Tutorial by Examples: l

When are bit-fields useful?

A bit-field is used to club together many variables into one object, similar to a structure. This allows for reduced memory usage and is especially useful in an embedded environment. e.g. consider the following variables having the ranges as given below. a --> range 0 - 3 b --> range 0 -...

C Language • Bit-fields

Splitting text strings over multiple lines

- Without quotes: You can just split a long piece of text like this. - With quotes: "[But be careful: if you \"need\" punctuation, put double quotes around it. You can ev\ en split without spaces by using backslashes." - Or single quotes: 'This wor...

yaml • Getting started with yaml

Basic PL/pgSQL Trigger Function

This is a simple trigger function. CREATE OR REPLACE FUNCTION my_simple_trigger_function() RETURNS trigger AS $BODY$ BEGIN -- TG_TABLE_NAME :name of the table that caused the trigger invocation IF (TG_TABLE_NAME = 'users') THEN --TG_OP : operation the trigger was fired IF (TG_O...

postgresql • Triggers and Trigger Functions

_design/example

Design documents contain application logic. Any document in a database that has an _id starting with "_design/" can be used as design document. Usually there is one design document for each application. { "_id": "_design/example", "view": { ...

couchdb • Design Documents

Assignments model in PL/SQL

All programming languages allow us to assign values to variables. Usually, a value is assigned to variable, standing on left side. The prototype of the overall assignment operations in any contemporary programming language looks like this: left_operand assignment_operand right_operand instructions_...

plsql • Assignments model and language

Setting and getting pixel values of a Gray image in C++

// PixelAccessTutorial.cpp : Defines the entry point for the console // Environment: Visual studio 2015, Windows 10 // Assumptions: Opecv is installed configured in the visual studio project // Opencv version: OpenCV 3.1 #include "stdafx.h" #include<opencv2/core/core.hpp> #i...

opencv • Pixel Access

Angular 2 for-loop

For live plnkr click... <!doctype html> <html> <head> <title>ng for loop in angular 2 with ES5.</title> <script type="text/javascript" src="https://code.angularjs.org/2.0.0-alpha.28/angular2.sfx.dev.js"></script> <scr...

Angular 2 • Angular - ForLoop

Selecting by multiple criteria [C#]

It's also possible to use selectors together. This is done by using the OpenQA.Selenium.Support.PageObjects.ByChained object: element = driver.FindElement(new ByChained(By.TagName("input"), By.ClassName("class")); Any number of Bys can be chained and are used as an AND type ...

selenium-webdriver • Locating Web Elements

Canny Algorithm - C++

Below is an usage of canny algorithm in c++. Note that the image is first converted to grayscale image, then Gaussian filter is used to reduce the noise in the image. Then Canny algorithm is used for edge detection. // CannyTutorial.cpp : Defines the entry point for the console application. // En...

opencv • Edge detection

Reading .gz textfile line after line

This class open a .gz file (usual format of compressed log files) and will return a line at each call of .NextLine() There is no memory usage for temporary decompression, very useful for large file. Imports System.IO Class logread_gz Private ptr As FileStream Private UnGZPtr As Compress...

Visual Basic .NET Language • Reading compressed textfile on-the-fly

Working with nested looping

Here is the JSON Structure we are going to use. { "employees": [ { "firstName": "John", "lastName": "Doe", "skills": [ { "name": "javascript", "rating&quo...

knockout.js • Working with knockout foreach binding with JSON

Extract the text contents from a div with a particular id

Taggy-lens allows us to use lenses to parse and inspect HTML documents. #!/usr/bin/env stack -- stack --resolver lts-7.0 --install-ghc runghc --package text --package lens --package taggy-lens {-# LANGUAGE OverloadedStrings #-} import qualified Data.Text.Lazy as TL import qualified Data.Tex...

Haskell Language • Parsing HTML with taggy-lens and lens

Installation or Setup

Detailed instructions on getting phonegap-build set up or installed.

phonegap-build • Getting started with phonegap-build

Android Studio update channels

Overview Android Studio's built-in update mechanism can be set to receive updates through any one of these four channels: Canary: Bleeding edge, released about weekly. These are early previews released in order to obtain real-world feedback during development. The canary channel will always have...

android-studio • Android Studio updates

Installation or Setup

Detailed instructions on getting retrofit set up or installed.

retrofit • Getting started with retrofit

Explicit Subscription to Observables

var person = { name: ko.observable('John') }; console.log(person.name()); console.log('Update name'); person.name.subscribe(function(newValue) { console.log("Updated value is " + newValue); }); person.name('Jane');

knockout.js • Observables

Simple stubbing

Sometimes there are sections of code that are difficult to test, such as accessing a database, or interacting with the user. You can stub out those sections of code, allowing the rest of the code to be tested. Let's start with a class that prompts the user. For simplicity, it has only two methods...

phpunit • Test Doubles (Mocks and Stubs)

Installation of OpenXML SDK and productivity tool on your computer

Go to the Microsoft link for the OpenXML SDK download. Click the red download button. On the next screen click the box next to OpenXMLSDKToolV25.msi and click next to begin the download. Once the download is complete, launch the OpenXMLSDKToolV25.msi and follow the instructions on the screen. Th...

openxml • Getting started with openxml

Creating a new project from the Game template.

To set up a default SceneKit project you can use the Game Template.

scenekit • Getting started with scenekit

INSERT data and RETURING values

If you are inserting data into a table with an auto increment column and if you want to get the value of the auto increment column. Say you have a table called my_table: CREATE TABLE my_table ( id serial NOT NULL, -- serial data type is auto incrementing four-byte integer name character varying...

postgresql • INSERT