封装类

+/*
+**	FILENAME			CSerialPort.cpp
+**
+**	PURPOSE				This class can read, write and watch one serial port.
+**						It sends messages to its owner when something happends on the port
+**						The class creates a thread for reading and writing so the main
+**						program is not blocked.
+**
+**	CREATION DATE		15-09-1997
+**	LAST MODIFICATION	12-11-1997
+**
+**	AUTHOR				Remon Spekreijse
+**
+**  2007-12-25 mrlong https://code.google.com/p/mycom/
+**  2011-11-06 liquanhai http://blog.csdn.net/liquanhai/article/details/6941574
+**  2013-12-04 viruscamp http://github.com/viruscamp/CSerialPort
+**
+*/
+
+#include "stdafx.h"
+#include "SerialPort.h"
+
+#include <assert.h>
+ 
+//
+// Constructor
+//
+CSerialPort::CSerialPort()
+{
+	m_hComm = NULL;
+
+	// initialize overlapped structure members to zero
+	m_ov.Offset = 0;
+	m_ov.OffsetHigh = 0;
+
+	// create events
+	m_ov.hEvent = NULL;
+	m_hWriteEvent = NULL;
+	m_hShutdownEvent = NULL;
+
+	m_szWriteBuffer = NULL;
+
+	m_bThreadAlive = FALSE;
+	m_nWriteSize = 1;
+	m_userdata = 0;
+}
+
+//
+// Delete dynamic memory
+//
+CSerialPort::~CSerialPort()
+{
+	do
+	{
+		SetEvent(m_hShutdownEvent);
+	} while (m_bThreadAlive);
+
+	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;
+}
+
+//
+// Initialize the port. This can be port 1 to 4.
+//
+//
+//parity:
+//  n=none
+//  e=even
+//  o=odd
+//  m=mark
+//  s=space
+//data:
+//  5,6,7,8
+//stop:
+//  1,1.5,2 
+//
+BOOL CSerialPort::InitPort(HWND 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
+						   DWORD userdata,
+						   
+						   DWORD   ReadIntervalTimeout,
+						   DWORD   ReadTotalTimeoutMultiplier,
+						   DWORD   ReadTotalTimeoutConstant,
+						   DWORD   WriteTotalTimeoutMultiplier,
+						   DWORD   WriteTotalTimeoutConstant )	
+
+{
+	assert(portnr > 0 && portnr < 200);
+	assert(pPortOwner != NULL);
+
+	// if the thread is alive: Kill
+	if (m_bThreadAlive)
+	{
+		do
+		{
+			SetEvent(m_hShutdownEvent);
+		} while (m_bThreadAlive);
+		//TRACE("Thread ended\n");
+	}
+	m_userdata = userdata;
+
+	// create events
+	if (m_ov.hEvent != NULL)
+		ResetEvent(m_ov.hEvent);
+	else
+		m_ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
+
+	if (m_hWriteEvent != NULL)
+		ResetEvent(m_hWriteEvent);
+	else
+		m_hWriteEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
+	
+	if (m_hShutdownEvent != NULL)
+		ResetEvent(m_hShutdownEvent);
+	else
+		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);
+
+	// stop is index 0 = 1 1=1.5 2=2
+	int mystop;
+	int myparity;
+	switch(stopbits)
+	{
+		case 0:
+			mystop = ONESTOPBIT;
+			break;
+		case 1:
+			mystop = ONE5STOPBITS;
+			break;
+		case 2:
+			mystop = TWOSTOPBITS;
+			break;
+	}
+	myparity = 0;
+	parity = toupper(parity);
+	switch(parity)
+	{
+		case 'N':
+			myparity = 0;
+			break;
+		case 'O':
+			myparity = 1;
+			break;
+		case 'E':
+			myparity = 2;
+			break;
+		case 'M':
+			myparity = 3;
+			break;
+		case 'S':
+			myparity = 4;
+			break;
+	}
+	sprintf(szBaud, "baud=%d parity=%c data=%d stop=%d", baud, parity, databits, mystop);
+
+	// 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		 = ReadIntervalTimeout * 1000;
+	m_CommTimeouts.ReadTotalTimeoutMultiplier  = ReadTotalTimeoutMultiplier * 1000;
+	m_CommTimeouts.ReadTotalTimeoutConstant	= ReadTotalTimeoutConstant * 1000;
+	m_CommTimeouts.WriteTotalTimeoutMultiplier = WriteTotalTimeoutMultiplier * 1000;
+	m_CommTimeouts.WriteTotalTimeoutConstant   = WriteTotalTimeoutConstant * 1000;
+
+	// configure
+	if (SetCommTimeouts(m_hComm, &m_CommTimeouts))
+	{						   
+		if (SetCommMask(m_hComm, dwCommEvents))
+		{
+			if (GetCommState(m_hComm, &m_dcb))
+			{
+				m_dcb.EvtChar = 'q';
+				m_dcb.fRtsControl = RTS_CONTROL_ENABLE;		// set RTS bit high!
