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POUnderstanding the WMI object path format
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  1. POUnderstanding the WMI object path format
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    copied!<p>I want to write a class with similar funcionality as the .NET <a href="http://msdn.microsoft.com/en-us/library/1ktaf6fk.aspx" rel="nofollow"><code>ManagementPath</code></a> class. On <a href="http://msdn.microsoft.com/en-us/library/aa394566%28v=VS.85%29.aspx" rel="nofollow">MSDN</a> is a set of articles which handles the format of object paths. However, I don't understand it yet with all special cases</p> <ul> <li><p>String comparisons that deal with object paths are always case-insensitive. ==> does this also apply to the values of keys when querying for object instances?</p></li> <li><p>Hexadecimal constants for integers. ==> where can they occur? in values of keys only?</p></li> <li><p>Boolean constants for classes with keys that take Boolean values. ==> what are the constants? true / false? 0 / 1?</p></li> <li><p>An assumed local server with a partial namespace path. Thus, specifying the root and default namespace implies the root and default namespace on the local server. ==> does this <em>only</em> mean that if I don't specify a server, that then "." is used as server?</p></li> <li><p>No white space either within an element or between elements. ==> why does the original .NET implementation allow spaces in server names then?</p></li> <li><p>Embedded quotation marks in object paths are allowed but must delimit the quotation mark with escape characters, as in a C or C++ application. ==> ???</p></li> <li><p>Only decimal values are recognized as numeric portions of keys. ==> ???</p></li> <li><p>Everything on this page: <a href="http://msdn.microsoft.com/en-us/library/aa389223(v=VS.85).aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/aa389223(v=VS.85).aspx</a> ==> ?</p></li> </ul> <p>Well, the basic paths that I think are valid look like</p> <pre><code>\\Server\Namespace \Namespace \\Server\Namespace:Class \Namespace:Class Class \\Server\Namespace:Class.KeyName=KeyValue \Namespace:Class.KeyName=KeyValue Class.KeyName=KeyValue \\Server\Namespace:Class=KeyValue \Namespace:Class=KeyValue Class=KeyValue \\Server\Namespace:Class.FirstKey=FirstValue,SecondKey=SecondValue \Namespace:Class.FirstKey=FirstValue,SecondKey=SecondValue Class.FirstKey=FirstValue,SecondKey=SecondValue \\Server\Namespace:Class=@ \Namespace:Class=@ Class=@ as well as all combinations were the \\ is replaced by a // and/or the \ between server and namespace is replaced by / </code></pre> <p>Have I forgotten anything here?</p> <p>This is what can be extracted from MSDN. However, how may the individual tokens look like? This is what I <strong>think</strong> it may be:</p> <pre><code>KeyValue = "string" &lt;-- string 1 &lt;-- numeric 0x1 &lt;-- hex ?????????? &lt;-- about the "decimal value" thing and "embedded quitation mark" thing. Also, what about whitespaces? do they have to be abreviated by %20? KeyName / Class / Server = string without : or / or \ inside and maybe only [a-z0-9_] ? Namespace = string without : or / inside and maybe only [a-z0-9_\] (.NET implementation also buggy here. accepts forward slashes regardless of "You cannot use forward slashes within namespace names." on MSDN) Also, are they allowed to start with \ and end with a : ? </code></pre> <p>It would be very helpful if for each token a regular expression could be given of how it looks like.</p>
 

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