yamaha.openscoreformat.osfpvg+xml", "dp": "application/vnd.osgi.dp", "pdb": "application/vnd.palm", "p": "text/x-pascal", "paw": "application/vnd.pawaafile", "pclxl": "application/vnd.hp-pclxl", "efif": "application/vnd.picsel", "pcx": "image/x-pcx", "psd": "image/vnd.adobe.photoshop", "prf": "application/pics-rules", "pic": "image/x-pict", "chat": "application/x-chat", "p10": "application/pkcs10", "p12": "application/x-pkcs12", "p7m": "application/pkcs7-mime", "p7s": "application/pkcs7-signature", "p7r": "application/x-pkcs7-certreqresp", "p7b": "application/x-pkcs7-certificates", "p8": "application/pkcs8", "plf": "application/vnd.pocketlearn", "pnm": "image/x-portable-anymap", "pbm": "image/x-portable-bitmap", "pcf": "application/x-font-pcf", "pfr": "application/font-tdpfr", "pgn": "application/x-chess-pgn", "pgm": "image/x-portable-graymap", "png": "image/x-png", "ppm": "image/x-portable-pixmap", "pskcxml": "application/pskc+xml", "pml": "application/vnd.ctc-posml", "ai": "application/postscript", "pfa": "application/x-font-type1", "pbd": "application/vnd.powerbuilder6", "pgp": "application/pgp-signature", "box": "application/", "ptid": "application/vnd.pvi.ptid1", "pls": "application/pls+xml", "str": "application/", "ei6": "application/", "dsc": "text/prs.lines.tag", "psf": "application/x-font-linux-psf", "qps": "application/vnd.publishare-delta-tree", "wg": "application/vnd.pmi.widget", "qxd": "application/vnd.quark.quarkxpress", "esf": "application/", "msf": "application/", "ssf": "application/", "qam": "application/", "qfx": "application/vnd.intu.qfx", "qt": "video/quicktime", "rar": "application/x-rar-compressed", "ram": "audio/x-pn-realaudio", "rmp": "audio/x-pn-realaudio-plugin", "rsd": "application/rsd+xml", "rm": "application/vnd.rn-realmedia", "bed": "application/vnd.realvnc.bed", "mxl": "application/vnd.recordare.musicxml", "musicxml": "application/vnd.recordare.musicxml+xml", "rnc": "application/relax-ng-compact-syntax", "rdz": "application/", "rdf": "application/rdf+xml", "rp9": "application/vnd.cloanto.rp9", "jisp": "application/vnd.jisp", "rtf": "application/rtf", "rtx": "text/richtext", "link66": "application/vnd.route66.link66+xml", "rss, .xml": "application/rss+xml", "shf": "application/shf+xml", "st": "application/vnd.sailingtracker.track", "svg": "image/svg+xml", "sus": "application/vnd.sus-calendar", "sru": "application/sru+xml", "setpay": "application/set-payment-initiation", "setreg": "application/set-registration-initiation", "sema": "application/vnd.sema", "semd": "application/vnd.semd", "semf": "application/vnd.semf", "see": "application/vnd.seemail", "snf": "application/x-font-snf", "spq": "application/scvp-vp-request", "spp": "application/scvp-vp-response", "scq": "application/scvp-cv-request", "scs": "application/scvp-cv-response", "sdp": "application/sdp", "etx": "text/x-setext", "movie": "video/x-sgi-movie", "ifm": "application/vnd.shana.informed.formdata", "itp": "application/vnd.shana.informed.formtemplate", "iif": "application/vnd.shana.informed.interchange", "ipk": "application/vnd.shana.informed.package", "tfi": "application/thraud+xml", "shar": "application/x-shar", "rgb": "image/x-rgb", "slt": "application/", "aso": "application/vnd.accpac.simply.aso", "imp": "application/vnd.accpac.simply.imp", "twd": "application/vnd.simtech-mindmapper", "csp": "application/vnd.commonspace", "saf": "application/vnd.yamaha.smaf-audio", "mmf": "application/vnd.smaf", "spf": "application/vnd.yamaha.smaf-phrase", "teacher": "application/", "svd": "application/vnd.svd", "rq": "application/sparql-query", "srx": "application/sparql-results+xml", "gram": "application/srgs", "grxml": "application/srgs+xml", "ssml": "application/ssml+xml", "skp": "application/vnd.koan", "sgml": "text/sgml", "sdc": "application/vnd.stardivision.calc", "sda": "application/vnd.stardivision.draw", "sdd": "application/vnd.stardivision.impress", "smf": "application/vnd.stardivision.math", "sdw": "application/vnd.stardivision.writer", "sgl": "application/vnd.stardivision.writer-global", "sm": "application/vnd.stepmania.stepchart", "sit": "application/x-stuffit", "sitx": "application/x-stuffitx", "sdkm": "application/vnd.solent.sdkm+xml", "xo": "application/vnd.olpc-sugar", "au": "audio/basic", "wqd": "application/vnd.wqd", "sis": "application/vnd.symbian.install", "smi": "application/smil+xml", "xsm": "application/vnd.syncml+xml", "bdm": "application/", "xdm": "application/", "sv4cpio": "application/x-sv4cpio", "sv4crc": "application/x-sv4crc", "sbml": "application/sbml+xml", "tsv": "text/tab-separated-values", "tiff": "image/tiff", "tao": "application/vnd.tao.intent-module-archive", "tar": "application/x-tar", "tcl": "application/x-tcl", "tex": "application/x-tex", "tfm": "application/x-tex-tfm", "tei": "application/tei+xml", "txt": "text/plain", "dxp": "application/vnd.spotfire.dxp", "sfs": "application/vnd.spotfire.sfs", "tsd": "application/timestamped-data", "tpt": "application/vnd.trid.tpt", "mxs": "application/vnd.triscape.mxs", "t": "text/troff", "tra": "application/vnd.trueapp", "ttf": "application/x-font-ttf", "ttl": "text/turtle", "umj": "application/vnd.umajin", "uoml": "application/vnd.uoml+xml", "unityweb": "application/vnd.unity", "ufd": "application/vnd.ufdl", "uri": "text/uri-list", "utz": "application/vnd.uiq.theme", "ustar": "application/x-ustar", "uu": "text/x-uuencode", "vcs": "text/x-vcalendar", "vcf": "text/x-vcard", "vcd": "application/x-cdlink", "vsf": "application/vnd.vsf", "wrl": "model/vrml", "vcx": "application/vnd.vcx", "mts": "model/vnd.mts", "vtu": "model/vnd.vtu", "vis": "application/vnd.visionary", "viv": "video/", "ccxml": "application/ccxml+xml,", "vxml": "application/voicexml+xml", "src": "application/x-wais-source", "wbxml": "application/vnd.wap.wbxml", "wbmp": "image/vnd.wap.wbmp", "wav": "audio/x-wav", "davmount": "application/davmount+xml", "woff": "application/x-font-woff", "wspolicy": "application/wspolicy+xml", "webp": "image/webp", "wtb": "application/vnd.webturbo", "wgt": "application/widget", "hlp": "application/winhlp", "wml": "text/vnd.wap.wml", "wmls": "text/vnd.wap.wmlscript", "wmlsc": "application/vnd.wap.wmlscriptc", "wpd": "application/vnd.wordperfect", "stf": "application/vnd.wt.stf", "wsdl": "application/wsdl+xml", "xbm": "image/x-xbitmap", "xpm": "image/x-xpixmap", "xwd": "image/x-xwindowdump", "der": "application/x-x509-ca-cert", "fig": "application/x-xfig", "xhtml": "application/xhtml+xml", "xml": "application/xml", "xdf": "application/xcap-diff+xml", "xenc": "application/xenc+xml", "xer": "application/patch-ops-error+xml", "rl": "application/resource-lists+xml", "rs": "application/rls-services+xml", "rld": "application/resource-lists-diff+xml", "xslt": "application/xslt+xml", "xop": "application/xop+xml", "xpi": "application/x-xpinstall", "xspf": "application/xspf+xml", "xul": "application/vnd.mozilla.xul+xml", "xyz": "chemical/x-xyz", "yaml": "text/yaml", "yang": "application/yang", "yin": "application/yin+xml", "zir": "application/vnd.zul", "zip": "application/zip", "zmm": "application/vnd.handheld-entertainment+xml", "zaz": "application/vnd.zzazz.deck+xml"}

