两个C#的exe程序执行相互通信

两个exe通信有多种方式：1、直接通信；2、文件或粘贴板通信；3、协议通信(socket)。以下是采用直接通信的方法代码

发射端界面：

<Window x:Class="SendMsg.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <TextBox x:Name="txtImpinj" HorizontalAlignment="Left" Height="23" Margin="61,25,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120"/>
        <Button Content="Button" HorizontalAlignment="Left" Margin="199,24,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click"/>

    </Grid>
</Window>

　发射端后台代码：

 public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        public const int WM_COPYDATA = 0x004A;

        //通过窗口的标题来查找窗口的句柄 
        [DllImport("User32.dll", EntryPoint = "FindWindow")]
        private static extern int FindWindow(string lpClassName, string lpWindowName);

        //在DLL库中的发送消息函数
        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        private static extern int SendMessage
        (
        int hWnd, // 目标窗口的句柄 
        int Msg, // 在这里是WM_COPYDATA
        int wParam, // 第一个消息参数
        ref CopyDataStruct lParam // 第二个消息参数
        );

        private void Button_Click(object sender, EventArgs e)
        {
            //将文本框中的值， 发送给接收端 
            string strURL = txtImpinj.Text;
            CopyDataStruct cds;
            cds.dwData = (IntPtr)1; //这里可以传入一些自定义的数据，但只能是4字节整数 
            cds.lpData = strURL; //消息字符串
            cds.cbData = System.Text.Encoding.Default.GetBytes(strURL).Length + 1; //注意，这里的长度是按字节来算的
            int hwnd = FindWindow(null, "接收端");
            SendMessage(hwnd, WM_COPYDATA, 0, ref cds); // 这里要修改成接收窗口的标题“接收端”
            //this.Close();
        }


    }
    //WM_COPYDATA消息所要求的数据结构
    public struct CopyDataStruct
    {
        public IntPtr dwData;
        public int cbData;

        [MarshalAs(UnmanagedType.LPStr)]

        public string lpData;
    }

接收端界面：

<Window x:Class="ReciveMsg.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="接收端" Height="350" Width="525">
    <Grid>
        <TextBox x:Name="textBox1" HorizontalAlignment="Left" Height="23" Margin="78,70,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120"/>

    </Grid>
</Window>

接收端后台代码：

    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            SourceInitialized += HandleInitialized;
        }

        private void HandleInitialized(object sender, EventArgs e)
        {
            IntPtr wptr = new WindowInteropHelper(this).Handle;
            HwndSource hs = HwndSource.FromHwnd(wptr);
            hs.AddHook(new HwndSourceHook(WindowProc));
        }
        private const int WM_COPYDATA = 0x004A;
        private IntPtr WindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            if (msg == WM_COPYDATA)
            {
                CopyDataStruct cds = (CopyDataStruct)Marshal.PtrToStructure(lParam, typeof(CopyDataStruct));
                textBox1.Text = cds.lpData.ToString(); //将文本信息显示到文本框
                return IntPtr.Zero;
            }
            return hwnd;
        }
    }
    //WM_COPYDATA消息所要求的数据结构
    public struct CopyDataStruct
    {
        public IntPtr dwData;
        public int cbData;

        [MarshalAs(UnmanagedType.LPStr)]
        public string lpData;
    }