serialport.cpp

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			// deal with the error code 
			if (!bResult)  
			{
				port->ProcessErrorMessage("GetOverlappedResults() in ReadFile()");
			}	
		}  // close if (!bRead)
				
		LeaveCriticalSection(&port->m_csCommunicationSync);

		// notify parent that a byte was received
		::SendMessage((port->m_pOwner)->m_hWnd, WM_COMM_RXCHAR, (WPARAM) RXBuff, (LPARAM) port->m_nPortNr);
	} // end forever loop

}

//
// Write a string to the port
//
void CSerialPort::WriteToPort(char* string)
{		
	assert(m_hComm != 0);

	memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer));
	strcpy(m_szWriteBuffer, string);

	// set event for write
	SetEvent(m_hWriteEvent);
}

//
// Return the device control block
//
DCB CSerialPort::GetDCB()
{
	return m_dcb;
}

//
// Return the communication event masks
//
DWORD CSerialPort::GetCommEvents()
{
	return m_dwCommEvents;
}

//
// Return the output buffer size
//
DWORD CSerialPort::GetWriteBufferSize()
{
	return m_nWriteBufferSize;
}

///////////////////////////////////////////////////////////////////
//增加4个函数方便收发数据块
//SendBlock(BYTE *pBuf, unsigned long nLength):发送数据块
//virtual OnReceived(BYTE *pBuf, UINT nLength):当接受到指定长度的数据块时
//默认函数将发送消息给窗口
//SetExpRcv(nLength):设定接收数据块的长度

unsigned long CSerialPort::SendBlock(BYTE *pBuf, unsigned long nLength)
{
	
	BOOL bWrite = TRUE;
	BOOL bResult = TRUE;
	unsigned long nBytesSent=0;
	DWORD BytesSent = 0;
//	ResetEvent(this->m_hWriteEvent);

	// Gain ownership of the critical section
	EnterCriticalSection(&this->m_csCommunicationSync);

	if (bWrite)
	{
		// Initailize variables
		this->m_ov.Offset = 0;
		this->m_ov.OffsetHigh = 0;

		// Clear buffer
		PurgeComm(this->m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);

		bResult = WriteFile(this->m_hComm,	// Handle to COMM Port
							pBuf,	// Pointer to message buffer in calling finction
							nLength,	// Length of message to send
							&nBytesSent,	// Where to store the number of bytes sent
							&this->m_ov);	// Overlapped structure

		// deal with any error codes
		if (!bResult)  
		{
			DWORD dwError = GetLastError();
			switch (dwError)
			{
				case ERROR_IO_PENDING:
					{
						// continue to GetOverlappedResults()
						nBytesSent = 0;
						bWrite = FALSE;
						break;
					}
				default:
					{
						// all other error codes
						this->ProcessErrorMessage("WriteFile()");
					}
			}
		} 
		else
		{
			LeaveCriticalSection(&this->m_csCommunicationSync);
		}
	} // end if(bWrite)

	if (!bWrite)
	{
		bWrite = TRUE;
	
		bResult = GetOverlappedResult(this->m_hComm,	// Handle to COMM port 
									  &this->m_ov,		// Overlapped structure
									  &nBytesSent,		// Stores number of bytes sent
									  TRUE); 			// Wait flag

		LeaveCriticalSection(&this->m_csCommunicationSync);

		// deal with the error code 
		if (!bResult)  
		{
			this->ProcessErrorMessage("GetOverlappedResults() in WriteFile()");
		}	
	} // end if (!bWrite)

	// Verify that the data size send equals what we tried to send
	if (nBytesSent != nLength)
	{
		TRACE("WARNING: WriteFile() error.. Bytes Sent: %d; Message Length: %d\n", BytesSent, strlen((char*)this->m_szWriteBuffer));
	}
	TRACE("Byts Sent:%d\n",nBytesSent);
	return	nBytesSent;
}

void CSerialPort::ReceiveBlock(COMSTAT comstat)
{
	BOOL  bRead = TRUE; 
	BOOL  bResult = TRUE;
	DWORD dwError = 0;
	DWORD nBytesRcv = 0;
	for (;;) 
	{ 
		// Gain ownership of the comm port critical section.
		// This process guarantees no other part of this program 
		// is using the port object. 
		EnterCriticalSection(&this->m_csCommunicationSync);