Check if int is between two numbers

Because that syntax simply isn't defined? Besides, x < y evaluates as a bool, so what does bool < int mean? It isn't really an overhead; besides, you could write a utility method if you really want - isBetween(10,x,20) - I wouldn't myself, but hey...

Find closing HTML tag in Sublime Text

Under the "Goto" menu, Control + M is Jump to Matching Bracket. Works for parentheses as well.

Importing csv file into R - numeric values read as characters

In read.table (and its relatives) it is the na.strings argument which specifies which strings are to be interpreted as missing values NA. The default value is na.strings = "NA"

If missing values in an otherwise numeric variable column are coded as something else than "NA", e.g. "." or "N/A", these rows will be interpreted as character, and then the whole column is converted to character.

Thus, if your missing values are some else than "NA", you need to specify them in na.strings.

What is the difference between a Shared Project and a Class Library in Visual Studio 2015?

Class library is shared compiled code.

Shared project is shared source code.

"Missing return statement" within if / for / while

Any how myMethod() should return a String value .what if your condition is false is myMethod return anything? ans is no so you need to define return null or some string value in false condition

public String myMethod() {
    boolean c=true;
    if (conditions) {
        return "d";
    return null;//or some other string value

JavaScript seconds to time string with format hh:mm:ss

I'm personally prefer the leading unit (days, hours, minutes) without leading zeros. But seconds should always be leaded by minutes (0:13), this presentation is easily considered as 'duration', without further explanation (marking as min, sec(s), etc.), usable in various languages (internationalization).

    // returns  (-)d.h:mm:ss(.f)
    //          (-)h:mm:ss(.f)
    //          (-)m:ss(.f)
    function formatSeconds (value, fracDigits) {
        var isNegative = false;
        if (isNaN(value)) {
            return value;
        } else if (value < 0) {
            isNegative = true;
            value = Math.abs(value);
        var days = Math.floor(value / 86400);
        value %= 86400;
        var hours = Math.floor(value / 3600);
        value %= 3600;
        var minutes = Math.floor(value / 60);
        var seconds = (value % 60).toFixed(fracDigits || 0);
        if (seconds < 10) {
            seconds = '0' + seconds;

        var res = hours ? (hours + ':' + ('0' + minutes).slice(-2) + ':' + seconds) : (minutes + ':' + seconds);
        if (days) {
            res = days + '.' + res;
        return (isNegative ? ('-' + res) : res);

//imitating the server side (.net, C#) duration formatting like:

    public static string Format(this TimeSpan interval)
        string pattern;
        if (interval.Days > 0)          pattern = @"d\.h\:mm\:ss";
        else if (interval.Hours > 0)    pattern = @"h\:mm\:ss";
        else                            pattern = @"m\:ss";
        return string.Format("{0}", interval.ToString(pattern));

How to align the checkbox and label in same line in html?

Just place a div around the input and label...

