同一机器上两个进程间通信（c#）

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 lpC

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2017-10-19 13:20  SENDMESSAGE\
     目录           0  2017-10-19 12:36  SENDMESSAGE\SendDemo1st\
     目录           0  2017-10-19 12:36  SENDMESSAGE\SendDemo1st\SendDemo1st\
     文件        5558  2017-10-19 13:06  SENDMESSAGE\SendDemo1st\SendDemo1st\Form1.Designer.cs
     文件        2340  2017-10-19 13:08  SENDMESSAGE\SendDemo1st\SendDemo1st\Form1.cs
     文件        5817  2017-10-19 13:06  SENDMESSAGE\SendDemo1st\SendDemo1st\Form1.resx
     文件         492  2017-10-19 12:36  SENDMESSAGE\SendDemo1st\SendDemo1st\Program.cs
     目录           0  2017-10-19 12:36  SENDMESSAGE\SendDemo1st\SendDemo1st\Properties\
     文件        1372  2017-10-19 12:36  SENDMESSAGE\SendDemo1st\SendDemo1st\Properties\AssemblyInfo.cs
     文件        2874  2017-10-19 12:36  SENDMESSAGE\SendDemo1st\SendDemo1st\Properties\Resources.Designer.cs
     文件        5612  2017-10-19 12:36  SENDMESSAGE\SendDemo1st\SendDemo1st\Properties\Resources.resx
     文件        1098  2017-10-19 12:36  SENDMESSAGE\SendDemo1st\SendDemo1st\Properties\Settings.Designer.cs
     文件         249  2017-10-19 12:36  SENDMESSAGE\SendDemo1st\SendDemo1st\Properties\Settings.settings
     文件        3681  2017-10-19 12:40  SENDMESSAGE\SendDemo1st\SendDemo1st\SendDemo1st.csproj
     目录           0  2017-10-19 12:36  SENDMESSAGE\SendDemo1st\SendDemo1st\bin\
     目录           0  2017-10-19 12:40  SENDMESSAGE\SendDemo1st\SendDemo1st\bin\Debug\
     文件       10240  2017-10-19 13:08  SENDMESSAGE\SendDemo1st\SendDemo1st\bin\Debug\SendDemo1st.exe
     文件       24064  2017-10-19 13:08  SENDMESSAGE\SendDemo1st\SendDemo1st\bin\Debug\SendDemo1st.pdb
     文件       11600  2017-10-19 13:08  SENDMESSAGE\SendDemo1st\SendDemo1st\bin\Debug\SendDemo1st.vshost.exe
     文件         490  2015-04-21 05:26  SENDMESSAGE\SendDemo1st\SendDemo1st\bin\Debug\SendDemo1st.vshost.exe.manifest
     目录           0  2017-10-19 12:36  SENDMESSAGE\SendDemo1st\SendDemo1st\obj\
     目录           0  2017-10-19 12:36  SENDMESSAGE\SendDemo1st\SendDemo1st\obj\x86\
     目录           0  2017-10-19 13:08  SENDMESSAGE\SendDemo1st\SendDemo1st\obj\x86\Debug\
     文件        2867  2017-10-19 12:36  SENDMESSAGE\SendDemo1st\SendDemo1st\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        6353  2017-10-19 13:08  SENDMESSAGE\SendDemo1st\SendDemo1st\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件         180  2017-10-19 13:07  SENDMESSAGE\SendDemo1st\SendDemo1st\obj\x86\Debug\SendDemo1st.Form1.resources
     文件         180  2017-10-19 12:40  SENDMESSAGE\SendDemo1st\SendDemo1st\obj\x86\Debug\SendDemo1st.Properties.Resources.resources
     文件         659  2017-10-19 13:08  SENDMESSAGE\SendDemo1st\SendDemo1st\obj\x86\Debug\SendDemo1st.csproj.FileListAbsolute.txt
     文件         975  2017-10-19 13:07  SENDMESSAGE\SendDemo1st\SendDemo1st\obj\x86\Debug\SendDemo1st.csproj.GenerateResource.Cache
     文件       10240  2017-10-19 13:08  SENDMESSAGE\SendDemo1st\SendDemo1st\obj\x86\Debug\SendDemo1st.exe
     文件       24064  2017-10-19 13:08  SENDMESSAGE\SendDemo1st\SendDemo1st\obj\x86\Debug\SendDemo1st.pdb
............此处省略36个文件信息