BOOL CSerialCom::OpenPort(CString portname)
{
portname= "//./" + portname;  hComm = CreateFile(portname,  GENERIC_READ | GENERIC_WRITE,  0,  0,  OPEN_EXISTING,  0,  0);
if(hComm==INVALID_HANDLE_VALUE){  return false;}  else return true;  }  

BOOL CSerialCom::ConfigurePort(DWORD BaudRate, BYTE ByteSize,   DWORD fParity, BYTE Parity, BYTE StopBits)
{  if((m_bPortReady = GetCommState(hComm, &m_dcb))==0)  {  MessageBox("GetCommState Error","Error",MB_OK+MB_ICONERROR);  CloseHandle(hComm);  return false;  }  m_dcb.BaudRate =BaudRate;  m_dcb.ByteSize = ByteSize;  m_dcb.Parity =Parity ;  m_dcb.StopBits =StopBits;  m_dcb.fBinary=TRUE;  m_dcb.fDsrSensitivity=false;  m_dcb.fParity=fParity;  m_dcb.fOutX=false;  m_dcb.fInX=false;  m_dcb.fNull=false;  m_dcb.fAbortOnError=TRUE;  m_dcb.fOutxCtsFlow=FALSE;  m_dcb.fOutxDsrFlow=false;  m_dcb.fDtrControl=DTR_CONTROL_DISABLE;  m_dcb.fDsrSensitivity=false;  m_dcb.fRtsControl=RTS_CONTROL_DISABLE;  m_dcb.fOutxCtsFlow=false;  m_dcb.fOutxCtsFlow=false;  m_bPortReady = SetCommState(hComm, &m_dcb);  if(m_bPortReady ==0)  {  MessageBox("SetCommState Error","Error",MB_OK+MB_ICONERROR);  CloseHandle(hComm);  return false;  }  return true;
}  

BOOL CSerialCom::SetCommunicationTimeouts(DWORD ReadIntervalTimeout,   DWORD ReadTotalTimeoutMultiplier,   DWORD ReadTotalTimeoutConstant,   DWORD WriteTotalTimeoutMultiplier,   DWORD WriteTotalTimeoutConstant)
{  if((m_bPortReady = GetCommTimeouts (hComm, &m_CommTimeouts))==0)  return false;  m_CommTimeouts.ReadIntervalTimeout =ReadIntervalTimeout;  m_CommTimeouts.ReadTotalTimeoutConstant =ReadTotalTimeoutConstant;  m_CommTimeouts.ReadTotalTimeoutMultiplier =ReadTotalTimeoutMultiplier;  m_CommTimeouts.WriteTotalTimeoutConstant = WriteTotalTimeoutConstant;  m_CommTimeouts.WriteTotalTimeoutMultiplier =WriteTotalTimeoutMultiplier;  m_bPortReady = SetCommTimeouts (hComm, &m_CommTimeouts);  if(m_bPortReady ==0)  {  MessageBox("StCommTimeouts function failed",  "Com Port Error",MB_OK+MB_ICONERROR);  CloseHandle(hComm);  return false;  }  return true;
}

BOOL CSerialCom::WriteByte(BYTE bybyte)
{  iBytesWritten=0;  if(WriteFile(hComm,&bybyte,1,&iBytesWritten,NULL)==0)  return false;  else   return true;
} 

BOOL CSerialCom::ReadByte(BYTE &resp)
{  BYTE rx;  resp=0;  DWORD dwBytesTransferred=0;  if (ReadFile (hComm, &rx, 1, &dwBytesTransferred, 0))  {  if (dwBytesTransferred == 1)  {  resp=rx;  return true;  }  }  return false;
} 

View Code

void CSerialCom::ClosePort()
{
CloseHandle(hComm);
return;
}  

1. 1.  1 // 打开串口。 需要检查函数返回值来判断串口是否正确打开
       2 port.OpenPort( );
       3
       4 // 配置串口。需要检查函数返回值来判断否正确配置
       5 port.ConfigurePort( );
       6
       7 // 设置超时时间。需要检查函数返回值来判断否正确配置
       8 port.SetCommunicationTimeouts( );
       9
      10 // 写串口，由于一次只能写一个字节，一般需要多次调用此函数才能将需要发送的字符串发送完
      11 port.WriteByte();
      12
      13 // 读串口，由于一次只能读一个字节，一般需要多次调用此函数才能将需要读取的字符串读完
      14 port.ReadByte( );
      15
      16 // 关闭串口
      17 port.ClosePort();

      下载地址: http://pan.baidu.com/s/1mgzH428

2. (一个由印度人编写的VC++串口类_serialport+CSerialCom_demo)

3. 参考:    http://cs.nju.edu.cn/yangxc/dcc2003.files/jszc-sub/comif-35.htm
4. http://www.codeguru.com/cpp/i-n/network/serialcommunications/article.php/c2483/A-communication-class-for-serial-port.htm
5. http://www.vc-rs232.com/html/VC_SSCOM_Control/2011/0117/34.html