VC 操作串口

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h = ::CreateFile(DeviceArray[i].strDevPath, GENERIC_READ|GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL/*|FILE_FLAG_OVERLAPPED*/, 0);
res = (h != INVALID_HANDLE_VALUE) ? BM_DEV_COMM : BM_DEV_COMM_BUSY;

::SetupComm(h, 8192, 8192)；// 设置缓冲区大小

DCB dcb;

::GetCommState(h, &dcb)；

dcb.BaudRate =  115200;
     dcb.StopBits =  ONESTOPBIT;
     dcb.Parity =  NOPARITY;
     dcb.ByteSize =  8;
     dcb.EofChar =  0x00;
     dcb.ErrorChar =  0x00;
     dcb.EvtChar =  0x00;
     dcb.XonChar =  0x00;
     dcb.XoffChar =  0x00;
     dcb.XoffLim =  0;
     dcb.XonLim =  0;

::SetCommState(h, &dcb)；

COMMTIMEOUTS _CO;
      memset(&_CO, 0, sizeof(COMMTIMEOUTS));
      ::GetCommTimeouts(h, &_CO）；

       _CO.ReadIntervalTimeout = -1;//0;
       _CO.ReadTotalTimeoutMultiplier = -1;//1;
       _CO.ReadTotalTimeoutConstant = 10000;//1000;
       _CO.WriteTotalTimeoutMultiplier = 1;
       _CO.WriteTotalTimeoutConstant = 50;//1000;

::SetCommTimeouts(h, &_CO)；

::PurgeComm(h, PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR | PURGE_RXCLEAR );/////////清空缓冲区

::WriteFile(h, at_cmd, len, &dwBytes, NULL);

::ReadFile(h, szReturn, MAX_PATH, &dwBytes, NULL);

::CloseHandle(h);

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