[Mingw-users] [Mingw-w64-public] x64 can't cast ptr to DWORD

[Jim M. <jmi...@ya...>]

it's 32-bit windows 9x code, but the target is 64-bit, so I have to disable the 9x code.
I found a workaround on the internet (great place to look for solutions):
#if !defined(_WIN64)
...//win9x code
#endif




________________________________
From: Ozkan Sezer <se...@gm...>
To: Jim Michaels <jmi...@ya...>
Cc: mingw64 <min...@li...>
Sent: Fri, February 19, 2010 1:28:02 AM
Subject: Re: [Mingw-w64-public] x64 can't cast ptr to DWORD

On Fri, Feb 19, 2010 at 11:25 AM, Jim Michaels <jmi...@ya...> wrote:
> after much difficulty trying to get subscribed to the list, here is my
> question.
>
> #define CAST(x) reinterpret_cast<DWORD>( x )
> or
> #define CAST(x) (DWORD)( x )
> ...
>     // All msdos data structures must be packed on a 1 byte boundary
>     #pragma pack (1)
>     struct {
>       DWORD StartingSector ;
>       WORD NumberOfSectors ;
>       DWORD pBuffer;
>     } ControlBlock;
>     #pragma pack ()
> ...
>       ControlBlock.pBuffer = CAST(buffer) ;
>
> "dgeomlib.cpp:178: error: cast from 'unsigned char*' to 'DWORD' loses
> precision"
>
> this only occurs on 64-bit target compiler.
> how can I circumvent?

Use DWORD_PTR instead.

> or, how can I use ifdefs to disable this windows 9x code only for x64 target
> (obviously the x64-output compiler must have some sort of #define?)?
>

#ifdef _WIN64 ... #endif  should do?

>
> Jim Michaels
> jmi...@ya...(main)
> JesusnJim.com (my site)

--
Ozkan
I don't think it's going to fit in 32 bits.