diff options
Diffstat (limited to 'IvyFileMon')
| -rw-r--r-- | IvyFileMon/DirectoryChanges.h | 493 |
1 files changed, 493 insertions, 0 deletions
diff --git a/IvyFileMon/DirectoryChanges.h b/IvyFileMon/DirectoryChanges.h new file mode 100644 index 0000000..b2e41c3 --- /dev/null +++ b/IvyFileMon/DirectoryChanges.h @@ -0,0 +1,493 @@ +// DirectoryChanges.h: interface for the
+// CDirectoryChangeWatcher and CDirectoryChangeHandler classes.
+//
+// Uses an io completion port and ReadDirectoryChangesW -- this code will only work on
+// Windows NT/2000/XP.
+//
+// The directory being watched must be a directory on a Windows NT/2000/XP machine
+//
+//
+// These classes are based on the FWatch sample program in the SDK.
+//
+//
+// If you get a compile time error that ReadDirectoryChangesW is an undeclared identifier,
+// you'll need to #define _WIN32_WINNT 0x400 in stdafx.h.
+//
+//
+/*******************************************************************
+// *** COPYRIGHT NOTICE ****
+//
+// Copyright 2001. Wes Jones (wesj@hotmail.com)
+//
+// This code is free for use under the following conditions:
+//
+// You may not claim authorship of this code.
+// You may not sell or distrubute this code without author's permission.
+// You are not permitted to sell this code in it's compiled, non-compiled, executable, or any other form.
+// Executable code excepted in the case that it is not sold separately from an application which
+// uses this it. This means you can use this code for your applications as you see fit, but this code may not be sold in any form
+// to others for use in their applications.
+// This copyright notice may not be removed.
+//
+//
+// If this code was NOT obtained by downloading it from www.codeproject.com,
+// or given to you by a friend or coworker, please tell me, & let me know how you got it. There a plenty of lazy bastards that
+// collect source code from the internet, and then sell it as part of
+// a 'Programmer's Library'. Using this code for such a purpose is stricly prohibited.
+//
+// If you'd like to pay me to turn this into an ActiveX/COM object so you
+// can use it in a Visual Basic application, feel free to contact me with an offer,
+// and I will create it for you. Otherwise, here is the source code, and you may make your own
+// ActiveX/COM object, providing that it is not sold separately.
+//
+// No guarantees or warranties are expressed or implied.
+// This code may contain bugs.
+// Warning: May contain matter. If this should come into contact with anti-matter, a violent explosion may occur.
+*******************************************************************/
+
+// Please let me know of any bugs, bug fixes, or enhancements made to this code.
+// If you have ideas for this, and/or tips or admonitions, I would be glad to hear them.
+//
+// See notes at top of DirectoryChanges.cpp modification history and more info.
+//
+//
+//////////////////////////////////////////////////////////////////////
+
+#if !defined(AFX_DIRECTORYCHANGES_H__02E53FDE_CB22_4176_B6D7_DA3675D9F1A6__INCLUDED_)
+#define AFX_DIRECTORYCHANGES_H__02E53FDE_CB22_4176_B6D7_DA3675D9F1A6__INCLUDED_
+
+#if _MSC_VER > 1000
+#pragma once
+#endif // _MSC_VER > 1000
+
+#include <afxmt.h>
+#include <afxtempl.h>
+
+#define READ_DIR_CHANGE_BUFFER_SIZE 4096
+
+class CFileNotifyInformation;//helper class
+class CDirectoryChangeWatcher;
+class CDelayedDirectoryChangeHandler;//helper class...used in implementation
+
+class CDirectoryChangeHandler
+/***********************************
+ A class to handle changes to files in a directory.
+ The virtual On_Filexxx() functions are called whenever changes are made to a watched directory that is being handled by this object...
+ The On_Filexxx() functions execute in the context of the main thread if true is passed to the constructor of CDirectoryChangeWatcher,
+ OR they fire in the context of a worker thread if false is passed to the constructor of CDirectoryChangeWatcher
+
+ NOTES:
+ A CDirectoryChangeHandler can only be used by ONE CDirectoryChangeWatcher object,
+ but a CDirectoryChangeWatcher object may use multiple CDirectoryChangeHandler objects.
+
+ When this object is destroyed, whatever directories that it was being used to handle directory changes for
+ will automatically be 'unwatched'.
