Re: First cocoa app & crashes

FROM : Michael Norris
DATE : Mon Nov 18 23:01:45 2002

Oli,

>- Use distributed objects (see documentation or the list archives at
>cocoa.mamasam.com for more information).
>- In 10.2, use NSObject's
>"performSelectorOnMainThread:withObject:waitUntilDone:" method,
>which will save you the trouble of distributed objects but somewhat
>limit your architectural options (in that everything has to be in
>the same class).

If you seriously consider threading your app, it might be worth
getting a hold of O'Reilly's "Building Cocoa Applications" by
Garfinkel & Mahoney, which has a good section on Cocoa threading.

>2. Regarding your crash problem, it is difficult to say what the
>problem is without seeing your code, but I can tell you this: when
>you see that type 10 or 11 error it is (at least in my experience)
>almost always because you released something you shouldn't have.  I
>would look very carefully at your code and think about all of your
>"releases" and whether you might be releasing one of your objects
>one too many times.  I would definitely look at the crash log and
>try to determine which release actually caused the problem.

I agree: a crash that occurs during an autorelease is almost
definitely due to autoreleasing something that's already been
released or autoreleased. If it's crashing on an objc msg-send, it
probably means that obj doesn't exist any more....
  -mike
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