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Re: Attempt to store into an expression: Structure reference [message #63282 is a reply to message #63281]

Tue, 04 November 2008 08:44

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

greg.addr@googlemail.com writes:

> I'm doing something wrong here, but what - I'm not sure...
>
> IDL> help,s.tab
> <Expression> POINTER = <PtrHeapVar26>
>
> IDL> help,*(s.tab)
> <PtrHeapVar26> STRUCT = -> TAB Array[2]
>
> IDL> help,(*(s.tab))[0]
> <Expression> STRUCT = -> TAB Array[1]
>
> IDL> help,((*(s.tab))[0]).img
> <Expression> POINTER = <NullPointer>
>
> IDL> ((*(s.tab))[0]).img=ptr_new(image)
> % Attempt to store into an expression: Structure reference.
>
> Any ideas why I can't assign something to this pointer?

Too much work to test this, but I think you have an
extra set of parentheses. I think it should be like
this:

((*(s.tab))[0].img=ptr_new(image)

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]

		Re: Attempt to store into an expression: Structure reference By: David Fanning on Tue, 04 November 2008 10:54
		Re: Attempt to store into an expression: Structure reference By: R.Bauer on Tue, 04 November 2008 09:40
		Re: Attempt to store into an expression: Structure reference By: David Fanning on Tue, 04 November 2008 09:12
		Re: Attempt to store into an expression: Structure reference By: greg.addr on Tue, 04 November 2008 08:58
		Re: Attempt to store into an expression: Structure reference By: Foldy Lajos on Tue, 04 November 2008 08:57
		Re: Attempt to store into an expression: Structure reference By: David Fanning on Tue, 04 November 2008 08:44
		Re: Attempt to store into an expression: Structure reference By: David Fanning on Tue, 04 November 2008 08:44
		Re: Attempt to store into an expression: Structure reference By: Vince Hradil on Tue, 04 November 2008 08:39
		Re: Attempt to store into an expression: Structure reference By: greg.addr on Wed, 05 November 2008 00:31

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