+
+ The class is reference counted. The reference count is increased every time it is used
+ in a (successfull) call to CDirectoryChangeWatcher::WatchDirectory() and is decremented whenever
+ the directory becomes 'unwatched'.
+
+ The only notifications are File Added, Removed, Modified, and Renamed.
+ Even though the CDirectoryChangeWatcher::WatchDirectory (which'll call ReadDirectoryChangesW()) function allows you to specify flags
+ to watch for changes to last access time, last write time, attributes changed, etc,
+ these changes all map out to On_FileModified() which doesn't specify the type of modification.
+
+
+ NOTE: The CDirectoryChangeHandler::On_Filexxx() functions
+ are called in the context of the main thread, the thread that called CDirectoryChangeWatcher::WatchDirectory(),
+ if you pass true to the constructor of CDirectoryChangeWatcher. This is accomplished via a hidden window,
+ and REQUIRES that your app has a message pump.
+ For console applications, or applications w/out a message pump, you can pass false to the constructor
+ of CDirectoryChangeWatcher, and these notifications will fire in the context of a worker thread. By passing false
+ to the constructor of CDirectoryChangeWatcher, you do NOT NEED a message pump in your application.
+
+
+
+************************************/
+{
+public:
+
+ CDirectoryChangeHandler();
+ virtual ~CDirectoryChangeHandler();
+
+ //this class is reference counted
+ long AddRef();
+ long Release();
+ long CurRefCnt()const;
+
+
+ BOOL UnwatchDirectory();//causes CDirectoryChangeWatcher::UnwatchDirectory() to be called.
+
+ const CString & GetChangedDirectoryName() const { return m_strChangedDirectoryName;}//WARNING: don't use this, this function will be removed in a future release.
+ //returns the directory name where the change occured. This contains
+ //the last directory to have changed if the same CDirectoryChangeHandler is
+ //being used to watch multiple directories. It will return an empty string
+ //if no changes have been made to a directory yet. It will always be the
+ //name of the currently changed directory(as specified in CDirectoryChangeWatcher::WatchDirectory())
+ //if called in the context of one of the
+ //On_Filexxx() functions.
+protected:
+ //
+ // Override these functions:
+ // These functions are called when the directory to watch has had a change made to it
+ virtual void On_FileAdded(const CString & strFileName); //=0;
+ //
+ // On_FileAdded()
+ //
+ // This function is called when a file in one of the watched folders(or subfolders)
+ // has been created.
+ //
+ // For this function to execute you'll need to specify FILE_NOTIFY_CHANGE_FILE_NAME or FILE_NOTIFY_CHANGE_DIR_NAME(for directories)
+ // when you call CDirectoryChangeWatcher::WatchDirectory()
+ //
+ virtual void On_FileRemoved(const CString & strFileName);// = 0;
+ //
+ // On_FileRemoved()
+ //
+ // This function is called when a file in one of the watched folders(or subfolders)
+ // has been deleted(or moved to another directory)
+ //
+ // For this function to execute you'll need to specify FILE_NOTIFY_CHANGE_FILE_NAME or FILE_NOTIFY_CHANGE_DIR_NAME(for directories)
+ // when you call CDirectoryChangeWatcher::WatchDirecotry()
+ //
+
+ virtual void On_FileNameChanged(const CString & strOldFileName, const CString & strNewFileName);// = 0;
+ //
+ // On_FileNameChanged()
+ //
+ // This function is called when a file in one of the watched folders(or subfolders)
+ // has been renamed.
+ //
+ //
+ // You'll need to specify FILE_NOTIFY_CHANGE_FILE_NAME (or FILE_NOTIFY_CHANGE_DIR_NAME(for directories))
+ // when you call CDirectoryChangeWatcher::WatchDirectory()
+ //
+ //
+
+ virtual void On_FileModified(const CString & strFileName);// = 0;
+ //
+ // On_FileModified()
+ //
+ // This function is called whenever an attribute specified by the watch
+ // filter has changed on a file in the watched directory or
+ //
+ // Specify any of the following flags when you call CDirectoryChangeWatcher::WatchDirectory()
+ //
+ //
+ // FILE_NOTIFY_CHANGE_ATTRIBUTES
+ // FILE_NOTIFY_CHANGE_SIZE
+ // FILE_NOTIFY_CHANGE_LAST_WRITE
+ // FILE_NOTIFY_CHANGE_LAST_ACCESS
+ // FILE_NOTIFY_CHANGE_CREATION (* See Note # 1* )
+ // FILE_NOTIFY_CHANGE_SECURITY
+ //
+ //
+ // General Note) Windows tries to optimize some of these notifications. You may not get
+ // a notification every single time a file is accessed for example.
