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Message: [QUOTE="SeeSharp Bint, post: 10324568"] Hi I'm using some of the definitions I found pinvoke.net for PostMessage and PeekMessage as follows [return: MarshalAs(UnmanagedType.Bool)] [DllImport("user32.dll", SetLastError = true)] public static extern bool PostMessage( HandleRef hWnd,// handle to destination window UInt32 Msg, // message IntPtr wParam, // first message parameter IntPtr lParam // second message parameter ); [StructLayout(LayoutKind.Sequential)] public struct Message { public IntPtr handle; public uint msg; public IntPtr wParam; public IntPtr lParam; public uint time; public System.Drawing.Point p; } [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] public static extern bool PeekMessage( out Message lpMsg, HandleRef hWnd,// handle to destination window uint wMsgFilterMin, uint wMsgFilterMax, uint wRemoveMsg ); WM_USER = 0x0400, public const int WM_EnteringGym = (int)WinServices.WindowsMessages.WM_USER + 11; I post a message as follows: PostMessage(new HandleRef(null, _MainWindowHandle), UserMessages.WM_EnteringGym, 1); I peek for the message as follows: Message msg; PeekMessage(out msg, new HandleRef(null, this.Handle), UserMessages.WM_EnteringGym, UserMessages.WM_EnteringGym, 1); When it arrives, and I check msg, WParam is 0x118 and LParam is 0x00 Where am i going wrong please? Why isnt WParam 0x01 ? [/QUOTE]