Re: Stay-open applet - problems on quitting
Re: Stay-open applet - problems on quitting
- Subject: Re: Stay-open applet - problems on quitting
- From: Richard Morton <email@hidden>
- Date: Tue, 18 Nov 2003 17:17:05 +1100
On Friday, November 14, 2003, at 09:31 PM, julifos wrote:
It would be fine if it actually quit, but it returns to what it was
doing before. I guess there'll be a way of dealing with it...
Perhaps I'd try a simple try... end try, would be less intensive. For
example, if you observe that errors are allways about "undefined
varialbes",
you can use this:
######################
on idle
try
getBaseData()
on error msg number n
if n = -2753 then --> undefined var
quit --> go to quit handler
else
--> let the user know?
This would work, but I was trying to avoid it because it would catch
any undefined var error - too big a net. I've done this sort of thing
before & have found it can make for a particularly ugly debugging
experience. ;)
Or define a global checking:
###################### * untested code...
I ended doing something along these lines:
property haveCleanedUp : false
on run
set haveCleanedUp to false -- first up, reset the flag
-- the init stuff
end run
on idle
try
-- the idle stuff
on error errStr number errNum
if haveCleanedUp then
-- we've already been through the quit handler & done the cleanup
stuff - ignore the error
else
-- handle the error
quit
end if
end try
end idle
on quit
try
if not haveCleanedUp then
-- the cleanup stuff
set haveCleanedUp to true
end if
on error errStr number errNum
-- handle the error
end try
continue quit
end quit
With this structure and under the conditions that were causing the
problem, this is what happens:
(1) Enters idle processing
(2) Quit is invoked by user
(3) Quit handler executes
(4) Idle processing resumes, finishes &/or errors out
(5) Applet actually quits - quit handler is not executed again
Thanks Don, jj & kai for the suggestions.
Cheers,
Thurston Lastout
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