RE: XML under ActiveState Perl for 64-bit Windows

> From: Randy Kobes [mailto:[email protected]]
> Sent: Wednesday, May 06, 2009 11:25 PM
> To: Jan Dubois
> Cc: John Dlugosz; [email protected]
> Subject: Re: XML under ActiveState Perl for 64-bit Windows
> Something I've been asked about, and was wondering myself, since I
> don't have a 64 bit machine to play with - would a ppm package:
>       http://cpan.uwinnipeg.ca/dist/XML-LibXML
> built on a 32 bit machine work on a 64 bit machine (in principle)? For
> XML::LibXML, this would mean the external libxml2 library, as well as
> the perl glue, that goes into making the ppm package would have to be
> compatible.


In Windows, a 64-bit process can only load 64-bit DLLs, and a 32-bit
process can only load 32-bit DLLs.

Now if it's not done with LoadLibrary, but by using COM, the concepts of
hosting a DLL (normally an in-proc server) in a shell EXE to make it
out-of-process is well-established.  That would have no trouble
marshalling across processes of different types.

Now in principle, the DLL knows nothing about Perl, so doesn't "reach
out" in complex ways.  The functions in the DLL are wrapped
automatically using the XS generator.  However, that doesn't have enough
information to provide marshalling across different address spaces.  For
that you can just have "a pointer", but need to know how to deep-copy
it.  You would have to write a full MIDL description of the DLL's
interface.

--John






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