| Re: How to find if an object contains another [message #22144 is a reply to message #22138] |
Thu, 19 October 2000 00:00  |
promashkin
Messages: 169
Registered: December 1999
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Senior Member |
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I would try
if obj_valid((model->get(/all,isa='idlgrsurface'))[0]) then $
print,'Has one or more surface' $
else $
print,'Has no surfaces'
or, better yet, because it provides a useful list as the result:
surf_list = model->get(/all,isa='idlgrsurface', count=n_surfs)
if n_surfs gt 0 then .....
Same thing about finding out if GetbyName returned a valid object.
Cheers,
Pavel
Dave Greenwood wrote:
>
> 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?
>
> A related question is: how do I test if an object pointer (returned by
> the GetByName method, for example) is null?
>
> Thanks,
> Dave
> --------------
> Dave Greenwood Email: Greenwoodde@ORNL.GOV
> Oak Ridge National Lab %STD-W-DISCLAIMER, I only speak for myself
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