WMI for Win32_Volume not working

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.

[Arne Janning]

pd******@hotmail.com wrote:

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.

Hi pd******@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

[Ken Tucker [MVP]]

Hi,

Win32_Volume isn't availble on windows xp or earlier.
http://msdn.microsoft.com/library/de...n32_volume.asp

Ken
-----------------
<pd******@hotmail.com> wrote in message
news:97******************************@news.meganet news.com...

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.

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

"Ken Tucker [MVP]" <vb***@bellsouth.net> wrote in message
news:ON**************@TK2MSFTNGP12.phx.gbl...

Hi,

Win32_Volume isn't availble on windows xp or earlier.
http://msdn.microsoft.com/library/de...n32_volume.asp
Ken
-----------------
<pd******@hotmail.com> wrote in message
news:97******************************@news.meganet news.com...

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.

[Jeff Gaines]

On Mon, 31 May 2004 11:57:41 GMT, <pd******@hotmail.com> wrote:

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

"Ken Tucker [MVP]" <vb***@bellsouth.net> wrote in message
news:ON**************@TK2MSFTNGP12.phx.gbl...

Hi,

Win32_Volume isn't availble on windows xp or earlier.

http://msdn.microsoft.com/library/de...n32_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.

--
Jeff Gaines - Damerham Hampshire UK

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

"Jeff Gaines" <je**@nospam.co.uk> wrote in message
news:65********************************@4ax.com...

On Mon, 31 May 2004 11:57:41 GMT, <pd******@hotmail.com> wrote:

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

"Ken Tucker [MVP]" <vb***@bellsouth.net> wrote in message
news:ON**************@TK2MSFTNGP12.phx.gbl...

Hi,

Win32_Volume isn't availble on windows xp or earlier.

http://msdn.microsoft.com/library/de...-us/wmisdk/wmi

/win32_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.

--
Jeff Gaines - Damerham Hampshire UK