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Postings from February 2012
This is RT#74578 about Win32::API structs packing/unpacking.
Can you help us?
------- Forwarded message -------
From: "Douglas Wilson via RT" <bug-Win32-API@rt.cpan.org>
Subject: [rt.cpan.org #74578] Win32::API::Struct not aligned on 64 bit
Date: Wed, 01 Feb 2012 17:27:37 +0100
Queue: Win32-API
Ticket <URL: https://rt.cpan.org/Ticket/Display.html?id=74578 >
On Wed Feb 01 02:15:26 2012, COSIMO wrote:
> Hi Doug, thanks for filing this.
>
> What do to about it?
> Not sure, other than CC'ing libwin32@perl.org as you did.
Cool, I didn't know RT cc'd the mailing list (maybe someone else will
know what to do). What I've done is hack Struct.pm getPack() and
getUnpack():
in getPack():
$type_align = (($packed_size + $type_size) % $type_size);
# $packing .= "x" x $type_align . $type;
$packing .= $type;
$packed_size += $type_size;
# $packed_size += $type_size + $type_align;
}
in getUnpack():
$type_align = (($packed_size + $type_size) % $type_size);
# $packing .= "x" x $type_align . $type;
$packing .= $type;
# $packed_size += $type_size + $type_align;
$packed_size += $type_size;
push(@items, $name);
}
Perhaps if this change were wrapped in is_64bit() type logic, then it
would work everywhere? I don't know enough about this to really know for
sure, and I'm not even sure if I haven't broken something else. And if
this change is headed in the right direction, there should probably be
some changes to the align() and sizeof() methods.
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