Calling Perl Subroutines From C

James Brown Mon, 10 Nov 2003 08:47:02 -0800

Hello All,

I am trying to call perl subroutines from within C and have read 'Perlcall' and 'PerlEmbed' (which did confuse me a little). I would really appreciate it if anyone with more experience could possibly help me with the following questions?

1. I have tried a (very simple) test to call a perl function (hi::say_hi) which is installed as a perl module on my system. Unfortunately, I know I've misunderstood something and I just can't get it to run even after RTFM. Could someone point out what I've done wrong please?

*****C Function - test.exe*****
#include <stdio.h>
#include <EXTERN.h>
#include <perl.h>

static PerlInterpreter *my_perl;

int main( void )
{
        printf( "This program invokes a Perl Script\n" );

        dSP;
        PUSHMARK(SP);
        //Perl Call
        call_pv("hi::say_hi", G_DISCARD | G_NOARGS);

        return 0;
}

*****Perl Function*****
package hi;

use strict;

...

#Function to be called from C
sub say_hi {
        print "Hello from Perl";
}

As for the IDE, I'm using VisualStudio.NET and have included perl56.lib as per the Perlembed instructions. The C compiles correctly, but when running, I see the following error as soon as the "dSP;" macro is run:

"An unhandled exception of type 'System.NullReferenceException' occurred in test.exe Additional information: Object reference not set to an instance of an object."

What am I doing wrong?

2. To call a perl sub, does the sub have to be installed as a package or can it be a simple script file (eg .pl file) ?

3. I don't know much about PerlXS. Do I need to create an XSUB interface?

Many thanks to anyone who replies.
Regards,

James.


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Calling Perl Subroutines From C

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