using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Runtime.InteropServices;  //[DllImport("user32.dll")]中DllImport的命名空间

namespace UseWMCOPYDATA
{
    class Program
    {
        static void Main(string[] args)
        {
            string strDlgTitle = "RecvMessage"; 

            //接收端的窗口句柄
            IntPtr hwndRecvWindow = ImportFromDLL.FindWindow(null, strDlgTitle);
            if (hwndRecvWindow == IntPtr.Zero)
            {
                Console.WriteLine("请先启动接收消息程序");
                return;
            }

            //自己的窗口句柄
            IntPtr hwndSendWindow = ImportFromDLL.GetConsoleWindow();
            if (hwndSendWindow == IntPtr.Zero)
            {
                Console.WriteLine("获取自己的窗口句柄失败，请重试");
                return;
            }

            for (int i = 0; i < 10; i++)
            {
                string strText = DateTime.Now.ToString();
                //填充COPYDATA结构
	            ImportFromDLL.COPYDATASTRUCT copydata = new ImportFromDLL.COPYDATASTRUCT();
                copydata.cbData = Encoding.Default.GetBytes(strText).Length; //长度 注意不要用strText.Length;
                copydata.lpData = strText;                                   //内容

                ImportFromDLL.SendMessage(hwndRecvWindow, ImportFromDLL.WM_COPYDATA, hwndSendWindow, ref copydata);

                Console.WriteLine(strText);
                Thread.Sleep(1000);
            }

        }
    }

    public class ImportFromDLL
    {
        public const int WM_COPYDATA = 0x004A;

        //启用非托管代码
        [StructLayout(LayoutKind.Sequential)] 
        public struct COPYDATASTRUCT 
        {
            public int dwData;    //not used
            public int cbData;    //长度
            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData; 
        }

        [DllImport("User32.dll")]
        public static extern int SendMessage(
            IntPtr hWnd,　　　  // handle to destination window 
            int Msg,　　　      // message
            IntPtr wParam,　   // first message parameter 
            ref COPYDATASTRUCT pcd // second message parameter 
        );

        [DllImport("User32.dll", EntryPoint = "FindWindow")]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("Kernel32.dll", EntryPoint = "GetConsoleWindow")]
        public static extern IntPtr GetConsoleWindow();

    }
}

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运行结果如下?（先启动接收消息程序再运行发送消息程序）：

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?下一篇《进程通信之二 管道技术第一篇 输入输出的重定向》示范了程序输入输出的重定向，以及如何用管道来完成进程之间的通信。

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转载请标明出处，原文地址：http://blog.csdn.net/morewindows/article/details/6804157

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