serialport.cpp

改写的串口编程类,适合使用非控件编程使用,很好用的一个类.

	return 0;
}

//
// start comm watching
//
BOOL CSerialPort::StartMonitoring()
{
	if (!(m_Thread = AfxBeginThread(CommThread, this)))
		return FALSE;
	TRACE("Thread started\n");
	return TRUE;	
}

//
// Restart the comm thread
//
BOOL CSerialPort::RestartMonitoring()
{
	TRACE("Thread resumed\n");
	m_Thread->ResumeThread();
	return TRUE;	
}


//
// Suspend the comm thread
//
BOOL CSerialPort::StopMonitoring()
{
	TRACE("Thread suspended\n");
	m_Thread->SuspendThread(); 
	return TRUE;	
}


//
// If there is a error, give the right message
//
void CSerialPort::ProcessErrorMessage(char* ErrorText)
{
	char *Temp = new char[200];
	
	LPVOID lpMsgBuf;
	
	FormatMessage( 
		FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
		NULL,
		GetLastError(),
		MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
		(LPTSTR) &lpMsgBuf,
		0,
		NULL 
		);
	
	sprintf(Temp, "WARNING:  %s Failed with the following error: \n%s\nPort: %d\n", (char*)ErrorText, lpMsgBuf, m_nPortNr); 
	MessageBox(NULL, Temp, "Application Error", MB_ICONSTOP);
	
	LocalFree(lpMsgBuf);
	delete[] Temp;
}

//
// Write a character.
//
void CSerialPort::WriteChar(CSerialPort* port,int nLength)
{
	BOOL bWrite = TRUE;
	BOOL bResult = TRUE;
	//DWORD dwLength=nLength;
	DWORD BytesSent = nLength;
	ResetEvent(port->m_hWriteEvent);
	
	// Gain ownership of the critical section
	EnterCriticalSection(&port->m_csCommunicationSync);
	
	if (bWrite)
	{
		// Initailize variables
		port->m_ov.Offset = 0;
		port->m_ov.OffsetHigh = 0;
		
		// Clear buffer
		PurgeComm(port->m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);
		
		bResult = WriteFile(port->m_hComm,							// Handle to COMM Port
			port->m_bWriteBuffer,					// Pointer to message buffer in calling finction
			BytesSent,	                            // Length of message to send
			&BytesSent,								// Where to store the number of bytes sent
			&port->m_ov);							// Overlapped structure
		
		// deal with any error codes
		if (!bResult)  
		{
			DWORD dwError = GetLastError();
			switch (dwError)
			{
			case ERROR_IO_PENDING:
				{
					// continue to GetOverlappedResults()
					BytesSent = 0;
					bWrite = FALSE;
					break;
				}
			default:
				{
					// all other error codes
					port->ProcessErrorMessage("WriteFile()");
				}
			}
		} 
		else
		{
			LeaveCriticalSection(&port->m_csCommunicationSync);
		}
	} // end if(bWrite)
	
	if (!bWrite)
	{
		bWrite = TRUE;
		
		bResult = GetOverlappedResult(port->m_hComm,	// Handle to COMM port 
			&port->m_ov,		// Overlapped structure
			&BytesSent,		// Stores number of bytes sent
			TRUE); 			// Wait flag
		
		LeaveCriticalSection(&port->m_csCommunicationSync);
		
		// deal with the error code 
		if (!bResult)  
		{
			port->ProcessErrorMessage("GetOverlappedResults() in WriteFile()");
		}	
	} // end if (!bWrite)
	
	// Verify that the data size send equals what we tried to send
	if (BytesSent != strlen((char*)port->m_szWriteBuffer))
	{
		TRACE("WARNING: WriteFile() error.. Bytes Sent: %d; Message Length: %d\n", BytesSent, strlen((char*)port->m_szWriteBuffer));
	}
}

//
// Character received. Inform the owner
//
void CSerialPort::ReceiveChar(CSerialPort* port, COMSTAT comstat)
{
	BOOL  bRead = TRUE; 
	BOOL  bResult = TRUE;
	DWORD dwError = 0;
	DWORD BytesRead = 0;
	DWORD dwBytesRead = 0;
	unsigned char RXBuff;
	
	for (;;) 
	{ 
		// Gain ownership of the comm port critical section.
		// This process guarantees no other part of this program 
		// is using the port object. 
		
