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Re: Building sharable object libraries for CALL_EXTERNAL [message #14699 is a reply to message #14670]

Mon, 22 March 1999 00:00

David Foster
Messages: 341
Registered: January 1996

Senior Member

Octavi Fors wrote:

> Taking a look at the routine.c code (it's in the first message), I
> noticed that the
> **pointer (output) I'm passing back to IDL is malloced in the
> C-routine, in line:
>
> output=(float **)malloc(4*n);
> for(i=0;i<n;i++) output[i]=(float*)malloc(4*x*y);
>
> Is there something wrong with this?

I thought it was a no-no to allocate memory inside of an external
routine, that is to be passed back to IDL. The Advanced Developer's
Guide has always stated that all memory must be allocated prior to
calling the routine. Is that not always the case?

Even if you get this to compile, I would be very wary of the results.

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]

		Building sharable object libraries for CALL_EXTERNAL By: Octavi Fors on Fri, 12 March 1999 00:00
		Re: Building sharable object libraries for CALL_EXTERNAL By: rmlongfield on Wed, 17 March 1999 00:00
		Re: Building sharable object libraries for CALL_EXTERNAL By: korpela on Mon, 15 March 1999 00:00
		Re: Building sharable object libraries for CALL_EXTERNAL By: Octavi Fors on Sat, 13 March 1999 00:00
		Re: Building sharable object libraries for CALL_EXTERNAL By: David Foster on Mon, 22 March 1999 00:00
		Re: Building sharable object libraries for CALL_EXTERNAL By: Dr. G. Scott Lett on Mon, 22 March 1999 00:00
		Re: Building sharable object libraries for CALL_EXTERNAL By: Octavi Fors on Thu, 18 March 1999 00:00

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