Re: Can't trap uncaught exceptions on Snow Leopard
Re: Can't trap uncaught exceptions on Snow Leopard
- Subject: Re: Can't trap uncaught exceptions on Snow Leopard
- From: Ken Thomases <email@hidden>
- Date: Sat, 19 Dec 2009 05:15:50 -0600
On Dec 19, 2009, at 4:56 AM, Oleg Krupnov wrote:
On Fri, Dec 18, 2009 at 1:48 AM, Ken Thomases <email@hidden>
wrote:
On Dec 17, 2009, at 8:41 AM, Oleg Krupnov wrote:
On Leopard, I used to override [NSApp reportException:] method to
track all uncaught exceptions that occur in my app.
However, I have just discovered that on Snow Leopard, this method
never gets called. Instead, the application handles the exception
somewhere inside and I only get this message in the console:
HIToolbox: ignoring exception 'Test crash' that raised inside Carbon
event dispatch
How to work around this and receive the uncaught exceptions somehow?
Have you looked at the NSExceptionHandler class and the
accompanying guide?
Yes, I tried it but it does not seem to have any effect.
I checked the [[NSExceptionHandler defaultExceptionHandler]
exceptionHandlingMask], and it's 0. I tried to set it to various
combinations, but nothing changes in the behavior of the app.
I also tried NSSetUncaughtExceptionHandler, but it does not work
either.
Any ideas? Thanks!
On taking a second look at the particular exception, it's inside
HIToolbox and Carbon. It's almost surely a C++ exception. It won't
be visible to the Cocoa/Objective-C exception handling mechanisms.
Also, I don't believe there's any way to inject your own handling
between the point where it's thrown and caught if that's all inside of
code you don't control. You should be able to break on the C++ throw
in the debugger, though.
Also, you keep referring to the exception as uncaught when it clearly
is caught. What do you think is logging that message if not an
exception handler?
Regards,
Ken
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