		// ClearCommError() will update the COMSTAT structure and
		// clear any other errors.
		bResult = ClearCommError(this->m_hComm, &dwError, &comstat);
		LeaveCriticalSection(&this->m_csCommunicationSync);
		if (comstat.cbInQue == 0)
		{
			// break out when all bytes have been read
			break;
		}
		EnterCriticalSection(&this->m_csCommunicationSync);
		if (bRead)
		{
			bResult = ReadFile(this->m_hComm,		// Handle to COMM port 
							   RxdBuf,				// RX Buffer Pointer
							   m_nBytesExpected,	// Read one byte
							   &nBytesRcv,			// Stores number of bytes read
							   &this->m_ov);		// pointer to the m_ov structure
			// deal with the error code 
			if (!bResult)  
			{ 
				switch (dwError = GetLastError()) 
				{ 
					case ERROR_IO_PENDING: 	
						{ 
							// asynchronous i/o is still in progress 
							// Proceed on to GetOverlappedResults();
							bRead = FALSE;
							break;
						}
					default:
						{
							// Another error has occured.  Process this error.
							this->ProcessErrorMessage("ReadFile()");
							break;
						} 
				}
			}
			else
			{
				// ReadFile() returned complete. It is not necessary to call GetOverlappedResults()
				bRead = TRUE;
			}
		}  // close if (bRead)

		if (!bRead)
		{
			bRead = TRUE;
			bResult = GetOverlappedResult(this->m_hComm,	// Handle to COMM port 
										  &this->m_ov,		// Overlapped structure
										  &nBytesRcv,		// Stores number of bytes read
										  TRUE); 			// Wait flag

			// deal with the error code 
			if (!bResult)  
			{
				this->ProcessErrorMessage("GetOverlappedResults() in ReadFile()");
			}	
		}  // close if (!bRead)
				
		LeaveCriticalSection(&this->m_csCommunicationSync);

		// notify parent that a byte was received
		 OnReceived ((BYTE*)RxdBuf, nBytesRcv);
	} // end forever loop
}

void CSerialPort::OnReceived(BYTE *pBuf, UINT nLength)
{
	::PostMessage((this->m_pOwner)->m_hWnd, WM_COMM_RXD, (WPARAM)pBuf, (LPARAM)nLength);
}

void CSerialPort::SetExpRcv(UINT nLength)
{
	m_nBytesExpected=nLength;
	if(RxdBuf==NULL)
	{
		RxdBuf=new BYTE[nLength+128];
	}
	else
	{
		delete	RxdBuf;
		RxdBuf=new BYTE[nLength+128];
	}
}

//
// Initialize the port. This can be port 1 to 4.
//
BOOL CSerialPort::InitPort(CWnd* pPortOwner,	// the owner (CWnd) of the port (receives message)
						   UINT  portnr,		// portnumber (1..4)
						   UINT  baud,			// baudrate
						   char  parity,		// parity 
						   UINT  databits,		// databits 
						   UINT  stopbits,		// stopbits 
						   DWORD dwCommEvents,	// EV_RXCHAR, EV_CTS etc
						   UINT  writebuffersize)	// size to the writebuffer
{
//	assert(portnr > 0 && portnr < 5);
	assert(pPortOwner != NULL);
	// if the thread is alive: Kill
	if (m_bThreadAlive)
	{
		do
		{
			SetEvent(m_hShutdownEvent);
		} while (m_bThreadAlive);
		TRACE("Thread ended\n");
	}
	// create events
	if (m_ov.hEvent != NULL)
		ResetEvent(m_ov.hEvent);
	m_ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);

	if (m_hWriteEvent != NULL)
		ResetEvent(m_hWriteEvent);
	m_hWriteEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
	
	if (m_hShutdownEvent != NULL)
		ResetEvent(m_hShutdownEvent);
	m_hShutdownEvent = CreateEvent(NULL, TRUE, FALSE, NULL);

	// initialize the event objects
	m_hEventArray[0] = m_hShutdownEvent;	// highest priority
	m_hEventArray[1] = m_ov.hEvent;
	m_hEventArray[2] = m_hWriteEvent;

	// initialize critical section
	InitializeCriticalSection(&m_csCommunicationSync);
	
