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Acessing WinAPI from C#

// August 16th, 2009 // Programming

The Windows API, informally WinAPI, is Microsoft’s core set of application programming interfaces (APIs) available in the Microsoft Windows operating systems. It was formerly called the Win32 API; however, the name Windows API more accurately reflects its roots in 16-bit Windows and its support on 64-bit Windows.

When declaring APIs in C#, use the following syntax:

using System.Runtime.InteropServices;

...

[DllImport( dll_filename )]
[public|private] static extern ret_type function( [type para, ...] );

Here sample to play sound that I get from www.csharpfriends.com

using System;
using System.Runtime.InteropServices;

namespace APITest
{
    class clsAPI
    {
        [DllImport("winmm.dll")]
        public static extern long PlaySound(string lpszName, long hModule, long dwFlags);

        [STAThread]
        static void Main(string[] args)
        {
            long retval;
            string fname = "e:\\sounds\\hit.wav";
            retval = PlaySound( fname, 0, 1 );
        }
    }
}

Now, how we can know what’s function inside dll?? check pinfoke.

by : Willy Achmat Fauzi