+ // There's a MS KB article or something on this(sorry forgot which one).
+ //
+ // Note #1 ) This notification isn't what you might think(FILE_NOTIFY_CHANGE_CREATION).
+ // See the help files for ReadDirectoryChangesW...
+ // This notifies you of a change to the file's
+ // creation time, not when the file is created.
+ // Use FILE_NOTIFY_CHANGE_FILE_NAME to know about newly created files.
+ //
+
+ virtual void On_ReadDirectoryChangesError(DWORD dwError, const CString & strDirectoryName);
+ //
+ // On_ReadDirectoryChangesError()
+ //
+ // This function is called when ReadDirectoryChangesW() fails during normal
+ // operation (ie: some time after you've called CDirectoryChangeWatcher::WatchDirectory())
+ //
+ //
+ // NOTE: *** READ THIS *** READ THIS *** READ THIS *** READ THIS ***
+ //
+ // NOTE: If this function has been called, the watched directory has been automatically unwatched.
+ // You will not receive any further notifications for that directory until
+ // you call CDirectoryChangeWatcher::WatchDirectory() again.
+ //
+ // On_WatchStopped() will not be called.
+
+
+ virtual void On_WatchStarted(DWORD dwError, const CString & strDirectoryName);
+ //
+ // void On_WatchStarted()
+ //
+ // This function is called when a directory watch has begun.
+ // It will be called whether CDirectoryChangeWatcher::WatchDirectory() is successful or not. Check the dwError parameter.
+ //
+ // PARAMETERS:
+ // DWORD dwError -- 0 if successful, else it's the return value of GetLastError()
+ // indicating why the watch failed.
+ // const CString & strDirectoryName -- The full path and name of the directory being watched.
+
+ virtual void On_WatchStopped(const CString & strDirectoryName);
+ //
+ // void On_WatchStopped()
+ //
+ // This function is called when a directory is unwatched (except on the case of the direcotry being unwatched due to an error)
+ //
+ // WARNING: *** READ THIS *** READ THIS *** READ THIS *** READ THIS ***
+ //
+ // This function MAY be called before the destructor of CDirectoryChangeWatcher
+ // finishes.
+ //
+ // Be careful if your implementation of this fuction
+ // interacts with some sort of a window handle or other object(a class, a file, etc.).
+ // It's possible that that object/window handle will NOT be valid anymore the very last time
+ // that On_WatchStopped() is called.
+ // This scenario is likely if the CDirectoryChangeWatcher instance is currently watching a
+ // directory, and it's destructor is called some time AFTER these objects/windows
+ // your change handler interacts with have been destroyed.
+ //
+ // If your CDirectoryChangeHandler derived class interacts w/ a window or other
+ // object, it's a good idea to unwatch any directories before the object/window is destroyed.
+ // Otherwise, place tests for valid objects/windows in the implementation of this function.
+ //
+ // Failure to follow either tip can result in a mysterious RTFM error, or a 'Run time errors'
+ //
+
+ virtual bool On_FilterNotification(DWORD dwNotifyAction, LPCTSTR szFileName, LPCTSTR szNewFileName);
+ //
+ // bool On_FilterNotification(DWORD dwNotifyAction, LPCTSTR szFileName, LPCTSTR szNewFileName);
+ //
+ // This function gives your class a chance to filter unwanted notifications.
+ //
+ // PARAMETERS:
+ // DWORD dwNotifyAction -- specifies the event to filter
+ // LPCTSTR szFileName -- specifies the name of the file for the event.
+ // LPCTSTR szNewFileName -- specifies the new file name of a file that has been renamed.
+ //
+ // ** szFileName and szNewFileName will always be the full path and file name with extention.
+ //
+ // RETURN VALUE:
+ // return true , and you will receive the notification.
+ // return false, and your class will NOT receive the notification.
+ //
+ // Valid values of dwNotifyAction:
+ // FILE_ACTION_ADDED -- On_FileAdded() is about to be called.
+ // FILE_ACTION_REMOVED -- On_FileRemoved() is about to be called.
