| Re: Error on shutdown of widget !@$% [message #24626] |
Wed, 11 April 2001 03:00  |
R.Bauer
Messages: 1424
Registered: November 1998
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Senior Member |
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Sean Heukels wrote:
>
> How do I get rid off, or catch this error ??
>
> When I shutdown my widget program by clciking exit, in my menubar, I can
> reset colors, structures, the whole thing.
> But when I click the Top-right-cross (Windows) And top-left=box on Unix,
> which shutsdown the current process, I get an error by widget_event,
> that this one ('named by number') is not defined.
>
> I wish to clean up the variables that I clean on pushing exit in the same
> way and dont want 2 create errors.
>
> How can this be done ??
>
> Thnks Sean
Another posibilty instead of KILL_NOTIFY described by Marc
is to supress this feature.
This is done by the keyword TLB_FRAME_ATTR to widget_base()
Value Meaning
1 Base cannot be resized, minimized, or maximized.
2 Suppress display of system menu.
4 Suppress title bar.
8 Base cannot be closed.
16 Base cannot be moved.
regards
Reimar
--
Reimar Bauer
Institut fuer Stratosphaerische Chemie (ICG-1)
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
http://www.fz-juelich.de/icg/icg1/
=============================================
a IDL library at ForschungsZentrum J�lich
http://www.fz-juelich.de/icg/icg1/idl_icglib/idl_lib_intro.h tml
http://www.fz-juelich.de/zb/text/publikation/juel3786.html
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| Re: Error on shutdown of widget !@$% [message #24642 is a reply to message #24626] |
Tue, 10 April 2001 03:52  |
marc schellens[1]
Messages: 183
Registered: January 2000
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Senior Member |
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Sean Heukels wrote:
>
> How do I get rid off, or catch this error ??
>
> When I shutdown my widget program by clciking exit, in my menubar, I can
> reset colors, structures, the whole thing.
> But when I click the Top-right-cross (Windows) And top-left=box on Unix,
> which shutsdown the current process, I get an error by widget_event,
> that this one ('named by number') is not defined.
>
> I wish to clean up the variables that I clean on pushing exit in the same
> way and dont want 2 create errors.
>
> How can this be done ??
>
> Thnks Sean
The problem here is, that when you kill the widget by the
window-manager,
your widget doesn't exist anymore when you want to read data from it.
You can define a procedure for the top level base via the KILL_NOTIFY
keyword
which will be called when the widget dies, no matter how.
This procedure gets the widget ID of the dying widget as an argument.
Alternatively you define a cleanup procedure via the CLEANUP keyword to
xmanager,
which overrides the KILL_NOTIFY. It also gets the widget ID as its
argument.
Do the cleanup in one of these procedures and just kill the widget in
the
event handler (the cleanup routine will be called then also.
Cheers,
marc
Example:
pro testKill,ID
print,'testKill'
print,widget_info(/VALID_ID,ID)
end
pro xKill,ID
print,'xKill'
print,widget_info(/VALID_ID,ID)
end
pro test_Event,event
widget_control,event.top,/DESTROY
end
pro test
tlb=widget_base(/COL,KILL_NOTIFY='testKill')
wb=widget_button(tlb,VALUE='--------------OK------------')
widget_control,tlb,/REALIZE
;; uncomment the CLEANUP keyword for using xKill instead
xmanager,'test',tlb;,CLEANUP='xKill'
end
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| Re: Error on shutdown of widget !@$% [message #24649 is a reply to message #24642] |
Tue, 10 April 2001 03:12 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Sean Heukels (sean77=cuthere=@dds.nl) writes:
> How do I get rid off, or catch this error ??
>
> When I shutdown my widget program by clciking exit, in my menubar, I can
> reset colors, structures, the whole thing.
> But when I click the Top-right-cross (Windows) And top-left=box on Unix,
> which shutsdown the current process, I get an error by widget_event,
> that this one ('named by number') is not defined.
>
> I wish to clean up the variables that I clean on pushing exit in the same
> way and dont want 2 create errors.
>
> How can this be done ??
While it *sounds* like a good idea to put all
your cleanup in the Exit button event handler,
it never works, as you have discovered, because
nobody uses it. They kill widgets with the
mouse, not by clicking the Exit button.
So, take *all* your cleanup out of the Exit button
event handler and put it in a CLEANUP routine
associated with the top-level base widget by means
of a CLEANUP keyword on the XMANAGER command.
Make a *SEPARATE* event handler for your Exit
button that does nothing but destroy the TLB.
I say *SEPARATE* because your other problem, I'm
sure, stems from having all your event handler
code in the same procedure. The error you
get on exit is because you are trying to do
something with the top-level base after you
just killed it! (90% of the time people are
trying to put something into the user value of
the top-level base after they just killed it.)
While people who know what they are doing
(Stein Vidar comes to mind) can write code
with one huge event handler, I've never known
it to be anything but totally confusing for
people just getting started with IDL. You will
have a lot more luck writing widget programs
with lots of separate event handlers, but this
is especially true for your exit button.
If you are looking for examples, you can try
any of the widget programs on my web page.
And, although it sounds like a hell of a lot
of money, getting a good book to show you
the proper way of writing widget programs
saves an enormous amount of wear and tear,
not to mention frustration. :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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