On 5/28/21 4:21 PM, Matt Jacobson wrote:
On May 28, 2021, at 6:54 PM, James Walker via Cocoa-dev
<cocoa-dev@lists.apple.com> wrote:
When an uncaught exception is raised, I want to log some information about it but let it continue on as normal. But when I use
NSExceptionHandler, an uncaught exception displays an "Internal Error" modal dialog with buttons "Show Details",
"Crash", and "Continue". I don't see any explicit mention of this dialog in the API docs for NSExceptionHandler or in
the "Exception Programming Topics" guide. I suppose that is what is meant when the documentation of the method
setExceptionHangingMask: talks about cases that will "halt execution for debugging". But I set this mask to 0, so I would think
it would never show the dialog, yet it does. I have an NSExceptionHandlerDelegate whose delegate methods always return NO, meaning do not
handle or log the exception. Is there any way to just watch exceptions go by without showing this dialog?
Without commenting on the wisdom of blowing past exceptions 😉, I’ll note that:
1. NSExceptionHandler doesn’t allow you to prevent uncaught exceptions (whether
truly uncaught or caught by one of AppKit’s last-resort catches) from being
reported to +reportException:. It in fact goes out of its way to make sure it
does not impede this
2. Buuuut… the default behavior in Cocoa of an uncaught exception is to ignore
it. You’re seeing this dialog because you have the user default
`NSApplicationShowExceptions` set somewhere. (Use `defaults find` to help find
out where.) It’s not on by default, but you may have turned it on at some
point because of the aforementioned wisdom
Thank you very much. NSApplicationShowExceptions was indeed turned on
in the global domain; I probably did that years ago and forgot about
it. And I didn't know about Cocoa defaulting to ignoring uncaught
exceptions, I thought it would kill the app like uncaught C++ exceptions
do. So I wasn't expecting to "blow past" exceptions, I was expecting to
crash.
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