串口接收最高位为0的问题

Question

我使用vs2005，使用一个串口类来接收数据，但是使用我的程序来接收最高为一直都为0，使用调试助手再运行我的程序，可以正确接收数据，请问高手这是哪里出了问题，是不是哪个参数没有设置正确？？？或其它什么问题，我想硬件是没有问题的，因为用调试助手能够正确收数。解决问题马上给分。

Answer 1

用的是什么数据类型？Byte？　Int？

Answer 2

我用的是网上的一个串口类
  public void Open()
        {            DCB dcbCommPort = new DCB();
            COMMTIMEOUTS ctoCommPort = new COMMTIMEOUTS();
            // OPEN THE COMM PORT.
            hComm = CreateFile("COM" + PortNum, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);            // IF THE PORT CANNOT BE OPENED, BAIL OUT.
            if (hComm == INVALID_HANDLE_VALUE)
            {
                throw (new ApplicationException("Comm Port Can Not Be Opened"));
            }            // SET THE COMM TIMEOUTS.            GetCommTimeouts(hComm, ref ctoCommPort);
            ctoCommPort.ReadTotalTimeoutConstant = ReadTimeout;
            ctoCommPort.ReadTotalTimeoutMultiplier = 100;
            ctoCommPort.WriteTotalTimeoutMultiplier =100;
            ctoCommPort.WriteTotalTimeoutConstant = 100;
            ctoCommPort.ReadIntervalTimeout = 100;
            SetCommTimeouts(hComm, ref ctoCommPort);            
            // SET BAUD RATE, PARITY, WORD SIZE, AND STOP BITS.
            // THERE ARE OTHER WAYS OF DOING SETTING THESE BUT THIS IS THE EASIEST.
            // IF YOU WANT TO LATER ADD CODE FOR OTHER BAUD RATES, REMEMBER
            // THAT THE ARGUMENT FOR BuildCommDCB MUST BE A POINTER TO A STRING.
            // ALSO NOTE THAT BuildCommDCB() DEFAULTS TO NO HANDSHAKING.            dcbCommPort.DCBlength = Marshal.SizeOf(dcbCommPort);
            GetCommState(hComm, ref dcbCommPort);
            dcbCommPort.BaudRate = BaudRate;
            dcbCommPort.Parity = Parity;
            dcbCommPort.ByteSize = ByteSize;
            dcbCommPort.StopBits = StopBits;
            dcbCommPort.fParity = 0;
            dcbCommPort.fBinary = 1;
            dcbCommPort.fDtrControl = 0;
            dcbCommPort.fRtsControl = 0;
            dcbCommPort.fOutX = dcbCommPort.fInX = dcbCommPort.fTXContinueOnXoff = 0;
            SetCommState(hComm, ref dcbCommPort);
            PurgeComm(hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);
            Opened = true;
            Thread th = new Thread( new ThreadStart( Execut ));
            th.Start();        }        private void Execut()
        {
                  while ( Done )
                 {
                        byte [] Buffer = this.Read( 128);
                        if ( Buffer.Length > 0 )
                         {
                                   OnReadEvent( Buffer );
                         }
                 }
        }        private void OnReadEvent( byte [] Buffer )
        {
                 if ( ReadEvent != null )
                {
                          ReadEvent( this , Buffer );
                 }
        }        public void Close()
        {
            Done = false;
            if (hComm != INVALID_HANDLE_VALUE)
            {
                CloseHandle(hComm);
                Opened = false;
            }
        }        public byte[] Read(int NumBytes)
        {
            byte[] BufBytes;
            byte[] OutBytes;
            BufBytes = new byte[NumBytes];
            if (hComm != INVALID_HANDLE_VALUE)
            {
                OVERLAPPED ovlCommPort = new OVERLAPPED();
                ovlCommPort.Offset = 0;
                ovlCommPort.OffsetHigh = 0;
                int BytesRead = 0;
                ReadFile(hComm, BufBytes, NumBytes, ref BytesRead, ref ovlCommPort);
                OutBytes = new byte[BytesRead];
                Array.Copy(BufBytes, OutBytes, BytesRead);
            }
            else
            {
                throw (new ApplicationException("Comm Port Not Open"));
            }
            return OutBytes;
        }        public int Write(byte[] WriteBytes)
        {
            int BytesWritten = 0;
            if (hComm != INVALID_HANDLE_VALUE)
            {
                OVERLAPPED ovlCommPort = new OVERLAPPED();
                ovlCommPort.Offset = 0;
                ovlCommPort.OffsetHigh = 0;                WriteFile(hComm, WriteBytes, WriteBytes.Length, ref BytesWritten, ref ovlCommPort);
            }
            else
            {
                throw (new ApplicationException("Comm Port Not Open"));
            }
            return BytesWritten;
        }        public  string ByteToString(byte[] InBytes)
        {
            string StringOut = "";
            foreach (byte InByte in InBytes)
            {
                StringOut = StringOut + String.Format("{0:X2} ", InByte);
            }
            return StringOut;
        }
        public static byte[] StringToByte(string InString)
        {
            string[] ByteStrings;
            ByteStrings = InString.Split(" ".ToCharArray());
            byte[] ByteOut;
            ByteOut = new byte[ByteStrings.Length - 1];
            for (int i = 0; i == ByteStrings.Length - 1; i++)
            {
                //ByteOut[i] = ("0x" + ByteStrings[i]).ToByte();
                ByteOut[i] = Byte.Parse(("0x" + ByteStrings[i]));
            }
            return ByteOut;
        }

Answer 3

有数据过来产生一个事件进行数据读取
       private void OnReadEvent( byte [] Buffer )
        {
                 if ( ReadEvent != null )
                {
                          ReadEvent( this , Buffer );
                 }
        }