The hockeyApp framework has a lot explanation about this:

https://www.hockeyapp.net/help/sdk/mac/4.0.2/Classes/BITCrashExceptionApplication.html

Best
Georg Seifert


> Am 14.06.2018 um 14:33 schrieb Casey McDermott <supp...@turtlesoft.com>:
> 
> Thanks, this is all useful info.  I checked NSExceptionHandler and
> NSUncaughtExceptionHandler, but they are just for logging before termination.
> NSRunLoop is accessible but there's not much there.
> 
> However, simply replacing the C++ throw with a Cocoa exception via
> [NSException raise : errString  format : errString]; seems to work great.
> Apparently it unwinds the call stack and is swallowed in the run loop.  
> 
> It doesn't use the error string but that's fine.  We already show a dialog 
> before the throw, with file & line number. Helps enormously for fixing bugs.
> 
> Thanks for all the help,
> 
> Casey McDermott
> 
> --------------------------------------------
> On Thu, 6/14/18, Alastair Houghton <alast...@alastairs-place.net> wrote:
> 
> Subject: Re: Exception handling
> To: "Jens Alfke" <j...@mooseyard.com>
> Cc: "Casey McDermott" <supp...@turtlesoft.com>, "cocoa-dev list" 
> <cocoa-dev@lists.apple.com>
> Date: Thursday, June 14, 2018, 1:11 PM
> 
> On 14 Jun
> 2018, at 18:00, Jens Alfke <j...@mooseyard.com>
> wrote:
> 
> On Jun 13, 2018, at 7:22
> PM, Casey McDermott <supp...@turtlesoft.com>
> wrote:
> 
> Our Carbon event loop had
> a try/catch block, which caught most exceptions, and then
> continued.  It started
> as an expedient in early production, but it remained in
> production code 
> since
> it often allows users to continue, save their work, etc.
>  
> 
> That's actually how
> Cocoa used to work. I can't recall whether an alert
> panel popped up or if it was just silent. The behavior
> changed to crashing sometime in the past, um, 8 years or
> so.
> 
> I don’t
> think it’s changed in any obvious way; the framework has
> always swallowed exceptions in certain contexts, but not in
> others. Obviously the precise detail may have changed over
> time, but it’s certainly crashed on exceptions for as long
> as I remember, outside of the places where they get ignored
> for whatever reason.
> Is there a way to override
> the event loop in Cocoa?  Some other way we can escape to
> 
> the event loop and
> then continue from there? 
> 
> There used to be either a callback or
> an overridable NSApplication method to handle an uncaught
> exception, but looking at current headers I can't find
> what I'm looking for; maybe it's been gone for a
> long time and removed?
> 
> Perhaps
> you’re thinking of NSSetUncaughtExceptionHandler()? I
> don’t think there’s much you can usefully do from that,
> though, besides logging the exception.
> Kind regards,
> Alastair.
> --http://alastairs-place.net
> 
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