Determine the Windows operating system version

From msdn:

# Include <windows. h>
# Include <tchar. h>
# Include <stdio. h>

# Define bufsize 80

Typedef void (winapi * pgnsi) (lpsystem_info );

Int _ tmain ()
{
Osversioninfoex osvi;
System_info Si;
Pgnsi;
Bool bosversioninfoex;

Zeromemory (& Si, sizeof (system_info ));
Zeromemory (& osvi, sizeof (osversioninfoex ));

// Try calling getversionex using the osversioninfoex structure.
// If that fails, try using the osversioninfo structure.

Osvi. dwosversioninfosize = sizeof (osversioninfoex );

If (! (Bosversioninfoex = getversionex (osversioninfo *) & osvi )))
{
Osvi. dwosversioninfosize = sizeof (osversioninfo );
If (! Getversionex (osversioninfo *) & osvi ))
Return false;
}

// Call getnativesysteminfo if supported or getsysteminfo otherwise.

Pgnsi = (pgnsi) getprocaddress (
Getmodulehandle (text ("kernel32.dll ")),
"Getnativesysteminfo ");
If (null! = Pgnsi)
Pgnsi (& Si );
Else getsysteminfo (& Si );

Switch (osvi. dwplatformid)
{
// Test for the Windows NT product family.

Case ver_platform_win32_nt:

// Test for the specific product.

If (osvi. dwmajorversion = 6 & osvi. dwminorversion = 0)
{
If (osvi. wproducttype = ver_nt_workstation)
Printf ("Microsoft Windows Vista ");
Else printf ("Windows Server \" Longhorn \"");
}

If (osvi. dwmajorversion = 5 & osvi. dwminorversion = 2)
{
If (getsystemmetrics (sm_serverr2 ))
Printf ("Microsoft Windows Server 2003 \" R2 \"");
Else if (osvi. wproducttype = ver_nt_workstation &&
Si. wprocessorarchitecture = processor_ubunture_amd64)
{
Printf ("Microsoft Windows XP Professional x64 Edition ");
}
Else printf ("Microsoft Windows Server 2003 ,");
}

If (osvi. dwmajorversion = 5 & osvi. dwminorversion = 1)
Printf ("Microsoft Windows XP ");

If (osvi. dwmajorversion = 5 & osvi. dwminorversion = 0)
Printf ("Microsoft Windows 2000 ");

If (osvi. dwmajorversion <= 4)
Printf ("Microsoft Windows NT ");

// Test for specific product on Windows NT 4.0 SP6 and later.
If (bosversioninfoex)
{
// Test for the workstation type.
If (osvi. wproducttype = ver_nt_workstation &&
Si. wprocessorarchitecture! = Processor_ubunture_amd64)
{
If (osvi. dwmajorversion = 4)
Printf (& quot; Workstation 4.0 & quot ");
Else if (osvi. wsuitemask & ver_suite_personal)
Printf ("Home Edition ");
Else printf ("professional ");
}

// Test for the server type.
Else if (osvi. wproducttype = ver_nt_server |
Osvi. wproducttype = ver_nt_domain_controller)
{
If (osvi. dwmajorversion = 5 & osvi. dwminorversion = 2)
{
If (Si. wprocessorarchitecture = processor_ubunture_ia64)
{
If (osvi. wsuitemask & ver_suite_datacenter)
Printf ("datacenter edition for itanium-based systems ");
Else if (osvi. wsuitemask & ver_suite_enterprise)
Printf ("Enterprise Edition for itanium-based systems ");
}

Else if (Si. wprocessorarchitecture = processor_ubunture_amd64)
{
If (osvi. wsuitemask & ver_suite_datacenter)
Printf ("datacenter x64 Edition ");
Else if (osvi. wsuitemask & ver_suite_enterprise)
Printf ("Enterprise x64 Edition ");
Else printf ("Standard x64 Edition ");
}

