serialport.h

利用串口进行通讯

#ifndef __SERIALPORT_H__
#define __SERIALPORT_H__
#define WM_COMM_BREAK_DETECTED		WM_USER+10	// A break was detected on input.
#define WM_COMM_CTS_DETECTED		WM_USER+20	// The CTS (clear-to-send) signal changed state. 
#define WM_COMM_DSR_DETECTED		WM_USER+30	// The DSR (data-set-ready) signal changed state. 
#define WM_COMM_ERR_DETECTED		WM_USER+40	// A line-status error occurred. Line-status errors are CE_FRAME, CE_OVERRUN, and CE_RXPARITY. 
#define WM_COMM_RING_DETECTED		WM_USER+50	// A ring indicator was detected. 
#define WM_COMM_RLSD_DETECTED		WM_USER+60	// The RLSD (receive-line-signal-detect) signal changed state. 
#define WM_COMM_RXCHAR				WM_USER+70	// A character was received and placed in the input buffer. 
#define WM_COMM_RXFLAG_DETECTED		WM_USER+80	// The event character was received and placed in the input buffer.  
#define WM_COMM_TXEMPTY_DETECTED	WM_USER+90	// The last character in the output buffer was sent.  

class CSerialPort
{	
private:
    void	(*evt_func) (void *data, unsigned long length, void *context);
    void	*evt_func_context;
	void writecallback(char *,unsigned long length,void *);
	int writecount;
public:
	// contruction and destruction
	CSerialPort();
	virtual		~CSerialPort();

    void closethread();
	// port initialisation											
	BOOL		InitPort(CWnd* pPortOwner, UINT portnr = 1, UINT baud = 9600, char parity = 'N', UINT databits = 8, UINT stopsbits = 1, DWORD dwCommEvents = EV_RXCHAR | EV_CTS | EV_TXEMPTY, UINT nBufferSize = 700000);

	// start/stop comm watching
	BOOL		StartMonitoring();
	BOOL		RestartMonitoring();
	BOOL		StopMonitoring();

	DWORD		GetWriteBufferSize();
	DWORD		GetCommEvents();
	DCB			GetDCB();


	// thread
//	CWinThread*			m_Thread;
	BOOL				m_bThreadAlive;
    BOOL                m_bStopStates;
	void		WriteToPort(BYTE* string,int length);
	void set_evt_callback (void (*func) (void *, unsigned long, void *), void *context);

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;
	BOOL m_bExit;

	// 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

	//char*				m_szWriteBuffer;
	BYTE*				m_szWriteBuffer;
	DWORD				m_dwCommEvents;
	DWORD				m_nWriteBufferSize;
public:
	void ClosePort();
		UINT			m_nPortNr;
};

#endif __SERIALPORT_H__