Tutorial by Examples: ce

#include <stdio.h> #include <curl/curl.h> int main(void) { CURL *curl; CURLcode res; curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_URL, "http://example.com"); /* example.com is redirected, so we tell libcurl to follow redirect...

C++17 Thanks to int std::uncaught_exceptions(), we can implement action which executes only on success (no thrown exception in scope). Previously bool std::uncaught_exception() just allows to detect if any stack unwinding is running. #include <exception> #include <iostream> templa...

1. Jenkins : Jenkins is an open source continuous integration tool written in Java. The project was forked from Hudson after a dispute with Oracle. In a nutshell, Jenkins is the leading open source automation server. Built with Java, it provides hundreds of plugins to support building, testing, de...

A UserForm is a class module with a designer and a default instance. The designer can be accessed by pressing Shift+F7 while viewing the code-behind, and the code-behind can be accessed by pressing F7 while viewing the designer. Work with a new instance every time. Being a class module, a form i...

One useful feature of extension methods is that you can create common methods for an interface. Normally an interface cannot have shared implementations, but with extension methods they can. public interface IVehicle { int MilesDriven { get; set; } } public static class Extensions { ...

When writing wrappers for unmanaged resources, you should subclass SafeHandle rather than trying to implement IDisposable and a finalizer yourself. Your SafeHandle subclass should be as small and simple as possible to minimize the chance of a handle leak. This likely means that your SafeHandle imple...

using System.IO.Ports; namespace TextEchoService { class Program { static void Main(string[] args) { var serialPort = new SerialPort("COM1", 9600, Parity.Even, 8, StopBits.One); serialPort.Open(); string message = &quot...

using System; using System.Collections.Generic; using System.IO.Ports; using System.Text; using System.Threading; namespace AsyncReceiver { class Program { const byte STX = 0x02; const byte ETX = 0x03; const byte ACK = 0x06; const byte NAK = 0x15...

You can extract fasta sequence from a blastdb constructed from a fasta file using blastdbcmd which should be installed when you install makeblastdb. blastdbcmd -entry all -db <database label> -out <outfile> If you had a database called my_database which contained the files my_databas...

Some email clients (notably Windows Desktop Outlook) collapse tables with no content, even if there are dimensions or padding. To prevent these clients from collapsing the spacer table, you can add an invisible   that serves as content. Then zero out the character's font-size and line-heig...

As already pointed out in other pitfalls, catching all exceptions by using try { // Some code } catch (Exception) { // Some error handling } Comes with a lot of different problems. But one perticular problem is that it can lead to deadlocks as it breaks the interrupt system when writ...

The latest version of the Oracle Java style guide mandates that the "then" and "else" statements in an if statement should always be enclosed in "braces" or "curly brackets". Similar rules apply to the bodies of various loop statements. if (a) { //...

The | can be used to have a single case statement match against multiple inputs to yield the same result: def f(str: String): String = str match { case "foo" | "bar" => "Matched!" case _ => "No match." } f("foo") // res0: String = M...

It's a good practice to run NodeJS apps controlled by process managers. Process manager helps to keep application alive forever, restart on failure, reload without downtime and simplifies administrating. Most powerful of them (like PM2) have a built-in load balancer. PM2 also enables you to manage ...

If you want to log exceptions you can and should make use of the logging.exception(msg) method: >>> import logging >>> logging.basicConfig() >>> try: ... raise Exception('foo') ... except: ... logging.exception('bar') ... ERROR:root:bar Traceback (most rec...

The following query returns the documents which have an element named "company" - cts:element-value-query( xs:QName('company'), '*', ("wildcarded"))) The following query returns the documents which have an element named "company" with an attribute named "name&...

To Illustrate the MERGE Statement, consider the following two tables - dbo.Product : This table contains information about the product that company is currently selling dbo.ProductNew: This table contains information about the product that the company will sell in the future. The foll...

Use EXCEPT to prevent updates to unchanged records MERGE TargetTable targ USING SourceTable AS src ON src.id = targ.id WHEN MATCHED AND EXISTS ( SELECT src.field EXCEPT SELECT targ.field ) THEN UPDATE SET field = src.field WHEN...

If you want to parse more complex command-line arguments, e.g. with optional parameters, than the best is to use google's GWT approach. All classes are public available at: https://gwt.googlesource.com/gwt/+/2.8.0-beta1/dev/core/src/com/google/gwt/util/tools/ToolBase.java An example for handling ...

Worse ViewController: // ... myMethod: function () { this.getView().lookup('myhappyfield').setValue(100); } //... View: //... items: [ { xtype: 'textfield', reference: 'myhappyfield' } ] //... Better ViewController: // ... myMethod: function () { ...