Tutorial by Examples: re

Media stream containers usually have a several streams, such as a video stream and an audio stream. For example, you can get the audio stream using the following: // A Format Context - see Reading Data for more info AVFormatContext *formatContext; // Inspect packets of stream to determine prope...

Imagine that you need sort records by lowest value of either one of two columns. Some databases could use a non-aggregated MIN() or LEAST() function for this (... ORDER BY MIN(Date1, Date2)), but in standard SQL, you have to use a CASE expression. The CASE expression in the query below looks at th...

PHP exposes a number of so-called global variables which contain information about the HTTP request, such as $_POST, $_GET, $_FILES, $_SESSION, etc. The Request class contains a static createFromGlobals() method in order to instantiate a request object based on these variables: use Symfony\Componen...

use \Psr\Http\Message\ServerRequestInterface as Request; use \Psr\Http\Message\ResponseInterface as Response; require 'vendor/autoload.php'; $app = new \Slim\App; $app->get('/employee/view', function ($req, $res) { $con = new mysqli('localhost','USERNAME','PASSWORD','DATABASE'); ...

Sympy is made for symbolic math, so let's have a look at some basic integration and differentiation. from sympy import symbols, sqrt, exp, diff, integrate, pprint x, y = symbols(...

You can use django rest framework permission classes to check request headers and authenticate user requests Define your secret_key on project settings API_KEY_SECRET = 'secret_value' note: a good practice is to use environment variables to store this secret value. Define a permission ...

private void loadData(){ DatabaseReference dbRef = FirebaseDatabase.getInstance().getReference(); Query dataQuery = dbRef.child("chat").orderByChild("id").equalTo("user1"); dataQuery.addListenerForSingleValueEvent(new ValueEventListener() { ...

in Startup.cs // This method gets called by the runtime. Use this method to add services to the container. public void ConfigureServices(IServiceCollection services) { // Add framework services. services.AddMvc(); var controllerActivator = new CompositionRoot(); services...

One of the features in SugarCRM 7.x is being able to easily add and extend custom endpoints to accomplish what you require. In this example, we'll create a couple of custom endpoints to return some data about the request. This custom file is being placed in custom/clients/base/api/DescriptionAPI.p...

Both are used to define error handling for a website, but different software refers to different config elements. customErrors are a legacy (backwards compatable) element, used by Visual Studio Development Server (aka. VSDS or Cassini). httpErrors are the new element which is only used by IIS7. T...

Example of a TCA field configuration where you can select records from a table 'my_topfeatures' => array( 'label' => 'Select Topfeatures', 'config' => array( 'type' => 'group', 'internal_type' => 'db', 'size' => '4', ...

In Kotlin, if, try and others are expressions (so they do return a value) rather than (void) statements. So, for example, Kotlin does not have Java's ternary Elvis Operator, but you can write something like this: val i = if (someBoolean) 33 else 42 Even more unfamiliar, but equally expressive, ...

Since Git 2.13, multiple usernames and email addresses could be configured by using a folder filter. Example for Windows: .gitconfig Edit: git config --global -e Add: [includeIf "gitdir:D:/work"] path = .gitconfig-work.config [includeIf "gitdir:D:/opensource/"] ...

You can dynamically fork a flow in multiple subflows using groupBy. The continuing stages are applied to each subflow until you merge them back using mergeSubstreams. val sumByKey: Flow[(String, Int), Int, NotUsed] = Flow[(String, Int)]. groupBy(Int.maxValue, _._1). //forks the flow ...

If we want to remove some database connection from the list of database connections. we need to use QSqlDatabase::removeDatabase(),however it's a static function and the way it work is a little wired. // WRONG WAY QSqlDatabase db = QSqlDatabase::database("sales"); QSqlQuery query(&...

<build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>project-info-reports</artifactId> <version>2.9</version> <executions> ...

An Array Data Structure is used to store similar objects (or data values) in a contiguous block of memory. Array Data Structure has fixed size, which determines the number of data values that can be stored in it. Array : The C++ Way In C++ Programming Language, we can declare a static arr...

1- First all, install https://www.meteor.com/install 2- Create a project. (--bare is to create an empty project) meteor create --bare MyAwesomeProject 3- Create the minimal file structure (-p to create intermediate directories): cd MyAwesomeProject mkdir -p client server imports/api imports/ui/...

If necessary, change to your project directory cd MyAwesomeProject 1- Add react and react-router meteor npm install --save [email protected] [email protected] [email protected] 2- Edit client/main.html, and replace the content will be: <body> <div id="react-root"></div...

The simplest approach to the problem (and the most commonly used so far) is to split sentences into tokens. Simplifying, words have abstract and subjective meanings to the people using and receiving them, tokens have an objective interpretation: an ordered sequence of characters (or bytes). Once sen...