进程间发送消息整理(简易方案)

来源：互联网发布：线切割老的编程法编辑：程序博客网时间：2024/06/12 20:42

近来因项目的需要，触及到程序进程之间的消息通讯，根据应用的简繁程序，归纳成简易方案与高级方案。本文介绍简易方案，高级方案于下一篇中整理。

以下代码包括共用结构定义，发送方，接收方三个部份的代码：

结构定义：

using System;using System.Collections.Generic;using System.Text;using System.Runtime.InteropServices;namespace Common{    //发送共享消息的结构    public struct COPYDATASTRUCT    {        public IntPtr dwData;        public int cbData;        [MarshalAs(UnmanagedType.LPStr)]        public string lpData;    }}

发送方：

using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;using System.Runtime.InteropServices;namespace ProjectA{    public partial class SenderForm : Form    {        const int WM_COPYDATA = 0x004A;        //发送消息的API        [DllImport("User32.dll", EntryPoint = "SendMessage")]        private static extern int SendMessage(        int hWnd, // handle to destination window        int Msg, // message        int wParam, // first message parameter        ref Common.COPYDATASTRUCT lParam // second message parameter        );        //通过窗体标题找出窗体的Handle        [DllImport("User32.dll", EntryPoint = "FindWindow")]        private static extern int FindWindow(string lpClassName, string  lpWindowName);        public SenderForm()        {            InitializeComponent();        }        private void btnSendMsg_Click(object sender, EventArgs e)        {            //找出接收方窗体的FormHandle            int WINDOW_HANDLER = FindWindow(null, @"接收方");            if (WINDOW_HANDLER != 0)            {                byte[] sarr = System.Text.Encoding.Default.GetBytes(this.txtMsg.Text);                int len = sarr.Length;                Common.COPYDATASTRUCT cds;                cds.dwData = (IntPtr)100;                cds.lpData = this.txtMsg.Text;                                cds.cbData = len + 1;                //发送消息                SendMessage(WINDOW_HANDLER, WM_COPYDATA, 0, ref cds);            }                    }    }}

接收方：

using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;using System.Runtime.InteropServices;namespace ProjectB{    public partial class ReceiverForm : Form    {                const int WM_COPYDATA = 0x004A;        public ReceiverForm()        {            InitializeComponent();        }        protected override void DefWndProc(ref System.Windows.Forms.Message m)        {            switch (m.Msg)            {                case WM_COPYDATA:                    Common.COPYDATASTRUCT mystr = new Common.COPYDATASTRUCT();                    Type mytype = mystr.GetType();                    mystr = (Common.COPYDATASTRUCT)m.GetLParam(mytype);                    this.txtMsg.Text = mystr.lpData;                                        break;                default:                    base.DefWndProc(ref m);                    break;            }        }    }}