c#进程间通信（Inter-Process Communication）

c#进程间通信（IPC, Inter-Process Communication）

接收端：

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  MarshalAs


namespace receive
{
    public partial class Receive : Form
    {
public Receive()
        {
            InitializeComponent();
        }
        protected override void DefWndProc(ref System.Windows.Forms.Message m)          //重构此函数接收数据
        {
            switch (m.Msg)
            {
                case Message.WM_TEST:  //确定类型后，处理数据
                     string  message = string.Format("收到消息！参数为：{0},{1},{2}", m.Msg, m.WParam, m.LParam);
                    label1.Text = message;
                    break;
                default:
                    base.DefWndProc(ref m);
                    break;
            }
        }
    }
    class Message
    {
        public const int USER = 0X0400;
        public const int WM_TEST = USER + 101;
        public const int WM_MSG = USER + 102;
    }

}

发送端：

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
        [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

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int hWnd = FindWindow(null, @"Receive"); 
            SendMessage(hWnd, Message.WM_TEST, 99, 100);//参数1、窗口句柄。2 、消息类型。 3、数据1。 4、数据2
        }
    }
    class Message
    {
        public const int USER = 0X0400;
        public const int WM_TEST = USER + 101;      //简单的数据传输类型，传两个整数。
        public const int WM_MSG = USER + 102;
    }
}

比较复杂的字符串传输：

发送端：

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;
    }
}

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