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Re: Attempt to store into an expression: Structure reference [message #63277 is a reply to message #63276]

Tue, 04 November 2008 09:12

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

=?ISO-8859-2?Q?F=D6LDY_Lajos?= writes:

>
> On Tue, 4 Nov 2008, greg.addr@googlemail.com wrote:
>
>>
>> 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.
>>
>
> Seems to be an IDL bug. This works in FL:
>
> s={s, tab:ptr_new()}
> tab={tab, img:ptr_new()}
> s.tab=ptr_new(replicate(tab, 2))
> ((*(s.tab))[0]).img=ptr_new(dist(100))

This is what I had in mind:

s={s, tab:ptr_new()}
tab={tab, img:ptr_new()}
s.tab=ptr_new(replicate(tab, 2))
(*(s.tab))[0].img=ptr_new(dist(100))

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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