ngfilechangemonitor.h

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////////////////////////////////////////////////////////////////
// CNGFileChangeMonitor Copyright 1999 by Anna-Jayne Metcalfe ([e-mail])
//

// NGFileChangeMonitor.h : header file
//

#ifndef __NGFileChangeMonitor_H__
#define __NGFileChangeMonitor_H__



/////////////////////////////////////////////////////////////////////////////
// CNGFileChangeMonitor class

class NGLIB_EXT_CLASS CNGFileChangeMonitor : public CObject
{
// Construction
public:
			CNGFileChangeMonitor(void);

	virtual	~CNGFileChangeMonitor(void);

	// Attributes
public:

// Operations
public:
			// Start monitoring a file for changes
			// When the file is changed a message is sent to the
			// specified window
			BOOL					Start(	const CString& sPathName,	// File or directory
											CWnd* pWnd,					// Window
											UINT nMsg,					// Message to send
											UINT nID = 0,				// ID if message is WM_COMMAND
											int ePriority = THREAD_PRIORITY_BELOW_NORMAL);
																		// Priority

			BOOL					Start(	const CString& sPathName,	// File or directory
											HWND hWnd,					// Window
											UINT nMsg,					// Message to send
											UINT nID = 0,				// ID if message is WM_COMMAND
											int ePriority = THREAD_PRIORITY_BELOW_NORMAL);

			// Stop monitoring the current file
			BOOL					Stop(void);

			CString					GetMonitoredPathname(void) const
										{ return m_sMonitoredPath; };

			BOOL					IsMonitoring(void) const
										{ return !m_sMonitoredPath.IsEmpty(); };



// Implementation
protected:
			CEvent					m_Event;			// Event used to signal thread to exit
			CWinThread*				m_pThread;			// Pointer to worker thread monitoring file
			HANDLE					m_hThread;			// Thread handle obtained from m_pThread
			CString					m_sMonitoredPath;	// Directory or file being monitored

			// Create worker thread. Called by StartMonitor()
			void					CreateMonitoringThread(	const CString& sPathName,
															HWND hWnd,
															UINT nMsg,
															UINT nID,
															int ePriority);
			
			// Terminate worker thread. Called by StopMonitor()
			void					DestroyMonitoringThread(void);

			// Main function for worker thread. Called when the thread is created
	static	UINT					ThreadFunc(LPVOID pParam);
			UINT					DoThreadFunc(LPVOID pParam);

			// Called when a notification should be made
	virtual	BOOL					OnFileChange(const CString& sPath, HWND hWnd, UINT nMsg, UINT nID);

};


/////////////////////////////////////////////////////////////////////////////
#endif //!__NGFileChangeMonitor_H__