comp.lang.idl-pvwave archive: archive » Building sharable object libraries for CALL

Home » Public Forums » archive » Building sharable object libraries for CALL_EXTERNAL

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Building sharable object libraries for CALL_EXTERNAL [message #14697 is a reply to message #14591]

Mon, 22 March 1999 00:00

Dr. G. Scott Lett
Messages: 14
Registered: February 1998

Junior Member

I don't think this is true. Functions like IDL_MakeStruct(),
IDL_ImportArray() and IDL_ImportNamedArray(),
are handy for building IDL variables with memory you allocate.

However, the following code will most likely not produce the desired
results. Reading the External Development Guide is a recommended first
step, especially the chapter on IDL Internals: Variables.

> output=(float **)malloc(4*n);
> for(i=0;i<n;i++) output[i]=(float*)malloc(4*x*y);

Scott

>
> 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
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~

Report message to a moderator

[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

Previous Topic:	Writing on X without X device (!)
Next Topic:	Re: Colour maps ... (BYTE_SCALE)

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 05:04:27 PDT 2025

Total time taken to generate the page: 0.88101 seconds