C#进程间通信

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使用SendMessage向另一进程发送WM_COPYDATA消息

Send端：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;using System.Runtime.InteropServices;namespace SentTest{    /// <summary>    /// MainWindow.xaml 的交互逻辑    /// </summary>    public partial class MainWindow : Window    {        public MainWindow()        {            InitializeComponent();            this.Title = "发送窗口";        }        const int WM_COPYDATA = 0x004A;        public struct COPYDATASTRUCT        {            public IntPtr dwData;            public int cData;            [MarshalAs(UnmanagedType.LPStr)]            public string lpData;        }        [DllImport("User32.dll")]        public static extern int SendMessage(int hwnd, int msg, int wParam, ref COPYDATASTRUCT IParam);        [DllImport("User32.dll")]        public static extern int FindWindow(string lpClassName, string lpWindowName);        private void button1_Click(object sender, RoutedEventArgs e)        {            String strSent = "需要发送的信息";            int WINDOW_HANDLE = FindWindow(null, "接收窗口");            if (WINDOW_HANDLE != 0)            {                byte[] arr = System.Text.Encoding.Default.GetBytes(strSent);                int len = arr.Length;                COPYDATASTRUCT cdata;                cdata.dwData = (IntPtr)100;                cdata.lpData = strSent;                cdata.cData = len + 1;                SendMessage(WINDOW_HANDLE, WM_COPYDATA, 0, ref cdata);            }        }    }}

Get端：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;using System.Runtime.InteropServices;using System.Windows.Interop;namespace GetTest{    /// <summary>    /// MainWindow.xaml 的交互逻辑    /// </summary>    public partial class MainWindow : Window    {        IntPtr hwnd;        public MainWindow()        {            InitializeComponent();            this.Title = "接受窗口";            this.Loaded += new RoutedEventHandler(MainWindow_Loaded);            this.Closed += new EventHandler(MainWindow_Closed);        }        void MainWindow_Loaded(object sender, RoutedEventArgs e)        {            //窗口加载完毕才可用，否则会报错。            hwnd = new WindowInteropHelper(this).Handle;            HwndSource source = HwndSource.FromHwnd(hwnd);            if (source != null) source.AddHook(WndProc);        }        void MainWindow_Closed(object sender, EventArgs e)        {            try            {                HwndSource.FromHwnd(hwnd).RemoveHook(WndProc);            }            catch (Exception)            {                throw;            }        }        const int WM_COPYDATA = 0x004A;//WM_COPYDATA消息的主要目的是允许在进程间传递只读数据。        //Windows在通过WM_COPYDATA消息传递期间，不提供继承同步方式。        //其中,WM_COPYDATA对应的十六进制数为0x004A        public struct COPYDATASTRUCT        {            public IntPtr dwData;            public int cData;            [MarshalAs(UnmanagedType.LPStr)]            public string lpData;        }        //wpf用此方法        private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)        {            if (msg == WM_COPYDATA)            {                COPYDATASTRUCT cdata = new COPYDATASTRUCT();                Type mytype = cdata.GetType();                cdata = (COPYDATASTRUCT)Marshal.PtrToStructure(lParam, mytype);                this.textBox1.Text = cdata.lpData;            }            return IntPtr.Zero;        }        //WinFrom用此方法        /* protected override void DefWndProc(ref Message m)        {            switch (m.Msg)            {            case WM_COPYDATA:                COPYDATASTRUCT cdata = new COPYDATASTRUCT();                Type mytype = cdata.GetType();                cdata = (COPYDATASTRUCT)m.GetLParam(mytype);                this.textBox1.Text = cdata.lpData;                break;            default:                base.DefWndProc(ref m);                break;            }        } */    }}

参考文章：

http://blog.csdn.net/feiren127/article/details/5459827

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