Tutorial by Examples: t

Infinite Loop

while true; do echo ok done or while :; do echo ok done or until false; do echo ok done

Bash • true, false and : commands

Function Return

function positive() { return 0 } function negative() { return 1 }

Bash • true, false and : commands

Code that will always/never be executed

if true; then echo Always executed fi if false; then echo Never executed fi

Bash • true, false and : commands

Show how to use cv::VideoCapture with e.g. a webcam. Capturing frames from webcam and display it. Here is the example code: #include <iostream> #include "opencv2/highgui/highgui.hpp" #include "opencv2/imgproc/imgproc.hpp" #include "opencv2/core/core.hpp" ...

opencv • Loading and Saving Various Media Formats

contact_picker.cs

using System; using Xamarin.Forms; namespace contact_picker { public class App : Application { public App () { // The root page of your application MainPage = new MyPage(); } protected override void OnStart () ...

Xamarin.Forms • Contact Picker - Xamarin Forms (Android and iOS)

ChooseContactPicker.cs

using System; using Xamarin.Forms; namespace contact_picker { public class ChooseContactPage : ContentPage { public ChooseContactPage () { } } }

Xamarin.Forms • Contact Picker - Xamarin Forms (Android and iOS)

ChooseContactActivity.cs

using Android.App; using Android.OS; using Android.Content; using Android.Database; using Xamarin.Forms; namespace contact_picker.Droid { [Activity (Label = "ChooseContactActivity")] public class ChooseContactActivity : Activity { public string type_num...

Xamarin.Forms • Contact Picker - Xamarin Forms (Android and iOS)

MainActivity.cs

using System; using Android.App; using Android.Content; using Android.Content.PM; using Android.Runtime; using Android.Views; using Android.Widget; using Android.OS; using Xamarin.Forms; namespace contact_picker.Droid { [Activity (Label = "contact_picker.Droid", Icon = &...

Xamarin.Forms • Contact Picker - Xamarin Forms (Android and iOS)

ChooseContactRenderer.cs

using UIKit; using AddressBookUI; using Xamarin.Forms; using Xamarin.Forms.Platform.iOS; using contact_picker; using contact_picker.iOS; [assembly: ExportRenderer (typeof(ChooseContactPage), typeof(ChooseContactRenderer))] namespace contact_picker.iOS { public partial class Choose...

Xamarin.Forms • Contact Picker - Xamarin Forms (Android and iOS)

Select: Project selected columns

Sample table (say Employee) structure Column NameDatatypeIDINTF_NameSTRINGL_NameSTRINGPhoneSTRINGAddressSTRING Project all the columns Use wild card * to project all the columns. e.g. Select * from Employee Project selected columns (say ID, Name) Use name of columns in the projection list. e...

hive • SELECT Statement

Common HTML Operations

If the input HTML DOM is <html> <body> <a>link</a> <div class='container' id='divone'> <p class='common' id='enclosedone'>Element One</p> <p class='common' id='enclosedtwo'>Element Two</p> ...

xpath • Getting started with xpath

Convert px to (r)em

To convert px to em or rem you can use the following function: @function rem-calc($size, $font-size : $font-size) { $font-size: $font-size + 0px; $remSize: $size / $font-size; @return #{$remSize}rem; } @function em-calc($size, $font-size : $font-size) { $font-size: $font-siz...

sass • Convert units

Bilateral Filtering

In image processing applications, the bilateral filters are a special type of non-linear filters. There is a trade off between loosing structure and noise removal, because the most popular method to remove noise is Gaussian blurring which is not aware of structure of image; therefore, it also remov...

opencv • Image Processing

Creating custom interceptors

Interceptors require the IInterceptor interface. Any public method within the intercepted class will be intercepted (including getters and setters) public class MyInterceptor : IInterceptor { public void Intercept(IInvocation invocation) { //Calls the next method in the chain - T...

castle-windsor • Interceptors

Hello World in the browser with SystemJS

Install systemjs and plugin-typescript npm install systemjs npm install plugin-typescript NOTE: this will install typescript 2.0.0 compiler which is not released yet. For TypeScript 1.8 you have to use plugin-typescript 4.0.16 Create hello.ts file export function greeter(person: String) { ...

TypeScript • TypeScript with SystemJS

Getting started with Play 2.4.x/2.5.x - Windows, Java

Installations Download and install: Java 8 - download the relevant installation from Oracle site. Activator - download zip from www.playframework.com/download and extract files to the target Play folder, for example to: c:\Play-2.4.2\activator-dist-1.3.5 sbt - download from www.sc...

playframework • Getting started with playframework

Accessing a filtered list from outside an ng-repeat

Occasionally you will want to access the result of your filters from outside the ng-repeat, perhaps to indicate the number of items that have been filtered out. You can do this using as [variablename] syntax on the ng-repeat. <ul> <li ng-repeat="item in vm.listItems | filter:vm.myF...

AngularJS • Filters

Database First in Entity Framework Core with a Class Library and SQL Server

Okay it took me about a day to figure it out so here I am posting the steps I followed to get my Database First working in a Class Project (.NET Core), with a .NET Core Web App. Step 1 - Install .NET Core Make Sure you are using .NET Core not DNX (Hint: You should be able to see the .NET Core opti...

Entity Framework Core • Getting started with Entity Framework Core

simple daemon application

A daemon process executes a program in the background, usually without user interaction. The example below shows how to create a daemon and register a listener, which monitors all open applications. The main part is the function call NSRunLoop.mainRunLoop().run(), which starts the daemon. class MyO...

osx • NSRunLoop

Serialization using Json.NET with JsonSerializerSettings

This serializer has some nice features that the default .net json serializer doesn't have, like Null value handling, you just need to create the JsonSerializerSettings : public static string Serialize(T obj) { string result = JsonConvert.SerializeObject(obj, new JsonSerializerSettings { NullVa...

.NET Framework • JSON Serialization