		EnterCriticalSection(&port->m_csCommunicationSync);
		
		// ClearCommError() will update the COMSTAT structure and
		// clear any other errors.
		
		bResult = ClearCommError(port->m_hComm, &dwError, &comstat);
		
		LeaveCriticalSection(&port->m_csCommunicationSync);
		
		// start forever loop.  I use this type of loop because I
		// do not know at runtime how many loops this will have to
		// run. My solution is to start a forever loop and to
		// break out of it when I have processed all of the
		// data available.  Be careful with this approach and
		// be sure your loop will exit.
		// My reasons for this are not as clear in this sample 
		// as it is in my production code, but I have found this 
		// solutiion to be the most efficient way to do this.
		
		if (comstat.cbInQue == 0)
		{
			// break out when all bytes have been read
			break;
		}
		
		EnterCriticalSection(&port->m_csCommunicationSync);
		
		if (bRead)
		{
			bResult = ReadFile(port->m_hComm,		// Handle to COMM port 
				&RXBuff,				// RX Buffer Pointer
				1,					// Read one byte
				&dwBytesRead,			// Stores number of bytes read
				&port->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.
						port->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(port->m_hComm,	// Handle to COMM port 
				&port->m_ov,		// Overlapped structure
				&BytesRead,		// Stores number of bytes read
				TRUE); 			// Wait flag
			
			// 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(BYTE bWriteBuffer[],int nWriteBufferSize) 
{
	/*
	assert(m_hComm != 0);
	
	memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer));
	strcpy(m_szWriteBuffer, string);
	
	// set event for write
	SetEvent(m_hWriteEvent);
	*/

	assert(m_hComm != 0); 
	int nSize = sizeof(bWriteBuffer)/sizeof(BYTE);
	m_nWriteBufferSize=nWriteBufferSize;
	m_nDataLength=nWriteBufferSize;
	for(int i=0;i<nWriteBufferSize;i++)
	{
		m_bWriteBuffer[i]=bWriteBuffer[i];
	}
	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;
}
///  把字符串转换为十六进制数据
void CSerialPort::StrToHex(unsigned char *lpBuffer, int *Total)
{
	if(((*Total) % 2) != 0)
	{
		strcat((char *)lpBuffer,"0");
		(*Total) ++;
	}
	
	unsigned char HexBuffer[1024];
	
	memset(HexBuffer,'\0',1024);
	
	int i ;
	for( i = 0 ; i < (*Total) ; i++)
	{
		
		if(lpBuffer[i] > 0x39)
			lpBuffer[i] -= 0x37 ;
		else
			lpBuffer[i] -= 0x30 ;
	}
	
	for(i=0 ; i < (*Total) ; i+=2)
	{
		HexBuffer[i/2] = lpBuffer[i] ;
		HexBuffer[i/2] <<= 4;
		
		HexBuffer[i/2] |= lpBuffer[i+1];
	}
	
	memcpy(lpBuffer,HexBuffer,(*Total)/2);
}

//  把十六进制数据转换为字符串
CString CSerialPort::HexToStr(unsigned char *lpDataBuffer,int Total)
{
	CString ReturnStr;
	char OneNumber[5];
	
	ReturnStr.Empty();
	memset(OneNumber,0,5);
	
	for(int i=0;i<Total;i++)
	{
		itoa(lpDataBuffer[i],OneNumber,16);
		
		if(strlen(OneNumber) < 2)
		{
			OneNumber[2] = OneNumber[1];
			OneNumber[1] = OneNumber[0];
			OneNumber[0] = '0';
		}
		ReturnStr+=OneNumber;
		ReturnStr+=", ";
		memset(OneNumber,0,5);
	}
	
	return ReturnStr;
}