        <input id="checkid"  type="checkbox" value="test" />
        <label  style="word-wrap:break-word">testdata</label>

How to convert a Binary String to a base 10 integer in Java

If you're worried about performance, Integer.parseInt() and Math.pow() are too expensive. You can use bit manipulation to do the same thing twice as fast (based on my experience):

final int num = 87;
String biStr = Integer.toBinaryString(num);

System.out.println(" Input Number: " + num + " toBinary "+ biStr);
int dec = binaryStringToDecimal(biStr);
System.out.println("Output Number: " + dec + " toBinary "+Integer.toBinaryString(dec));


int binaryStringToDecimal(String biString){
  int n = biString.length();      
  int decimal = 0;
  for (int d = 0; d < n; d++){
    // append a bit=0 (i.e. shift left) 
    decimal = decimal << 1;

    // if biStr[d] is 1, flip last added bit=0 to 1 
    if (biString.charAt(d) == '1'){
      decimal = decimal | 1; // e.g. dec = 110 | (00)1 = 111
  return decimal;


 Input Number: 87 toBinary 1010111
Output Number: 87 toBinary 1010111

PostgreSQL INSERT ON CONFLICT UPDATE (upsert) use all excluded values

Postgres hasn't implemented an equivalent to INSERT OR REPLACE. From the ON CONFLICT docs (emphasis mine):

It can be either DO NOTHING, or a DO UPDATE clause specifying the exact details of the UPDATE action to be performed in case of a conflict.

Though it doesn't give you shorthand for replacement, ON CONFLICT DO UPDATE applies more generally, since it lets you set new values based on preexisting data. For example:

INSERT INTO users (id, level)
VALUES (1, 0)
SET level = users.level + 1;

How can I position my div at the bottom of its container?

Maybe this helps someone: You can always place the div outside the other div and then push it upwards using negative margin:

<div id="container" style="background-color: #ccc; padding-bottom: 30px;">
<div id="copyright" style="margin-top: -20px;">
  Copyright Foo web designs

jQuery - trapping tab select event

From what I can tell, per the documentation here:, it seems as though you're not quite initializing it right. The demos state that you need a main wrapped <div> element, with a <ul> or possibly <ol> element representing the tabs, and then an element for each tab page (presumable a <div> or <p>, possibly a <section> if we're using HTML5). Then you call $().tabs() on the main <div>, not the <ul> element.

After that, you can bind to the tabsselect event no problem. Check out this fiddle for basic, basic example:

What's the best way to override a user agent CSS stylesheet rule that gives unordered-lists a 1em margin?

I don't understand why nobody points to the specific issue and some answers are totally misleading, especially the accepted answer. The issue is that the OP did not pick a rule that could possibly override the margin property that is set by the User Agent (UA) directly on the ul tag. Let's consider all the rules with a margin property used by the OP.

body {


The body element is way up in the DOM and the UA rule matches an element below, so the UA wins. It's the way inheritance works. Inheritance is the means by which, in the absence of any specific declarations from any source applied by the CSS cascade, a property value of an element is obtained from its parent element. Specificity on the parent element is useless, because the UA rule matches directly the element.

    margin:0 auto;

This is a better attempt, a more specific selector #mainNav, which matches the mainNav element lower in the DOM, but the same principle applies, because the ul element is still below this element in the DOM.

#mainNav ul li{

This went too far down in the DOM! Now, the selector matches the li element, which is below the ul element.

So, assuming that the UA rule used the selector ul and not !important, which is most likely the case, the solution would have been a simple ul { margin: 0; }, but it would be safer to make it more specific, say #mainNav ul { margin: 0 }.

jQuery - Disable Form Fields

$('input, select').attr('disabled', 'disabled');

How do I set up NSZombieEnabled in Xcode 4?

In Xcode > 4.3:

You click on the scheme drop down bar -> edit scheme -> arguments tab and then add NSZombieEnabled in the Environment Variables column and YES in the value column.

Good Luck !!!

C# Convert string from UTF-8 to ISO-8859-1 (Latin1) H

Seems bit strange code. To get string from Utf8 byte stream all you need to do is:

string str = Encoding.UTF8.GetString(utf8ByteArray);

If you need to save iso-8859-1 byte stream to somewhere then just use: additional line of code for previous:

byte[] iso88591data = Encoding.GetEncoding("ISO-8859-1").GetBytes(str);

What's the difference between "git reset" and "git checkout"?

In their simplest form, reset resets the index without touching the working tree, while checkout changes the working tree without touching the index.

Resets the index to match HEAD, working tree left alone:

git reset

Conceptually, this checks out the index into the working tree. To get it to actually do anything you would have to use -f to force it to overwrite any local changes. This is a safety feature to make sure that the "no argument" form isn't destructive:

git checkout

Once you start adding parameters it is true that there is some overlap.

checkout is usually used with a branch, tag or commit. In this case it will reset HEAD and the index to the given commit as well as performing the checkout of the index into the working tree.

Also, if you supply --hard to reset you can ask reset to overwrite the working tree as well as resetting the index.

If you current have a branch checked out out there is a crucial different between reset and checkout when you supply an alternative branch or commit. reset will change the current branch to point at the selected commit whereas checkout will leave the current branch alone but will checkout the supplied branch or commit instead.

Other forms of reset and commit involve supplying paths.

If you supply paths to reset you cannot supply --hard and reset will only change the index version of the supplied paths to the version in the supplied commit (or HEAD if you don't specify a commit).

If you supply paths to checkout, like reset it will update the index version of the supplied paths to match the supplied commit (or HEAD) but it will always checkout the index version of the supplied paths into the working tree.

How to submit form on change of dropdown list?

Simple JavaScript will do -

<form action="" method="POST">
    <select name="myselect" id="myselect" onchange="this.form.submit()">
        <option value="1">One</option>
        <option value="2">Two</option>
        <option value="3">Three</option>
        <option value="4">Four</option>

Here is a link for a good javascript tutorial.

