#include <irrKlang.h>

// ...

// start up the engine
irrklang::ISoundEngine* engine = irrklang::createIrrKlangDevice();

// ...

// after finished,
// close the engine again, similar as calling 'delete'
engine->drop();

The createIrrKlangDevice() function also accepts several parameters, so that you can specify which sound driver should be used, if plugins should be used, if irrKlang should run in multithreaded mode, and similar.

Playing Sounds
Once you have irrKlang running (like in Starting up the Engine), you can start playing sounds:

engine->play2D("someSoundFile.wav");

This works with all supported file types. You can replace "someSoundFile.wav" with "someSoundFile.mp3", or "someSoundFile.ogg", for example.
To play a sound looped, set the second parameter to 'true':

engine->play2D("myMusic.mp3", true);

To stop this looping sound again, use engine->stopAllSounds() to stop all sounds, or irrklang::ISound::stop() if you only want to stop that single sound. Influencing Sounds during Playback shows how to get to that ISound interface.

Сишарп
How to use irrKlang.NET
Take a look in the /examples.net folder of the SDK, there you'll find some examples for C# and VisualBasic.NET which are using irrKlang.NET. Copy irrKlang.DLL and all plugin .DLLs (ikp*.DLL) into the folder where your application is. The following simple example shows how to use irrKlang to play back a music file:

[C#]
using System;
using IrrKlang;

namespace HelloWorld
{
class Example
{
[STAThread]
static void Main(string[] args)
{
// start up the engine
ISoundEngine engine = new ISoundEngine();

// play a sound file
engine.play2D("../../media/ophelia.mp3");

// wait until user presses ok to end application

System.Windows.Forms.MessageBox.Show("Playing, press ok.");

} // end main()

} // end class

} // end namespace