B20.1: typedef for DWORDLONG
Sun Feb 28 23:02:00 GMT 1999
From: firstname.lastname@example.org <email@example.com>
To: firstname.lastname@example.org <email@example.com>
Date: Friday, February 05, 1999 9:21 AM
Subject: B20.1: typedef for DWORDLONG
>I've never done Win32-based programming before and I'm having to modify
>someone else's NT 4.0 app to do some signal handling and noticed that
>while trying to compile with B20.1, their code uses DWORDLONG as a
>64-bit integer type (appears to be equiv to LONGLONG I think?). Thinking
>maybe it was just their bad programming, I pulled up MS's Visual C++
>5.0 and sure enough their code examples use DWORDLONG as a 64-bit
>integer type as well.
In the Microsoft Windows headers, a DWORDLONG is typedefed to be a
ULONGLONG, which is an unsigned __int64 (for the Microsoft compiler).
(You can find the definition in <winnt.h>, if you have a copy of the
For Cygwin this should do what you need:
typedef unsigned long long DWORDLONG;
>B20.1's windows32/base.h typedef's it as a double, which considering DWORD
>is an unsigned int, doesn't make sense to me. Am I missing something
>about the type assignments (coming from Linux development, it's weird
>not to use int, long, long long, but I'm trying not to re-type everything
>in this whole app just to work with B20.1 :)
>Hardware Design Engineer --- IBM Netfinity Performance Development
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It's typedefed as a double? Interesting... (It's been too long since I
looked at what Cygwin supported "out of the box"...)
There is a reason for this, however. LONGLONG and its family expect
a 64-bit integer. If the compiler doesn't support 64-bit integers,
(or more specifically, if the compiler doesn't support the __int64 type)
the fallback is to use a double, which is the same size (for use
in stack alignment, anyway).
I'm not sure why the GNU headers weren't updated to use a "long long"
instead of a double, though...
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