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Re: dereferencing pointer arrays. [message #33959]

Wed, 05 February 2003 20:33

Rochelle Hatton
Messages: 2
Registered: February 2003

Junior Member

It's always an obvious thing isn't it.
That's exactly what I am missing- a few extra brackets!
Thanks.

David Fanning wrote:

>
> It doesn't even matter that you have pointer arrays:
>
> IDL> ptrarray = ptrArr(2)
> IDL> ptrarray[0] = ptr
> IDL> bb = Assoc(lun, bytarr(64, 64, 15))
> IDL> ptrarray[1] = ptr_new(bb)
> IDL> vol = (*ptrarray[1])[0]
>
> I think the whole point of using the pointer in the previous
> context is that it was the only way to pass an associated variable
> in an info structure between widget program modules. There
> was no way to store the associate variable in the structure
> otherwise. It was the sort of thing that was likely to impress
> the IDL EPA committee, but pretty much useless otherwise. :-)
>
> Cheers,
>
> David
>
> P.S. The alternative is to store the lun in the structure,
> and make the associated variable (using the lun) whenever you need it.
>
>

--
Rochelle Hatton
Medical Physicist
Department of Nuclear Medicine and Ultrasound
Westmead Hospital ph(02) 9845 7223

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		Re: dereferencing pointer arrays. By: Rochelle Hatton on Wed, 05 February 2003 20:33
		Re: dereferencing pointer arrays. By: David Fanning on Wed, 05 February 2003 19:51

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