Tutorial by Examples: ai

Pseudocode for async/await keywords

Consider a simple asynchronous method: async Task Foo() { Bar(); await Baz(); Qux(); } Simplifying, we can say that this code actually means the following: Task Foo() { Bar(); Task t = Baz(); var context = SynchronizationContext.Current; t.ContinueWith(task...

C# Language • Synchronization Context in Async-Await

AirPrint printing Banner Text

Objective-C Add the delegate and a text-formatter to the ViewController.h file @interface ViewController : UIViewController <UIPrintInteractionControllerDelegate> { UISimpleTextPrintFormatter *_textFormatter; } In the ViewController.m file define the following constants #define Def...

iOS • AirPrint tutorial in iOS

SELECT data into file.

You can COPY table and paste it into a file. postgres=# select * from my_table; c1 | c2 | c3 ----+----+---- 1 | 1 | 1 2 | 2 | 2 3 | 3 | 3 4 | 4 | 4 5 | 5 | (5 rows) postgres=# copy my_table to '/home/postgres/my_table.txt' using delimiters '|' with null as 'null_s...

postgresql • INSERT

Create custom field type from available field types

Let's get some theoretical knowledge before moving to the example. There are three important terms being used here Analyzers, Tokenizers, and Filters. To create such custom field you will need to create an analyzer with one tokenizer and one or more filters. As mentioned here, you can have only one ...

solr • How to create a custom fieldType

Include custom elements schema in your module

import { NgModule, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core'; import { CommonModule } from '@angular/common'; import { AboutComponent } from './about.component'; @NgModule({ imports: [ CommonModule ], declarations: [ AboutComponent ], exports: [ AboutComponent ], schemas...

Angular 2 • Use native webcomponents in Angular 2

Placing a bound on a trait

When defining a new trait it is possible to enforce that types wishing to implement this trait verify a number of constraints or bounds. Taking an example from the standard library, the DerefMut trait requires that a type first implement its sibling Deref trait: pub trait DerefMut: Deref { fn...

Rust • Traits

Displaying Google Analytics data in your Website

This document explains how to get Google Access tokens and use them to get Google Analytics data to be displayed in our websites. Example: A live example is available in https://newtonjoshua.com note: Use the same gmail account for all the below steps. STEP 1: Set Up Google Analytics Foll...

google-analytics • Displaying Google Analytics data in your Website

MailMessage

Here is the example of creating of mail message with attachments. After creating we send this message with the help of SmtpClient class. Default 25 port is used here. public class clsMail { private static bool SendMail(string mailfrom, List<string>replytos, List<string> mailtos, L...

.NET Framework • System.Net.Mail

Mail with Attachment

MailMessage represents mail message which can be sent further using SmtpClient class. Several attachments (files) can be added to mail message. using System.Net.Mail; using(MailMessage myMail = new MailMessage()) { Attachment attachment = new Attachment(path); myMail.Attachments.Add...

.NET Framework • System.Net.Mail

Key-Value Pairing

You can use a TStringList to store Key-Value pairs. This can be useful if you want to store settings, for example. A settings consists of a Key (The Identifier of the setting) and the value. Each Key-Value pair is stored in one line of the StringList in Key=Value format. procedure Demo(const FileN...

Embarcadero Delphi • TStringList class

Generate Public / Private Key Pairs

To generate key pairs using different algorithms and key sizes: final KeyPairGenerator dhGenerator = KeyPairGenerator.getInstance("DiffieHellman"); final KeyPairGenerator dsaGenerator = KeyPairGenerator.getInstance("DSA"); final KeyPairGenerator rsaGenerator = KeyPairGenerator...

Java Language • Security & Cryptography

4. Chaining string manipulation methods together.

Dim exStr : exStr = " <Head>data</Head> " Dim res res = Ucase(Replace(Mid(exStr, instr(exStr, ">")+1,4), "ata", "ark")) 'res now equals DARK 'instr(exStr, ">") returns 7 'Mid(" <Head>data</Head> ", 7+1,...

vbscript • Strings

What is TFS and how Data is stored in it?

Team Foundation Server (commonly abbreviated to TFS) is a Microsoft product that provides source code management (either via Team Foundation Version Control or Git), reporting, requirements management, project management (for both agile software development and waterfall teams), automated builds and...

Team Foundation Server • Getting started with Team Foundation Server

GitHub pull requests fail

Out of the box installations of Jenkins with the Git and SSH plugins will not work when attempting to pull a private repository from GitHub.

jenkins • Install Jenkins on Windows with SSH support for private GitHub repositories

Chains

Since ConstraintLayout alpha 9, Chains are available. A Chain is a set of views inside a ConstraintLayout that are connected in a bi-directional way between them, i.e A connected to B with a constraint, and B connected to A with another constraint. Example: <android.support.constraint.Constrain...

Android • ConstraintLayout

regr_slope(Y, X) : slope of the least-squares-fit linear equation determined by the (X, Y) pairs

To illustrate how to use regr_slope(Y,X), I applied it to a real world problem. In Java, if you don't clean up memory properly, the garbage can get stuck and fill up the memory. You dump statistics every hour about memory utilization of different classes and load it into a postgres database for anal...

postgresql • Aggregate Functions

Obtaining a url for an Item

Given a simple sitecore item: Item item; The item itself does not contain it's url. To obtain a url for an item you need to make a call to the static class Sitecore.Links.LinkManager string url = LinkManager.GetItemUrl(item); an overload of this accepts a UrlOptions class: UrlOptions option...

sitecore • LinkManager

chai-immutable plugin

Install from npm chai, chai-immutable, and ts-node npm install --save-dev chai chai-immutable ts-node Install types for mocha and chai npm install --save-dev @types/mocha @types/chai Write simple test file: import {List, Set} from 'immutable'; import * as chai from 'cha...

TypeScript • Unit Testing

Connect Amazon redshift database and fetch data into Array using Node.js

Best way to connect amazon redshift using JDBC , Use proper driver as per version http://docs.aws.amazon.com/redshift/latest/mgmt/configure-jdbc-connection.html Step-1: npm install jdbc Step-2: var JDBC = require('jdbc'); var jinst = require('jdbc/lib/jinst'); // isJvmCreated will be true afte...

amazon-redshift • Getting started with amazon-redshift

YoutubePlayerFragment in portrait Activty

The following code implements a simple YoutubePlayerFragment. The activity's layout is locked in portrait mode and when orientation changes or the user clicks full screen at the YoutubePlayer it turns to lansscape with the YoutubePlayer filling the screen. The YoutubePlayerFragment does not need to...

Android • Youtube-API