+				m_dcb.BaudRate = baud;  // add by mrlong
+				m_dcb.Parity   = myparity;
+				m_dcb.ByteSize = databits;
+				m_dcb.StopBits = mystop;
+						
+				//if (BuildCommDCB(szBaud, &m_dcb))
+				//{
+					if (SetCommState(m_hComm, &m_dcb) == FALSE)
+						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;
+}
+
+//
+//  The CommThread Function.
+//
+DWORD WINAPI CSerialPort::CommThread(LPVOID pParam)
+{
+	// Cast the void pointer passed to the thread back to
+	// a pointer of CSerialPort class
+	CSerialPort *port = (CSerialPort*)pParam;
+	
+	// Set the status variable in the dialog class to
+	// TRUE to indicate the thread is running.
+	port->m_bThreadAlive = TRUE;	
+		
+	// Misc. variables
+	DWORD BytesTransfered = 0; 
+	DWORD Event = 0;
+	DWORD CommEvent = 0;
+	DWORD dwError = 0;
+	COMSTAT comstat;
+	BOOL  bResult = TRUE;
+		
+	// Clear comm buffers at startup
+	if (port->m_hComm)		// check if the port is opened
+		PurgeComm(port->m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);
+
+	// begin forever loop.  This loop will run as long as the thread is alive.
+	for (;;) 
+	{ 
+
+		// Make a call to WaitCommEvent().  This call will return immediatly
+		// because our port was created as an async port (FILE_FLAG_OVERLAPPED
+		// and an m_OverlappedStructerlapped structure specified).  This call will cause the 
+		// m_OverlappedStructerlapped element m_OverlappedStruct.hEvent, which is part of the m_hEventArray to 
+		// be placed in a non-signeled state if there are no bytes available to be read,
+		// or to a signeled state if there are bytes available.  If this event handle 
+		// is set to the non-signeled state, it will be set to signeled when a 
+		// character arrives at the port.
+
+		// we do this for each port!
+
+		bResult = WaitCommEvent(port->m_hComm, &Event, &port->m_ov);
+
+		if (!bResult)  
+		{ 
+			// If WaitCommEvent() returns FALSE, process the last error to determin
+			// the reason..
+			switch (dwError = GetLastError()) 
+			{ 
+			case ERROR_IO_PENDING: 	
+				{ 
+					// This is a normal return value if there are no bytes
+					// to read at the port.
+					// Do nothing and continue
+					break;
+				}
+			case 87:
+				{
+					// Under Windows NT, this value is returned for some reason.
+					// I have not investigated why, but it is also a valid reply
+					// Also do nothing and continue.
+					break;
+				}
+			default:
+				{
+					// All other error codes indicate a serious error has
+					// occured.  Process this error.
+					port->ProcessErrorMessage("WaitCommEvent()");
+					break;
+				}
+			}
+		}
+		else
+		{
+			// If WaitCommEvent() returns TRUE, check to be sure there are
+			// actually bytes in the buffer to read.  
+			//
+			// If you are reading more than one byte at a time from the buffer 
+			// (which this program does not do) you will have the situation occur 
+			// where the first byte to arrive will cause the WaitForMultipleObjects() 
+			// function to stop waiting.  The WaitForMultipleObjects() function 
+			// resets the event handle in m_OverlappedStruct.hEvent to the non-signelead state
+			// as it returns.  
+			//
+			// If in the time between the reset of this event and the call to 
+			// ReadFile() more bytes arrive, the m_OverlappedStruct.hEvent handle will be set again
+			// to the signeled state. When the call to ReadFile() occurs, it will 
+			// read all of the bytes from the buffer, and the program will
+			// loop back around to WaitCommEvent().
