Ciao Monks:

Newbie here, and trying to do a somewhat ambitious project, so apologies if this is somewhat stupid.
I'm trying to create a perl interface to my C++ finite element code.
The basic structure of the code is as follows:
I have an initiator function
void init(int argc, char **argv, void **ptr);
which creates a new instance of my class and assigns a pointer to it (ptr)

I have several member functions such as
int version(void *ptr);
which returns the various properties i'm interested in (in this case, ptr->version)

I've created a shared C++ library (mylib.so) already.

In order to create the perl interface, I used SWIG with the following interface file:

%include "exception.i"
%exception {
    try {
        $action
        }
    catch (const std::exception &e) {
        SWIG_exception_fail(SWIG_RuntimeError, e.what());
    }
}
%module mylib
%{
/* Put headers and other declarations here */
#include "library.h"
%}

%include "std_vector.i"
%include "std_string.i"

%include "library.h"

[download]

Then I run swig and compile, which all goes well.
My question:
I want to do something like the following in perl

my $control = new mylib;
print "version: " . $control->version() . "\n";

However, whenever I try to access any of my member functions, the code complains:

TypeError in method 'version', argument 1 of type 'void *' at ./test_swig.pl line 8.

So basically, the function version expects a pointer (to self I assume???) but I'm not sure how to pass a void pointer to the C++ init function from perl
Any pointers (no pun intended) would be appreciated

Best,
Mike

In reply to interface perl to C++ code with SWIG, re: void pointers? by velVerlet1

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