窗口之间传递消息的一个方法

发送窗口的代码

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 WpfSendMsg
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        const int WM_COPYDATA = 0x004A;
        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        private static extern int SendMessage(
            int hWnd, // handle to destination BR>            
            int Msg, // message
            int wParam, // first message parameter
            ref COPYDATASTRUCT lParam // second message parameter
        );

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

        public Window1()
        {
            InitializeComponent();
            this.Title = "SentWindow";
        }

        private void btn1_Click(object sender, RoutedEventArgs e)
        {
            //int HANDLER = Findnull, @"欲发送程序窗口的标题");
            int HANDLER = Find(null, @"WindowGet");
            if (HANDLER != 0)
            {
                byte[] sarr = System.Text.Encoding.Default.GetBytes(tb1.Text);
                int len = sarr.Length;
                COPYDATASTRUCT cds;
                cds.dwData = (IntPtr)100;
                cds.lpData = tb1.Text;
                cds.cbData = len + 1;
                SendMessage(HANDLER, WM_COPYDATA, 0, ref cds);
            }
        }
    }

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

发送窗口的代码