+ // FILE_ACTION_MODIFIED -- On_FileModified() is about to be called.
+ // FILE_ACTION_RENAMED_OLD_NAME-- On_FileNameChanged() is about to be call.
+ //
+ //
+ // NOTE: When the value of dwNotifyAction is FILE_ACTION_RENAMED_OLD_NAME,
+ // szFileName will be the old name of the file, and szNewFileName will
+ // be the new name of the renamed file.
+ //
+ // The default implementation always returns true, indicating that all notifications will
+ // be sent.
+ //
+ // NOTE: This function may or may not be called depending upon the flags you specify to control
+ // filter behavior.
+ // If you are specifying filters when watching the directory, you will not get this notification
+ // if the file name does not pass the filter test, even if this function returns true.
+ //
+
+ //
+ //
+ // End Override these functions (ie: don't worry about the rest of this class)
+ //
+
+ void SetChangedDirectoryName(const CString & strChangedDirName);//please don't use this function, it will be removed in future releases.
+
+private:
+ long m_nRefCnt;
+
+ CString m_strChangedDirectoryName;//will be removed in a future release.
+
+ friend class CDirectoryChangeWatcher;
+ friend class CDelayedDirectoryChangeHandler;
+ //
+ // This class keeps a reference to the CDirectoryChangeHandler
+ // that was used when an object of this type is passed
+ // to CDirectoryChangeWatcher::WatchDirectory().
+ //
+ // This way, when the CDirectoryChangeWatcher object is destroyed(or if CDirectoryChangeHandler::UnwatchDirectory() is called)
+ // AFTER CDirectoryChangeWatcher::UnwatchDirecotry() or CDirectoryChangeWatcher::UnwatchAllDirectories() is called
+ // the directory(or direcotries) that this
+ // CDirectoryChangeWatcher object is handling will be automatically unwatched
+ // If the CDirectoryChangeWatcher object is destroyed before the CDirectoryChangeHandler objects
+ // that are being used with that watcher are destroyed, the reference counting prevents
+ // this class from referencing a destructed object.
+ // Basically, neither class needs to worry about the lifetime of the other(CDirectoryChangeWatcher && CDirectoryChangeHandler)
+ //
+
+ long ReferencesWatcher(CDirectoryChangeWatcher * pDirChangeWatcher);
+ long ReleaseReferenceToWatcher(CDirectoryChangeWatcher * pDirChangeWatcher);
+ CDirectoryChangeWatcher * m_pDirChangeWatcher;
+ long m_nWatcherRefCnt; //<-- when this reaches 0, m_pDirChangeWatcher is set to NULL
+ CCriticalSection m_csWatcher;
+};
+
+///////////////////////////////////////////////////////////
+
+class CDirectoryChangeWatcher
+/***************************************
+ A class to monitor a directory for changes made to files in it, or it's subfolders.
+ The class CDirectoryChangeHandler handles the changes. You derive a class from CDirectoryChangeHandler to handle them.
+
+
+ This class uses the Win32 API ReadDirectoryChangesW() to watch a directory for file changes.
+
+ Multiple directories can be watched simultaneously using a single instance of CDirectoryChangeWatcher.
+ Single or multiple instances of CDirectoryChangeHandler object(s) can be used to handle changes to watched directories.
+ Directories can be added and removed from the watch dynamically at run time without destroying
+ the CDirectoryChangeWatcher object (or CDirectoryChangeHandler object(s).
+
+ This class uses a worker thread, an io completion port, and ReadDirectoryChangesW() to monitor changes to a direcory (or subdirectories).
+ There will always only be a single thread no matter how many directories are being watched(per instance of CDirectoryChangeHandler)
+
+ THREAD ISSUES:
+ This class uses worker threads.
+ Notifications (calling CDirectoryChangeHandler's virtual functions) are executed
+ in the context of either the main thread, OR in a worker thread.
+
+ The 'main' thread is the thread that first calls CDirectoryChangeWatcher::WatchDirectory().
+ For notifications to execute in the main thread, it's required that the calling thread(usually the main thread)
+ has a message pump in order to process the notifications.
+
+ For applications w/out a message pump, notifications are executed in the context of a worker thread.
+
+ See the constructor for CDirectoryChangeWatcher.
+
+
+****************************************/
+{
+public:
+
+ enum { //options for determining the behavior of the filter tests.
