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Problem mapping NDIS OID to WMI class

Shane_CorbinShane_Corbin Member Posts: 270

I have an NDIS miniport driver that I'm creating a couple custom WMI classes for. I have done the following:

  • Created a .mof to describe them
  • Compiled the .mof and referenced it in the .rc
  • Created the .h for my classes
  • Created 2 new OID definitions (starting with 0xFF)
  • Created NDIS_GUID entries that map my OID to the GUID defined in my .mof
  • Return my new NDIS_GUID entries from OID_GEN_SUPPORTED_GUIDS

When running !ndiskd.miniport ffffe605e3f1b1a0 -wmi I see my custom GUIDs like so:

    771a0e47-c82a-43bb-b54e-cccba588a4XX   OID 0xffXXXf01
                       OID, CUSTOM
    23588cf4-2a05-4e5e-9aa0-d005990fa8XX   OID 0xffXXXf02
                       OID, CUSTOM

I replaced a couple values with XX when posting so they don't get copy/pasted somewhere in the wild

Then I followed Jeffrey's handy write-up to try to find my WMI class by doing:

Get-WmiObject -Namespace root\wmi -List  |
    Where-Object {$_.Qualifiers['guid'].Value -eq '{771a0e47-c82a-43bb-b54e-cccba588a4XX}' }

However, nothing gets found. I double checked that this works by doing ! GUID_NDIS_GEN_VENDOR_ID which resulted in:


When running the WMI query using that GUID as follows, everything works:

Get-WmiObject -Namespace root\wmi -List  |
    Where-Object {$_.Qualifiers['guid'].Value -eq '{5ec1035e-a61a-11d0-8dd4-00c04fc3358c}' }

What am I missing such that I can find and query my custom WMI classes?


  • Shane_CorbinShane_Corbin Member Posts: 270

    Found the issue. I had only made WMI classes for non-NDIS devices previously. Doing the OID-WMI bridging was new to me. The missing link was that the name of the MOF resource is a fixed string. Previously I could name it whatever I wanted and then make sure I reference it in my call to WdfDeviceAssignMofResourceName(). Looks like you must use NdisMofResource MOFDATA <your_mof>.bmf

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