Tutorial by Examples: check

To get a list of available serial ports use python -m serial.tools.list_ports at a command prompt or from serial.tools import list_ports list_ports.comports() # Outputs list of available serial ports from the Python shell.

For null check in method Object nullableObject = methodReturnObject(); if (Objects.isNull(nullableObject)) { return; } For not null check in method Object nullableObject = methodReturnObject(); if (Objects.nonNull(nullableObject)) { return; }

To prevent memory leaks, one should not forget to close an input stream or an output stream whose job is done. This is usually done with a try-catch-finally statement without the catch part: void writeNullBytesToAFile(int count, String filename) throws IOException { FileOutputStream out = null...

Sometimes, the latest tagged version of a package is buggy or is missing some required features. Advanced users may wish to update to the latest development version of a package (sometimes referred to as the "master", named after the usual name for a development branch in Git). The benefit...

[root@localhost ~]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d87bf9607836 8251da35e7a7 "/bin/bash" About a minute ago Up 31 seconds vol3 [r...

[root@localhost ~]# docker inspect d87bf9607836 "Mounts": [ { "Name": "cdf78fbf79a7c9363948e133abe4c572734cd788c95d36edea0448094ec9121c", "Source": "/var/lib/docker/volumes/cdf78fbf79a7c9363948e133abe4c572734cd788c95d36edea0448094ec9121c/_data&quot...

Type below command: instmodsh It'll show you the guild as below: Available commands are: l - List all installed modules m <module> - Select a module q - Quit the program cmd? Then type l to list all the installed modules, you can also use command m &l...

//Check if a value exists in settings already if (IsolatedStorageSettings.ApplicationSettings.Contains("Key")) { //perform logic }

The keywords can also create scopes in order to (un)check multiple operations. short m = 32767; short n = 32767; checked { int result1 = (short)(m + n); //will throw an OverflowException } unchecked { int result2 = (short)(m + n); // will return -2 }

In this example we will implement a custom Checkbox for Android and iOS. Creating the Custom Control namespace CheckBoxCustomRendererExample { public class Checkbox : View { public static readonly BindableProperty IsCheckedProperty = BindableProperty.Create<Checkbox, bool&gt...

/** * @author piotrek1543 * * This example provides a specific UI testing problem and how it is already solved * with Google's Espresso. Notice that I used also Spoon framework, as Espresso * lacks of taking screenshots functionality. */ @RunWith(AndroidJUnit4.class) public class M...

Checkbox is a control that allow user to get boolean values from user for a spesific question like "Are you ok?". Has a event called CheckedChanged, which occurs whenever the check property is changed. Here is a CheckBox that has a question "Is Checked?". We got this Message...

A check box displays a single option that the user can either check or uncheck and radio buttons present a group of options from which the user can select just one option. To create a group of radio buttons, you specify the same name for the GroupName attribute of each radio button in the group. If...

A radio button list presents a list of mutually exclusive options. A check box list presents a list of independent options. These controls contain a collection of ListItem objects that could be referred to through the Items property of the control. Basic syntax of radio button list: <asp:RadioB...

#!/usr/bin/env node var fs = require('fs'); var path = require('path'); var jshint = require('jshint').JSHINT; var async = require('async'); var foldersToProcess = [ 'js' ]; foldersToProcess.forEach(function(folder) { processFiles("www/" + folder); }); function proce...

This line of code demonstrate how to check if a specific field is NULL or has blank value =IIF(IsNothing(Fields!UserEmail.Value) OR Fields!UserEmail.Value = "", "Empty", "Not Empty") This line of code checks if the field is NULL IsNothing(Fields!UserEmail.Value) ...

It's quite common to want to check the status of the various partitions/drives on your server/computer to see how full they are. The following command is the one you'll want to run: df -h This will produce output similar to the following: [root@mail ~]# df -h Filesystem Size Used A...

autodie allows you to work with files without having to explicitly check for open/close failures. Since Perl 5.10.1, the autodie pragma has been available in core Perl. When used, Perl will automatically check for errors when opening and closing files. Here is an example in which all of the lines ...

On Unix-like operating systems, it is possible to use the pkg-config program to find and configure packages that provides a <package>.pc file. In order to use pkg-config, it is necessary to call include(FindPkgConfig) in a CMakeLists.txt. Then, there are 2 possible functions: pkg_search_mo...

A modern Fortran example which includes error checking and a function to get a new unit number for the file. module functions contains function get_new_fileunit() result (f) implicit none logical :: op integer :: f f = 1 do ...