Notification Functions
An application can monitor the contents of a directory and its subdirectories
by using the
FindFirstChangeNotification,
FindNextChangeNotification, and
FindCloseChangeNotification functions. Waiting for a change notification is similar to having a read
operation pending against a directory and, if necessary, its subdirectories. When
something changes within the directory being watched, the read operation is
completed. For example, an application can use these functions to update a
directory listing whenever a filename within the monitored directory changes.
An application can specify a set of conditions that trigger a change
notification by using the
FindFirstChangeNotification function. The conditions include changes to filenames, directory names,
attributes, file size, time of last write, and security. This function also returns
a handle that can be waited on by using the
wait functions. If the wait condition is satisfied,
FindNextChangeNotification can be used to provide a notification handle to wait on subsequent changes.
The
FindCloseChangeNotification function closes the notification handle.
Another way to monitor directory changes is by using the
ReadDirectoryChangesW function.
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