Tesseract OCR simple example

Here's a great working example project; Tesseract OCR Sample (Visual Studio) with Leptonica Preprocessing Tesseract OCR Sample (Visual Studio) with Leptonica Preprocessing

Tesseract OCR 3.02.02 API can be confusing, so this guides you through including the Tesseract and Leptonica dll into a Visual Studio C++ Project, and provides a sample file which takes an image path to preprocess and OCR. The preprocessing script in Leptonica converts the input image into black and white book-like text.


To include this in your own projects, you will need to reference the header files and lib and copy the tessdata folders and dlls.

Copy the tesseract-include folder to the root folder of your project. Now Click on your project in Visual Studio Solution Explorer, and go to Project>Properties.

VC++ Directories>Include Directories:

..\tesseract-include\tesseract;..\tesseract-include\leptonica;$(IncludePath) C/C++>Preprocessor>Preprocessor Definitions:

_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions) C/C++>Linker>Input>Additional Dependencies:

..\tesseract-include\libtesseract302.lib;..\tesseract-include\liblept168.lib;%(AdditionalDependencies) Now you can include headers in your project's file:



Now copy the two dll files in tesseract-include and the tessdata folder in Debug to the Output Directory of your project.

When you initialize tesseract, you need to specify the location of the parent folder (!important) of the tessdata folder if it is not already the current directory of your executable file. You can copy my script, which assumes tessdata is installed in the executable's folder.

tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI(); api->Init("D:\tessdataParentFolder\", ... Sample

You can compile the provided sample, which takes one command line argument of the image path to use. The preprocess() function uses Leptonica to create a black and white book-like copy of the image which makes tesseract work with 90% accuracy. The ocr() function shows the functionality of the Tesseract API to return a string output. The toClipboard() can be used to save text to clipboard on Windows. You can copy these into your own projects.

What are good grep tools for Windows?

ack works well on Windows (if you've got Perl). I find it better than grep for many uses.

How to get a unix script to run every 15 seconds?

I would use cron to run a script every minute, and make that script run your script four times with a 15-second sleep between runs.

(That assumes your script is quick to run - you could adjust the sleep times if not.)

That way, you get all the benefits of cron as well as your 15 second run period.

Edit: See also @bmb's comment below.

Removing element from array in component state

As mentioned in a comment to ephrion's answer above, filter() can be slow, especially with large arrays, as it loops to look for an index that appears to have been determined already. This is a clean, but inefficient solution.

As an alternative one can simply 'slice' out the desired element and concatenate the fragments.

var dummyArray = [];    
this.setState({data: dummyArray.concat(, index),})

Hope this helps!

Escape curly brace '{' in String.Format

Use double braces {{ or }} so your code becomes:

sb.AppendLine(String.Format("public {0} {1} {{ get; private set; }}", 
prop.Type, prop.Name));

// For prop.Type of "Foo" and prop.Name of "Bar", the result would be:
// public Foo Bar { get; private set; }

How to Insert BOOL Value to MySQL Database

TRUE and FALSE are keywords, and should not be quoted as strings:


By quoting them as strings, MySQL will then cast them to their integer equivalent (since booleans are really just a one-byte INT in MySQL), which translates into zero for any non-numeric string. Thus, you get 0 for both values in your table.

Non-numeric strings cast to zero:

|                      0 |                       0 |                   12345 |

But the keywords return their corresponding INT representation:

|    1 |     0 |

Note also, that I have replaced your double-quotes with single quotes as are more standard SQL string enclosures. Finally, I have replaced your empty strings for id with NULL. The empty string may issue a warning.

Passing an array to a query using a WHERE clause

Col. Shrapnel's SafeMySQL library for PHP provides type-hinted placeholders in its parametrised queries, and includes a couple of convenient placeholders for working with arrays. The ?a placeholder expands out an array to a comma-separated list of escaped strings*.

For example:

$someArray = [1, 2, 5];
$galleries = $db->getAll("SELECT * FROM galleries WHERE id IN (?a)", $someArray);

* Note that since MySQL performs automatic type coercion, it doesn't matter that SafeMySQL will convert the ids above to strings - you'll still get the correct result.

How to change the foreign key referential action? (behavior)

You can do this in one query if you're willing to change its name:

ALTER TABLE table_name
  DROP FOREIGN KEY `fk_name`,
  ADD CONSTRAINT `fk_name2` FOREIGN KEY (`remote_id`)
    REFERENCES `other_table` (`id`)

This is useful to minimize downtime if you have a large table.

anaconda/conda - install a specific package version

There is no version 1.3.0 for rope. 1.3.0 refers to the package cached-property. The highest available version of rope is 0.9.4.

You can install different versions with conda install package=version. But in this case there is only one version of rope so you don't need that.

The reason you see the cached-property in this listing is because it contains the string "rope": "cached-p rope erty"

py35_0 means that you need python version 3.5 for this specific version. If you only have python3.4 and the package is only for version 3.5 you cannot install it with conda.

I am not quite sure on the defaults either. It should be an indication that this package is inside the default conda channel.

How do I ignore ampersands in a SQL script running from SQL Plus?

This may work for you:

set define off

Otherwise the ampersand needs to be at the end of a string,

'StackOverflow &' || ' you'

EDIT: I was click-happy when saving... This was referenced from a blog.

How can I align text in columns using Console.WriteLine?

Do some padding, i.e.

          public static void prn(string fname, string fvalue)
                string outstring = fname.PadRight(20)  +"\t\t  " + fvalue;


This worked well, at least for me.

Convert laravel object to array

this worked for me in laravel 5.4

$partnerProfileIds = DB::table('partner_profile_extras')->get()->pluck('partner_profile_id');
$partnerProfileIdsArray = $partnerProfileIds->all();


array:4 [?
  0 => "8219c678-2d3e-11e8-a4a3-648099380678"
  1 => "28459dcb-2d3f-11e8-a4a3-648099380678"
  2 => "d5190f8e-2c31-11e8-8802-648099380678"
  3 => "6d2845b6-2d3e-11e8-a4a3-648099380678"

Creating a Pandas DataFrame from a Numpy array: How do I specify the index column and column headers?

