SendNotifyMessage and PostMessage

[Crazy321]

Hi,

I need some help with PostMessage or SendNotifyMessage.

In the past I was using SendMessage, but because this waits untill it is processed by the target application it was not what I wanted.

Now I want to change the way I send/post it.

I've read that both PostMessage and SendNotifyMessage do not wait.

Here is a part of the code i'm using to test/get it working with SendNotifyMessage

public class TestSendMessage {
        [DllImport("user32.dll")]
        private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [return: MarshalAs(UnmanagedType.Bool)]
        [DllImport("user32.dll", SetLastError = true)]
        private static extern Boolean SendNotifyMessage(IntPtr hWnd, WndMsg Msg, IntPtr wParam, IntPtr lParam);

        public static void sendTo() {
            IntPtr objHandle = FindWindow(null, "testform")
            if (!objHandle.Equals(IntPtr.Zero)) {
                 bool blnOK = SendNotifyMessage(objHandle, WndMsg.WM_COPYDATA, IntPtr.Zero, IntPtr.Zero);
               if (!blnOK) {
                    int intErrorCode = Marshal.GetLastWin32Error();
                } 
            }
	}
}

And in the main of my app i do:

            while (true) {
		TestSendMessage.sendTo(); 
                System.Threading.Thread.Sleep(2000);
            }

The error i get in "GetLastWin32Error is 1159, so ERROR_MESSAGE_SYNC_ONLY.

Am I using it wrong? and what can I do to fix it?


Thanks