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Re: How to find if an object contains another [message #22740 is a reply to message #22146]

Sun, 03 December 2000 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Dave Greenwood (greenwoodde@ornl.gov) writes:

> How do I determine if an object "contains" another one?
>
> For example, I can create a model object and add a surface object or
> a plot object. Given that model object, how would I find out whether
> or not a surface object has been added?
>
> The best I've come up with is something like:
>
> xx = model->get(/all,isa='idlgrsurface')
> s = size(xx)
> if s[1] eq 11 then $
> print,'Has one or more surface' $
> else $
> print,'Has no surfaces'
>
> Surely there's a simpler way?

How about something like this:

xx = model->get(/all,isa='idlgrsurface', Count=numFound)
Print, numFound

> A related question is: how do I test if an object pointer (returned by
> the GetByName method, for example) is null?

If an object is NULL it is an invalid object:

IF Obj_Valid(theObject) EQ 0 THEN Print, 'Object is invalid.'

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/
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[Message index]

		How to find if an object contains another By: Dave Greenwood on Thu, 19 October 2000 00:00
		Re: How to find if an object contains another By: davidf on Sun, 03 December 2000 00:00
		Re: How to find if an object contains another By: davidf on Wed, 17 January 2001 06:01

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