+			// 
+			// At this point you will be in the situation where m_OverlappedStruct.hEvent is set,
+			// but there are no bytes available to read.  If you proceed and call
+			// ReadFile(), it will return immediatly due to the async port setup, but
+			// GetOverlappedResults() will not return until the next character arrives.
+			//
+			// It is not desirable for the GetOverlappedResults() function to be in 
+			// this state.  The thread shutdown event (event 0) and the WriteFile()
+			// event (Event2) will not work if the thread is blocked by GetOverlappedResults().
+			//
+			// The solution to this is to check the buffer with a call to ClearCommError().
+			// This call will reset the event handle, and if there are no bytes to read
+			// we can loop back through WaitCommEvent() again, then proceed.
+			// If there are really bytes to read, do nothing and proceed.
+		
+			bResult = ClearCommError(port->m_hComm, &dwError, &comstat);
+
+			if (comstat.cbInQue == 0)
+				continue;
+		}	// end if bResult
+
+		// Main wait function.  This function will normally block the thread
+		// 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.
+
+			 	port->m_bThreadAlive = FALSE;
+				
+				// Kill this thread.  break is not needed, but makes me feel better.
+				//AfxEndThread(100);
+				::ExitThread(100);
+
+				break;
+			}
+		case 1:	// read event
+			{
+				GetCommMask(port->m_hComm, &CommEvent);
+				if (CommEvent & EV_RXCHAR) //接收到字符，并置于输入缓冲区中 
+					ReceiveChar(port);
+				
+				if (CommEvent & EV_CTS) //CTS信号状态发生变化
+					::SendMessage(port->m_pOwner, WM_COMM_CTS_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
+				if (CommEvent & EV_RXFLAG) //接收到事件字符，并置于输入缓冲区中 
+					::SendMessage(port->m_pOwner, WM_COMM_RXFLAG_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
+				if (CommEvent & EV_BREAK)  //输入中发生中断
+					::SendMessage(port->m_pOwner, WM_COMM_BREAK_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
+				if (CommEvent & EV_ERR) //发生线路状态错误，线路状态错误包括CE_FRAME,CE_OVERRUN和CE_RXPARITY 
+					::SendMessage(port->m_pOwner, WM_COMM_ERR_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
+				if (CommEvent & EV_RING) //检测到振铃指示
+					::SendMessage(port->m_pOwner, WM_COMM_RING_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)))
+	if (!(m_Thread = ::CreateThread (NULL, 0, CommThread, this, 0, NULL )))
+		return FALSE;
+	//TRACE("Thread started\n");
+	return TRUE;	
+}
+
+//
+// Restart the comm thread
+//
+BOOL CSerialPort::RestartMonitoring()
+{
+	//TRACE("Thread resumed\n");
+	//m_Thread->ResumeThread();
+	::ResumeThread(m_Thread);
+	return TRUE;	
+}
+
+
+//
+// Suspend the comm thread
+//
+BOOL CSerialPort::StopMonitoring()
+{
+	//TRACE("Thread suspended\n");
+	//m_Thread->SuspendThread();
+	::SuspendThread(m_Thread);
+	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;
+	DWORD SendLen   = port->m_nWriteSize;
+	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
+							SendLen,	// add by mrlong
+							//strlen((char*)port->m_szWriteBuffer),	// 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 != SendLen /*strlen((char*)port->m_szWriteBuffer)*/)  // add by 
+	{
+		//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)
+{
+	BOOL  bRead = TRUE; 
+	BOOL  bResult = TRUE;
+	DWORD dwError = 0;
+	DWORD BytesRead = 0;
+	DWORD lparam = 0;
+	COMSTAT comstat;
+	unsigned char RXBuff;
+
+	for (;;) 
+	{ 
+		//add by liquanhai 2011-11-06  防止死锁
+		if(WaitForSingleObject(port->m_hShutdownEvent,0)==WAIT_OBJECT_0)
+			return;
+
+		// 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
+		lparam = RXBuff;