	// set buffersize for writing and save the owner
	m_pOwner = pPortOwner;

	if (m_szWriteBuffer != NULL)
		delete [] m_szWriteBuffer;
	m_szWriteBuffer = new char[writebuffersize];

	m_nPortNr = portnr;

	m_nWriteBufferSize = writebuffersize;
	m_dwCommEvents = dwCommEvents;

	BOOL bResult = FALSE;
	char *szPort = new char[50];
	char *szBaud = new char[50];

	// now it critical!
	EnterCriticalSection(&m_csCommunicationSync);

	// if the port is already opened: close it
	if (m_hComm != NULL)
	{
		CloseHandle(m_hComm);
		m_hComm = NULL;
	}

	// prepare port strings
	sprintf(szPort, "COM%d", portnr);
	sprintf(szBaud, "baud=%d parity=%c data=%d stop=%d", baud, parity, databits, stopbits);

	// get a handle to the port
	m_hComm = CreateFile(szPort,						// communication port string (COMX)
					     GENERIC_READ | GENERIC_WRITE,	// read/write types
					     0,								// comm devices must be opened with exclusive access
					     NULL,							// no security attributes
					     OPEN_EXISTING,					// comm devices must use OPEN_EXISTING
					     FILE_FLAG_OVERLAPPED,			// Async I/O
					     0);							// template must be 0 for comm devices

	if (m_hComm == INVALID_HANDLE_VALUE)
	{
		// port not found
		delete [] szPort;
		delete [] szBaud;

		return FALSE;
	}

	// set the timeout values
	m_CommTimeouts.ReadIntervalTimeout = 1000;
	m_CommTimeouts.ReadTotalTimeoutMultiplier = 1000;
	m_CommTimeouts.ReadTotalTimeoutConstant = 1000;
	m_CommTimeouts.WriteTotalTimeoutMultiplier = 1000;
	m_CommTimeouts.WriteTotalTimeoutConstant = 1000;

	// configure
	if (SetCommTimeouts(m_hComm, &m_CommTimeouts))
	{						   
		if (SetCommMask(m_hComm, dwCommEvents))
		{
			if (GetCommState(m_hComm, &m_dcb))
			{
				m_dcb.fRtsControl = RTS_CONTROL_ENABLE;		// set RTS bit high!
				if (BuildCommDCB(szBaud, &m_dcb))
				{
					if (SetCommState(m_hComm, &m_dcb))
						; // normal operation... continue
					else
						ProcessErrorMessage("SetCommState()");
				}
				else
					ProcessErrorMessage("BuildCommDCB()");
			}
			else
				ProcessErrorMessage("GetCommState()");
		}
		else
			ProcessErrorMessage("SetCommMask()");
	}
	else
		ProcessErrorMessage("SetCommTimeouts()");

	delete [] szPort;
	delete [] szBaud;

	// flush the port
	PurgeComm(m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);

	// release critical section
	LeaveCriticalSection(&m_csCommunicationSync);

	TRACE("Initialisation for communicationport %d completed.\nUse Startmonitor to communicate.\n", portnr);

	return TRUE;
}

void CSerialPort::ClearDTR()
{
	Escape(CLRDTR);
}

void CSerialPort::ClearRTS()
{
	Escape(CLRRTS);
}

void CSerialPort::SetDTR()
{
	Escape(SETDTR);
}

void CSerialPort::SetRTS()
{
	Escape(SETRTS);
}

void CSerialPort::SetXOFF()
{
	Escape(SETXOFF);
}

void CSerialPort::SetXON()
{
	Escape(SETXON);
}


void CSerialPort::SetBREAK()
{
Escape(SETBREAK);
}

void CSerialPort::ClearBREAK()
{
Escape(CLRBREAK);
}

void CSerialPort::Escape(DWORD dwFunc)
{
	ASSERT(IsOpen());
	
	if (!EscapeCommFunction(m_hComm, dwFunc))
	{
		TRACE(_T("Failed in call to EscapeCommFunction\n"));
		//		AfxThrowSerialException();
	}
}

BOOL CSerialPort::DestoryIt(CWnd *pPortOwner, UINT portnr)
{
	if (m_hComm == INVALID_HANDLE_VALUE)
	{
		// port not found
	if (m_bThreadAlive)
	{
		do
		{
			SetEvent(m_hShutdownEvent);
		} while (m_bThreadAlive);
		TRACE("Thread ended\n");
	}
		CloseHandle(m_hComm);

	}
return 0;
}