VC++获取操作系统版本（摘自MSDN)

#include <windows.h>
#include <stdio.h>

BOOL DisplaySystemVersion()
{
OSVERSIONINFOEX osvi;
BOOL bOsVersionInfoEx;

// Try calling GetVersionEx using the OSVERSIONINFOEX structure.
//
// If that fails, try using the OSVERSIONINFO structure.

ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);

if( !(bOsVersionInfoEx = GetVersionEx ((OSVERSIONINFO *) &osvi)) )
{
// If OSVERSIONINFOEX doesn't work, try OSVERSIONINFO.

osvi.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
if (! GetVersionEx ( (OSVERSIONINFO *) &osvi) )
return FALSE;
}

switch (osvi.dwPlatformId)
{
case VER_PLATFORM_WIN32_NT:

// Test for the product.

if ( osvi.dwMajorVersion <= 4 )
printf("Microsoft Windows NT ");

if ( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 0 )
printf ("Microsoft Windows 2000 ");

if ( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 1 )
printf ("Microsoft Windows XP ");

// Test for product type.

if( bOsVersionInfoEx )
{
if ( osvi.wProductType == VER_NT_WORKSTATION )
{
if( osvi.wSuiteMask & VER_SUITE_PERSONAL )
printf ( "Personal " );
else
printf ( "Professional " );
}

else if ( osvi.wProductType == VER_NT_SERVER )
{
if( osvi.wSuiteMask & VER_SUITE_DATACENTER )
printf ( "DataCenter Server " );
else if( osvi.wSuiteMask & VER_SUITE_ENTERPRISE )
printf ( "Advanced Server " );
else
printf ( "Server " );
}
}
else
{
HKEY hKey;
char szProductType[80];
DWORD dwBufLen;

RegOpenKeyEx( HKEY_LOCAL_MACHINE,
"SYSTEM//CurrentControlSet//Control//ProductOptions",
0, KEY_QUERY_VALUE, &hKey );
RegQueryValueEx( hKey, "ProductType", NULL, NULL,
(LPBYTE) szProductType, &dwBufLen);
RegCloseKey( hKey );
if ( lstrcmpi( "WINNT", szProductType) == 0 )
printf( "Professional " );
if ( lstrcmpi( "LANMANNT", szProductType) == 0 )
printf( "Server " );
if ( lstrcmpi( "SERVERNT", szProductType) == 0 )
printf( "Advanced Server " );
}

// Display version, service pack (if any), and build number.

if ( osvi.dwMajorVersion <= 4 )
{
printf ("version %d.%d %s (Build %d)/n",
osvi.dwMajorVersion,
osvi.dwMinorVersion,
osvi.szCSDVersion,
osvi.dwBuildNumber & 0xFFFF);
}
else
{
printf ("%s (Build %d)/n",
osvi.szCSDVersion,
osvi.dwBuildNumber & 0xFFFF);
}
break;

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' )
printf("SE " );
}

if (osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 90)
{
printf ("Microsoft Windows Me ");
}
break;

case VER_PLATFORM_WIN32s:

printf ("Microsoft Win32s ");
break;
}
return TRUE;
}