c# 捕捉 c++发送的消息

实例：

//c++ f发送命令的ID

        const int WM_USER = 0x0400;
        const int WM_VIDEOWND_NOTIFY = WM_USER + 0x501;

//在c#中复写WndProc方法就可以了
        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_VIDEOWND_NOTIFY)
            {
                Debugger.Break();
            }
            else
            {
                base.WndProc(ref m);
            }
        }