Question

I have a file path to a specific file and I want to register to be notified whenever that file changes (its contents have been modified).

I have tried searching google and I can’t find a clear answer. I have experimented with kqueue and NSWorkspace but have not had much success.

What is the proper way to do this?

Thanks!

Answer 1

I am using VDKQueue right now – author says it’s a refactored and more performant version of UKKQueue.

Implementation was pretty straightforward:

• let your controller be the VDKQueueDelegate;
• declare a VDKQueue* ivar / property;
• setup delegate method VDKQueue:receivedNotification:forPath:;
• init the queue and set its delegate to the controller itself;
• add resources to watch with addPath:notifyingAbout:.

Then just do your business in the delegate method.