Tutorial by Examples: en

This is a client-server example. The process forks and runs client in the parent process and server in the child process: client connects to server and waits until server exits; server accepts connection from client, enables keepalive, and waits any signal. Keepalive is configured using the f...

When write() is called for a named or unnamed pipe or stream socket whose reading end is closed, two things happen: POSIX.1-2001 SIGPIPE signal is sent to the process that called write() POSIX.1-2004 SIGPIPE signal is sent to the thread that called write() EPIPE error is returned ...

function onButtonClick() { navigator.bluetooth.requestDevice({filters: [{services: ['heart_rate']}]}) .then(device => { // Connecting to GATT Server... return device.gatt.connect(); }) .then(server => { // Getting Heart Rate Service... return server.getP...

The "child" components of a component are available on a special prop, props.children. This prop is very useful for "Compositing" components together, and can make JSX markup more intuitive or reflective of the intended final structure of the DOM: var SomeComponent = function ...

If a scoped enum is converted to an integral type that is too small to hold its value, the resulting value is unspecified. Example: enum class E { X = 1, Y = 1000, }; // assume 1000 does not fit into a char char c1 = static_cast<char>(E::X); // c1 is 1 char c2 = static_cast<c...

In IDE Jaspersoft Studio (JSS) or the older version iReport Designer it is sufficient to press Preview. The JasperReports design file .jrxml will automatically be compiled to .jasper in same folder as .jrxml if no errors are present. Another way is to press "Compile Report" button in JSS...

Multidimensional Arrays As the name indicates, multi dimensional arrays are arrays that contain more than one dimension, usually two or three but it can have up to 32 dimensions. A multi array works like a matrix with various levels, take in example a comparison between one, two, and three Dimensi...

Using git show we can view a single commit git show 48c83b3 git show 48c83b3690dfc7b0e622fd220f8f37c26a77c934 Example commit 48c83b3690dfc7b0e622fd220f8f37c26a77c934 Author: Matt Clark <[email protected]> Date: Wed May 4 18:26:40 2016 -0400 The commit message will be show...

When creating a UIView subclass, intrinsic content size helps to avoid setting hardcoded height and width constraints a basic glimpse into how a class can utilize this class ImageView: UIView { var image: UIImage { didSet { invalidateIntrinsicContentSize() } ...

c++11 The alignment requirement of a type can be queried using the alignof keyword as a unary operator. The result is a constant expression of type std::size_t, i.e., it can be evaluated at compile time. #include <iostream> int main() { std::cout << "The alignment requiremen...

Search for :h UserGettingBored *UserGettingBored* UserGettingBored When the user presses the same key 42 times. Just kidding! :-)

This method allows a command to be sent to Cmd.exe, and returns the standard output (including standard error) as a string: private static string SendCommand(string command) { var cmdOut = string.Empty; var startInfo = new ProcessStartInfo("cmd", command) { ...

C++14 C++14 allows to use auto in lambda argument auto print = [](const auto& arg) { std::cout << arg << std::endl; }; print(42); print("hello world"); That lambda is mostly equivalent to struct lambda { template <typename T> auto operator ()(const...

Following are the page life cycle events: PreInit - PreInit is the first event in page life cycle. It checks the IsPostBack property and determines whether the page is a postback. It sets the themes and master pages, creates dynamic controls, and gets and sets profile property values. This event ca...

[footag foo="value of 1" attribute-2="value of 2"] In wordpress admin we use pre defined shortcodes by writing the shortcode name inside square brackets and optionally adding attributes to it separating by space.

Like Getting a result from another Activity you need to call the Fragment's method startActivityForResult(Intent intent, int requestCode). note that you should not call getActivity().startActivityForResult() as this will take the result back to the Fragment's parent Activity. Receiving the result c...

Here a simple portable way to get the current device family: /// <summary> /// All the device families /// </summary> public enum DeviceFamily { Desktop, Mobile, Iot, Xbox, } /// <summary> /// The helper to get the current device family /// </summ...

enum SomeEnum { A, B } let enumValues:Array<string>= []; for(let value in SomeEnum) { if(typeof SomeEnum[value] === 'number') { enumValues.push(value); } } enumValues.forEach(v=> console.log(v)) //A //B

The tabular environment is the most basic way to create a table in LaTeX and doesn't require any other packages. \begin{tabular}{|lcr||} left aligned column & center column & right column \\ \hline text & text & text \\ text & text & text \\ \end{tabular} T...

The following C code uses the OpenMP parallel programming model to write the thread ID and number of threads to stdout using multiple threads. #include <omp.h> #include <stdio.h> int main () { #pragma omp parallel { // ID of the thread in the current team ...