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Re: passing pointers to CALL_EXTERNAL [message #11311]

Wed, 25 March 1998 00:00

David Foster
Messages: 341
Registered: January 1996

Senior Member

hdsfkj wrote:
>
> Hi Again,
>
> Is there a way to return a pointer to an array of bytes from
> CALL_EXTERNAL? My C routine
> creates the array and fills it with values. I would like to just pass a
> pointer to the array back to
> IDL. I found an old post with dejanews that suggests it isn't possible.
> I'm trying to avoid the
> performance cost that goes with creating an array in IDL, passing a
> reference to it to the C routine, and copying the previously created C
> array to the IDL array. Thanks for any help...
>
> Donald Green
> dfg@ai.mit.edu

Unless things have changed drastically the last time I looked at
the docs for CALL_EXTERNAL, you must define the array before
passing it to the C routine. An array in IDL is much more complex
than an array in C; I suppose this would be possible if you
knew a lot about the internal structure of variables in IDL, but
I would just create the array first!

Dave
--

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
David S. Foster Univ. of California, San Diego
Programmer/Analyst Brain Image Analysis Laboratory
foster@bial1.ucsd.edu Department of Psychiatry
(619) 622-5892 8950 Via La Jolla Drive, Suite 2240
La Jolla, CA 92037
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[Message index]

		Re: passing pointers to CALL_EXTERNAL By: David Foster on Wed, 25 March 1998 00:00
		Re: passing pointers to CALL_EXTERNAL By: hdsfkj on Tue, 24 March 1998 00:00
		Re: passing pointers to CALL_EXTERNAL By: davidf on Tue, 24 March 1998 00:00

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