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POC# WMI Query for Win32_PerfFormattedData_PerfOS_Memory returns 'Invalid class'
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  1. POC# WMI Query for Win32_PerfFormattedData_PerfOS_Memory returns 'Invalid class'
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    copied!<p>I'm running Windows 7 64Bit.</p> <p>This problem has only recently occurred as I have been working on the same section within the WMI several months ago without a problem.</p> <p>This is a machine specific problem as I have tried this test program on several other PCs and it works.</p> <p>I have run wbemtest, connected with authentication type packet and successfully enumerated the Win32_PerfFormattedData_PerfOS_Memory object and I can view the internals of the MOF which is what I am trying to do in my software.</p> <p>I have also removed and rebuilt the WMI Repository and tried re-syncing the PERF data.</p> <p>My C# application also connects with the authentication type of Packet.</p> <p>Here is the code for my simple test application (<a href="http://pastebin.com/nvNKCM2y" rel="nofollow">pastebin</a>): </p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.Management; namespace WMITest { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { MessageBox.Show(Dump()); } string Dump() { string HOST = "WILLIAM-PC"; string Data = ""; try { ConnectionOptions CO = new ConnectionOptions(); CO.Authentication = AuthenticationLevel.Packet; ManagementScope Scope = new ManagementScope(@"\\" + HOST + @"\root\cimv2", CO); Scope.Connect(); if (! Scope.IsConnected) { MessageBox.Show("Not connected!"); } Scope.Options.EnablePrivileges = true; SelectQuery Query = new SelectQuery("SELECT * FROM Win32_PerfFormattedData_PerfOS_Memory"); ManagementObjectSearcher MOS = new ManagementObjectSearcher(Scope, Query); foreach (ManagementObject MO in MOS.Get()) { foreach (PropertyData PD in MO.Properties) { Data = Data + PD.Name + " = " + PD.Value + "\n"; } } return Data; } catch (Exception E) { return "Exception: " +E.Message ; } } } } </code></pre> <p>Any suggestions would be gratefully received. Thank you.</p>
 

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