Have you considered using a dispatch source?

You might have to do some manual checking when you get a notification about 
activity with your file, but it might be suitable to your needs.

Here's a link I was reading:

http://stackoverflow.com/questions/11355144/file-monitoring-using-grand-central-dispatch

Sandor Szatmari

> On Aug 10, 2016, at 15:30, Jens Alfke <[email protected]> wrote:
> 
> 
>> On Aug 10, 2016, at 12:10 PM, Gurkan Erdogdu <[email protected]> wrote:
>> 
>> I try to get file close notification in Cocoa/Swift. Is there any way to do 
>> this? I tried to use FSEvent API but this does not provide any notification 
>> for file close events.
> 
> I don’t think there’s any such notification. File handles are private to a 
> process.
> 
>> Any help is appreciated. What I want to do is when word or PDF file is 
>> closed, I want my Cocoa application do sometnig?
> 
> If you want to do something when the file is changed, then watch for 
> file-changed events. You’ll probably want to wait a few seconds after the 
> last such event, because you may get several in a row if the changes take a 
> while (for example if a file is being downloaded.)
> 
> If you want to do something when a _document_ is closed in an app like 
> Preview or Word, that’s entirely different. Closing a document has nothing to 
> do with closing a file. When most apps open a document they open the file, 
> read its contents, and then close the file. They don’t leave it open while 
> the document is open. As far as I know there is no reliable way to detect 
> when some other app closes a document.
> 
> —Jens
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