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   源码介绍

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两个不同的 winform应用程序之间通信 示例源码

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 Sender
{
    public partial class frmSender : Form
    {
        public struct COPYDATASTRUCT
        {
            public IntPtr dwData;
            public int cbData;
            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData;
        }
        //Win32 API函数  
        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        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);
        private IntPtr ip = IntPtr.Zero;
        const int WM_COPYDATA = 0x004A;
  
        public frmSender()
        {
            InitializeComponent();
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            int hWnd = FindWindow(null, @"消息接收者");//Receiver
            if (hWnd == 0)
            {
                MessageBox.Show("555，未找到消息接受者！");
            }
            else
            {
                byte[] sarr = System.Text.Encoding.Default.GetBytes(txtString.Text);
                int len = sarr.Length;
                COPYDATASTRUCT cds;
                int n;
                if (int.TryParse(txtInt.Text.Trim(), out n))
                {
                    //为数字
                    if (txtInt.Text.Trim() == "" | txtInt.Text.Trim() == null)
                    { cds.dwData = (IntPtr)100; }
                    else
                        cds.dwData = (IntPtr)Convert.ToInt16(txtInt.Text);//可以是任意值
                }
                else
                {
                    //非数字
                    cds.dwData = (IntPtr)999;
                }
                  
                //cds.dwData = (IntPtr)100;
                cds.cbData = len   1;//指定lpData内存区域的字节数  
                cds.lpData = txtString.Text;//发送给目标窗口所在进程的数据  
                SendMessage(hWnd, WM_COPYDATA, 0, ref cds);
            }  

        }

    }
}