Window 串口收发 基于VC6.0解决思路

Window 串口收发 基于VC6.0
现在要做一个简单的串口收发程序，把从COM2读入的数据再从COM3发出去，COM3读入的数据从COM2发输出，就是把电脑当做一个RS485转RS232转换器，COM3是485接口COM2是232接口，程序怎么写，只需要提供一些函数原型和头文件即可！！！求大神！

------解决方案--------------------
建议拿c#做。。。有serial控件。。。当时做了一个上午就做出来了。。。字符串处理部分费了点儿时间。。。其他很简单。。。
------解决方案--------------------
这貌似没有什么难的吧，打开文件读写就可以了
void CSerialPort::Open(int nPort, DWORD dwBaud, Parity parity, BYTE DataBits, StopBits stopbits, FlowControl fc, BOOL bOverlapped)
{
//Validate our parameters
ASSERT(nPort>0 && nPort<=255);

//Call CreateFile to open up the comms port
CString sPort;
sPort.Format(_T("\\\\.\\COM%d"), nPort);
m_hComm = CreateFile(sPort, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, bOverlapped ? FILE_FLAG_OVERLAPPED : 0, NULL);
if (m_hComm == INVALID_HANDLE_VALUE)
{
TRACE(_T("Failed to open up the comms port\n"));
AfxThrowSerialException();
}
  
m_bOverlapped = bOverlapped;

//Get the current state prior to changing it
DCB dcb;
GetState(dcb);

//Setup the baud rate
dcb.BaudRate = dwBaud; 

//Setup the Parity
switch (parity)
{
case EvenParity: dcb.Parity = EVENPARITY; break;
case MarkParity: dcb.Parity = MARKPARITY; break;
case NoParity: dcb.Parity = NOPARITY; break;
case OddParity: dcb.Parity = ODDPARITY; break;
case SpaceParity: dcb.Parity = SPACEPARITY; break;
default: ASSERT(FALSE); break;
}

//Setup the data bits
dcb.ByteSize = DataBits;

//Setup the stop bits
switch (stopbits)
{
case OneStopBit: dcb.StopBits = ONESTOPBIT; break;
case OnePointFiveStopBits: dcb.StopBits = ONE5STOPBITS; break;
case TwoStopBits: dcb.StopBits = TWOSTOPBITS; break;
default: ASSERT(FALSE); break;
}

//Setup the flow control 
dcb.fDsrSensitivity = FALSE;
switch (fc)
{
case NoFlowControl:
{
dcb.fOutxCtsFlow = FALSE;
dcb.fOutxDsrFlow = FALSE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
break;
}
case CtsRtsFlowControl:
{
dcb.fOutxCtsFlow = TRUE;
dcb.fOutxDsrFlow = FALSE;
dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
break;
}
case CtsDtrFlowControl:
{
dcb.fOutxCtsFlow = TRUE;
dcb.fOutxDsrFlow = FALSE;
dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
break;
}
case DsrRtsFlowControl:
{
dcb.fOutxCtsFlow = FALSE;
dcb.fOutxDsrFlow = TRUE;
dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
break;
}
case DsrDtrFlowControl:
{
dcb.fOutxCtsFlow = FALSE;
dcb.fOutxDsrFlow = TRUE;
dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
break;
}
case XonXoffFlowControl:
{
dcb.fOutxCtsFlow = FALSE;
dcb.fOutxDsrFlow = FALSE;
dcb.fOutX = TRUE;
dcb.fInX = TRUE;
dcb.XonChar = 0x11;
dcb.XoffChar = 0x13;
dcb.XoffLim = 100;
dcb.XonLim = 100;
break;
}
default:
{
ASSERT(FALSE);
break;
}
}
  
//Now that we have all the settings in place, make the changes
SetState(dcb);
}
------解决方案--------------------
最简单可以用CMSComm