Adding to @behzad.nouri 's answer - we can create a helper routine to handle this common scenario:

def csvDf(dat,**kwargs): 
  from numpy import array
  data = array(dat)
  if data is None or len(data)==0 or len(data[0])==0:
    return None
    return pd.DataFrame(data[1:,1:],index=data[1:,0],columns=data[0,1:],**kwargs)

Let's try it out:

data = [['','a','b','c'],['row1','row1cola','row1colb','row1colc'],

In [61]: csvDf(data)
             a         b         c
row1  row1cola  row1colb  row1colc
row2  row2cola  row2colb  row2colc
row3  row3cola  row3colb  row3colc

Optimal way to concatenate/aggregate strings


The definition of optimal can vary, but here's how to concatenate strings from different rows using regular Transact SQL, which should work fine in Azure.

;WITH Partitioned AS
        COUNT(*) OVER (PARTITION BY ID) AS NameCount
    FROM dbo.SourceTable
Concatenated AS
        CAST(Name AS nvarchar) AS FullName, 
    FROM Partitioned 
    WHERE NameNumber = 1


        CAST(C.FullName + ', ' + P.Name AS nvarchar), 
    FROM Partitioned AS P
        INNER JOIN Concatenated AS C 
                ON P.ID = C.ID 
                AND P.NameNumber = C.NameNumber + 1
FROM Concatenated
WHERE NameNumber = NameCount


The approach boils down to three steps:

  1. Number the rows using OVER and PARTITION grouping and ordering them as needed for the concatenation. The result is Partitioned CTE. We keep counts of rows in each partition to filter the results later.

  2. Using recursive CTE (Concatenated) iterate through the row numbers (NameNumber column) adding Name values to FullName column.

  3. Filter out all results but the ones with the highest NameNumber.

Please keep in mind that in order to make this query predictable one has to define both grouping (for example, in your scenario rows with the same ID are concatenated) and sorting (I assumed that you simply sort the string alphabetically before concatenation).

I've quickly tested the solution on SQL Server 2012 with the following data:

INSERT dbo.SourceTable (ID, Name)
(1, 'Matt'),
(1, 'Rocks'),
(2, 'Stylus'),
(3, 'Foo'),
(3, 'Bar'),
(3, 'Baz')

The query result:

ID          FullName
----------- ------------------------------
2           Stylus
3           Bar, Baz, Foo
1           Matt, Rocks

Data binding to SelectedItem in a WPF Treeview

It can also be done using the IsSelected property of the TreeView item. Here's how I managed it,

public delegate void TreeviewItemSelectedHandler(TreeViewItem item);
public class TreeViewItem
  public static event TreeviewItemSelectedHandler OnItemSelected = delegate { };
  public bool IsSelected 
    get { return isSelected; }
      isSelected = value;
      if (value)

Then in the ViewModel that contains the data your TreeView is bound to, just subscribe to the event in the TreeViewItem class.

TreeViewItem.OnItemSelected += TreeViewItemSelected;

And finally, implement this handler in the same ViewModel,

private void TreeViewItemSelected(TreeViewItem item)
  //Do something

And the binding of course,

<Setter Property="IsSelected" Value="{Binding IsSelected}" />    

What is the "proper" way to cast Hibernate Query.list() to List<Type>?

To answer your question, there is no "proper way" to do that. Now if it's just the warning that bothers you, the best way to avoid its proliferation is to wrap the Query.list() method into a DAO :

public class MyDAO {

    public static <T> List<T> list(Query q){
        return q.list();

This way you get to use the @SuppressWarnings("unchecked") only once.

Nesting await in Parallel.ForEach

Wrap the Parallel.Foreach into a Task.Run() and instead of the await keyword use [yourasyncmethod].Result

(you need to do the Task.Run thing to not block the UI thread)

Something like this:

var yourForeachTask = Task.Run(() =>
            Parallel.ForEach(ids, i =>
                ICustomerRepo repo = new CustomerRepo();
                var cust = repo.GetCustomer(i).Result;
await yourForeachTask;

Disable click outside of bootstrap modal area to close modal

There are two ways to disable click outside of bootstrap model area to close modal-

  1. using javascript

       backdrop: 'static',
       keyboard: false
  2. using data attribute in HTML tag

    data-backdrop="static" data-keyboard="false" //write this attributes in that button where you click to open the modal popup.

How can I find the OWNER of an object in Oracle?

You can query the ALL_OBJECTS view:

select owner
     , object_name
     , object_type
 where object_name = 'FOO'

To find synonyms:

select *
 where synonym_name = 'FOO'

Just to clarify, if a user user's SQL statement references an object name with no schema qualification (e.g. 'FOO'), Oracle FIRST checks the user's schema for an object of that name (including synonyms in that user's schema). If Oracle can't resolve the reference from the user's schema, Oracle then checks for a public synonym.

If you are looking specifically for constraints on a particular table_name:

select c.*
  from all_constraints c 
 where c.table_name = 'FOO'
 union all
select cs.*
  from all_constraints cs
  join all_synonyms s 
    on (s.table_name = cs.table_name
     and s.table_owner = cs.owner 
     and s.synonym_name = 'FOO'


-- addendum:

If your user is granted access to the DBA_ views (e.g. if your user has been granted SELECT_CATALOG_ROLE), you can substitute 'DBA_' in place of 'ALL_' in the preceding SQL examples. The ALL_x views only show objects which you have been granted privileges. The DBA_x views will show all database objects, whether you have privileges on them or not.

