private string filepath;

        private int iHandle;



        public Driver(string path)

        {

            this.filepath = path;

        }



        public bool Close()

        {

            return CloseHandle(this.iHandle);

        }



        [DllImport("kernel32.dll")]

        private static extern bool CloseHandle(int hObject);

        [DllImport("kernel32.dll")]

        private static extern int CreateFile(string lpFilename, uint dwDesiredAccess, int dwShareMode, int lpSecurityAttributes, int dwCreationDisposition, int dwFlagsAndAttributes, int hTemplateFile);

        public bool Open()

        {

            this.iHandle = CreateFile(this.filepath, 3, 0, 0, 3, 0, 0);

            return (this.iHandle != -1);

        }



        public bool Write(string Mystring)

        {

            int num;

            OVERLAPPED overlapped;

            if (this.iHandle == -1)

            {

                throw new Exception("端口未打开！");

            }

            byte[] bytes = Encoding.Default.GetBytes(Mystring);

            return WriteFile(this.iHandle, bytes, bytes.Length, out num, out overlapped);

        }



        public bool Write(byte[] barray)

        {

            int num;

            OVERLAPPED overlapped;

            if (this.iHandle == -1)

            {

                throw new Exception("端口未打开！");

            }

            return WriteFile(this.iHandle, barray, barray.Length, out num, out overlapped);

        }



        [DllImport("kernel32.dll")]

        private static extern bool WriteFile(int hFile, byte[] lBuffer, int nNumberOfBytesToWrite, out int lpNumbersOfBytesWritten, out OVERLAPPED lpOverlapped);



        [StructLayout(LayoutKind.Sequential)]

        private struct OVERLAPPED

        {

            private int Internal;

            private int InternalHigh;

            private int Offset;

            private int OffSetHigh;

            private int hEvent;

        }

    }