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CIM references and associations

Posted by: | April 24, 2018 Comments Off on CIM references and associations |

Way back in 2011, when I were just a young lad, I wrote about WMI or CIM references and associations – https://wordpress.com/read/blogs/16267735/posts/1673

ASSOCIATORS show the end point of the link between CIM classes and REFERENCES shows the linking class.

I used the Win32_NetworkAdapter class in the example because it has a known association with Win32_NetworkAdapterConfiguration.


One thing I appear to have not made clear is that you have to use the key to the CIM class in the query for the reference or association. The key for a Win32_networkadapter class is DeviceID.

This became clear when a reader pointed out that this won’t work:

PS> Get-WmiObject -Query “REFERENCES OF {win32_printer.name = ‘fax’}”
Get-WmiObject : Invalid object path
At line:1 char:1
+ Get-WmiObject -Query “REFERENCES OF {win32_printer.name = ‘fax’}”
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [Get-WmiObject], ManagementException
+ FullyQualifiedErrorId : GetWMIManagementException,Microsoft.PowerShell.Commands.GetWmiObjectCommand


But that

Get-WmiObject -Query “REFERENCES OF {Win32_Printer.DeviceID=’Fax’}”

works. Again DeviceId is the key to the class.


Usually its better to go straight to the association and bypass the reference.

A better approach than writing WQL queries is to use the CIM cmdlets

$p = Get-CimInstance -ClassName Win32_Printer -Filter “Name=’Fax'”

Get-CimAssociatedInstance -InputObject $p

will show you the data from the associated classes.


If you just want to see the associated class names

PS> Get-CimAssociatedInstance -InputObject $p | select CIMclass



And if you just want the data for a particular associated class

PS> Get-CimAssociatedInstance -InputObject $p -ResultClassName Win32_PrinterDriver

Caption :
Description :
InstallDate :
Name : Microsoft Shared Fax Driver,3,Windows x64
Status :
CreationClassName : Win32_PrinterDriver
Started :
StartMode :
SystemCreationClassName : Win32_ComputerSystem
SystemName :
ConfigFile : C:\WINDOWS\system32\spool\DRIVERS\x64\3\FXSUI.DLL
DataFile : C:\WINDOWS\system32\spool\DRIVERS\x64\3\FXSUI.DLL
DefaultDataType :
DependentFiles : {C:\WINDOWS\system32\spool\DRIVERS\x64\3\FXSWZRD.DLL,
DriverPath : C:\WINDOWS\system32\spool\DRIVERS\x64\3\FXSDRV.DLL
FilePath :
HelpFile :
InfName :
MonitorName :
OEMUrl :
SupportedPlatform : Windows x64
Version : 3
PSComputerName :

under: PowerShell and CIM

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