public static int SendMessageToMainWindow(int Msg, int wParam, ref MyLParam lParam)
{
if (MainWindowPtr == IntPtr.Zero)
{
HwndSource hwndSource = PresentationSource.FromVisual(Application.Current.MainWindow) as HwndSource;
MainWindowPtr = hwndSource.Handle;
}
return(SendMessage(MainWindowPtr, Msg, wParam, ref lParam));
}
public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, ref MyLParam lParam);