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   源码介绍

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c#进程之间通信,c#exe 之间发消息,c#exe 相互通信 vs2005 编写的 接收 发送都有

原理：根据窗口名称找到 窗口的句柄，然后给窗口 SendMessage

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;
namespace WinFormSendMsg
{
    public partial class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.Button button1;
        private System.ComponentModel.Container components = null;
        const int WM_COPYDATA = 0x004A;
        public Form1()
        {
            InitializeComponent();
        }
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose(disposing);
        }

        private void InitializeComponent()
        {
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.button1 = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(184, 24);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(128, 21);
            this.textBox1.TabIndex = 0;
            this.textBox1.Text = "textBox1";
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(344, 16);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(112, 32);
            this.button1.TabIndex = 1;
            this.button1.Text = "button1";
            this.button1.Click  = new System.EventHandler(this.button1_Click);
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(536, 142);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.button1,
this.textBox1});
            this.Name = "Form1";
            this.Text = "发送方窗体";
            this.ResumeLayout(false);
        }
        static void Main()
        {
            Application.Run(new Form1());
        }
        [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 COPYDATASTRUCT lParam // second message parameter
        );

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

        private void button1_Click(object sender, System.EventArgs e)
        {
            int WINDOW_HANDLER = FindWindow(null, @"接收方窗体");
            if (WINDOW_HANDLER == 0)
            {
            }
            else
            {
                byte[] sarr = System.Text.Encoding.Default.GetBytes(this.textBox1.Text);
                int len = sarr.Length;
                COPYDATASTRUCT cds;
                cds.dwData = (IntPtr)100;
                cds.lpData = this.textBox1.Text;
                cds.cbData = len   1;
                SendMessage(WINDOW_HANDLER, WM_COPYDATA, 0, ref cds);

            }
        }
    }
    public struct COPYDATASTRUCT
    {
        public IntPtr dwData;
        public int cbData;
        [MarshalAs(UnmanagedType.LPStr)]
        public string lpData;
    }

}