Tutorial by Examples: re

The function Emitter.listenerCount(eventName) will return the number of listeners that are currently listening for the event provided as argument const EventEmitter = require("events"); class MyEmitter extends EventEmitter{} var emitter = new MyEmitter(); emitter .on("data&quot...

When a Qt event loop is used to perform operations and a non-Qt-saavy user needs to interact with that event loop, writing the slot to handle regular invocations from another thread can simplify things for other users. main.cpp: #include "OperationExecutioner.h" #include <QCoreApplic...

The StandardClaim is embedded in the custom type to allow for easy encoding, parsing and validation of standard claims. tokenString := "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIiLCJleHAiOjE1MDAwLCJpc3MiOiJ0ZXN0In0.HE7fK0xOQwFEr4WDgRWj4teRPZ6i3GLwD5YCm6Pwu_c" type MyCustomCla...

// Create a new token object, specifying signing method and the claims // you would like it to contain. token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{ "foo": "bar", "nbf": time.Date(2015, 10, 10, 12, 0, 0, 0, time.UTC).Unix(), }) // Si...

Object pollAnswered = getCurrentSession().createSQLQuery( "select * from TJ_ANSWERED_ASW where pol_id = "+pollId+" and prf_log = '"+logid+"'").uniqueResult(); with this query, you get a unique result when you know the result of the query is always going to b...

If you get a message that the browser can't connect to the server, first check to ensure the server is up. $ ps -aef | grep httpd You should see a few httpd processes if Apache is up and running.

if I forget the password then I'll get error. $ mysql -u root -p Enter password: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES) I tried to solve the issue by first knowing the status: $ systemctl status mysql.service mysql.service - MySQL Community ...

$data = $result->mysqli_fetch_array(MYSQLI_NUM);

The key of parallelism is to use multiple threads to solve a problem (duh.) but there are some differences to classical multithreaded programming in how threads are organized. First lets talk about your typical GPU, for simplicities sake I'll focus on A GPU has many processing cores, which make it...

To initiate any operation on your devices, you'll need a command queue for each device. The Queue keeps track of different calls you did to the target device and keeps them in order. Most commands can also be executed either in blocking or non-blocking mode. Creating a queue is pretty straightforwa...

Prepare helloworld.go (find below) package main import "fmt" func main(){ fmt.Println("hello world") } Run GOOS=linux GOARCH=arm go build helloworld.go Copy generated helloworld (arm executable) file to your target machine.

To read an array from the device back to the host, one calls clEnqueueReadBuffer($queue, $memobj, $blocking, $offset, $size, $target, 0, null, null); The $queue is the CommandQueue which was used to allocate the memory on the device. The $memobj contains the address to the device memory, $offset...

Reading an image is almost like reading an array. The only difference beeing that the size and offset need to be three-dimensional. clEnqueueReadImage($queue, $memobj, $blocking, $offset, $size, $stride, $slice_pitch, $target, 0, null, null); The $stride defines how many bytes a row has. Normall...

To copy a texture to the device there are two steps necessary Allocate the memory on the device Copy the image to the device _mem = clCreateImage2D($context, $mem_flags, $image_format, $width, $height, $stride, $source, &err); The $mem_flags define how the memory is allocated. It can...

Lets look at a gamma correction kernel __constant sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE | CLK_ADDRESS_CLAMP_TO_EDGE | CLK_FILTER_LINEAR; __kernel void Gamma(__read_only image2d_t input, __write_only image2d_t output, __c...

Recent versions of Delphi ships with the TStopwatch record which is for time interval measurement. Example usage: uses System.Diagnostics; var StopWatch: TStopwatch; ElapsedMillseconds: Int64; begin StopWatch := TStopwatch.StartNew; // do something that requires measurement El...

DRF offers the chance to further customize the behavior of the generic views/viewsets by allowing the creation of custom mixins. How to: To define a custom mixin we just need to create a class inheriting from object. Let's assume that we want to define two separate views for a model named MyM...

To make your APK file as small as possible, you should enable shrinking to remove unused code and resources in your release build. This page describes how to do that and how to specify what code and resources to keep or discard during the build. Code shrinking is available with ProGuard, which dete...

An inner class which is visible to any outside class can be created from this class as well. The inner class depends on the outside class and requires a reference to an instance of it. To create an instance of the inner class, the new operator only needs to be called on an instance of the outer cla...

A print job is a request of printing something in a specific print service. It consists, basically, by: the data that will be printed (see Building the Doc that will be printed) a set of attributes After picking-up the right print service instance, we can request the creation of a print job...