Finding an unhandled exception

[Mike_D]

@Beatrix_Willius

App.UnhandledException

What does you code do if you have an exception inside App.UnhandledException itself?

[Mike_D]

Other ideas:

• possibly you are having a Cocoa exception which can cause a method to silently exit - run your app with Console.log open and your app’s name in the search box.
• Or, you could try making sure your app quits on exceptions: See Crash an application on NSException - #2 by Scott_Cadillac (Though, I think this already happens on High Sierra?)
• add this line as the very first line of app.UnhandledException:
  system.debugLog "unhandled exception!!!"
  (just to prove to yourself this handler is or is not firing)

[DerkJ]

@Beatrix_Willius

No, the App.UnhandledException event has code that isn’t reached:

globals.theErrorLog.LogItem "unhandled exception!!!"

'raise error
dim theErr as new ErrorException(error, "", "", "A really unexpected error occurred!")
#Pragma Unused theErr
Valentina.ShutDown

'show the error report window
ErrorReportManager.ShowWindow("isCrashing")

Could it be that in the App.UnhandledException you have a NilObjectException causing it to be skipped or hard crashing?

So maybe you could put this above in the App.UnhandledException:

Var exception_type As String = Introspection.GetType(err).Fullname
system.log system.loglevelcritical, "!<>! " + CurrentMethodName + ", " + exception_type  + ", " + err.message

Then run it with Console.App open and filter on “!<>!”

[Sam_Rowlands]

My guess is that it is occurring in a control, and potentially from a declare or plugin, maybe even on a different thread, so for some reason it’s skipping the built-in Exception handling code from Xojo.

[Greg_O_Lone]

@Beatrix_Willius
I don’t see anything above so… are you returning True or False from the UnhandledException method? I’m asking because if returning False (or nothing) trying to show a window will outright fail because the app will be allowed to crash.

[Beatrix_Willius]

@Greg_O_Lone

I don’t see anything above so… are you returning True or False from the UnhandledException method

That’s a really good question. I don’t think I ever had the UnhandledException fire. At all. I tried with a method where I commented out the exception handler

dim f as FolderItem
f.Delete

'exception exc
'theException = new ErrorException(exc, currentMethodName)

But even there I get the normal exception behaviour.

Anyways. I wrangled with the SVN. Whatever I merged from before the NOE with the current version all is now good.

[Arnaud_N]

@Beatrix_Willius

Anyways. I wrangled with the SVN. Whatever I merged from before the NOE with the current version all is now good.

So sad… Now we’ll never know what went wrong

[Julia_Truchsess]

@Arnaud_N

So sad… Now we’ll never know what went wrong

Just Murphy paying a brief visit.

[Joe_Huber]

Murphy always returns… best to say hi and have a long discussion with him whenever you can.