得到当前操作系统的版本的

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

#define BUFSIZE 80

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

switch (osvi.dwPlatformId)
{
// Test for the Windows NT product family.
case VER_PLATFORM_WIN32_NT:

// Test for the specific product family.
if ( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 2 )
printf ("Microsoft Windows Server 2003 family, ");

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 )
{
if( osvi.dwMajorVersion == 4 )
printf ( "Workstation 4.0 " );
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( 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 " );
}
}
}
else // Test for specific product on Windows NT 4.0 SP5 and earlier
{
HKEY hKey;
char szProductType[BUFSIZE];
DWORD dwBufLen=BUFSIZE;
LONG lRet;

lRet = RegOpenKeyEx( HKEY_LOCAL_MACHINE,
"SYSTEM//CurrentControlSet//Control//ProductOptions",
0, KEY_QUERY_VALUE, &hKey );
if( lRet != ERROR_SUCCESS )
return FALSE;

lRet = RegQueryValueEx( hKey, "ProductType", NULL, NULL,
(LPBYTE) szProductType, &dwBufLen);
if( (lRet != ERROR_SUCCESS) || (dwBufLen > BUFSIZE) )
return FALSE;

RegCloseKey( hKey );

if ( lstrcmpi( "WINNT", szProductType) == 0 )
printf( "Workstation " );
if ( lstrcmpi( "LANMANNT", szProductType) == 0 )
printf( "Server " );
if ( lstrcmpi( "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, "Service Pack 6" ) == 0 )
{
HKEY hKey;
LONG lRet;

// Test for SP6 versus SP6a.
lRet = RegOpenKeyEx( HKEY_LOCAL_MACHINE,
"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 & 0xFFFF );
else // Windows NT 4.0 prior to SP6a
{
printf( "%s (Build %d)/n",
osvi.szCSDVersion,
osvi.dwBuildNumber & 0xFFFF);
}

RegCloseKey( hKey );
}
else // Windows NT 3.51 and earlier or Windows 2000 and later
{
printf( "%s (Build %d)/n",
osvi.szCSDVersion,
osvi.dwBuildNumber & 0xFFFF);
}

break;

// Test for the Windows 95 product family.
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 Millennium Edition/n");
}
break;

case VER_PLATFORM_WIN32s:

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