Win2000 or Win98以上かどうかを調査

static bool IsWinNT5orWin98()

{

    bool bNT5orWin98 = false;

    OSVERSIONINFO version;

    memset(&version, 0, sizeof(version));

    version.dwOSVersionInfoSize = sizeof(version);

    ::GetVersionEx(&version);

    if(version.dwPlatformId == VER_PLATFORM_WIN32_NT)

    {

        if(version.dwMajorVersion >= 5)

        {

            bNT5orWin98 = true;

        }

    }

    else if(version.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)

    {

        if((version.dwMajorVersion > 4) || ((version.dwMajorVersion == 4) && 

            (version.dwMinorVersion > 0)))

        {

            bNT5orWin98 = true;

        }

    }

    return bNT5orWin98;

}