windows驱动获取系统版本信息 PsGetVersion RtlGetVersion

驱动获取系统版本信息有2个函数，分别是PsGetVersion RtlGetVersion
PsGetVersion在XP后已经不建议使用，

/*Returns the windows version we're running on*/
vboxWinVersion_t VBoxQueryWinVersion()
{
    ULONG major, minor, build;
    BOOLEAN checkedBuild;
    static vboxWinVersion_t s_WinVersion = UNKNOWN_WINVERSION;

    if (s_WinVersion != UNKNOWN_WINVERSION)
        return s_WinVersion;

    checkedBuild = PsGetVersion(&major, &minor, &build, NULL);
    LOG(("running on version %d.%d, build %d(checked=%d)", major, minor, build, (int)checkedBuild));

    if(major == 6)
    {
        if (minor == 3)
            s_WinVersion = WIN81;
        else if (minor == 2)
            s_WinVersion = WIN8;
        else if (minor == 1)
            s_WinVersion = WIN7;
        else if (minor == 0)
            s_WinVersion = WINVISTA; /* Or Windows Server 2008. */
    }
    else if (major == 5)
        s_WinVersion = (minor>=1) ? WINXP:WIN2K;
    else if (major == 4)
        s_WinVersion = WINNT4;
    else
        WARN(("NT4 required!"));
    return s_WinVersion;
}