serialport.cpp

经过不断的修改终于完善了一个很好用的类。

	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,
							&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
//
static long rxdatacount=0;//用于接收字符记数
void CSerialPort::ReceiveChar(CSerialPort* port, COMSTAT comstat)
{
//	CSerialPort* pDlg=NULL;
	BOOL  bRead = TRUE; 
	BOOL  bResult = TRUE;
	DWORD dwError = 0;
	DWORD BytesRead = 0;
	unsigned char RXBuff;

	static char rec[1024*16];//16K接收缓冲区
	static char cHead[16]={0x0A,0x06,0x01,0x00,0x00,0x00,0x00,
		            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
	static bool bUploadReady=FALSE;
	
	static long  lFileLength;
	static unsigned char b1;
	static unsigned char b2;
	static CString strdata,str;

	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
			rec[rxdatacount++]=RXBuff;//接收的字节
			// 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);
		
		if(rxdatacount>=15)
		{
			//rxdatacount=0;
			//计算文件长度
			b1=rec[5];
			b2=rec[4];
			lFileLength=b1;
			lFileLength<<=8;
			lFileLength|=b2;
			TRACE("rxdatacount=%ld",lFileLength);
			strdata.Format("%c",RXBuff);
			TRACE("%s",strdata);
			str+=strdata;
		}
		
		
		if(bUploadReady=TRUE&&rxdatacount==lFileLength+16)//接收配置文件并保存
		{
			//将收到的文件写入
			//查找路口名
			CStdioFile file;
			//str.Format("%s",strdata);
			long i=str.GetLength();
			TRACE("%ld",i);
			int nName=str.Find("name",0);
			int nDes=str.Find("desc",0);
			CString str1=str.Left(nDes-2);
			CString strName=str1.Right(str1.GetLength()-nName-5);
			strName=strName+".ini";
			//将配置文件写入
			file.Open(strName,CFile::modeCreate|CFile::modeNoTruncate|CFile::modeWrite);
			//file.SeekToEnd();
			file.WriteString(str);
			file.Close();
			rxdatacount=0;


		}
		
		switch(rec[2])
		{
			case 0x02://服务器要求上船信号机的配置
			{
				break;
			}
			case 0x01: //收到信号机传来的配置文件，并保存在本机
			{
				bUploadReady=TRUE;
				break;
			}
		}
	
	
	
	} // end forever loop

}

//
// Write a string to the port
//该函数只能发送字符串
//
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);
}

//********************************************
//添加3个函数  2007-11-13
//1、void CSerialPort::WriteToPort(char* string,int n)
//2、void CSerialPort::WriteToPort(LPCTSTR string)
//3、void CSerialPort::WriteToPort(LPCTSTR string ,int n)
//********************************************
void CSerialPort::WriteToPort(char* string,unsigned long 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(LPCTSTR 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);

}

//
// 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::LoadFile(LPCTSTR lpPathName)
{
	CString sTitle = _T("Ini Demo");
	if (lpPathName != NULL)
		m_ini.SetPathName(lpPathName);
	
	if (!m_ini.GetPathName().IsEmpty())
		sTitle.Format(_T("Ini Demo - [%s]"), m_ini.GetPathName());
	//SetWindowText(sTitle);

	CStdioFile file;
	if (!file.Open(m_ini.GetPathName(), CFile::modeRead))
		return FALSE;

	CString sContents;
	CString sLine;
	while (file.ReadString(sLine))
		sContents += sLine + _T("\r\n");
		//sContents += sLine + L"\r\n";

	file.Close();
	sContents.TrimRight();
	m_cIniFileData=sContents;
	//********************************************
	int n = sContents.GetLength();
	TCHAR* p = sContents.GetBuffer(n);
	char* pp = new char[n+1];
	int j = 0;
	while(n)
	{
	*(pp+j) = (char) *(p+j);
	n--;
	j++;
	}
	*(pp+j) = '\0';
	sContents = pp;

	return TRUE;	
}


*/