Else
{
If (osvi. wsuitemask & ver_suite_datacenter)
Printf ("datacenter edition ");
Else if (osvi. wsuitemask & ver_suite_enterprise)
Printf ("Enterprise Edition ");
Else if (osvi. wsuitemask = ver_suite_blade)
Printf ("web edition ");
Else printf ("Standard Edition ");
}
}
Else if (osvi. dwmajorversion = 5 & osvi. dwminorversion = 0)
{
If (osvi. wsuitemask & ver_suite_datacenter)
Printf ("datacenter server ");
Else if (osvi. wsuitemask & ver_suite_enterprise)
Printf ("Advanced Server ");
Else printf ("server ");
}
Else // Windows NT 4.0
{
If (osvi. wsuitemask & ver_suite_enterprise)
Printf ("Server 4.0, Enterprise Edition ");
Else printf ("Server 4.0 ");
}
}
}
// Test for specific product on Windows NT 4.0 SP5 and earlier
Else
{
Hkey;
Tchar szproducttype [bufsize];
DWORD dwbuflen = bufsize * sizeof (tchar );
Long LRET;

LRET = regopenkeyex (HKEY_LOCAL_MACHINE,
Text ("System \ CurrentControlSet \ Control \ productoptions "),
0, key_query_value, & hkey );
If (LRET! = Error_success)
Return false;

LRET = regqueryvalueex (hkey, text ("producttype"), null, null,
(Lpbyte) szproducttype, & dwbuflen );
Regclosekey (hkey );

If (LRET! = Error_success) | (dwbuflen> bufsize * sizeof (tchar )))
Return false;

If (lstrcmpi (text ("winnt"), szproducttype) = 0)
Printf ("workstation ");
If (lstrcmpi (text ("lanmannt"), szproducttype) = 0)
Printf ("server ");
If (lstrcmpi (text ("servernt"), szproducttype) = 0)
Printf ("Advanced Server ");
Printf ("% d. % d", osvi. dwmajorversion, osvi. dwminorversion );
}

// Display Service Pack (if any) and build number.

If (osvi. dwmajorversion = 4 &&
Lstrcmpi (osvi. szcsdversion, text ("Service Pack 6") = 0)
{
Hkey;
Long LRET;

// Test for SP6 versus SP6a.
LRET = regopenkeyex (HKEY_LOCAL_MACHINE,
Text ("SOFTWARE \ Microsoft \ Windows NT \ CurrentVersion \ Hotfix \ q246009 "),
0, key_query_value, & hkey );
If (LRET = error_success)
Printf ("Service Pack 6a (build % d) \ n ",
Osvi. dwbuildnumber & 0 xFFFF );
Else // Windows NT 4.0 prior to SP6a
{
_ Tprintf (text ("% s (build % d) \ n "),
Osvi. szcsdversion,
Osvi. dwbuildnumber & 0 xFFFF );
}

Regclosekey (hkey );
}
Else // not Windows NT 4.0
{
_ Tprintf (text ("% s (build % d) \ n "),
Osvi. szcsdversion,
Osvi. dwbuildnumber & 0 xFFFF );
}

Break;

// Test for the Windows ME/98/95.
Case ver_platform_win32_windows:

If (osvi. dwmajorversion = 4 & osvi. dwminorversion = 0)
{
Printf ("Microsoft Windows 95 ");
If (osvi. szcsdversion [1] = 'C' | osvi. szcsdversion [1] = 'B ')
Printf ("osr2 ");
}

If (osvi. dwmajorversion = 4 & osvi. dwminorversion = 10)
{
Printf ("Microsoft Windows 98 ");
If (osvi. szcsdversion [1] = 'A' | osvi. szcsdversion [1] = 'B ')
Printf ("se ");
}

If (osvi. dwmajorversion = 4 & osvi. dwminorversion = 90)
{
Printf ("Microsoft Windows Millennium Edition \ n ");
}
Break;

Case ver_platform_win32s:

Printf ("Microsoft win32s \ n ");
Break;
}
Return true;
}