Tutorial by Examples: en

Generate tone of a specific frequency

To play a sound of with a specific tone,we first have to create a sine wave sound.This is done in the following way. final int duration = 10; // duration of sound final int sampleRate = 22050; // Hz (maximum frequency is 7902.13Hz (B8)) final int numSamples = duration * sampleRate; final double ...

Android • AudioTrack

Enabling rerere

To enable rerere run the following command: $ git config --global rerere.enabled true This can be done in a specific repository as well as globally.

Git • Git rerere

Create PDF from any Microsoft Document loaded in UIWebview

#define kPaperSizeA4 CGSizeMake(595.2,841.8) First of all implement UIPrintPageRenderer protocol @interface UIPrintPageRenderer (PDF) - (NSData*) printToPDF; @end @implementation UIPrintPageRenderer (PDF) - (NSData*) printToPDF { NSMutableData *pdfData = [NSMutableData data]; ...

iOS • PDF Creation in iOS

Opening browser window with specific URL using Selenium Webdriver in Java

import org.openqa.selenium.WebDriver; import org.openqa.selenium.firefox.FirefoxDriver; class test_webdriver{ public static void main(String[] args) { WebDriver driver = new FirefoxDriver(); driver.get("http://stackoverflow.com/"); driver.close(); } }...

selenium-webdriver • Using Selenium Webdriver with Java

Class Component

@Component({ selector: 'zippy', template: ` <div class="zippy"> <div (click)="toggle()">Toggle</div> <div [hidden]="!visible"> <ng-content></ng-content> </div> </div>`}) export class Zippy...

Angular 2 • EventEmitter Service

Emmiting Events

Angular 2 • EventEmitter Service

Catching the event

Create a service- import {EventEmitter} from 'angular2/core'; export class NavService { navchange: EventEmitter<number> = new EventEmitter(); constructor() {} emitNavChangeEvent(number) { this.navchange.emit(number); } getNavChangeEmitter() { return...

Angular 2 • EventEmitter Service

SMTPClient - Mail with .txt file in body message

# Define the txt which will be in the email body $Txt_File = "c:\file.txt" function Send_mail { #Define Email settings $EmailFrom = "[email protected]" $EmailTo = "[email protected]" $Txt_Body = Get-Content $Txt_File -RAW $Body = $Body_...

PowerShell • Sending Email

Destructuring Block Arguments

triples = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] triples.each { |(first, second, third)| puts second } # 2 # 5 # 8 triples.map { |(first, *rest)| rest.join(' ') } # => ["2 3", "5 6", "8 9"]

Ruby Language • Destructuring

Named Arguments avoids bugs on optional parameters

Always use Named Arguments to optional parameters, to avoid potential bugs when the method is modified. class Employee { public string Name { get; private set; } public string Title { get; set; } public Employee(string name = "<No Name>", string title = "&lt...

C# Language • Named Arguments

Perform basic database operations using credentials stored in wp-config.php

Create a new database. $ wp db create Drop an existing database. $ wp db drop --yes Reset the current database. $ wp db reset --yes Execute a SQL query stored in a file. $ wp db query < debug.sql

WordPress • WP-CLI

Inheriting Signals on Extended Models

Django's signals are restricted to precise class signatures upon registration, and thus subclassed models are not immediately registered onto the same signal. Take this model and signal for example class Event(models.Model): user = models.ForeignKey(User) class StatusChange(Event): ...

Django • Signals

Serialize and Send python RDD to scala code

This part of development you should serialize the python RDD to the JVM. This process uses the main development of Spark to call the jar function. from pyspark.serializers import PickleSerializer, AutoBatchedSerializer rdd = sc.parallelize(range(10000)) reserialized_rdd = rdd._reserialize(Aut...

apache-spark • Calling scala jobs from pyspark

Mutable and Immutable as Arguments

One of the major use case when a developer needs to take mutability into account is when passing arguments to a function. This is very important, because this will determine the ability for the function to modify objects that doesn't belong to its scope, or in other words if the function has side ef...

Python Language • Mutable vs Immutable (and Hashable) in Python

Encryption and Decryption using Cryptography (AES)

Decryption Code public static string Decrypt(string cipherText) { if (cipherText == null) return null; byte[] cipherBytes = Convert.FromBase64String(cipherText); using (Aes encryptor = Aes.Create()) { Rfc2898DeriveBytes pdb = ...

.NET Framework • Encryption / Cryptography

Replacing fragments with ajax

If you want to replace parts of your website, ajax is an easy way to do it. The website.html where you want to replace the content based on the selected value: <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"> ...

thymeleaf • Getting started with thymeleaf

Adding the "Theme page title" item to the nav bar

Code function add_the_theme_page(){ add_menu_page('Theme page title', 'Theme menu label', 'manage_options', 'theme-options', 'page_content', 'dashicons-book-alt'); } add_action('admin_menu', 'add_the_theme_page'); function page_content(){ echo '<div class="wrap"><h2&...

WordPress • add_menu_page()

Adding the "Submenu Page" as a sub-page of "Tools" to the nav bar

Code add_action('admin_menu', 'register_my_custom_submenu_page'); function register_my_custom_submenu_page() { add_submenu_page( 'tools.php', 'Submenu Page', 'My Custom Submenu Page', 'manage_options', 'my-custom-submenu-page', 'my_cust...

WordPress • add_submenu_page()

Creating a video with OpenCV (Java)

VideoWriter videoWriter; videoWriter = new VideoWriter(outputFile, VideoWriter.fourcc('x', '2','6','4'), fps, frameSize, isRGB); //We have stated that we will use x264 as codec with FourCC //For writing, we add the following method and it will write the image we give as parameter...

opencv • Creating a Video

Using Blocks for Recurring Elements

One of the most useful things that came along with sections is blocks. Blocks are basically a blueprint for something that can be created an unlimited amount of times. One of the best examples is the slides of a slider. A block is a top level item in the schema, meaning it is alongside things like n...

Shopify • Implementing Sections