Multiple submit buttons in the same form calling different Servlets

If you use jQuery, u can do it like this:

<form action="example" method="post" id="loginform">
  <input id="btnin" type="button" value="login"/>
  <input id="btnreg" type="button" value="regist"/>

And js will be:

   $("#loginform").attr("action", "user_login");
   $("#loginform").attr("action", "user_regist");

Move SQL Server 2008 database files to a new folder location

You forgot to mention the name of your database (is it "my"?).



   Name = my_Data,
   Filename = 'D:\DATA\my.MDF'

   Name = my_Log, 
   Filename = 'D:\DATA\my_1.LDF'

Now here you must manually move the files from their current location to D:\Data\ (and remember to rename them manually if you changed them in the MODIFY FILE command) ... then you can bring the database back online:



This assumes that the SQL Server service account has sufficient privileges on the D:\Data\ folder. If not you will receive errors at the SET ONLINE command.

Footnotes for tables in LaTeX

If your table is already working with tabular, then easiest is to switch it to longtable, remembering to add


For example:

  2014--2015 & Something cool\footnote{first footnote} \\
  2016-- & Something cooler\footnote{second footnote}

How to make code wait while calling asynchronous calls like Ajax

If you need wait until the ajax call is completed all do you need is make your call synchronously.

laravel 5.5 The page has expired due to inactivity. Please refresh and try again

Verify that your config/session.php file contains this line

'domain' => env('SESSION_DOMAIN', null),

Then remove the SESSION_DOMAIN line in your .env file

Sum across multiple columns with dplyr

If you want to sum certain columns only, I'd use something like this:

df %>% select(x3:x5) %>% rowSums(na.rm=TRUE) -> df$

This way you can use dplyr::select's syntax.

toBe(true) vs toBeTruthy() vs toBeTrue()

Disclamer: This is just a wild guess

I know everybody loves an easy-to-read list:

  • toBe(<value>) - The returned value is the same as <value>
  • toBeTrue() - Checks if the returned value is true
  • toBeTruthy() - Check if the value, when cast to a boolean, will be a truthy value

    Truthy values are all values that aren't 0, '' (empty string), false, null, NaN, undefined or [] (empty array)*.

    * Notice that when you run !![], it returns true, but when you run [] == false it also returns true. It depends on how it is implemented. In other words: (!![]) === ([] == false)

On your example, toBe(true) and toBeTrue() will yield the same results.

Replace a string in a file with nodejs

ES2017/8 for Node 7.6+ with a temporary write file for atomic replacement.

const Promise = require('bluebird')
const fs = Promise.promisifyAll(require('fs'))

async function replaceRegexInFile(file, search, replace){
  let contents = await fs.readFileAsync(file, 'utf8')
  let replaced_contents = contents.replace(search, replace)
  let tmpfile = `${file}.jstmpreplace`
  await fs.writeFileAsync(tmpfile, replaced_contents, 'utf8')
  await fs.renameAsync(tmpfile, file)
  return true

Note, only for smallish files as they will be read into memory.

How to implement history.back() in angular.js

For me, my problem was I needed to navigate back and then transition to another state. So using $window.history.back() didn't work because for some reason the transition happened before history.back() occured so I had to wrap my transition in a timeout function like so.

setTimeout(function() {
  $state.transitionTo(""); }, 100);

This fixed my issue.

Override hosts variable of Ansible playbook from the command line

We use a simple fail task to force the user to specify the Ansible limit option, so that we don't execute on all hosts by default/accident.

The easiest way I found is this:

- name: Force limit
  # 'all' is okay here, because the fail task will force the user to specify a limit on the command line, using -l or --limit
  hosts: 'all'

  - name: checking limit arg
      msg: "you must use -l or --limit - when you really want to use all hosts, use -l 'all'"
    when: ansible_limit is not defined
    run_once: true

Now we must use the -l (= --limit option) when we run the playbook, e.g.

ansible-playbook playbook.yml -l

Limit option docs:

Limit to one or more hosts This is required when one wants to run a playbook against a host group, but only against one or more members of that group.

Limit to one host

ansible-playbook playbooks/PLAYBOOK_NAME.yml --limit "host1"

Limit to multiple hosts

ansible-playbook playbooks/PLAYBOOK_NAME.yml --limit "host1,host2"

Negated limit.
NOTE: Single quotes MUST be used to prevent bash interpolation.

ansible-playbook playbooks/PLAYBOOK_NAME.yml --limit 'all:!host1'

Limit to host group

ansible-playbook playbooks/PLAYBOOK_NAME.yml --limit 'group1'

Toggle input disabled attribute using jQuery

Quite a while later, and thanks to @arne, I created this similar small function to handle where the input should be disabled AND hidden, or enabled AND shown:

function toggleInputState(el, on) {
  // 'on' = true(visible) or false(hidden)
  // If a field is to be shown, enable it; if hidden, disable it.
  // Disabling will prevent the field's value from being submitted
  $(el).prop('disabled', !on).toggle(on);

Then a jQuery object (such as $('input[name="something"]') ) is simply switched using:

toggleInputState(myElement, myBoolean)

Iterating Over Dictionary Key Values Corresponding to List in Python

Dictionaries have a built in function called iterkeys().


for team in league.iterkeys():
    runs_scored = float(league[team][0])
    runs_allowed = float(league[team][1])
    win_percentage = round((runs_scored**2)/((runs_scored**2)+(runs_allowed**2))*1000)
    print win_percentage

Excel select a value from a cell having row number calculated

You could use the INDIRECT function. This takes a string and converts it into a range

More info here


But it's preferable to use INDEX as it is less volatile.


This returns a value or the reference to a value from within a table or range

More info here

Put either function into cell B2 and fill down.

Await operator can only be used within an Async method

You can only use await in an async method, and Main cannot be async.