+		lparam = lparam<<16|port->m_nPortNr;
+		::SendMessage((port->m_pOwner), WM_COMM_RXCHAR, port->m_userdata,lparam);
+	} // 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); // add by mrlong
+	// 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;
+}
+
+BOOL CSerialPort::IsOpen()
+{
+	return m_hComm != NULL;
+}
+
+void CSerialPort::ClosePort()
+{
+	MSG message;
+	do
+	{
+		SetEvent(m_hShutdownEvent);
+		if(::PeekMessage(&message,m_pOwner,0,0,PM_REMOVE))
+		{
+			::TranslateMessage(&message);
+			::DispatchMessage(&message);
+		}
+	} 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)
+		ResetEvent(m_hShutdownEvent);
+	if(m_ov.hEvent!=NULL)
+		ResetEvent(m_ov.hEvent);
+	if(m_hWriteEvent!=NULL)
+		ResetEvent(m_hWriteEvent);			
+		
+	//delete [] m_szWriteBuffer;
+	
+}
+
+void CSerialPort::WriteToPort(char* string,int n)
+{
+	assert(m_hComm != 0);
+	memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer));
+	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(BYTE* Buffer, int n)
+{
+	assert(m_hComm != 0);
+	memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer));
+	int i;
+	for(i=0; i<n; i++)
+	{
+		m_szWriteBuffer[i] = Buffer[i];
+	}
+	m_nWriteSize=n;
+
+	// set event for write
+	SetEvent(m_hWriteEvent);
+}
+
+
+void CSerialPort::SendData(LPCTSTR lpszData, const int nLength)
+{
+	assert(m_hComm != 0);
+	memset(m_szWriteBuffer, 0, nLength);
+	strcpy(m_szWriteBuffer, lpszData);
+	m_nWriteSize=nLength;
+	// set event for write
+	SetEvent(m_hWriteEvent);
+}
+
+BOOL CSerialPort::RecvData(LPTSTR lpszData, const int nSize)
+{
+	//
+	//接收数据
+	//
+	assert(m_hComm!=0);
+	memset(lpszData,0,nSize);
+	DWORD mylen  = 0;
+	DWORD mylen2 = 0;
+	while (mylen<nSize) {
+		if(!ReadFile(m_hComm,lpszData,nSize,&mylen2,NULL)) 
+			return FALSE;
+		mylen += mylen2;
+
+		
+	}
+	
+	return TRUE;
+}

+/*
+**	FILENAME			CSerialPort.h
+**
+**	PURPOSE				This class can read, write and watch one serial port.
+**						It sends messages to its owner when something happends on the port
+**						The class creates a thread for reading and writing so the main
+**						program is not blocked.
+**
+**	CREATION DATE		15-09-1997
+**	LAST MODIFICATION	12-11-1997
+**
+**	AUTHOR				Remon Spekreijse
+**
+**
+************************************************************************************
+**  author: mrlong date:2007-12-25
+**
+**  改进
+**	1) 增加 ClosePort
+**	2) 增加 WriteToPort 两个方法
+**	3) 增加 SendData 与 RecvData 方法
+************************************************************************************
+************************************************************************************
+**  author：liquanhai date:2011-11-04
+**
+**  改进
+**	1) 增加 ClosePort 中交出控制权，防止死锁问题
+**	2) 增加 ReceiveChar 中防止线程死锁
+************************************************************************************
+************************************************************************************
+**  author：viruscamp date:2013-12-04
+**
+**  改进
+**	1) 增加 IsOpen 判断是否打开
+**	2) 修正 InitPort 中 parity Odd Even 参数取值错误
+**	3) 修改 InitPort 中 portnr 取值范围，portnr>9 时特殊处理
+**	4) 取消对 MFC 的依赖，使用 HWND 替代 CWnd，使用 win32 thread 函数而不是 MFC 的
+**	5) 增加用户消息编号自定义，方法来自 CnComm
+*/
+
+#ifndef __SERIALPORT_H__
+#define __SERIALPORT_H__
+
+#ifndef WM_COMM_MSG_BASE 
+	#define WM_COMM_MSG_BASE		WM_USER + 617		//!< 消息编号的基点  
+#endif
+
+#define WM_COMM_BREAK_DETECTED		WM_COMM_MSG_BASE + 1	// A break was detected on input.
+#define WM_COMM_CTS_DETECTED		WM_COMM_MSG_BASE + 2	// The CTS (clear-to-send) signal changed state. 
+#define WM_COMM_DSR_DETECTED		WM_COMM_MSG_BASE + 3	// The DSR (data-set-ready) signal changed state. 
