C# WebSocket Fleck 调用非托管C++ DLL 实现通信（使用char*接收）

 [DllImport(@"C:XXX.dll", CallingConvention = CallingConvention.StdCall)]
        unsafe public static extern int XXX(char* strin, char* strout);
        static void Main()
        {
            FleckLog.Level = LogLevel.Debug;
            var allSockets = new List<IWebSocketConnection>();
            var server = new WebSocketServer("ws://0.0.0.0:8181");
            server.Start(socket =>
            {
                socket.OnOpen = () =>
                {
                    Console.WriteLine("Open!");
                    allSockets.Add(socket);
                };
                socket.OnClose = () =>
                {
                    Console.WriteLine("Close!");
                    allSockets.Remove(socket);
                };
                socket.OnMessage = message =>
                {
                    Console.WriteLine(message);
                    message = getDate(message);
                    socket.Send(message);
                };
            });

            var input = Console.ReadLine();
            while (input != "exit")
            {
                input = Console.ReadLine();
            }

        }

    unsafe private static string getData(string message)
        {

            char* ptrIn = (char*)Marshal.StringToHGlobalAnsi(message).ToPointer();
            string result = string.Empty;
            fixed (char* ptrOut = result)
            {
                //该区域中ptrOut始终指向托管字符串test
                var aa = XXX(ptrIn, ptrOut);
                result = Marshal.PtrToStringAnsi((IntPtr)ptrOut);
            }
Convert.ToString(Marshal.PtrToStringAnsi((IntPtr)q));
            if (result.Substring(, ) != "")
            {
                result = "获取失败";
            }
            return result;

        }