Excuse me David, I forgot to mention in my
last message one thing. When I say that S_alloc has two arguments, it’s
because I found a topic on that function in the help of the S-Plus language reference. In my version 4.5, here
is the usage : char *S_alloc(nelem, elsize). I suppose that the 3rd argument
came in later versions only. The question remains : how can I plug the
arguments if the compiler expects no one?
Patrick
From:
david.jessop@ubs.com [mailto:david.jessop@ubs.com]
Sent: Thursday, May 25, 2006 6:27
AM
To: Agin, Patrick;
s-news@lists.biostat.wustl.edu
Subject: RE: C call - memory
problem
Patrick,
I think you've come up against the famous
"not quite accurate documentation" problem. I'm running with a
later version than you, but my version of S needs three parameters, e.g.:
char *pcName = (char *) S_alloc
(iMaxNameLen, sizeof (char), S_evaluator);
I only found this by searching through
the header files with grep (or your favourite text search routine) for the
prototype.
Hope this helps,
David
From:
Agin.Patrick@hydro.qc.ca [mailto:Agin.Patrick@hydro.qc.ca]
Sent: 24 May 2006 20:04
To: s-news@lists.biostat.wustl.edu
Subject: C call - memory problem
Dear all,
I built a DLL (under VC++) and loaded it
in S-Plus (version 4.5, Windows XP)
with dll.load(). When I do the call to my C function, S-Plus
crashes and the following message appears:
SPLUS.EXE – Application Error
The instruction at {xxx}
referenced memory at {yyy}. The
memory could not be “read”.
The crash occurs between the end of the C
function and the return to S-Plus. I
suspect problems with the malloc/free calls so I wanted to replace them with
S_alloc calls only but the compiler does not like it: “S_alloc function
does not take 2 arguments” yet I included the header <S.h> as
mentionned in the Programmer’s Guide. What am I doing wrong? Is the
problem elsewhere? What could it be? I must admit that after reading topics in
the S-news about C calls from S-Plus,
I’m quite confused because some elements seem to apply only to more
recent versions of my “good-old” S-Plus
4.5.
Any hints would be very appreciated.
Patrick