Detect when a User takes a Screenshot

Question

I am looking for way for my app to receive a notification when the user takes a screenshot either with Command-Shift-3 or Command-Shift-4.

An e

Answer 1

This was mentioned in one of the earlier comments, but you can use an NSMetadataQuery searching for files where kMDItemIsScreenCapture = 1. This is a special attribute that gets added to screenshot files.

I just whipped up a little demo showing how to do this and posted it on github:

https://github.com/davedelong/Demos/blob/master/ScreenShot%20Detector