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Re: leap variables and widgets
| Re: leap variables and widgets [message #39150] |
Tue, 20 April 2004 08:55 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Olivier Gasnault writes:
> Could anyone point out what goes wrong in the set of codes below.
>
> Run the widget1 procedure and click twice on the button.
> The program stops then.
> At this stage pvar is not a valid pointer, while it should !
> Why ?
>
> If you comment the ptr_free command then the problem disappear...
> But I do not understand why the ptr_free would be executed before the
> end of the widget2 procedure.
You make the mistake of thinking your widget2 program is
blocking in the same way that your widget1 program is blocking
the IDL command line. But it isn't. Only the program that gets
to the command line first will block. All the other programs
will run through their blocks. What you want is for widget2
to be a "modal" or "popup" program. Here are a couple of
articles you will want to read:
http://www.dfanning.com/widget_tips/modal_blocking.html
http://www.dfanning.com/widget_tips/popup.html
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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