c# 创建一个只接收消息的窗口

/// <summary>
    /// WM_COPYDATA消息，进程间传输信息专用结构
    /// </summary>
    public struct COPYDATASTRUCT
    {
        public UINT64 dwData;
        public int cbData;

        public IntPtr lpData;

    }
    public class NotifierNativeWindow : NativeWindow
    {
        const string WindowName = "MessageOnlyWindow";
        uint WM_COPYDATA = 0x4A;

        public NotifierNativeWindow()
        {
            CreateParams cp = new CreateParams();
            cp.Style = 0;
            cp.ExStyle = 0;
            cp.ClassStyle = 0;
            cp.Caption = WindowName;
            if (Environment.OSVersion.Platform == PlatformID.Win32NT)
                cp.Parent = (IntPtr)(-3);
            CreateHandle(cp);
        }

        protected override unsafe void  WndProc(ref Message m)
        {
            if (m.Msg == WM_COPYDATA)
            {
                var obj = (COPYDATASTRUCT)m.GetLParam(typeof(COPYDATASTRUCT));
            }
            base.WndProc(ref m);
        }
    }