同一机器上两个进程间通信(c#)

【实例截图】

【核心代码】

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;

namespace SendDemo1st
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public struct CopyDataStruct
        {
            public IntPtr dwData;
            public int cbData;

            [MarshalAs(UnmanagedType.LPStr)]

            public string lpData;
        }

        public const int WM_COPYDATA = 0x004A;

        //通过窗口标题来查找窗口句柄   
        [DllImport("User32.dll", EntryPoint = "FindWindow")]
        private static extern int FindWindow(string lpClassName, string lpWindowName);

        //在DLL库中的发送消息函数  
        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        private static extern int SendMessage
            (
            int hWnd,                         // 目标窗口的句柄    
            int Msg,                          // 在这里是WM_COPYDATA  
            int wParam,                       // 第一个消息参数  
            ref  CopyDataStruct lParam        // 第二个消息参数  
           );  

        private void button1_Click(object sender, EventArgs e)
        {
            string strURL = textBox1.Text;
            CopyDataStruct cds;
            cds.dwData = (IntPtr)1; //这里可以传入一些自定义的数据，但只能是4字节整数        
            cds.lpData = strURL;    //消息字符串  
            cds.cbData = System.Text.Encoding.Default.GetBytes(strURL).Length   1;  //注意，这里的长度是按字节来算的  
            SendMessage(FindWindow(null, "Form2"), WM_COPYDATA, 0, ref cds);       // 窗口标题

        }


        //接收消息方法  
        protected override void WndProc(ref System.Windows.Forms.Message e)
        {
            if (e.Msg == WM_COPYDATA)
            {
                CopyDataStruct cds = (CopyDataStruct)e.GetLParam(typeof(CopyDataStruct));
                textBox2.Text = cds.lpData.ToString();             
            }
            base.WndProc(ref e);
        }  
    }
}