Winform跨进程通信

妖狐艹你老母 2023-10-04 11:22 10阅读 0赞

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Runtime.InteropServices;
    using System.Text;
    using System.Threading.Tasks;
    
    namespace 大屏Win
    {
        public class WinMessageHelper
        {
            private struct COPYDATASTRUCT
            {
                public IntPtr dwData;
                public int cbData;
                [MarshalAs(UnmanagedType.LPStr)]
                public string lpData;
            }
            //使用COPYDATA进行跨进程通信
            public const int WM_COPYDATA = 0x004A;
            [DllImport("User32.dll", EntryPoint = "SendMessage")]
            private static extern int SendMessage(
            int hWnd, // handle to destination window
            int Msg, // message
            int wParam, // first message parameter
            ref COPYDATASTRUCT lParam // second message parameter
            );
            [DllImport("User32.dll", EntryPoint = "FindWindow")]
            private static extern int FindWindow(string lpClassName, string lpWindowName);
            /// <summary>
            /// 发送消息
            /// </summary>
            /// <param name="windowReceiveTitle">接收方窗体标题名称</param>
            /// <param name="strData">要发送的数据</param>
            public static void Send(string windowReceiveTitle, string strData)
            {
                int winHandler = FindWindow(null, windowReceiveTitle);
                if (winHandler != 0)
                {
                    byte[] sarr = System.Text.Encoding.Default.GetBytes(strData);
                    int len = sarr.Length + 1;
                    COPYDATASTRUCT cds;
                    cds.dwData = (IntPtr)100;
                    cds.lpData = strData;
                    cds.cbData = len;
                    SendMessage(winHandler, WM_COPYDATA, 0, ref cds);
                }
            }
            /// <summary>
            /// 接收消息
            /// </summary>
            /// <example>
            /// 在窗体中覆盖接收消息函数
            /// protected override void DefWndProc(ref System.Windows.Forms.Message m)
            /// {
            ///   switch(m.Msg)
            ///   {
            ///     case WinMessageHelper.WM_COPYDATA:
            ///       string str = WinMessageHelper.Receive(ref m);
            ///       break;
            ///     default:
            ///       base.DefWndProc(ref m);
            ///       break;
            /// 
            ///   }
            /// }
            /// </example>
            /// <returns>接收的到数据</returns>
            public static string Receive(ref System.Windows.Forms.Message m)
            {
                COPYDATASTRUCT cds = new COPYDATASTRUCT();
                Type cdsType = cds.GetType();
                cds = (COPYDATASTRUCT)m.GetLParam(cdsType);
                return cds.lpData;
            }
        }
    }