{"id":198,"date":"2013-10-26T17:21:10","date_gmt":"2013-10-26T17:21:10","guid":{"rendered":"http:\/\/wawszczak.pr0.pl\/?p=198"},"modified":"2014-07-04T11:04:03","modified_gmt":"2014-07-04T11:04:03","slug":"pobieranie-obiekt%c3%b3w-wmi-osadzonych-wewn%c4%85trz-innych-jako-zmienne-klas-c","status":"publish","type":"post","link":"https:\/\/wawszczak.pr0.pl\/en\/2013\/10\/26\/pobieranie-obiekt%c3%b3w-wmi-osadzonych-wewn%c4%85trz-innych-jako-zmienne-klas-c\/","title":{"rendered":"Retrieving properties embedded in WMI object (C#)"},"content":{"rendered":"

Hello,
\nToday fast review of rules for querying for embedded object within another WMI object.
\nBasic WMI search query returns collection of System<\/span>.<\/span>Management<\/span>.<\/span>ManagementObjectCollection<\/span><\/span><\/code>. This collection contains a set of System<\/span>.<\/span>Management<\/span>.<\/span>ManagementObject<\/span><\/span><\/code>. Each of them has filled in only a subset of all possible properties. This are those, what are simple WMI data types (String, Int, Bool). When we want to retrieve complex Class based property, the embedded object is missing and the code returns NULL value.
\nTo archieve filling in these object fields, there is class method called Get<\/span>(<\/span>)<\/span><\/span><\/code>
\nThis method is described here<\/a>. It can be used for quick retrieval of single object, but also it is used during handling any modification of object.
\nThe side effect is filling in the whole object including any embedded structured complex types instances.
\nFollowing code ilustrates the case:<\/p>\n

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<\/div><\/td>
\/\/ for kerberos konstrained delegation<\/span>
\nConnectionOptions wmiOptions =<\/span> new<\/span><\/a> ConnectionOptions(<\/span>)<\/span>;<\/span>
\nwmiOptions.<\/span>Authentication<\/span> =<\/span> AuthenticationLevel.<\/span>PacketPrivacy<\/span>;<\/span>
\nwmiOptions.<\/span>Impersonation<\/span> =<\/span> ImpersonationLevel.<\/span>Impersonate<\/span>;<\/span>
\n\/\/ for connection to remote host<\/span>
\nManagementScope scope =<\/span> new<\/span><\/a> ManagementScope(<\/span>"\\\\<\/span>\\"<\/span> + serverName + "<\/span>\\\\root\\\\SMS\\\\Site_" + siteCode, wmiOptions);
\n\/\/ for performing query to wmi
\nWqlObjectQuery wmiQuery = new WqlObjectQuery(query);
\nManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, wmiQuery);
\n\/\/ performing search itself
\nManagementObjectCollection Colls = searcher.Get();
\nManagementBaseObject[] rules = null;
\nManagementObject coll = null;
\n\/\/retrieving objects from collection, in this example we assume only one result
\nforeach (ManagementObject o in Colls)
\n{
\n   coll = o;
\n   \/\/ coll["<\/span>CollectionRules"] == null
\n   coll.Get();
\n   \/\/ after previous call it is filled in
\n   rules = (ManagementBaseObject[])o["<\/span>CollectionRules"];
\n}<\/span><\/div><\/td><\/tr><\/tbody><\/table><\/div>\n

<\/p>","protected":false},"excerpt":{"rendered":"

Hello, Today fast review of rules for querying for embedded object within another WMI object. Basic WMI search query returns collection of System.Management.ManagementObjectCollection. This collection contains a set of System.Management.ManagementObject. Each of them has filled in only a subset of … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[45,44],"tags":[46,48,47],"class_list":["post-198","post","type-post","status-publish","format-standard","hentry","category-programming","category-sccm-2012","tag-c","tag-sccm","tag-wmi"],"_links":{"self":[{"href":"https:\/\/wawszczak.pr0.pl\/en\/wp-json\/wp\/v2\/posts\/198","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wawszczak.pr0.pl\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wawszczak.pr0.pl\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wawszczak.pr0.pl\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wawszczak.pr0.pl\/en\/wp-json\/wp\/v2\/comments?post=198"}],"version-history":[{"count":11,"href":"https:\/\/wawszczak.pr0.pl\/en\/wp-json\/wp\/v2\/posts\/198\/revisions"}],"predecessor-version":[{"id":226,"href":"https:\/\/wawszczak.pr0.pl\/en\/wp-json\/wp\/v2\/posts\/198\/revisions\/226"}],"wp:attachment":[{"href":"https:\/\/wawszczak.pr0.pl\/en\/wp-json\/wp\/v2\/media?parent=198"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wawszczak.pr0.pl\/en\/wp-json\/wp\/v2\/categories?post=198"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wawszczak.pr0.pl\/en\/wp-json\/wp\/v2\/tags?post=198"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}