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Re: Allocating memory in LINKIMAGE program [message #20761 is a reply to message #20680]

Thu, 20 July 2000 00:00

Randall Frank
Messages: 17
Registered: October 1999

Junior Member

Virginia,
You can use something like this to return an array of (n)
strings:

s = (IDL_STRING *)IDL_MakeTempVector(IDL_TYP_STRING,
n, IDL_BARR_INI_ZERO, &vpTmp);
for(i=0;i<n;i++) IDL_StrStore(s++,YourCStringArray[i]);
IDL_VarCopy(vpTmp,argv[0]);

In general, do not pass memory you allocated with malloc back
to IDL, especially if you want IDL to clean it up later for you.

Hope it helps.

Virginia Rogers wrote:
>
> I have a C program which queries a database and returns a list of all matching
> entries. I am making this routine callable in IDL with LINKIMAGE. I'd like to
> return a string array to the calling IDL program. My question is, how do I
> allocate the memory to store the strings? The C program has allocated space for
> all of the strings with malloc(). Can I call IDL_MakeTempArray() to create the
> string array and then set each of the string pointers to point to the location
> allocated by malloc()? Is there another source of information about using
> LINKIMAGE other than the IDL Advanced Development Guide?
>
> Thanks! Ginny

--
rjf.
Randy Frank | ASCI Visualization
Lawrence Livermore National Laboratory | rjfrank@llnl.gov
B451 Room 2039 L-561 | Voice: (925) 423-9399
Livermore, CA 94550 | Fax: (925) 423-8704

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[Message index]

		Allocating memory in LINKIMAGE program By: Virginia Rogers on Wed, 19 July 2000 00:00
		Re: Allocating memory in LINKIMAGE program By: Randall Frank on Thu, 20 July 2000 00:00
		Re: allocating memory By: Karl Schultz on Thu, 18 October 2007 11:52
		Re: allocating memory By: rtowler on Thu, 18 October 2007 09:24
		Re: allocating memory By: Jean H. on Thu, 18 October 2007 08:41
		Re: allocating memory By: R.G.Stockwell on Thu, 18 October 2007 08:37
		Re: allocating memory By: Andrew Cool on Sat, 20 October 2007 01:14
		Re: allocating memory By: MP on Thu, 18 October 2007 08:25
		Re: allocating memory By: krastoboy on Thu, 18 October 2007 01:10

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