You'll have to use your own async-compatible context, call Wait on the returned Task in the Main method, or just ignore the returned Task and just block on the call to Read. Note that Wait will wrap any exceptions in an AggregateException.

If you want a good intro, see my async/await intro post.

How to find out if an item is present in a std::vector?

Use the STL find function.

Keep in mind that there is also a find_if function, which you can use if your search is more complex, i.e. if you're not just looking for an element, but, for example, want see if there is an element that fulfills a certain condition, for example, a string that starts with "abc". (find_if would give you an iterator that points to the first such element).

How to create a GUID/UUID using iOS

The simplest technique is to use NSString *uuid = [[NSProcessInfo processInfo] globallyUniqueString]. See the NSProcessInfo class reference.

How to create a oracle sql script spool file

With spool:

  set heading off
  set arraysize 1
  set newpage 0
  set pages 0
  set feedback off
  set echo off
  set verify off

variable cd varchar2(10);
variable d number;

 ab varchar2(10) := 'Raj';
 a number := 10;
 c number;
 c := a+10;
 select ab,c into :cd,:d from dual;

 select :cd,:d from dual;

IIS_IUSRS and IUSR permissions in IIS8

I would use specific user (and NOT Application user). Then I will enable impersonation in the application. Once you do that whatever account is set as the specific user, those credentials would used to access local resources on that server (Not for external resources).

Specific User setting is specifically meant for accessing local resources.

selecting rows with id from another table

Try this (subquery):

   (SELECT term_id FROM terms_relation WHERE taxonomy = "categ")

Or you can try this (JOIN):

SELECT t.* FROM terms AS t 
   INNER JOIN terms_relation AS tr 
   ON = tr.term_id AND tr.taxonomy = "categ"

If you want to receive all fields from two tables:

SELECT,, t.slug, tr.description, tr.created_at, tr.updated_at 
  FROM terms AS t 
   INNER JOIN terms_relation AS tr 
   ON = tr.term_id AND tr.taxonomy = "categ"

Download text/csv content as files from server in Angular

Most of the references on the web about this issue point out to the fact that you cannot download files via ajax call 'out of the box'. I have seen (hackish) solutions that involve iframes and also solutions like @dcodesmith's that work and are perfectly viable.

Here's another solution I found that works in Angular and is very straighforward.

In the view, wrap the csv download button with <a> tag the following way :

<a target="_self" ng-href="{{csv_link}}">
  <button>download csv</button>

(Notice the target="_self there, it's crucial to disable Angular's routing inside the ng-app more about it here)

Inside youre controller you can define csv_link the following way :

$scope.csv_link = '/orders' + $;

(the $ is optional and onlt if you want to pass additionaly search query to your server)

Now everytime you click the button, it should start downloading.

MySQL Delete all rows from table and reset ID to zero

Do not delete, use truncate:

Truncate table XXX

The table handler does not remember the last used AUTO_INCREMENT value, but starts counting from the beginning. This is true even for MyISAM and InnoDB, which normally do not reuse sequence values.


What is the size limit of a post request?

It is up to the http server to decide if there is a limit. The product I work on allows the admin to configure the limit.

Remove all files except some from a directory


rm $(ls -I "*.txt" ) #Deletes file type except *.txt


rm $(ls -I "*.txt" -I "*.pdf" ) #Deletes file types except *.txt & *.pdf

Java collections convert a string to a list of characters

In Java8 you can use streams I suppose. List of Character objects:

List<Character> chars = str.chars()

And set could be obtained in a similar way:

Set<Character> charsSet = str.chars()

How to get href value using jQuery?

**Replacing  href attribut value to other** 
 <div class="cpt">
   <a href="/ref/ref/testone.html">testoneLink</a>

  <div class="test" >
      <a href="/ref/ref/testtwo.html">testtwoLInk</a>

 <!--Remove first default Link from href attribut -->
     Remove first default Link from href attribut
    $(".cpt a").removeAttr("href");
    Add  Link to same href attribut
    var testurl= $(".test").find("a").attr("href");
    $(".test a").attr('href', testurl);

How to capitalize first letter of each word, like a 2-word city?

function convertCase(str) {
  var lower = String(str).toLowerCase();
  return lower.replace(/(^| )(\w)/g, function(x) {
    return x.toUpperCase();

Hiding a sheet in Excel 2007 (with a password) OR hide VBA code in Excel

Here is what you do in Excel 2003:

  1. In your sheet of interest, go to Format -> Sheet -> Hide and hide your sheet.
  2. Go to Tools -> Protection -> Protect Workbook, make sure Structure is selected, and enter your password of choice.

Here is what you do in Excel 2007:

  1. In your sheet of interest, go to Home ribbon -> Format -> Hide & Unhide -> Hide Sheet and hide your sheet.
  2. Go to Review ribbon -> Protect Workbook, make sure Structure is selected, and enter your password of choice.

Once this is done, the sheet is hidden and cannot be unhidden without the password. Make sense?

If you really need to keep some calculations secret, try this: use Access (or another Excel workbook or some other DB of your choice) to calculate what you need calculated, and export only the "unclassified" results to your Excel workbook.

Is it possible to CONTINUE a loop from an exception?

How about the ole goto statement (i know, i know, but it works just fine here ;)

   v_attr char(88);
    FOR user_rec IN SELECT_USERS LOOP    
            SELECT attr INTO v_attr 
            WHERE user_id =;            
               -- user does not have attribute, continue loop to next record.
               goto end_loop;


Just put end_loop at very end of loop of course. The null can be substituted with a commit maybe or a counter increment maybe, up to you.

Calling filter returns <filter object at ... >

It looks like you're using python 3.x. In python3, filter, map, zip, etc return an object which is iterable, but not a list. In other words,

filter(func,data) #python 2.x

is equivalent to:

list(filter(func,data)) #python 3.x

I think it was changed because you (often) want to do the filtering in a lazy sense -- You don't need to consume all of the memory to create a list up front, as long as the iterator returns the same thing a list would during iteration.

