RaUI/Source/ryControls/Sheng.Winform.Controls/Win32/WinMessage.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;

namespace Sheng.Winform.Controls.Win32
{
    /// <summary>
    /// 
    /// </summary>
    public static class WinMessage
    {
        /// <summary>
        /// 发送消息，只能传递一个自定义的消息ID和消息字符串，想传一个结构，但没成功
        /// </summary>
        /// <param name="destProcessName">目标进程名称，如果有多个，则给每个都发送</param>
        /// <param name="msgID">自定义数据，可以通过这个来决定如何解析下面的strMsg</param>
        /// <param name="strMsg">传递的消息，是一个字符串</param>
        public static void SendMessage(string destProcessName, int msgID, string strMsg)
        {
            if (strMsg == null)
                return;

            //按进程名称查找，同名称的进程可能有许多，所以返回的是一个数组
            Process[] foundProcess = Process.GetProcessesByName(destProcessName);
            foreach (Process p in foundProcess)
            {
                int toWindowHandler = p.MainWindowHandle.ToInt32();
                if (toWindowHandler != 0)
                {
                    User32.CopyDataStruct cds;
                    cds.dwData = (IntPtr)msgID;   //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 = strMsg;            //消息字符串
                    cds.cbData = System.Text.Encoding.Default.GetBytes(strMsg).Length + 1;  //注意，这里的长度是按字节来算的

                    //发送方的窗口的句柄, 由于本系统中的接收方不关心是该消息是从哪个窗口发出的，所以就直接填0了
                    int fromWindowHandler = 0;
                    User32.SendMessage(toWindowHandler, User32.WM_COPYDATA, fromWindowHandler, ref  cds);
                }
            }
        }

        /// <summary>
        /// 接收消息，得到消息字符串
        /// </summary>
        /// <param name="m">System.Windows.Forms.Message m</param>
        /// <returns>接收到的消息字符串</returns>
        public static string ReceiveMessage(ref  System.Windows.Forms.Message m)
        {
            if (m.Msg == User32.WM_COPYDATA)
            {
                User32.CopyDataStruct cds = (User32.CopyDataStruct)m.GetLParam(typeof(User32.CopyDataStruct));
                return cds.lpData;
            }
            else
            {
                return String.Empty;
            }
        }
    }
}