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OS version detection for 32 and 64 bit OS.

Discussion in 'Win32' started by shabbir, Sep 26, 2006.

  1. shabbir

    shabbir Administrator Staff Member

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    I needed to check the OS and on different OS the different path needed to be followed and so the host operating system version was needed for an application I was developing.

    Background



    First I would like to make a table where we know what are the platformId, MajorVersion, MinorVersion of each of the Window'sOS. Here are the PlatformId, Major and Minor Version Numbers of the 32-bit Windows operating systems Table
    Code:
    +----------+------------+-------+-------+
    | Version  | PlatformId | Major | Minor |
    +----------+------------+-------+-------+
    | Win95    |      1     |   4   |   0   |
    | Win98    |      1     |   4   |  10   |
    | WinME    |      1     |   4   |  90   |
    | WinNT351 |      2     |   3   |  51   |
    | WinNT4   |      2     |   4   |   0   |
    | Win2000  |      2     |   5   |   0   |
    | WinXP    |      2     |   5   |   1   |
    | Win2003  |      2     |   5   |   2   |
    | WinCE    |      3     |   ?   |   ?   |
    | WinLH    |      2     |   6   |   0   |
    +----------+------------+-------+-------+
    

    Coding



    Now lets begin the OS detection code and for that we need some constants. Lets define the constants first
    Code:
    typedef enum OSVersion
    {
        WIN95 = 1,
        WIN98 = 2,
        WINME = 3,
        WINNT351 = 4,
        WINNT4 = 5,
        WIN2000 = 6,
        WINXP = 7,
        WIN2003 = 8,
        WINCE = 9,
        WINLH = 10,
        WIN64BIT = 11
    } OS_VERSION;
    Now lets write a general routine to detect the OS. Here is the function to detect the OS.
    Code:
    OS_VERSION GetHostOS()
    {
    	BOOL bIs64BitOS = FALSE;
    	BOOL bIsWin95 = FALSE;
    	BOOL bIsWin98 = FALSE;
    	BOOL bIsWinME = FALSE;
    	BOOL bIsWinNT351 = FALSE;
    	BOOL bIsWinNT4 = FALSE;
    	BOOL bIsWin2000 = FALSE;
    	BOOL bIsWinXP = FALSE;
    	BOOL bIsWin2003 = FALSE;
    	BOOL bIsWinLH = FALSE;
    	
    	// We check if the OS is 64 Bit
    	typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);
    
    	LPFN_ISWOW64PROCESS 
    	fnIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress(
    	GetModuleHandle("kernel32"),"IsWow64Process");
     
    	if (NULL != fnIsWow64Process)
    	{
    		if (!fnIsWow64Process(GetCurrentProcess(),&bIs64BitOS))
    		{
    			// handle error
    		}
    	}
    
    	OSVERSIONINFO osvi;
    	osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
    	::GetVersionEx( &osvi );
    	
    	bIsWin95 =
    	   (osvi.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) &&
    	   (osvi.dwMajorVersion == 4) &&
    	   (osvi.dwMinorVersion == 0);
    
    	bIsWin98 =
     	   (osvi.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) &&
    	   (osvi.dwMajorVersion == 4) &&
    	   (osvi.dwMinorVersion == 10);
    
    	bIsWinME = 
    	   (osvi.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) &&
    	   (osvi.dwMajorVersion == 4) &&
    	   (osvi.dwMinorVersion == 90); 
    
    	bIsWinNT351 = 
    	   (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) &&
    	   (osvi.dwMajorVersion == 3) &&
    	   (osvi.dwMinorVersion == 51);
    
    	bIsWinNT4 = 
    	   (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) &&
    	   (osvi.dwMajorVersion == 4) &&
    	   (osvi.dwMinorVersion == 0);
    
    	bIsWin2000 = 
    	   (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) &&
    	   (osvi.dwMajorVersion == 5) &&
    	   (osvi.dwMinorVersion == 0);
    
    	bIsWinXP = 
    	   (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) &&
    	   (osvi.dwMajorVersion == 5) &&
    	   (osvi.dwMinorVersion == 1);
    
    	bIsWin2003 = 
    	   (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) &&
    	   (osvi.dwMajorVersion == 5) &&
    	   (osvi.dwMinorVersion == 2);
    
    	bIsWinLH = 
    	    (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) &&
    	    (osvi.dwMajorVersion == 6);
    
    	if( bIs64BitOS ) return WIN64BIT;
    	if( bIsWin95 ) return WIN95;
    	if( bIsWin98 ) return WIN98;
    	if( bIsWinME ) return WINME;
    	if( bIsWinNT351 ) return WINNT351;
    	if( bIsWinNT4 ) return WINNT4;
    	if( bIsWin2000 ) return WIN2000;
    	if( bIsWinXP ) return WINXP;
    	if( bIsWin2003 ) return WIN2003;
    	if( bIsWinLH ) return WINLH;
    
    	return WINXP;
    }
    I have skipped the WINCE but that can be easily added with the help of the above table.
     

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  2. aisha.ansari84

    aisha.ansari84 New Member

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    wow something like this is also possible
     
  3. rahul.mca2001

    rahul.mca2001 New Member

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    i tried it works
     
  4. Farrukh

    Farrukh New Member

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    I'm trying to download OsVersion.zip, but it is downloading as "attachment.php" and when I rename it to OsVersion.zip, it is found corrupted. :(
     
  5. Farrukh

    Farrukh New Member

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    But on the 2nd try, I downloaded and renamed to zip and it worked fine :)

    Going to try that
     
  6. msdnguide

    msdnguide New Member

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    On solaris there is a command called isainfo that describe instruction set architectures. It will tell if OS is in 32 bit or 64 bit
     
  7. xiaochunjie

    xiaochunjie New Member

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    thank you .

    this is a nice code.
     

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