If you're familiar with list comprehensions and generator expressions, the above filter is now (almost) equivalent to the following in python3.x:

( x for x in data if func(x) ) 

As opposed to:

[ x for x in data if func(x) ]

in python 2.x

How to set selected value from Combobox?

In order to do the database style ComboBoxes manually trying to setup a relationship between a number (internal) and some text (visible), I've found you have to:

  1. Store you items in a list (You are close - except the string,string - need int,string)
  2. DataSource property to the list (You are good)
  3. DataMember,DataValue (You are good)
  4. Load default value (You are good)
  5. Put in value from database (Your question)
  6. Get value to put back in database (Your next question)

First things first. Change your KeyValuePair to so it looks like:

(0,"Select") (1,"Option 1")

Now, when you run your sql "Select empstatus from employees where blah" and get back an integer, you need to set the combobox without wasting a bunch of time.

Simply: *** SelectedVALUE - not Item ****

cmbEmployeeStatus.SelectedValue = 3;   //or

cmbEmployeeStatus.SelectedValue = intResultFromQuery;   

This will work whether you have manually loaded the combobox with code values, as you did, or if you load the comboBox from a query.

If your foreign keys are integers, (which for what I do, they all are), life is easy. After the user makes the change to the comboBox, the value you will store in the database is SelectedValue. (Cast to int as needed.)

Here is my code to set the ComboBox to the value from the database:

if (t is DBInt) //Typical for ComboBox stuff
    cb.SelectedValue = ((DBInt)t).value;

And to retrieve:

((DBInt)t).value = (int) cb.SelectedValue;

DBInt is a wrapper for an Integer, but this is part of my ORM that gives me manual control over databinding, and reduces code errors.

Why did I answer this so late? I was struggling with this also, as there seems to be no good info on the web about how to do this. I figured it out, and thought I'd be nice and post it for someone else to see.

Contains case insensitive

Here's my take:


var originalText = $("#textContainer").html()
$("#search").on('keyup', function () {
  var text = $("#textContainer").html()
  var val = $("#search").val()
  if(val=="") return;
  var matches = text.split(val)
  for(var i=0;i<matches.length-1;i++) {
    var ind =  matches[i].indexOf(val)
    var len = val.length
      matches[i] = matches[i] + "<span class='selected'>" + val + "</span>"


<input type="text" id="search">
<div id="textContainer">
lorem ipsum is simply dummy text of the printing and typesetting industry. lorem ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of letraset sheets containing lorem ipsum passages, and more recently with desktop publishing software like Aldus pagemaker including versions of lorem ipsum.</div>


Is there a C# String.Format() equivalent in JavaScript?

Based on @Vlad Bezden answer I use this slightly modified code because I prefer named placeholders:

String.prototype.format = function(placeholders) {
    var s = this;
    for(var propertyName in placeholders) {
        var re = new RegExp('{' + propertyName + '}', 'gm');
        s = s.replace(re, placeholders[propertyName]);
    return s;


"{greeting} {who}!".format({greeting: "Hello", who: "world"})

String.prototype.format = function(placeholders) {_x000D_
    var s = this;_x000D_
    for(var propertyName in placeholders) {_x000D_
        var re = new RegExp('{' + propertyName + '}', 'gm');_x000D_
        s = s.replace(re, placeholders[propertyName]);_x000D_
    }    _x000D_
    return s;_x000D_
$("#result").text("{greeting} {who}!".format({greeting: "Hello", who: "world"}));
<script src=""></script>_x000D_
<div id="result"></div>

Can I access a form in the controller?

This answer is a little late, but I stumbled upon a solution that makes everything a LOT easier.

You can actually assign the form name directly to your controller if you're using the controllerAs syntax and then reference it from your "this" variable. Here's how I did it in my code:

I configured the controller via ui-router (but you can do it however you want, even in the HTML directly with something like <div ng-controller="someController as myCtrl">) This is what it might look like in a ui-router configuration:

views: {
            "": {
                templateUrl: "someTemplate.html",
                controller: "someController",
                controllerAs: "myCtrl"

and then in the HTML, you just set the form name as the "controllerAs"."name" like so:

<ng-form name="myCtrl.someForm">
    <!-- example form code here -->
    <input name="firstName" ng-model="myCtrl.user.firstName" required>

now inside your controller you can very simply do this:

        function ($scope) {
            var vm = this;
              // do something

How to give the background-image path in CSS?

Your css is here: Project/Web/Support/Styles/file.css

1 time ../ means Project/Web/Support and 2 times ../ i.e. ../../ means Project/Web


background-image: url('../../images/image.png');

"Untrusted App Developer" message when installing enterprise iOS Application

For iOS 13.6

Go to settings -> General -> Device Management -> Click on Trust « Apple Development » -> Click on the red trust button and you’re all set! Enjoy

Permanently add a directory to PYTHONPATH?

Adding export PYTHONPATH="${PYTHONPATH}:/my/other/path" to the ~/.bashrc might not work if PYTHONPATH does not currently exist (because of the :).

export PYTHONPATH="/my/other/path1"
export PYTHONPATH="${PYTHONPATH}:/my/other/path2"

Adding the above to my ~/.bashrc did the trick for me on Ubuntu 16.04

What does ==$0 (double equals dollar zero) mean in Chrome Developer Tools?

I will say It 's just shorthand syntax for get reference of html element during debugging time , normaly these kind of task will perform by these method

document.getElementById , document.getElementsByClassName , document.querySelector

so clicking on an html element and getting a reference variable ($0) in console is a huge time saving during the day

how to convert rgb color to int in java

You may declare a value in color.xml, and thus you can get integer value by calling the code below.

context.getColor(int resId);