tapping into finder events

[Thierry]

Hi,

and even a bit more..... introduced in DARWIN !!!!

Regards,
Thierry
========
FSEvents API

Introduced in Mac OS X v10.5, the FSEvents API notifies your  
application when changes occur in the file system. You can use file  
system events to monitor directories for any changes, such as the  
creation, modification, or removal of contained files and  
directories. Although kqueues provide similar behavior, the FSEvents  
API provides a much simpler way to monitor many directories at once.  
For example, you can use file system events to monitor entire file  
system hierarchies rooted at a specific directory and still receive  
notifications about individual directories in the hierarchy. The  
implementation of file system events is lightweight and efficient,  
providing built-in coalescing when multiple changes occur within a  
short period of time to one or many directories.

The FSEvents API is not intended for detecting fine-grained changes  
to individual files. You would not use this to detect changes to an  
individual file as in a virus checker program. Instead, you might use  
FSEvents to detect general changes to a file hierarchy. For example,  
you might use this technology in backup software to detect what files  
changed. You might also use it to monitor a set of data files your  
application uses, but which can be modified by other applications as  
well......



> Recently, Randall Lee Reetz wrote:
>
>> The suggestions posted to my questions have all required polling,  
>> which is
>> peridic comparison of what was with what is now.  This is scary  
>> inefficient
>> compared with getting delta messages as they occure.
>
> Not sure if you've already come across this, but it *looks* like the
> underlying principles may be what you're after (for OS X only):
>
> "... the FSEvents API. This API provides a mechanism to notify  
> clients about
> directories they ought to re-scan in order to keep their internal data
> structures up-to-date with respect to the true state of the file  
> system.
> (For example, when files or directories are created, modified, or  
> removed.)
> It sends these notifications "in bulk", possibly notifying the  
> client of
> changes to several directories in a single callback. By using the API,
> clients can notice such changes quickly, without needing to resort to
> recursive polling/scanning of the file system."
>
> http://developer.apple.com/documentation/Darwin/Reference/ 
> FSEvents_Ref/FSEve
> nts/index.html
>
> Regards,
>
> Scott Rossi
> Creative Director
> Tactile Media, Multimedia & Design