-Original Message-
From: perl-win32-users-boun...@listserv.activestate.com
[mailto:perl-win32-users-boun...@listserv.activestate.com] On Behalf Of
Mark Dootson
Sent: 15 February 2011 03:39
To: Michael Cohen
Cc: perl-win32-users@listserv.ActiveState.com
Subject: Re: Invalid type 'Q' in pack
> Hi,
>
> There is no Q template for 32bit Perl as you have noticed.
>
> One solution may be
>
> define your struct as two DWORDS for each DWORD64, then split and join
> as necessary in your Perl code.
>
> 'pack' and 'unpack' are your friends in splitting / joining your
DWORD64
> / DWORDs
>
> If you could get at the pack / unpack inside Win32::API::Struct
> directly, then 'a8' would work as a replacement for 'Q' I think.
Spoken
> without testing of course.
>
> regards
>
> Mark
>
>
>
> On 15/02/2011 02:54, Michael Cohen wrote:
> > I am trying to replace an old and unsupported Win32 library. In
doing
> > so, I am attempting to get the following piece of code to work prior
to
> > adding it to my own library:
> >
> > Cut Here -
> > #!/usr/bin/perl -w
> > use strict;
> >
> > use Win32;
> > use Win32::API;
> >
> > Win32::API::Struct->typedef('MEMORYSTATUSEX', qw(
> > DWORD dwLength;
> > DWORD dwMemoryLoad;
> > DWORD64 ullTotalPhys;
> > DWORD64 ullAvailPhys;
> > DWORD64 ullTotalPageFile;
> > DWORD64 ullAvailPageFile;
> > DWORD64 ullTotalVirtual;
> > DWORD64 ullAvailVirtual;
> > DWORD64 ullAvailExtendedVirtual;
> > ));
> >
> > Win32::API->Import('kernel32',
> > 'BOOL GlobalMemoryStatusEx(LPMEMORYSTATUSEX lpBuffer)');
> >
> > # my $memoryInfo = Win32::API::Struct->new('MEMORYSTATUSEX');
> > tie my %memoryInfo, 'Win32::API::Struct', 'MEMORYSTATUSEX';
> >
> > my $rc = GlobalMemoryStatusEx(\%memoryInfo);
> >
> > printf ("TotalPhys = %d\n", $memoryInfo{ullTotalPhys});
> >
> > print ("Finished\n");
> >
> > Cut Here -
> >
> > When I try to run this program on a x86 version of ActivePerl 5.8.9
> > Build 828, I get the error:
> > Invalid type 'Q' in pack at C:/Perl/lib/Win32/API/Struct.pm line
230.
> > when it gets to line 25 (actual call of the Win32 API).
> >
> > Since I need to run this bit of code on both the 32-bit and 64-bit
> > Windows, how can I get this to work?
> >
> > API Info: http://msdn.microsoft.com/en-us/library/aa366589
I would say that it is primarily an issue with Win32::API::Type which
seems to specify Q/q as the template character for a number of types
that are (I think) valid for 32 bit windows. It should perhaps either
provide a suitable diagnostic if support for 64 bit integer values is
not available, or perform the necessary conversion. You might want to
take that up with the module's maintainer.
I don't know if it is possible/practical to build a 32 bit version of
Perl with support for 64 bit integers. That would either be a question
for Activestate, or you if you want to try building Perl yourself.
I agree with the Mark's suggested work around of using 2 DWORDs instead
of DWORD64, with some extra work at your end to combine them. I leave
determining the word order as an exercise for the reader, but you may
also want to consider using Math::BigInt to store the combined values,
just to be on the safe side.
HTH
--
Brian Raven
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