+ //
+ FILTERS_DONT_USE_FILTERS = 1, //never test the include/exclude filters. CDirectoryChangeHandler::On_FilterNotification() is still called.
+ FILTERS_CHECK_FULL_PATH = 2, //For the file path: "C:\FolderName\SubFolder\FileName.xyz", the entire path is checked for the filter pattern.
+ FILTERS_CHECK_PARTIAL_PATH = 4, //For the file path: "C:\FolderName\SubFolder\FileName.xyz", only "SubFolder\FileName.xyz" is checked against the filter pattern, provided that you are watching the folder "C:\FolderName", and you are also watching subfolders.
+ FILTERS_CHECK_FILE_NAME_ONLY = 8, //For the file path: "C:\FolderName\SubFolder\FileName.xyz", only "FileName.xyz" is checked against the filter pattern.
+ FILTERS_TEST_HANDLER_FIRST = 16, //test CDirectoryChangeHandler::On_FilterNotification() before checking the include/exclude filters. the default is to check the include/exclude filters first.
+ FILTERS_DONT_USE_HANDLER_FILTER = 32, //CDirectoryChangeHander::On_FilterNotification() won't be called.
+ FILTERS_NO_WATCHSTART_NOTIFICATION = 64,//CDirectoryChangeHander::On_WatchStarted() won't be called.
+ FILTERS_NO_WATCHSTOP_NOTIFICATION = 128,//CDirectoryChangeHander::On_WatchStopped() won't be called.
+ FILTERS_DEFAULT_BEHAVIOR = (FILTERS_CHECK_FILE_NAME_ONLY ),
+ FILTERS_DONT_USE_ANY_FILTER_TESTS = (FILTERS_DONT_USE_FILTERS | FILTERS_DONT_USE_HANDLER_FILTER),
+ FILTERS_NO_WATCH_STARTSTOP_NOTIFICATION = (FILTERS_NO_WATCHSTART_NOTIFICATION | FILTERS_NO_WATCHSTOP_NOTIFICATION)
+ };
+
+ //ctor/dtor
+ CDirectoryChangeWatcher(bool bAppHasGUI = true, DWORD dwFilterFlags = FILTERS_DEFAULT_BEHAVIOR);//see comments in ctor .cpp file.
+ virtual ~CDirectoryChangeWatcher();
+
+ //
+ // Starts a watch on a directory:
+ //
+ DWORD WatchDirectory(const CString & strDirToWatch,
+ DWORD dwChangesToWatchFor,
+ CDirectoryChangeHandler * pChangeHandler,
+ BOOL bWatchSubDirs = FALSE,
+ LPCTSTR szIncludeFilter = NULL,
+ LPCTSTR szExcludeFilter = NULL);
+
+ BOOL IsWatchingDirectory (const CString & strDirName)const;
+ int NumWatchedDirectories()const; //counts # of directories being watched.
+
+
+ BOOL UnwatchDirectory(const CString & strDirToStopWatching);//stops watching specified directory.
+ BOOL UnwatchAllDirectories();//stops watching ALL watched directories.
+
+ DWORD SetFilterFlags(DWORD dwFilterFlags);//sets filter behavior for directories watched AFTER this function has been called.
+ DWORD GetFilterFlags()const{return m_dwFilterFlags;}
+
+protected:
+
+ virtual void On_ThreadInitialize(){}//All file change notifications has taken place in the context of a worker thread...do any thread initialization here..
+ virtual void On_ThreadExit(){}//do thread cleanup here
+
+private:
+ friend class CDirectoryChangeHandler;
+ BOOL UnwatchDirectory(CDirectoryChangeHandler * pChangeHandler);//called in CDirectoryChangeHandler::~CDirectoryChangeHandler()
+
+
+ UINT static MonitorDirectoryChanges(LPVOID lpvThis );//the worker thread that monitors directories.
