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Re: Data passing & CALL_EXT [message #8259 is a reply to message #8255]

Fri, 21 February 1997 00:00

Phil Williams
Messages: 78
Registered: April 1996

Member

mallozzi@ssl.msfc.nasa.gov wrote:
>
> Hi,
>
> Is it possible to pass the following data structures from C code back
> to IDL via CALL_EXTERNAL:
>
> 1. An array of strings?
> 2. A C structure, containing int, float, char
> 3. A C union
>
> I got my C code to pass back a single string, but could not do an
> array of strings. Really I would like to pass a structure back to
> IDL. Does anyone have any examples of this? The IDL examples treat
> only the simplest cases.
>
> -bob
>
> PS I am using OpenVMS :-(

The returned variable from a call_external can only be a single value.
If you want to pass more than one then you must first create the var in
IDL and pass it to call_external. Then in your C function you place
your answer into this var.

Hope this helps,
Phil
--
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Phil Williams, Ph.D.
Research Instructor
Children's Hospital Medical Center "One man gathers what
Imaging Research Center another man spills..."
3333 Burnet Ave. -The Grateful Dead
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email: williams@irc.chmcc.org
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[Message index]

		Re: Data passing & CALL_EXT By: rivers on Fri, 21 February 1997 00:00
		Re: Data passing & CALL_EXT By: davidf on Fri, 21 February 1997 00:00
		Re: Data passing & CALL_EXT By: Achim Hein on Fri, 21 February 1997 00:00
		Re: Data passing & CALL_EXT By: Phil Williams on Fri, 21 February 1997 00:00

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