WMI for Win32_Volume not working

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- 31 May 2004 05:09 GMT

I'm trying to execute this simple query:

ObjectQuery objectQuery = new ObjectQuery("Select * FROM Win32_Volume");
ManagementObjectSearcher searcher =
new ManagementObjectSearcher(objectQuery);
ManagementObjectCollection moc = searcher.Get();
try
{
foreach (ManagementObject volume in moc)
{
Console.WriteLine("Label = " + volume["Label"]);
}
}
catch (ManagementException e)
{
Console.WriteLine(e.Message);
}

But I get an ManagementException thrown in the foreach (not on the
Console.WriteLine that follows)

The message is simply "Invalid Class" which doesn't really tell me a whole
lot.

Looking around the web, I've found a couple of pieces of code that aren't
too different from this, but nothing to explain why I would be getting this
problem.

I'm running VS.NET 2003 on Win2K Professional.

Thanks for any help anyone can give.

Reply to this Message

Arne Janning - 31 May 2004 05:51 GMT

> I'm trying to execute this simple query:
>
[quoted text clipped - 25 lines]
>
> I'm running VS.NET 2003 on Win2K Professional.

Hi pdavis68@hotmail.com,

your code is compiling and running without problems on my machine.

Are you sure you added the reference to the System.Management.dll and
that you added

using System.Management;

to your code?

Cheers

Arne Janning

Reply to this Message

Ken Tucker [MVP] - 31 May 2004 11:56 GMT

Hi,

Win32_Volume isn't availble on windows xp or earlier.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/win3
2_volume.asp

Ken

> I'm trying to execute this simple query:
>
[quoted text clipped - 28 lines]
>
> Thanks for any help anyone can give.

Reply to this Message

- 31 May 2004 12:57 GMT

I had a feeling that might be the case (that's why I mentioned my OS),
though I thought it was going to be an XP-only thing.

Really, I only need one thing, the volume label. How can I get it without
the Win32_Volume WMI?

Pete

> Hi,
>
> Win32_Volume isn't availble on windows xp or earlier.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/win3
2_volume.asp

> Ken
> > I'm trying to execute this simple query:
[quoted text clipped - 29 lines]
> >
> > Thanks for any help anyone can give.

Reply to this Message

Jeff Gaines - 31 May 2004 14:02 GMT

>I had a feeling that might be the case (that's why I mentioned my OS),
>though I thought it was going to be an XP-only thing.
[quoted text clipped - 9 lines]
>>
>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/win3
2_volume.asp

[snipped]

How about:
//    GetVolumeInformation
        [DllImport("kernel32.dll",
EntryPoint="GetVolumeInformation", SetLastError=true,
CallingConvention=CallingConvention.StdCall)]
        public static extern int GetVolumeInformation(
            [MarshalAs(UnmanagedType.LPStr)]
            string lpRootPathName,
            StringBuilder lpVolumeNameBuffer,
            int nVolumeNameSize,
            ref int lpVolumeSerialNumber,
            ref int lpMaximumComponentLength,
            ref int lpFileSystemFlags,
            StringBuilder lpFileSystemNameBuffer,
            int nFileSystemNameSize);

It gets a lot of other stuff as well but it's quick.

Signature

Jeff Gaines - Damerham Hampshire UK

Reply to this Message

- 31 May 2004 14:26 GMT

Yeah, that's the way I went. I was hoping there was a managed method. I
really hate going outside of the managed API if possible, but I guess I
don't have a choice in this case.

Thanks.

Pete

> >I had a feeling that might be the case (that's why I mentioned my OS),
> >though I thought it was going to be an XP-only thing.
[quoted text clipped - 29 lines]
>
> It gets a lot of other stuff as well but it's quick.

Reply to this Message

WMI for Win32_Volume not working

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