Tutorial by Examples: ar

Varnish VCL

Varnish controls and manipulates HTTP requests using Varnish Configuration Language (VCL). The following snippet of VCL removes cookie from incoming requests to /images subdirectory: sub vcl_recv { if (req.url ~ "^/images") { unset req.http.cookie; } }

varnish • Getting started with varnish

Creating a Resource Dictionary

Having lots of styles in App.xaml will quickly become complex, so they can be placed in separate resource dictionaries. In order to use the dictionary, it must be merged with App.xaml. So, in App.xaml, after the resource dictionary has been created: <Application xmlns="http://s...

wpf • An Introduction to WPF Styles

Passing arguments

You can also pass arguments with a message to work with. We will use the classed from our previous example and extend them. In the receiving part, right behind the Subscribe method call add the type of the argument you are expecting. Also make sure you also declare the arguments in the handler sign...

Xamarin.Forms • MessagingCenter

The Artery Simulation Framework

Artery (https://github.com/riebl/artery) is a simulation framework for OMNeT++. It is designed to simulate the ETSI ITS-G5 protocol stack which is used in European VANETs. Currently, it is using OMNeT++ in version 5.0. It is completely open source and under active development. Feature Overview: ...

omnet++ • Simulation of VANETs using OMNeT++ and Artery

Adding my own ITS-G5 Service: Where should I start?

To start with creating your own service, take a look at the base class of each service, which is called ItsG5Service. Also you can look at the CamService and the DenmService as they are already implemented services. All application related files and classes can be found in the artery/application sub...

omnet++ • Simulation of VANETs using OMNeT++ and Artery

Variable inheritance

parent.html.twig <!DOCTYPE html> <html> <head> <title>{{ title_variable | default('Normal Page') }}</title> </head> <body> <h1>This is the {{ title_variable }} Page</h1> </body> </html> ...

twig • Template inheritance

Searched CASE statement

In a Searched Case statement, each option can test one or more values independently. The code below is an example of a searched case statement: DECLARE @FirstName varchar(30) = 'John' DECLARE @LastName varchar(30) = 'Smith' SELECT CASE WHEN LEFT(@FirstName, 1) IN ('a','e','i','o','u') ...

Microsoft SQL Server • CASE Statement

How to start the server?

Step 1: To start the server just type the command bellow then you'll see the start page. $ bundle exec hanami server

Ruby Language • Getting started with Hanami

Enabling MultiDex in your Xamarin.Android APK

MultiDex is a library in the Android APK that allows the app to have more than 65,536 methods. The Android APKs have Dalvik Executable files (.dex) that contain the generated bytecodes compiled from your Java code. Each .dex file can contain up to 65,536 methods (2^16). Android OS versions before ...

Xamarin.Android • Publishing your Xamarin.Android APK

Snapshot with subview with other markup and text

Support Portrait and Landscape both type of image Drawing and other subviews can be merged in my case I'm adding label to draw { CGSize fullSize = getImageForEdit.size; CGSize sizeInView = AVMakeRectWithAspectRatioInsideRect(imgViewFake.image.size, imgViewFake.bounds).size; CGFl...

iOS • Snapshot of UIView

Getting Started

Here is an example of a test using Pax Exam. package com.example.project.test; import static org.junit.Assert.*; import static org.ops4j.pax.exam.CoreOptions.*; import javax.inject.Inject; import org.junit.Test; import org.junit.runner.RunWith; import org.ops4j.pax.exam.Configuration;...

osgi • Using Pax Exam for integration testing OSGi applications

Raspberry Pi v2 and v3 Arch Linux Installation --- from Mac or Linux

One of the best Linux distributions currently for Raspberry Pi (from now on, "RPi") is Arch Linux. This web shows the installation for: RPi2. ARMv7 architecture (32 bits). RPi3. There are two options: ARMv7 architecture (32 bits) or AArch architecture (64 bits). This t...

Raspberry Pi • Getting started with Raspberry Pi

Enabling ProGuard in your Xamarin.Android APK

ProGuard is a tool used in the building process to optimize and obfuscate the Java code of your APK, and also remove unused classes. The resulting APK when using ProGuard will have a smaller size and will be harder to reverse-engineer (decompilation). ProGuard can be used too in Xamarin.Android app...

Xamarin.Android • Publishing your Xamarin.Android APK

"Mysterious" bugs related to ProGuard and Linker

You made a great app and tested it in Debug, with good results. Everything was working fine! But then, you decided to prepare your app for release. You set up MultiDex, ProGuard and Linker, and then, it stopped working. This tutorial aims to help you to find out common problems related to ProGuard...

Xamarin.Android • Publishing your Xamarin.Android APK

BQL Parse and Verify

Any Acumatica application developer spends a great deal of their time writing BQL code. At the same time, not everybody knows the underlying details of how BQL types work under the hood. At the heart of BQL lay two key methods: Parse() and Verify(), declared by the IBqlCreator interface. Most of th...

acumatica • Acumatica BQL Reference

Bitmap - Parsing Binary Data

Attoparsec makes parsing binary data trivial. Assuming these definitions: import Data.Attoparsec.ByteString (Parser, eitherResult, parse, take) import Data.Binary.Get (getWord32le, runGet) import Data.ByteString (ByteString, readFile) import ...

Haskell Language • Attoparsec

Escaping characters in R regex patterns

Since both R and regex share the escape character ,"\", building correct patterns for grep, sub, gsub or any other function that accepts a pattern argument will often need pairing of backslashes. If you build a three item character vector in which one items has a linefeed, another a tab ch...

R Language • Regular Expressions (regex)

Example to get length of a character varying field

Example 1, Query: SELECT char_length('ABCDE') Result: 5 Example 2, Query: SELECT character_length('ABCDE') Result: 5

postgresql • Find String Length / Character Length

Html.Partial Vs Html.RenderPartial

Html.Partial returns a string on the other hand Html.RenderPartial returns void. Html.RenderPartial This method returns void and the result is directly written to the HTTP response stream. That means it uses the same TextWriter object used in the current webpage/template. For this reason, this me...

asp.net-mvc • Partial Views

Echo application - HAL library

In this example the microcontroller echos back the received bytes to the sender using UART RX interrupt. #include "stm32f4xx.h" UART_HandleTypeDef huart2; /* Single byte to store input */ uint8_t byte; void SystemClock_Config(void); /* UART2 Interrupt Service Routine */ void...

stm32 • UART - Universal Asynchronous Receiver/Transmitter (serial communication)