Makefile.PL

use 5.008009;
use ExtUtils::MakeMaker;

WriteMakefile(
    NAME              => 'GPS',
    VERSION_FROM      => 'GPS.pm',
    PREREQ_PM         => {},
    ABSTRACT_FROM  => 'GPS.pm',
    AUTHOR         => 'Ziggi Stardust',
    LIBS              => [''],
    DEFINE            => '',
    INC               => '',
    # OBJECT            => '$(O_FILES)',
);

GPS.pm

package GPS;
use strict;
use Carp;
 
use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK $AUTOLOAD);
 
require DynaLoader;
use AutoLoader 'AUTOLOAD';
 
@ISA = qw(DynaLoader);
 
$VERSION = '0.01';
bootstrap GPS $VERSION;
 
BEGIN { }
1;
__END__

GPS.xs

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
 
typedef struct data {
   char *date;
   char *serial;
} DATA;
 
typedef DATA* GPS;
 
MODULE = GPS PACKAGE = GPS
 
PROTOTYPES: DISABLE
 
GPS
new(class)
        SV  *class;
    PREINIT:
        DATA* data;
    CODE:
        if ((data = malloc(sizeof(DATA))) == NULL) {
            croak("GPS new");
        }
        data->serial = "";
        data->date = "";
        RETVAL = data;
  OUTPUT:
        RETVAL
 
void*
set_serial(class, serial_SV)
        GPS class;
        SV* serial_SV;
    CODE:
        class->serial = SvPV_nolen(serial_SV);
 
char*
get_serial(class)
        GPS class;
    CODE:
        RETVAL = class->serial;
  OUTPUT:
        RETVAL
 
 
void*
set_date(class, date_SV)
        GPS class;
        SV* date_SV;
    CODE:
        class->date = SvPV_nolen(date_SV);
 
char*
get_date(class)
        GPS class;
    CODE:
        RETVAL = class->date;
  OUTPUT:
        RETVAL
 
 
SV *
get_data(class);
        GPS class;
    PREINIT:
        HV *hash;
        char *date_label = "date";
        char *serial_label = "serial";
 
    CODE:
        hash = newHV();
        hv_store(hash, date_label, strlen(date_label), newSVpv(class->date, strlen(class->date)), 0);
        hv_store(hash, serial_label, strlen(serial_label), newSVpv(class->serial, strlen(class->serial)), 0);
        RETVAL = newRV_noinc((SV*)hash);
    OUTPUT:
        RETVAL

typemap

GPS T_PTROBJ

gps.pl

#!/usr/local/bin/perl
use strict;
use Mojo::Util qw(dumper);

my $b = GPS->new;
$b->set_serial('0x123');
$b->set_date('1970-11-01');
print dumper $b->get_data;

# perl Makefile.PL
# make
# make install
# ./gps.pl
 
{
  "date" => "",
  "serial" => ""
}
{
  "date" => "1970-11-01",
  "serial" => "0x123"
}