Paul,

Great example, since that's covered in the documentation. Just search
for "EnumWindows" and you should find it. Basicly you use a delegate
for the callback parameter.

Mattias

Hi, inline

class SomeClass
{

   [DllImport..]
   private extern static EnumWindows(WndEnumHandler, IntPtr lparam);

   private delegate bool WndEnumHandler(IntPtr hParentWnd, IntPtr lparam);

   private WndEnumHandler wndEnumHandler;    // delegate-instance

   public SomeClass()
   {
       // you must store a reference to the delegate instance, otherwise
       // the GC may clean it up.
       wndEnumHandler = new WndEnumHandler( OnWndEnum );
   }

   public void StartEnumWindows(int tag)
   {
       EnumWindows( wndEnumHandler, new IntPtr(tag) );
   }

   private bool OnWndEnum( IntPtr hParentWnd, IntPtr lparam )
   {
       // int tag = lparam.ToInt32();
       // use hParentWnd

       return true;   // or false to stop enumerating
    }
}

HTH,
greetings