If I CFRelease() an image in core data, how do I get it back?

Question

My iphone app plays a slide show made up of 5 user images.  These images are stored using core data.  I was noticing that memory was building up every time a different slide show was played and it was not releasing any of the previously played slide shows.   These images are showing up in Object Allocations as CFData. So I tried releasing this data in the dealloc method

CFRelease(slideshow.image1);
CFRelease(slideshow.image2);
CFRelease(slideshow.image3);
CFRelease(slideshow.image4);
CFRelease(slideshow.image5);

This releases the previous slideshow great...BUT when I go back to view that same slideshow again, it crashes.   I am guessing that I need to alloc/init these images again, but I am not sure how?  Or maybe I should be managing this memory in a different way?

Answer 1

It sounds like you're CFRelease-ing data that you shouldn't, and since you're mucking around with the NSManagedObject, you inevitably get a crash when Core Data goes "WTF?"

By "it was not releasing" are you seeing a memory leak, or simple memory usage growth? If the former, then we'll need more information, especially if Core Data is leaking, you might need to file a bug report (which is unlikely). If the latter, then there's much you can do, since Core Data is in charge of its own memory management.

It's possible you could use a NSAutoreleasePool to optimize but I can't say more on that.