Thx for the advice, yes I got it already from Frankfurt. I need to understand the module a little bit better. I think this resolves the 2nd problem, dealing with the C structures migrated into Perl space in some magic way, via the Perl stack using XS.
Once this works my second question: what about performance ?
Is it faster to fiddle around the C struct in C and use the Perl stack or give just a pointer to Perl and fiddle around the C-struct in Perl ? This needs more investigaton into the Convert::Binary::C. Any advice onto this would be highly appreciated.