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;
 }

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