Tutorial by Examples: ga

Forward messages one object to another by delegates, multicasting these messages to multiple observers.. Step 1:- Create NSObject class of RRMulticastDelegate Step 2:- Following code implement in RRMulticastDelegate.h file #import <Foundation/Foundation.h> @interface RRMulticastDelegate ...

If for some reason using the Symfony Installer is not an option, you can also create a new project using Composer. First of all, make sure you have installed Composer. Next, you can use the create-project command to create a new project: composer create-project symfony/framework-standard-edition m...

When a window contains many widgets, they might not all be visible. However, neither a window (Tk or Toplevel instance) nor a Frame are scrollable. One solution to make the window content scrollable is to put all the widgets in a Frame, and then, embed this Frame in a Canvas using the create_window ...

Most of the time, you will want to render HTML responses from a template instead of hard-coding the HTML in your controller. Also, your templates will not be static but will contain placeholders for application data. By default Symfony comes with Twig, a powerful templating language. In order to us...

Sometimes you want to return a 404 (Not Found) response, because the requested resource does not exist. Symfony allows you to do so by throwing a NotFoundHttpException. The Symfony base Controller exposes a createNotFoundException method which creates the exception for you: public function indexAc...

It's really easy to define the functions. Function GetAreaOfARectangle(ByVal Edge1 As Integer, ByVal Edge2 As Integer) As Integer Return Edge1 * Edge2 End Function Dim Area As Integer = GetAreaOfARectangle(5, 8) Console.Writeline(Area) 'Output: 40

Function Age(ByVal YourAge As Integer) As String Select Case YourAge Case Is < 18 Return("You are younger than 18! You are teen!") Case 18 to 64 Return("You are older than 18 but younger than 65! You are adult!") Cas...

Lets say we want to build a paginated list of products, where the number of the page is passed as a query string parameter. For instance, to fetch the 3rd page, you'd go to: http://example.com/products?page=3 The raw HTTP request would look something like this: GET /products?page=3 HTTP/1.1 Ho...

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...

To get the contents of a form that is submitted with method="post", use the post property: $name = $request->request->get('name');

Using the command git tag lists out all available tags: $ git tag <output follows> v0.1 v1.3 Note: the tags are output in an alphabetical order. One may also search for available tags: $ git tag -l "v1.8.5*" <output follows> v1.8.5 v1.8.5-rc0 v1.8.5-rc1 v1.8.5...

Detailed instructions on getting windows-installer set up or installed.

Associated objects are useful when you want to add functionality to existing classes which requires holding state. For example, adding a activity indicator to every UIView: Objective-C Implementation #import <objc/runtime.h> static char ActivityIndicatorKey; @implementation UIView (Ac...

When generating new Angular 2 components in a .NET Core project, you may run into the following errors (as of version 0.8.3): Error locating module for declaration SilentError: No module files found OR No app module found. Please add your new Class to your component. Identica...

Like other value types, GUID also has a nullable type which can take null value. Declaration : Guid? myGuidVar = null; This is particularly useful when retrieving data from the data base when there is a possibility that value from a table is NULL.

import javax.swing.*; import java.awt.*; public class MyPanel extends JPanel { @Override public void paintComponent(Graphics g){ // clear the previous painting super.paintComponent(g); Graphics2D g2 = (Graphics2D)g; g2.setColor(Co...

Dim rng As New Random() This declares an instance of the Random class called rng. In this case, the current time at the point where the object is created is used to calculate the seed. This is the most common usage, but has its own problems as we shall see later in the remarks Instead of allowin...

Suppose there is a peak of normally (gaussian) distributed data (mean: 3.0, standard deviation: 0.3) in an exponentially decaying background. This distribution can be fitted with curve_fit within a few steps: 1.) Import the required libraries. 2.) Define the fit function that is to be fitted to th...

We can call an action result in another action result. public ActionResult Action1() { ViewData["OutputMessage"] = "Hello World"; return RedirectToAction("Action2","ControllerName"); //this will go to second action; } public ActionResult...

Suppose that you need to define a dropdown menu for a particular Acumatica screen, such as the Reports menu on the following screenshot. This can be achieved in three different ways: By adding a toolbar with a menu item to the screen's ASPX By declaring a special "folder" action to ...