+
+ class CDirWatchInfo
+ //this class is used internally by CDirectoryChangeWatcher
+ //to help manage the watched directories
+ {
+ private:
+ CDirWatchInfo(); //private & not implemented
+ CDirWatchInfo & operator=(const CDirWatchInfo & rhs);//so that they're aren't accidentally used. -- you'll get a linker error
+ public:
+ CDirWatchInfo(HANDLE hDir, const CString & strDirectoryName,
+ CDirectoryChangeHandler * pChangeHandler,
+ DWORD dwChangeFilter, BOOL bWatchSubDir,
+ bool bAppHasGUI,
+ LPCTSTR szIncludeFilter,
+ LPCTSTR szExcludeFilter,
+ DWORD dwFilterFlags);
+ private:
+ ~CDirWatchInfo( );//only I can delete myself....use DeleteSelf()
+ public:
+ void DeleteSelf(CDirectoryChangeWatcher * pWatcher);
+
+ DWORD StartMonitor(HANDLE hCompPort);
+ BOOL UnwatchDirectory( HANDLE hCompPort );
+ protected:
+ BOOL SignalShutdown( HANDLE hCompPort );
+ BOOL WaitForShutdown();
+ public:
+ BOOL LockProperties() { return m_cs.Lock(); }
+ BOOL UnlockProperties(){ return m_cs.Unlock(); }
+
+ CDelayedDirectoryChangeHandler* GetChangeHandler() const;
+ CDirectoryChangeHandler * GetRealChangeHandler() const;//the 'real' change handler is your CDirectoryChangeHandler derived class.
+ CDirectoryChangeHandler * SetRealDirectoryChangeHandler(CDirectoryChangeHandler * pChangeHandler);
+
+ BOOL CloseDirectoryHandle();
+
+ //CDirectoryChangeHandler * m_pChangeHandler;
+ CDelayedDirectoryChangeHandler * m_pChangeHandler;
+ HANDLE m_hDir;//handle to directory that we're watching
+ DWORD m_dwChangeFilter;
+ BOOL m_bWatchSubDir;
+ CString m_strDirName;//name of the directory that we're watching
+ CHAR m_Buffer[ READ_DIR_CHANGE_BUFFER_SIZE ];//buffer for ReadDirectoryChangesW
+ DWORD m_dwBufLength;//length or returned data from ReadDirectoryChangesW -- ignored?...
+ OVERLAPPED m_Overlapped;
+ DWORD m_dwReadDirError;//indicates the success of the call to ReadDirectoryChanges()
+ CCriticalSection m_cs;
+ CEvent m_StartStopEvent;
+ enum eRunningState{
+ RUNNING_STATE_NOT_SET, RUNNING_STATE_START_MONITORING, RUNNING_STATE_STOP, RUNNING_STATE_STOP_STEP2,
+ RUNNING_STATE_STOPPED, RUNNING_STATE_NORMAL
+ };
+ eRunningState m_RunningState;
+ };//end nested class CDirWatchInfo
+
+ void ProcessChangeNotifications(IN CFileNotifyInformation & notify_info,
+ IN CDirWatchInfo * pdi,
+ OUT DWORD & ref_dwReadBuffer_Offset);
+ friend class CDirWatchInfo;//so that CDirWatchInfo can call the following function.
+ long ReleaseReferenceToWatcher(CDirectoryChangeHandler * pChangeHandler);
+
+ BOOL UnwatchDirectoryBecauseOfError(CDirWatchInfo * pWatchInfo);//called in case of error.
+ int AddToWatchInfo(CDirWatchInfo * pWatchInfo);
+ //
+ // functions for retrieving the directory watch info based on different parameters
+ //
+ CDirWatchInfo * GetDirWatchInfo(IN const CString & strDirName, OUT int & ref_nIdx)const;
+ CDirWatchInfo * GetDirWatchInfo(IN CDirWatchInfo * pWatchInfo, OUT int & ref_nIdx)const;
+ CDirWatchInfo * GetDirWatchInfo(IN CDirectoryChangeHandler * pChangeHandler, OUT int & ref_nIdx)const;
+
+
+ HANDLE m_hCompPort; //i/o completion port
+ HANDLE m_hThread; //MonitorDirectoryChanges() thread handle
+ DWORD m_dwThreadID;
+ CTypedPtrArray<CPtrArray, CDirWatchInfo*> m_DirectoriesToWatch; //holds info about the directories that we're watching.
+ CCriticalSection m_csDirWatchInfo;
+
+ bool m_bAppHasGUI; //dispatch to main thread, or a worker thread?
+ DWORD m_dwFilterFlags;//options for determining the behavior of the filter tests.
+
+};
+
+
+#endif // !defined(AFX_DIRECTORYCHANGES_H__02E53FDE_CB22_4176_B6D7_DA3675D9F1A6__INCLUDED_)
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