+#define WM_COMM_ERR_DETECTED		WM_COMM_MSG_BASE + 4	// A line-status error occurred. Line-status errors are CE_FRAME, CE_OVERRUN, and CE_RXPARITY. 
+#define WM_COMM_RING_DETECTED		WM_COMM_MSG_BASE + 5	// A ring indicator was detected. 
+#define WM_COMM_RLSD_DETECTED		WM_COMM_MSG_BASE + 6	// The RLSD (receive-line-signal-detect) signal changed state. 
+#define WM_COMM_RXCHAR				WM_COMM_MSG_BASE + 7	// A character was received and placed in the input buffer. 
+#define WM_COMM_RXFLAG_DETECTED		WM_COMM_MSG_BASE + 8	// The event character was received and placed in the input buffer.  
+#define WM_COMM_TXEMPTY_DETECTED	WM_COMM_MSG_BASE + 9	// The last character in the output buffer was sent.  
+
+class CSerialPort
+{														 
+public:
+	// contruction and destruction
+	CSerialPort();
+	virtual		~CSerialPort();
+
+	// port initialisation											
+	BOOL		InitPort(HWND pPortOwner, UINT portnr = 1, UINT baud = 19200, 
+				char parity = 'N', UINT databits = 8, UINT stopsbits = 1, 
+				DWORD dwCommEvents = EV_RXCHAR | EV_CTS, UINT nBufferSize = 512,
+				DWORD userdata = 0,
+			
+				DWORD ReadIntervalTimeout = 1000,
+				DWORD ReadTotalTimeoutMultiplier = 1000,
+				DWORD ReadTotalTimeoutConstant = 1000,
+				DWORD WriteTotalTimeoutMultiplier = 1000,
+				DWORD WriteTotalTimeoutConstant = 1000);
+
+	// start/stop comm watching
+	BOOL		StartMonitoring();
+	BOOL		RestartMonitoring();
+	BOOL		StopMonitoring();
+
+	DWORD		GetWriteBufferSize();
+	DWORD		GetCommEvents();
+	DCB			GetDCB();
+
+	void		WriteToPort(char* string);
+	void		WriteToPort(char* string,int n); // add by mrlong 2007-12-25
+	void		WriteToPort(LPCTSTR string);	 // add by mrlong 2007-12-25
+	void		WriteToPort(BYTE* Buffer, int n);// add by mrlong
+	void		ClosePort();					 // add by mrlong 2007-12-2  
+	BOOL		IsOpen();
+
+	void SendData(LPCTSTR lpszData, const int nLength);   //串口发送函数 by mrlong 2008-2-15
+	BOOL RecvData(LPTSTR lpszData, const int nSize);	  //串口接收函数 by mrlong 2008-2-15
+
+protected:
+	// protected memberfunctions
+	void		ProcessErrorMessage(char* ErrorText);
+	static DWORD WINAPI CommThread(LPVOID pParam);
+	static void	ReceiveChar(CSerialPort* port);
+	static void	WriteChar(CSerialPort* port);
+
+	// thread
+	//CWinThread*			m_Thread;
+	HANDLE			  m_Thread;
+
+	// synchronisation objects
+	CRITICAL_SECTION	m_csCommunicationSync;
+	BOOL				m_bThreadAlive;
+
+	// handles
+	HANDLE				m_hShutdownEvent;  //stop发生的事件
+	HANDLE				m_hComm;		   // read  
+	HANDLE				m_hWriteEvent;	 // write
+
+	// Event array. 
+	// One element is used for each event. There are two event handles for each port.
+	// A Write event and a receive character event which is located in the overlapped structure (m_ov.hEvent).
+	// There is a general shutdown when the port is closed. 
+	HANDLE				m_hEventArray[3];
+
+	// structures
+	OVERLAPPED			m_ov;
+	COMMTIMEOUTS		m_CommTimeouts;
+	DCB					m_dcb;
+
+	// owner window
+	//CWnd*				m_pOwner;
+	HWND				m_pOwner;
+
+
+	// misc
+	UINT				m_nPortNr;		//?????
+	char*				m_szWriteBuffer;
+	DWORD				m_dwCommEvents;
+	DWORD				m_nWriteBufferSize;
+
+	int				 m_nWriteSize; //add by mrlong 2007-12-25
+	int 			m_userdata;
+};
+
+#endif __SERIALPORT_H__