WPF向系统发送消息 并传递结构体

场景 ：需要开发一个通讯组件 流程为：界面-开启接收服务-通过发送组件发送信息到 其他客户端和服务端

接受服务接收其他客户端发送的消息 需要传递给对应组件或者界面 因此会出现类库重复引用问题。因为采用消息队列，和数据库中转来传递消息需要每个组件知道太多其他组件的业务，并且耗损性能和时间更多一下因此都被排除掉。最后采用Windows API传递消息

后续如果有更好地办法再继续更新上来

由于项目进程间和线程间需要进行通讯，因此通过api调用windows底层消息传递
   [DllImport("User32.dll", EntryPoint = "PostMessage")]
        public static extern int PostMessage(IntPtr wnd, int msg, IntPtr wP, IntPtr lP); 

但是由于程序开发是WPF因此与传统的WinForm调用 PostMessage 消息有一定区别，并且无法传递结构体

因此通过实验和调查实现了WPF调用PostMessage传递消息，并且支持传递结构体（转换概念：现将结构体进行转换为16进制，WinProc接收后在进行转换为结构体） 具体代码如下：

 /// <summary>
        /// Receive message window form handle 消息接收窗口句柄
        /// </summary>
        public static IntPtr Handle;

   /// <summary>
        /// PostMessage Dll Import API方法
        /// </summary>
        [DllImport("User32.dll", EntryPoint = "PostMessage")]
        public static extern int PostMessage(IntPtr wnd, int msg, IntPtr wP, IntPtr lP);


/// <summary>
        /// Message Data Struct  结构体
        /// </summary>
        public struct MessageDataStruct
        {
//message对象
            public CMessageData messageData;
        } 


/// <summary>
        /// user-defined message no 自定义消息
        /// </summary>
        public const int USER_MESSAGE = 0x0400;


发送消息

 /// <summary>
        /// Send mesage data to window message queue
        /// </summary>
        /// <param name="messageData">message data</param>
        public void PostMessageToMessageQueue(MessageDataStruct messageData)
        {
            //结构体赋值
            MessageDataStruct mds = new MessageDataStruct();
            mds.messageData = new CMessageData();
            LocalClientInfo lci = new LocalClientInfo();
            lci.ClientID = "我是客户端id";
            lci.ClientIP = "我是客户端ip";
            mds.messageData.LocalClientInfo = new LocalClientInfo();
            mds.messageData.LocalClientInfo = lci;

            //结构体转换为 IntPtr 16进制
            IntPtr buffer = Marshal.AllocCoTaskMem(Marshal.SizeOf(mds));
            Marshal.StructureToPtr(mds, buffer, false);

            //发送消息
            PostMessage(Handle, BaseTypeParameters.USER_MESSAGE（等同于消息编号）, buffer, IntPtr.Zero);
        } 





Windows消息接收

 调用系统WinProc方法

 void win_SourceInitialized(object sender, EventArgs e)
        {

            HwndSource hwndSource = PresentationSource.FromVisual(this) as HwndSource;
            if (hwndSource != null)
            {
                hwndSource.AddHook(new HwndSourceHook(WindowProc));
            }
        }

        protected override void OnSourceInitialized(EventArgs e)
        {
            base.OnSourceInitialized(e);
            this.win_SourceInitialized(this, e);
        }

        #region USB识别操
        private IntPtr WindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            IntPtr result = IntPtr.Zero;
            {
                //WM_DEVICECHANGE，系统硬件改变发出的系统消息   

                int param = msg;
                switch (param)
                {
//判断是否为自定义消息
                    case BaseTypeParameters.USER_MESSAGE:
//将消息转换为结构体 

                        MessageDataStruct mds = (MessageDataStruct)Marshal.PtrToStructure(wParam, typeof(MessageDataStruct));
                        MessageBox.Show(mds.messageData.LocalClientInfo.ClientID + "----" + mds.messageData.LocalClientInfo.ClientIP);
                        break;
                }
                return result;
            }
        }
        #endregion 


//将窗句柄赋值给服务
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            ReceiveDataImplement.Handle = new WindowInteropHelper(this).Handle;
        }