On 2011 Aug 04, at 07:53, Ken Thomases wrote: > On Aug 4, 2011, at 8:54 AM, Jerry Krinock wrote: > >> I'm getting a crash if I begin some operations and then hit the 'close' >> button on the window while the operations are in progress… >> >> I take the four parameters I receive in >> saveToURL:ofType:forSaveOperation:completionHandler: and put them into a >> dictionary in an NSOperation, and throw this operation onto the end my >> operation queue. (This project was written back in 10.5 so it does not use >> GCD.) > > Did you copy the block, or did you just add it to the dictionary as a value > (which just retains it)?
The latter, Ken. I didn't mention that I was a newbie on Blocks, having just read "Blocks Programming Topics" yesterday. "Copying Blocks" was near the end … looks like I must have fallen asleep. > This suggests that you didn't copy it. Thus, the above is the first time it > has been copied, which attempts to relocated it off of its original stack > frame and into the heap. However, that stack frame is long gone and no > longer valid. Yup. > Blocks have special memory management requirements and retaining is not > sufficient if the block is to survive its original stack frame. OK, I'll go do the homework. Thank you. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
