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Re: problem [message #51038 is a reply to message #50579]

Tue, 31 October 2006 08:47

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

taejon writes:

> I have a problem of running this program (I am newbie in IDL...:
>
> When I run this prog (compiles OK) it should when I press the
> 'dismis'-button remove the value in the textfield named 'a0'. But I get
> always the error:
>
> "pointer type required in this context"
>
> can somebody give some help ?

You need to find some way to pass the pointer containing
your program "state" from the efgcalc1 program module, where
it is created, to the event handlers, where it is needed.
Typically, we use the user value of the top-level base
to do this. Put the pointer there:

Widget_Control, tlb, Set_UValue=pstate

And when you need it in your event handlers, retrieve
it from there:

Widget_Control, event.top, Get_UValue=pstate

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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[Message index]

		Problem displaying images on 8 bit monitor By: mark on Mon, 09 October 2006 13:46
		Re: problem By: taejon on Thu, 02 November 2006 00:17
		Re: problem By: taejon on Thu, 02 November 2006 00:01
		Re: problem By: David Fanning on Tue, 31 October 2006 08:47

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