WPF通过消息机制实现进程间通信(IPC)

接收端代码：

[StructLayout(LayoutKind.Sequential)]

        public struct CopyDataStruc

        {

            public IntPtr dwData;

            public int cbData;  // 字符串长度

            [MarshalAs(UnmanagedType.LPStr)]

            public string lpData; // 字符串

        }



        private void Window_Loaded(object sender, RoutedEventArgs e)

        {

            (PresentationSource.FromVisual(this) as HwndSource).AddHook(new HwndSourceHook(this.WndProc));

        }



        IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)

        {

            if (msg == MessageHelper.WM_DOWNLOAD_COMPLETED)

            {

                //CopyDataStruct cds = (CopyDataStruct)System.Runtime.InteropServices.Marshal.PtrToStructure(lParam, typeof(CopyDataStruct));

                MessageBox.Show("I got it!");

            }



            return hwnd;

        }

发送端代码：

private void PostMessage()

        {

            Process proc = Process.GetProcessesByName("MyAppSample")[0];

            //Process[] procs = Process.GetProcesses();

            //foreach (Process p in procs)

            //{

            //    if (p.ProcessName == "MyAppSample")

            //    {

            //        proc = p;

            //    }

            //}

            IntPtr hwnd = MessageHelper.FindWindow(null, "MainWindow");

            MessageHelper.PostMessage(hwnd, MessageHelper.WM_DOWNLOAD_COMPLETED, IntPtr.Zero, IntPtr.Zero);

            MessageHelper.PostMessage(proc.MainWindowHandle, MessageHelper.WM_DOWNLOAD_COMPLETED, IntPtr.Zero, IntPtr.Zero);

        }

public class MessageHelper

    {

        public const int WM_DOWNLOAD_COMPLETED = 0x00AA;



        [DllImport("User32.dll", EntryPoint = "FindWindow")]

        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);



        [DllImport("User32.dll", EntryPoint = "SendMessage")]

        public static extern int SendMessage(IntPtr wnd, int msg, IntPtr wP, IntPtr lP);

        //private static extern int SendMessage

        //(

        //    IntPtr hWnd,    //目标窗体句柄

        //    int Msg,        //WM_COPYDATA

        //    int wParam,     //自定义数值

        //    ref  CopyDataStruct lParam //结构体

        //);



        [DllImport("User32.dll", EntryPoint = "PostMessage")]

        public static extern int PostMessage(IntPtr wnd, int msg, IntPtr wP, IntPtr lP);