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   源码介绍

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实现了 不同winform窗体之间 发送消息，即：不同的exe应用程序之间的通信

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;  //for DllImport

namespace send
{
    public partial class Form1 : Form
    {
        [DllImport("User32.dll", EntryPoint = "SendMessage")]
       // private static extern int SendMessage(int hWnd, int msg, int wParam, int lParam);       //发送消息
        private static extern int SendMessage(int hWnd, int msg, int wParam, ref COPYDATASTRUCT lParam);   
        [DllImport("User32.dll", EntryPoint = "FindWindow")]
        private static extern int FindWindow(string lpClassName, string lpWindowName);      //获取另一个进程的窗口句柄

        const int WM_COPYDATA = 0x004A;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int hWnd = FindWindow(null, @"Receive");
            string message = "你好消息成功发送！";
            int i = message.Length;
            byte[] sarr = System.Text.Encoding.Default.GetBytes(message);
            COPYDATASTRUCT cds;
            cds.dwData = (IntPtr)100;
            cds.lpData = message;
            cds.cbData = sarr.Length 1;         //此值错误会引发接收端崩溃
            SendMessage(hWnd, WM_COPYDATA, 0, ref cds);
        }
    }
    public struct COPYDATASTRUCT
    {
        public IntPtr dwData;
        public int cbData;
        [MarshalAs(UnmanagedType.LPStr)]
        public string lpData;
    }
}