on quit event or something like that

[tibucci]

I’ve build an applescript App that stays open and keeps checking some condition, I’d like it to ask me the user password if i try to quit it, or run some code when i quit it. but can’t seem to find an option like that
is it possible? or must i have another app that check if the first gets closed to run the code(that would be awful)?

Thanks to everyone and sorry for the poor english

[alastor933]

Straight from the AppleScript Language Guide:

For example, this handler checks with the user before allowing the application to quit:

on quit
	display dialog "Really quit?" buttons {"No", "Quit"} default button "Quit"
	
	if the button returned of the result is "Quit" then
		continue quit
	end if
	
	-- Without the continue statement, the application doesn't quit.
	
end quit

Warning: If AppleScript doesn’t encounter a continue quit statement while executing an on quit handler, it may seem to be impossible to quit the application. For example, if the handler shown above gets an error before the continue quit statement, the application won’t quit. If necessary, you can use Force Quit (Command-Option-Esc) to halt the application.