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From: cg on 8 Apr 2010 06:09
Hello,

I developp a win32 application and i want this application runs under
Windows Server 2008 x64 / x32 - Vista x64 / x32 - Seven x64 / x32, and i
need to make some modification for my application to be x64 perfectly
compliant.
My problem is : how to know if my application runs under an Os 64bits or
32bits.

I try the GetSystemInfo with the wProcessorArchitecture entry which
curiously return 0.

Curiously GetVersionEx can't be used.

Help would be grateful.

Chris.


From: Leo Davidson on 8 Apr 2010 06:50
On Apr 8, 11:09 am, "cg" <c...(a)nospam.fr> wrote:
> My problem is : how to know if my application runs under an Os 64bits or

Here's one way:

// From http://blogs.msdn.com/oldnewthing/archive/2005/02/01/364563.aspx
bool Is64BitWindows()
{
#if defined(_WIN64)
return true; // 64-bit programs run only on Win64
#elif defined(_WIN32)
// 32-bit programs run on both 32-bit and 64-bit Windows so must
sniff
BOOL f64 = FALSE;
return (::IsWow64Process(::GetCurrentProcess(), &f64) && f64);
#else
return false; // Win64 does not support Win16
#endif
}
From: Stefan Kuhr on 8 Apr 2010 07:14
Hello Chris,

On 4/8/2010 12:09 PM, cg wrote:
> Hello,
>
> I developp a win32 application and i want this application runs under
> Windows Server 2008 x64 / x32 - Vista x64 / x32 - Seven x64 / x32, and i
> need to make some modification for my application to be x64 perfectly
> compliant.
> My problem is : how to know if my application runs under an Os 64bits or
> 32bits.
>
> I try the GetSystemInfo with the wProcessorArchitecture entry which
> curiously return 0.
>
> Curiously GetVersionEx can't be used.
>
> Help would be grateful.
>
> Chris.
>
>

You might find the following snippet useful:

typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE hProcess,PBOOL
Wow64Process);


BOOL IsRunningUnderWow64(void)
{
BOOL bIsWow64 = FALSE;

#ifndef _WIN64
HMODULE hModKrn32 = GetModuleHandleW(L"kernel32");
LPFN_ISWOW64PROCESS fnIsWow64Process = NULL;
__analysis_assert(hModKrn32);
fnIsWow64Process =
(LPFN_ISWOW64PROCESS)GetProcAddress(hModKrn32,"IsWow64Process");

if (NULL != fnIsWow64Process)
{
if (!fnIsWow64Process(GetCurrentProcess(),&bIsWow64))
bIsWow64 = FALSE;
}
#endif // _WIN64

return bIsWow64;
}

From: Dee Earley on 9 Apr 2010 09:07
On 08/04/2010 11:09, cg wrote:
> Hello,
>
> I developp a win32 application and i want this application runs under
> Windows Server 2008 x64 / x32 - Vista x64 / x32 - Seven x64 / x32, and i
> need to make some modification for my application to be x64 perfectly
> compliant.

If your app is a 32bit app then it should work exactly as it did before.

> My problem is : how to know if my application runs under an Os 64bits or
> 32bits.
>
> I try the GetSystemInfo with the wProcessorArchitecture entry which
> curiously return 0.
>
> Curiously GetVersionEx can't be used.

I think it lies to your app if it's 32-bit. (It doesn't say in MSDN so I
can't say this definitively.)
If you compile a 64bit version you will get the correct answer.

--
Dee Earley (dee.earley(a)icode.co.uk)
i-Catcher Development Team

iCode Systems

(Replies direct to my email address will be ignored.
Please reply to the group.)
From: RichK on 9 Apr 2010 10:51
A call to

IsWow64Process(GetCurrentProcess(),&bIsWow64);

should return success and set bIsWow64 to a non-zero value when it is called
from a 32-bit process that is running on an x64 edition of Windows.



"Dee Earley" <dee.earley(a)icode.co.uk> wrote in message
news:4bbf21b3$0$344$7b0f0fd3(a)reader.news.newnet.co.uk...
> On 08/04/2010 11:09, cg wrote:
>> Hello,
>>
>> I developp a win32 application and i want this application runs under
>> Windows Server 2008 x64 / x32 - Vista x64 / x32 - Seven x64 / x32, and i
>> need to make some modification for my application to be x64 perfectly
>> compliant.
>
> If your app is a 32bit app then it should work exactly as it did before.
>
>> My problem is : how to know if my application runs under an Os 64bits or
>> 32bits.
>>
>> I try the GetSystemInfo with the wProcessorArchitecture entry which
>> curiously return 0.
>>
>> Curiously GetVersionEx can't be used.
>
> I think it lies to your app if it's 32-bit. (It doesn't say in MSDN so I
> can't say this definitively.)
> If you compile a 64bit version you will get the correct answer.
>
> --
> Dee Earley (dee.earley(a)icode.co.uk)
> i-Catcher Development Team
>
> iCode Systems
>
> (Replies direct to my email address will be ignored.
> Please reply to the group.)


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