| Re: Catalyst CatDestroyDefaults [message #67087 is a reply to message #66978] |
Tue, 23 June 2009 06:26  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Crane writes:
> I am trying to use CatSetDefault to set some of my system settings,
> for instance:
>
> oLang = Obj_New('languageclass')
> CatSetDefault, 'language', oLang
>
> When my application is destroyed, the CatDestroyDefaults is called
> automatically, I expected this procedure will clean up all system
> settings, so I did not destroy the oLang object by myself.
> Unfortunately, oLang is not cleaned up, it is still in memory. Should
> I have to explicitly destory the system settings in cleanup method ,
> or where am I wrong?
>
> I try to find what happens using debug mode, and know the
> CatDestroyDefaults procedure finally go to the CatContainer::Cleanup
> method, this method remove all child objects so they don't get
> destroyed automatically, I think this is why oLang is not destroy.
>
> I do not understand this, because we need CatDestroyDefaults to
> automatically destroy all the system settings when we destroy the
> application.
It is probably appropriate that this comes on the heels of
another discussion a week or so ago about the inability of
UNDEFINE to undefine everything. And the reason for the problem
is similar. It never occurred to me to store a heap variable
in a Catalyst default value. ;-)
But, now I know someone wants to do that, the solution is simple.
If the internal pointer points to a heap variable, destroy that, too.
And since I already spent an hour getting UNDEFINE to do just that
a week ago, I decided to use that to get the job done.
So, be sure you have the latest UNDEFINE, and you can download
a new CatListValue object here:
http://www.dfanning.com/programs/undefine.pro
.../programs/catalyst/source/core/catlistvalue__define.pro
Tested only lightly, as I am late for work, as usual. :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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