C# Signature:

[DllImport("user32.dll")]
static extern bool EnumDesktops(IntPtr hwinsta, EnumDesktopsDelegate
   lpEnumFunc, IntPtr lParam);

VB.NET Signature

<Runtime.InteropServices.DllImport("user32.dll")>
Private Function EnumDesktops(ByVal hwinsta As IntPtr, ByVal lpEnumFunc As EnumDesktopsDelegate, ByVal lParam As IntPtr) As Boolean
End Function

User-Defined Types:

EnumDesktopsDelegate

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

    private delegate bool EnumDesktopsDelegate(string desktop, IntPtr lParam);

    [DllImport("user32.dll")]
    static extern bool EnumDesktops(IntPtr hwinsta, EnumDesktopsDelegate
                        lpEnumFunc, IntPtr lParam);

    private static bool _enumDesktopCallback( string desktop, IntPtr lParam )
    {
        GCHandle gch       = GCHandle.FromIntPtr( lParam );
        IList<string> list = gch.Target as List<string>;

        if ( null == list ) {
        return (false);
        }

        list.Add( desktop );

        return (true);
    }

    int _doEnumDesktops()
    {
        IList<string> list       = new List<string>();
        GCHandle gch         = GCHandle.Alloc( list );
        EnumDesktopsDelegate childProc = _enumDesktopCallback;

        if (!EnumDesktops(IntPtr.Zero, childProc, GCHandle.ToIntPtr( gch ) ))
        {
        int e = Marshal.GetLastWin32Error();
        WriteLine( "EnumDesktops errno={0}",  e );
        WriteLine( "EnumWindowStations errno={0}",  e );
        return 1;
        }

        foreach ( string a in list ) {
        Console.WriteLine( a );
        }

        return 0;
    }  

Alternative Managed API:

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