PowerShell for Windows Admins

Sep 1 2013   4:57AM GMT

Find the key of a WMI class

Richard Siddaway Richard Siddaway Profile: Richard Siddaway

At least one property of a WMI class will be marked as a key. This information is held in the property Qualifiers which is a collection of data. The key is needed if you need to create an instance of the class. I’ve shown how to find the key with Get-WmiObject before but not with the new CIM cmdlets.

Its actually easier with the CIM cmdlets

$class = Get-CimClass -ClassName Win32_Process

foreach ($property in $class.CimClassProperties) {

$property | select -ExpandProperty Qualifiers |
foreach {
if ($_.Name -eq ‘key’){
$property
}
}

}

Get the CIM class. Iterate over the properties and expand the Qualifiers of the property. Check the names of the qualifiers for key & when you find it print out the property data

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