WMI - System.Management.ManagementEx*ception

[theintrepidfox]

Dear Group

I wonder whether anyone has some information on the cause for this
error? I've created a class for Win32_BIOS with mgmtclassgen
Win32_BIOS /L VB, added the file to my VB.NET project and tried calling
a property with the following code in a button_click event:

Dim PCBios As New ROOT.CIMV2.Win32.BIOS
Debug.WriteLine(PCBios.Version*)

I get the same error with other generated Win32 classes and their
properties.

The error is:
An unhandled exception of type 'System.Management.ManagementException'
occurred in system.management.dll

Additional information: Not found

The error occurs as an example in BIOS.VB at this location in the line
(highligted green) containing the RETURN statement:
Public ReadOnly Property Version As String
Get
Return CType(curObj("Version"),String*)
End Get
End Property

Thanks for your help and efforts!

Martin

[theintrepidfox]

Hi Group

It looks like I solved the problem. Just for fellow folks experiencing
the same issue, here's what I've done:
Followed MSDN for 'Management Strongly Typed Class Generator
(Mgmtclassgen.exe)'
http://msdn.microsoft.com/library/de...lassgenexe.asp

Note that there's a a little flaw in the documentation. The following
line didn't work for VB.NET and C#:
mgmtclassgen Win32_LogicalDisk /n root\cimv2 /l VB /p c:\disk.vb

Change it to the following and it should to the trick (Note the order
of the options):
MgmtclassGen Win32_Logicaldisk /L VB /N root\cimv2 /P c:\logicaldisk.vb

I then created a VB.NET Windows Application, referenced
System.Management.dll and added logicaldisc.vb to the assembly.

Next I did add a new class called App and pasted the following code
(with some modifications):

Imports System
Imports System.Management

Public Class App
Public Shared Sub Main()

' Initialize the instance of LogicalDisk with
' the WMI instance pointing to logical drive d:.
Dim dskC As New
MSDN_WMI_SAMPLE.ROOT.CIMV2.Win32.Logicaldisk(New
ManagementPath("win32_LogicalDisk.DeviceId=""c:""" ))
Console.WriteLine("Getting Drive C: Information...")
Console.WriteLine("Caption: " + dskC.Caption)
Console.WriteLine("SystemName: " + dskC.SystemName)
Console.WriteLine("VolumneName: " + dskC.VolumeName)
Console.WriteLine("VolumneSerialNumber: " +
dskC.VolumeSerialNumber)

End Sub
End Class

And finally I created a button on a form and put the following in the
click_event

App.Main()

The error is gone and I hope this example will provide some info on how
to get info from WMI. Spent hours to get it working finally!

Martin