Interrogation de la classe WMI Win32_QuickFixEngineering renvoie des horodatages mucho weirdo (C#)

Question

Documentation de classe here. La propriété InstalledOn est supposée avoir un horodatage de (bien, duh) lorsque le correctif a été installé. Mais le doc ne dit pas quel est le format. Je reçois quelque chose d'inintelligible, mais cela signifie clairement quelque chose. "01ca56402c180b70" est très évident un nombre hexadécimal, mais de quoi?

Et une autre chose: pourquoi les premiers éléments ressemblent-ils à des GUID? Que signifient-ils?

Code Da:

ManagementScope scope; 
ConnectionOptions options = new ConnectionOptions(); 
options.Username = tbUsername.Text; 
options.Password = tbPassword.Password; 
options.Authority = String.Format("ntlmdomain:{0}", tbDomain.Text); 
scope = new ManagementScope(String.Format("\\\\{0}\\root\\cimv2", tbHost.Text), options); 
scope.Connect(); 
ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, new ObjectQuery("SELECT * FROM Win32_QuickFixEngineering")); 
foreach (ManagementObject queryObj in searcher.Get()) 
{ 
    wmiResults.Text += String.Format("{0} <{1}>: {2} (Installed {3} by '{4}')", 
            queryObj["HotFixID"], 
            queryObj["Caption"], 
            queryObj["Description"], 
            queryObj["InstalledOn"], 
            queryObj["InstalledBy"] 
            ); 
} 

sortie Da:

{87796B93-94D0-A0C7-EFC4-FF34426626BC} <>: (Installed 20090513 by '') 
{D93F9C7C-AB57-44C8-BAD6-1494674BCAF7} <>: (Installed 20090928 by '') 
{9AD2FB23-AC50-435C-8ABC-8119D29CF0C1} <>: (Installed 20090929 by '') 
{62D3B51B-F56D-40F0-8C32-EAB204ADF752} <>: (Installed 20090513 by '') 
{EC038F86-AC1E-4C30-AEFB-B6B8A3922DCD} <>: (Installed 20091116 by '') 
{D1219E04-62FF-49D0-804C-A27F968E50A5} <>: (Installed 20091116 by '') 
{1DE62EBA-6684-2483-3409-CEBADBF8A31E} <>: (Installed 20090513 by '') 
{8CA89076-2A6D-42C3-AA24-F203C9E5DBF3} <>: (Installed 20090513 by '') 
{F5E29D9D-519A-36C7-87E3-9A22A8180B1B} <>: (Installed 20091016 by '') 
KB948609 <http://support.microsoft.com/?kbid=948609>: Update (Installed 01c9d3cb9b46a87c by 'S-1-5-21-2756995651-916083937-3196967445-500') 
KB948610 <http://support.microsoft.com/?kbid=948610>: Update (Installed 01c9d3cb9b4909dd by 'S-1-5-21-2756995651-916083937-3196967445-500') 
KB951978 <http://support.microsoft.com/?kbid=951978>: Update (Installed 01ca408d02d6cdbe by 'S-1-5-18') 
KB952287 <http://support.microsoft.com/?kbid=952287>: Hotfix (Installed 01ca408d02d925c8 by 'S-1-5-18') 
KB954155 <http://support.microsoft.com/?kbid=954155>: Security Update (Installed 01ca56402c10e74d by 'S-1-5-18') 
KB955020 <http://support.microsoft.com/?kbid=955020>: Update (Installed 01ca408d02d925c8 by 'S-1-5-18') 
KB955302 <http://support.microsoft.com/?kbid=955302>: Update (Installed 01ca408d02db7dd2 by 'S-1-5-18') 
KB956250 <http://support.microsoft.com>: Update (Installed 01ca66e5e6fc6b70 by 'S-1-5-21-501351562-481299158-1019697294-11592') 
KB958481 <http://support.microsoft.com/?kbid=958481>: Update (Installed 01ca408d02db7dd2 by 'S-1-5-18') 
KB958483 <http://support.microsoft.com/?kbid=958483>: Update (Installed 01ca408d02ddd5dc by 'S-1-5-18') 
KB958644 <http://support.microsoft.com/?kbid=958644>: Security Update (Installed 01ca57f748bfe059 by 'S-1-5-21-2756995651-916083937-3196967445-500') 
KB958869 <http://support.microsoft.com/?kbid=958869>: Security Update (Installed 01ca56402c10e74d by 'S-1-5-18') 
KB959772 <http://support.microsoft.com/?kbid=959772>: Update (Installed 01ca408d02ddd5dc by 'S-1-5-18') 
KB968389 <http://support.microsoft.com/?kbid=968389>: Update (Installed 01ca408d02e02de6 by 'S-1-5-18') 
KB968816 <http://support.microsoft.com/?kbid=968816>: Security Update (Installed 01ca45c1ebfd041f by 'S-1-5-18') 
KB971486 <http://support.microsoft.com/?kbid=971486>: Security Update (Installed 01ca56402c1348ae by 'S-1-5-18') 
KB972594 <http://support.microsoft.com/?kbid=972594>: Security Update (Installed 01ca408d02e02de6 by 'S-1-5-18') 
KB973525 <http://support.microsoft.com/?kbid=973525>: Security Update (Installed 01ca56402c1348ae by 'S-1-5-18') 
KB974455 <http://support.microsoft.com/?kbid=974455>: Security Update (Installed 01ca56402c15aa0f by 'S-1-5-18') 
KB974571 <http://support.microsoft.com/?kbid=974571>: Security Update (Installed 01ca56402c15aa0f by 'S-1-5-18') 
KB975467 <http://support.microsoft.com/?kbid=975467>: Security Update (Installed 01ca56402c15aa0f by 'S-1-5-18') 
KB975517 <http://support.microsoft.com/?kbid=975517>: Security Update (Installed 01ca56402c180b70 by 'S-1-5-18') 

Answer 1

http://blogs.msdn.com/oldnewthing/archive/2003/09/05/54806.aspx donne les informations sur l'interprétation de différents types de timbres de temps. Il semble que vous ayez un Win32 FILETIME.

Answer 2

Installée < NTP TimeStamp > par '< Security Identifier >'

Au début de la chaîne sont horodatages NTP. Vous ne pouvez pas les transformer en un System.DateTime très facilement.

String s = "01c9d3cb9b46a87c"; 
DateTime dt = DateTime.FromFileTime(Int64.Parse(s, System.Globalization.NumberStyles.HexNumber)); 

Pour plus d'informations sur TimeStamps NTP, lisez la RFC (ne vous inquiétez pas, il est en fait un « court » RFC) à: http://www.faqs.org/rfcs/rfc958.html

A la fin de la chaîne sont des identifiants de sécurité pour les comptes Local System est 'S-1-5-18'.

Pour plus d'informations sur les identificateurs de sécurité, voir: http://technet.microsoft.com/en-us/library/cc780850%28WS.10%29.aspx