OS x64 Identification
in [Win32 Kernel]
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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: Brett on 8 Apr 2010 12:01 I do this a lot for detecting which driver (kernel mode app) to load. I've posted my stripped-down code below for both Win32 and .NET. *** For my Win32 apps *** DWORD CDriverMgr::GetID() { // We need to detect the correct OS version so we can load the right driver OSVERSIONINFO osv; osv.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); if(!GetVersionEx(&osv)) return 0; // Win95 = 4.0(Same as WinNT) // Win98 = 4.10 // WinME = 4.90 // WinNT = 4.0(Same as Win95) // Win2k = 5.0 // WinXP = 5.1 // WinXP64 = 5.2(Same as Win2003) // Win2003 = 5.2(Same as WinXP64) // WinVista = 6.0 // WinLH = 6.0 if(osv.dwPlatformId == 1) // WinME, Win98, Win95 return ID_WXP32; if(osv.dwMajorVersion == 4)// All the 32-bit non-Vista versions except XP return ID_WXP32; if(osv.dwMajorVersion == 5 && osv.dwMinorVersion != 2)// WinXP32 and Win2000 return ID_WXP32; // Anything else could be 64-bit, figure out if it is... if(!m_bIsWow64) // If we've already been through this and decided it's Wow64, then don't bother { if(!Is64Bit(&m_bIsWow64)) // If it errors out, it's most likely that it can't find that particular function (Win2k, 98, 95, ME, NT, etc...) m_bIsWow64 = FALSE; } if(osv.dwMajorVersion == 6) { if(m_bIsWow64) return ID_WV64; else return ID_WV32; } if(m_bIsWow64) return ID_WXP64; else return ID_WXP32; } inline BOOL CDriverMgr::Is64Bit(PBOOL pb64Bit) { *pb64Bit = FALSE; LPFN_ISWOW64PROCESS fnIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress(GetModuleHandle("kernel32"),"IsWow64Process"); if(fnIsWow64Process != NULL) { if(!fnIsWow64Process(GetCurrentProcess(), pb64Bit)) return FALSE; } else { *pb64Bit = FALSE; // If the function doesn't exist, then it's not 64-bit return TRUE; } return TRUE; } *** For .NET *** #region OS Detection and Driver Selection private enum DriverVersion { None, WindowsXP_32, WindowsXP_64, WindowsVista_32, WindowsVista_64 }; [StructLayout(LayoutKind.Sequential)] internal struct SYSTEM_INFO { public ushort wProcessorArchitecture; public ushort wReserved; public uint dwPageSize; public IntPtr lpMinimumApplicationAddress; public IntPtr lpMaximumApplicationAddress; public UIntPtr dwActiveProcessorMask; public uint dwNumberOfProcessors; public uint dwProcessorType; public uint dwAllocationGranularity; public ushort wProcessorLevel; public ushort wProcessorRevision; }; [DllImport("kernel32.dll")] internal static extern void GetNativeSystemInfo(ref SYSTEM_INFO lpSystemInfo); [DllImport("kernel32.dll")] internal static extern void GetSystemInfo(ref SYSTEM_INFO lpSystemInfo); private DriverVersion DetermineDriverVersion() { OperatingSystem osInfo = System.Environment.OSVersion; SYSTEM_INFO sysInfo = new SYSTEM_INFO(); switch (osInfo.Version.Major) { case 6: // Vista and Win7 GetNativeSystemInfo(ref sysInfo); if (sysInfo.wProcessorArchitecture == 9) // x64 return DriverVersion.WindowsVista_64; else // x86 or something else return DriverVersion.WindowsVista_32; case 5: // WinXP and Win2k if (osInfo.Version.Minor >= 1) // WinXP or later GetNativeSystemInfo(ref sysInfo); else GetSystemInfo(ref sysInfo); if (sysInfo.wProcessorArchitecture == 9) // x64 return DriverVersion.WindowsXP_64; else // x86 or something else return DriverVersion.WindowsXP_32; case 4: // WinNT4 Win98 WinME return DriverVersion.WindowsXP_32; default: break; } return DriverVersion.None; } #endregion "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. > > > . >
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.) |