Checking for 'quit' and aborting shutdown

[Graham Samuel]

This is probably a very ancient issue, but I haven't had to deal with it before:

I've only tried this on the Mac, but I decided to put in a query in a desktop app, "Do you really want to quit?" when a user chooses 'Quit' from a file menu (it's part of a 'shutdownRequest' handler). This obviously requires a response from the user in order to continue. This is fine, unless the user of the whole machine decides to shut it down without closing my app. Then I find that my little dialog is invoked and demands a response before shutting down, but I may not be there to respond to the dialog. Is there any way to effectively detect a general shutdown as opposed to just 'quit'? I think the same problem applies to Windows as well, but I haven't tested it.

Graham