Author image Gurusamy Sarathy


Win32::ChangeNotify - Monitor events related to files and directories


        require Win32::ChangeNotify;

        $notify = Win32::ChangeNotify->new($Path,$WatchSubTree,$Events);
        $notify->wait or warn "Something failed: $!\n";
        # There has been a change.


This module allows the user to use a Win32 change notification event object from Perl. This allows the Perl program to monitor events relating to files and directory trees.

The wait method and wait_all & wait_any functions are inherited from the "Win32::IPC" module.


$notify = Win32::ChangeNotify->new($path, $subtree, $filter)

Constructor for a new ChangeNotification object. $path is the directory to monitor. If $subtree is true, then all directories under $path will be monitored. $filter indicates what events should trigger a notification. It should be a string containing any of the following flags (separated by whitespace and/or |).

   ATTRIBUTES   Any attribute change
   DIR_NAME     Any directory name change
   FILE_NAME    Any file name change (creating/deleting/renaming)
   LAST_WRITE   Any change to a file's last write time
   SECURITY     Any security descriptor change
   SIZE         Any change in a file's size

($filter can also be an integer composed from the FILE_NOTIFY_CHANGE_* constants.)


Shut down monitoring. You could just undef $notify instead (but close works even if there are other copies of the object). This happens automatically when your program exits.


Resets the ChangeNotification object after a change has been detected. The object will become signalled again after the next change. (It is OK to call this immediately after new, but it is not required.)


See "Win32::IPC". Remember to call reset afterwards if you want to continue monitoring.

Deprecated Functions and Methods

Win32::ChangeNotify still supports the ActiveWare syntax, but its use is deprecated.



  $Obj = Win32::ChangeNotify->new($PathName,$WatchSubTree,$Filter)



Use $obj->reset instead.


Use $obj->close instead.


Christopher J. Madsen <>

Loosely based on the original module by ActiveWare Internet Corp.,