控制台程序使用SendMessage进行进程间的通信

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消息发送者代码
本实例中创建窗体类ProxyForm，负责发送和接收数据。
Main方法代码

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleSender{    class Program    {        static void Main(string[] args)        {            ProxyForm proxy = new ProxyForm();            Console.WriteLine("Sender：美女，晚上出去玩玩吧！");            proxy.SendMessage("Sender：美女，晚上出去玩玩吧！");            Console.WriteLine("按下任意键退出程序!");            Console.ReadKey();        }    }}

窗体类ProxyForm代码

using System;using System.Diagnostics;using System.Runtime.InteropServices;using System.Windows.Forms;namespace ConsoleSender{    public partial class ProxyForm : Form    {        private const int WM_COPYDATA = 0x004A;        private IntPtr hWndDest = IntPtr.Zero;// handle to destination window        [DllImport("User32.dll", EntryPoint = "SendMessage")]        public static extern int SendMessage(        IntPtr hWnd,              // handle to destination window        int Msg,                  // message        int wParam,               // first message parameter        ref CopyDataStruct lParam // second message parameter        );        public ProxyForm()        {            InitializeComponent();        }        protected override void DefWndProc(ref System.Windows.Forms.Message m)        {            switch (m.Msg)            {                case WM_COPYDATA:                    CopyDataStruct cds = new CopyDataStruct();                    cds = (CopyDataStruct)m.GetLParam(cds.GetType());                    Console.WriteLine("Reciver:" + cds.lpData.ToString());                    base.DefWndProc(ref m);                    break;                default:                    base.DefWndProc(ref m);                    break;            }        }        public int SendMessage(string msg)        {            try            {                Process[] procs = Process.GetProcesses();                foreach (Process p in procs)                {                    if (p.ProcessName.Equals("ConsoleReciver"))                    {                        hWndDest = p.MainWindowHandle;                    }                }                CopyDataStruct cds;                cds.dwData = (IntPtr)100;                cds.lpData = msg;                cds.cbData = (msg.Length + 1) * 2;                return SendMessage(hWndDest, WM_COPYDATA, (int)this.Handle, ref cds);                           }            catch (Exception ex)            {                throw ex;            }        }    }    /// <summary>    /// 使用COPYDATASTRUCT来传递数据    /// </summary>    [StructLayout(LayoutKind.Sequential)]    public struct CopyDataStruct    {        public IntPtr dwData;        public int cbData;        [MarshalAs(UnmanagedType.LPWStr)]        public string lpData;    }}

消息接收者代码

using System;using System.Runtime.InteropServices;using System.Windows.Forms;namespace ConsoleReciver{    public partial class Form1 : Form    {        private const int WM_COPYDATA = 0x004A;        private IntPtr hWndDest = IntPtr.Zero;// handle to destination window        [DllImport("User32.dll", EntryPoint = "SendMessage")]        public static extern int SendMessage(        IntPtr hWnd,              // handle to destination window        int Msg,                  // message        int wParam,               // first message parameter        ref CopyDataStruct lParam // second message parameter        );        public Form1()        {            InitializeComponent();        }        protected override void DefWndProc(ref System.Windows.Forms.Message m)        {            switch (m.Msg)            {                case WM_COPYDATA:                    CopyDataStruct recivedCds = new CopyDataStruct();                    recivedCds = (CopyDataStruct)m.GetLParam(recivedCds.GetType());                    hWndDest = m.WParam;                    CopyDataStruct sendCds = new CopyDataStruct();                    sendCds.dwData = (IntPtr)100;                    sendCds.lpData = "你发给我的信息我已经收到，内容是：" + recivedCds.lpData.ToString();                    sendCds.cbData = (sendCds.lpData.Length + 1) * 2;                    SendMessage(hWndDest, WM_COPYDATA, (int)this.Handle, ref sendCds);                    base.DefWndProc(ref m);                    break;                default:                    base.DefWndProc(ref m);                    break;            }        }        /// <summary>        /// 使用COPYDATASTRUCT来传递数据        /// </summary>        [StructLayout(LayoutKind.Sequential)]        public struct CopyDataStruct        {            public IntPtr dwData;            public int cbData;            [MarshalAs(UnmanagedType.LPWStr)]            public string lpData;        }    }}

程序执行结果
这里写图片描述

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