<H2><A HREF="4mq340$jn7@thetimes.pixel.kodak.com">[PREV]</A>  [NEXT]  <A HREF="Pine.SOL.3.91.960508084220.7201A-100000@fastss10">[PREV Thread]</A>  <A HREF="3190AE69.2781E494@e-commerce.com">[NEXT Thread]</A>  <A HREF="news:comp.lang.perl.misc">[Index]</A>  </H2><HR><ADDRESS> roehrich@cray.com (Dean Roehrich)
</ADDRESS>
<TITLE> Re: Passing a pointer to C function ?</TITLE>
<ADDRESS><H1> Re: Passing a pointer to C function ?</H1>
</ADDRESS>
<ADDRESS> Cray Research, Inc.
 8 May 96 14:00:19 CDT
</ADDRESS>

<DL>

<DT> Newsgroups:
<DD> <A HREF="news:comp.lang.perl.misc">comp.lang.perl.misc</A>
<DT> References:
<DD> <A HREF="news:<4mq340$jn7@thetimes.pixel.kodak.com"><4mq340$jn7@thetimes.pixel.kodak.com></A>
</DL>
<HR>
<PRE>In article <4mq340$jn7@thetimes.pixel.kodak.com>,
Tony Whyte <whyte@sector.kodak.com> wrote:
&gt;
&gt;
&gt;I have created an extension to a C program one of whose parameters is a 
&gt;pointer to a particular type of data structure. I've created a typemap 
&gt;entry of T_PTROBJ for the data structure (not sure if I had to since Im
&gt;not really passing the structure itself)

T_PTROBJ, and similar maps, are used to handle the _pointer_ for the data
structure.  The basic form of these maps creates an SV and stores the value
of the pointer in that SV--a Perl object shadowing a C object.

&gt; but Im not sure how I specify the 
&gt;pointer parameter when calling the function from perl. I've CookbookB'd,
&gt;and perldoc'd around  but cant find the trick. 

You cannot fabricate a pointer out of nothing.  Somehow you have to give
Perl the ability to allocate a copy of the structure and to get a pointer to
that structure.  The "Struct1" and "Opaque" examples in CookBookB cover this
basic case.

[posted&mailed]

Dean
roehrich@cray.com
</PRE>
<HR><H2><A HREF="4mq340$jn7@thetimes.pixel.kodak.com">[PREV]</A>  [NEXT]  <A HREF="Pine.SOL.3.91.960508084220.7201A-100000@fastss10">[PREV Thread]</A>  <A HREF="3190AE69.2781E494@e-commerce.com">[NEXT Thread]</A>  <A HREF="news:comp.lang.perl.misc">[Index]</A>  </H2>