Get notified when something is added to NSPasteboard

Question

In my application I want to get notified if something is added into the NSPasteboard. If I copy an text from any other program I want my application to know about it.

Somewhere I read it can't be done that way. I should create a timer and check the content of the NSPasteboard myself.

Is this the way to do? Or are there any kind of notifications?

Answer 1

Yes, you essentially have to poll the pasteboard to see if its contents have changed. It's not ideal, but it's possible. Basically, you have a timer that fires once or twice a second and checks the -[NSPasteboard changeCount]. If the changeCount changes, that means the contents of the pasteboard have also changed (or there's at least a new owner).