ManagementObjectSearcher will fail in some conditions

Question

Hello

I use this code to get some hardware info, ie MyQuery("BusType") etc:

Using MySearcher As New ManagementObjectSearcher("root\Microsoft\Windows\Storage", "SELECT * FROM MSFT_PhysicalDisk WHERE DeviceId = 1")
Using MyQuery As ManagementObject = TryCast(MySearcher.Get(0), ManagementObject)

If I disable the Winmgmt service, and enable + start it back, the above code will not work for some time (usually a few minutes) and MyQuery will be null.

Is my code correct and what causes this?

The problem is that in some cases, the same thing will also happen.

I don't get why when this happens, I can run this code and it will work:

Using Search As New ManagementObjectSearcher(New SelectQuery("Win32_Processor"))
For Each Info As ManagementObject In Search.Get
Info("Manufacturer")...

But the above first code will not!

Thank you

Answer 1

Hi @StewartBW ,

When you stop and restart the WMI service, it might take some time for it to initialize fully and start providing accurate information again. During this initialization period, your code may not be able to retrieve the expected data.

You can try using loops with a delay to retry until the query returns a result.

Best Regards.

Jiachen Li

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Answer 2

I noticed the same thing on my PC (Windows 10 22H2) by doing tests with WMI Code Creator

But for physical disk, you should use Win32_DiskDrive