Drawing on Another App's CGDisplayCapture
Drawing on Another App's CGDisplayCapture
- Subject: Drawing on Another App's CGDisplayCapture
- From: Ben H Kram <email@hidden>
- Date: Thu, 22 Mar 2007 12:15:33 -0400
Folks,
My group films lectures for Distance Education.
I wrote a little app that monitors Keynote and writes a timestamp to a file for every slide viewed.
This is a great aid to our producers when they time sync the presentation to video.
The videographers really would like some indication that this is running when they see the first couple of slides from behind the camera.
I was hoping to create a cue-mark superimposed on an upper corner of the screen to show this.
I am assuming that Keynote uses CGDisplayCapture() to grab the display. If I try to do the same when Keynote is in presentation mode, I get a kCGErrorNoneAvailable, which I would expect.
Is there any way to write on another app's CGDisplayCaptured screen? Perhaps at a lower level in the API?
Thanks,
Ben
--
Benjamin Kram
email@hidden
617.998.8592
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