serialport.cpp

串口调试助手V2.2的源程序。做了小幅修改

		// until one of nine events occur that require action.
		Event = WaitForMultipleObjects(3, port->m_hEventArray, FALSE, INFINITE);
		
		
		switch (Event)
		{

		case 0:
			{
				// Shutdown event.  This is event zero so it will be
				// the higest priority and be serviced first.
				CloseHandle(port->m_hComm);
				port->m_hComm=NULL;
				port->m_bThreadAlive = FALSE;
				
				// Kill this thread.  break is not needed, but makes me feel better.
				AfxEndThread(100);

				break;
			}
		case 1:	// read event
			{              
				GetCommMask(port->m_hComm, &CommEvent);
				if (CommEvent & EV_RXCHAR)
					// Receive character event from port.
					//memset( &comstat, 0, sizeof(COMSTAT) );
					ReceiveChar(port, comstat);		
				if (CommEvent & EV_CTS)
					::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_CTS_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
				if (CommEvent & EV_BREAK)
					::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_BREAK_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
				if (CommEvent & EV_ERR)
					::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_ERR_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
				if (CommEvent & EV_RING)
					::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_RING_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
				
				if (CommEvent & EV_RXFLAG)
					::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_RXFLAG_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
					
				break;
			}  
		case 2: // write event
			{
				// Write character event from port
				WriteChar(port);
				break;
			}

		} // end switch

	} // close forever loop

	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)
{
	BOOL bWrite = TRUE;
	BOOL bResult = TRUE;

	DWORD BytesSent = 0;

	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_szWriteBuffer,					// Pointer to message buffer in calling finction
//							strlen((char*)port->m_szWriteBuffer),	// Length of message to send
							port->m_nWriteSize,	// 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 != port->m_nWriteSize)	// Length of message to send)
	{
		TRACE("WARNING: WriteFile() error.. Bytes Sent: %d; Message Length: %d\n", BytesSent, strlen((char*)port->m_szWriteBuffer));
	}
//	::SendMessage((port->m_pOwner)->m_hWnd, WM_COMM_TXEMPTY_DETECTED, (WPARAM) RXBuff, (LPARAM) port->m_nPortNr);
//	::SendMessage((port->m_pOwner)->m_hWnd, WM_COMM_TXEMPTY_DETECTED,0,(LPARAM) port->m_nPortNr);
}

//
// Character received. Inform the owner
//
//void CSerialPort::ReceiveChar(CSerialPort* port, COMSTAT comstat)
//{
//	BOOL  bRead = TRUE; 
//	BOOL  bResult = TRUE;
//	DWORD dwError = 0;
//	DWORD BytesRead = 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
//							   &BytesRead,			// 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(char* string)
{		
	assert(m_hComm != 0);
	
	memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer));
	strcpy(m_szWriteBuffer, string);
	m_nWriteSize=strlen(string);

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


void CSerialPort::WriteToPort(char* string,int n)
{		
	assert(m_hComm != 0);

	memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer));
//	memset(m_szWriteBuffer, 0, n);
//	strncpy(m_szWriteBuffer, string, n);
	memcpy(m_szWriteBuffer, string, n);
	m_nWriteSize=n;

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

void CSerialPort::WriteToPort(LPCTSTR string)
{		
	assert(m_hComm != 0);

	memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer));
	strcpy(m_szWriteBuffer, string);
	m_nWriteSize=strlen(string);

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

void CSerialPort::WriteToPort(LPCTSTR string,int n)
{		
	assert(m_hComm != 0);

	memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer));
//	strncpy(m_szWriteBuffer, string, n);
	memcpy(m_szWriteBuffer, string, n);
	m_nWriteSize=n;
	// 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;
}


void CSerialPort::ClosePort()
{
		SetEvent(m_hShutdownEvent);
}

/*
void CSerialPort::ClosePort()
{
	do
	{
		SetEvent(m_hShutdownEvent);
	} while (m_bThreadAlive);

	
	// if the port is still opened: close it 
	if (m_hComm != NULL)
	{
		CloseHandle(m_hComm);
		m_hComm = NULL;
	}
	// Close Handles  
	if(m_hShutdownEvent!=NULL)
		CloseHandle( m_hShutdownEvent); 
	if(m_ov.hEvent!=NULL)
		CloseHandle( m_ov.hEvent ); 
	if(m_hWriteEvent!=NULL)
		CloseHandle( m_hWriteEvent ); 

	TRACE("Thread ended\n");
	delete [] m_szWriteBuffer;
}

*/