www.pudn.com > 200518174534292.rar > SerialPort.h

/* 
**	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 
** 
** 
*/ 
 
#ifndef __SERIALPORT_H__ 
#define __SERIALPORT_H__ 
 
#define WM_COMM_BREAK_DETECTED		WM_USER+1	// A break was detected on input. 
#define WM_COMM_CTS_DETECTED		WM_USER+2	// The CTS (clear-to-send) signal changed state.  
#define WM_COMM_DSR_DETECTED		WM_USER+3	// The DSR (data-set-ready) signal changed state.  
#define WM_COMM_ERR_DETECTED		WM_USER+4	// A line-status error occurred. Line-status errors are CE_FRAME, CE_OVERRUN, and CE_RXPARITY.  
#define WM_COMM_RING_DETECTED		WM_USER+5	// A ring indicator was detected.  
#define WM_COMM_RLSD_DETECTED		WM_USER+6	// The RLSD (receive-line-signal-detect) signal changed state.  
#define WM_COMM_RXCHAR				WM_USER+7	// A character was received and placed in the input buffer.  
#define WM_COMM_RXFLAG_DETECTED		WM_USER+8	// The event character was received and placed in the input buffer.   
#define WM_COMM_TXEMPTY_DETECTED	WM_USER+9	// The last character in the output buffer was sent.   
 
class CSerialPort 
{														  
public: 
	BOOL ClearRXBuffer(); 
	// contruction and destruction 
	CSerialPort(); 
	virtual		~CSerialPort(); 
 
	// port initialisation											 
	BOOL		InitPort(CWnd* pPortOwner, UINT portnr = 3, UINT baud = 1200, char parity = 'E', UINT databits = 8, UINT stopsbits = 1, DWORD dwCommEvents = EV_RXCHAR | EV_CTS, UINT nBufferSize = 512); 
 
	// start/stop comm watching 
	BOOL		StartMonitoring(); 
	BOOL		RestartMonitoring(); 
	BOOL		StopMonitoring(); 
 
	DWORD		GetWriteBufferSize(); 
	DWORD		GetCommEvents(); 
	DCB			GetDCB(); 
 
	void		WriteToPort(char* string); 
 
protected: 
	// protected memberfunctions 
	void		ProcessErrorMessage(char* ErrorText); 
	static UINT	CommThread(LPVOID pParam); 
	static void	ReceiveChar(CSerialPort* port, COMSTAT comstat); 
	static void	WriteChar(CSerialPort* port); 
 
	// thread 
	CWinThread*			m_Thread; 
 
	// synchronisation objects 
	CRITICAL_SECTION	m_csCommunicationSync; 
	BOOL				m_bThreadAlive; 
 
	// handles 
	HANDLE				m_hShutdownEvent; 
	HANDLE				m_hComm; 
	HANDLE				m_hWriteEvent; 
 
	// 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; 
 
	// misc 
	UINT				m_nPortNr; 
	char*				m_szWriteBuffer; 
	DWORD				m_dwCommEvents; 
	DWORD				m_nWriteBufferSize; 
}; 
 
#endif __SERIALPORT_H__