[newbie] Storing pointer C-sturcture into Perl-Object

[Tom Schindl]

Hi,

Hope this is not too elementary for this group else please redirect to 
another group which is more appropiate for XS-newbies like me.

After programming perl for 5 years I thought it is time to learn XS and 
so I walked through the XS-manpages and amazingly everythings worked 
fine until I had the idea that I could restore a C-structure into my 
perl-Object.

----------------------------8<----------------------------
void
xs_convert( self, svgfile, bitmapfile, dpi=0, format="png", quality=100  )
        SV     * sv
        char   * svgfile
        char   * bitmapfile
        double   dpi
        char   * format
        int      quality
    PREINIT:
        HV* real_obj = (HV *)SvRV(self);
    CODE:
        GdkPixbuf *pixbuf;
        g_type_init ();

        if (dpi > 0.) {
            rsvg_set_default_dpi (dpi);
        }
        pixbuf = rsvg_pixbuf_from_file( svgfile, NULL );

        hv_store(real_obj, "pixbuf", 6, ???what goes here???, 0);

        save( quality, format, pixbuf, bitmapfile );

        g_object_unref ( G_OBJECT (pixbuf) );   
----------------------------8<----------------------------
I'm not sure about the following things:

1. How to store a value into a instance-var
2. How to store the value of pixbuf into the an perl var
thx

Tom