RE: How to get CPU Usage using C# .Net
- From: urkec <urkec@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Sat, 9 Jun 2007 13:33:00 -0700
"soumya.dharmarajan@xxxxxxxxx" wrote:
Hi
I have an C# application in which I am using WMI to obtain CPU
Usage of the total system. I obtain the CPU Usage in % for System Idle
Process and subtract it from 100 to obtain CPU Usage.
Here is the code to obtain CPU Usage
ManagementScope scope = new ManagementScope("root\
\CIMV2");
scope.Options.Impersonation =
ImpersonationLevel.Impersonate;
ManagementObject obj = new ManagementObject();
string strIdle = "Idle";
char b = (char)34; //Double Quotes
string stPath =
"Win32_PerfFormattedData_PerfProc_Process.Name=" + b + strIdle + b;
ManagementPath path = new ManagementPath(stPath);
obj.Path = path;
obj.Scope = scope;
obj.Get();
Debug.Print(obj.Properties["PercentProcessorTime"].Value.ToString ());
I have given this in a while loop to print System Idle Time. But I am
getting 0 always. I searched in google to find something that will
help. I came through the following script.
function abc(x)
strComputer = "."
Set objWMIService = GetObject("winmgmts:" _
& "{impersonationLevel=impersonate}!\\" _
& strComputer & "\root\cimv2")
Set PerfProcess = objWMIService.Get(_
"Win32_PerfFormattedData_PerfProc_Process.Name='idle'")
Dim i
i = 0
While ( i < 20)
PerfProcess.Refresh_
Wscript.Echo PerfProcess.PercentProcessorTime
Wscript.Sleep 1000
i = i+1
Wend
end function
This script is giving me valid Values. I compared with Task Manager
CPU Usage. Now I tried calling this script from my C# code. I created
a ScriptControlClass instance and called the Run method after Adding
the script to the instance. See the code below
MSScriptControl.ScriptControlClass ms;
ms = new MSScriptControl.ScriptControlClass();
ms.AllowUI = true;
ms.Language = "VBScript";
ms.UseSafeSubset = false;
ms.Reset();
string str = rftScript.Text;//This is obtained from my
Form. I am copying
//script to a
Text Box in my form
object[] i = new object[1];
i[0] = "1";
ms.AddCode(str);
object oRes = ms.Run("abc",ref i );
When I run this piece of code it will give me an Exception "Generic
Failure" where ms.Run is called. I commented out
"PerfProcess.Refresh_" in VBscript and then this piece of code works
without any exception. But the problem is again System Idle Process
percentage of CPU time I am getting is 0.
Can anyone tell me a way to refresh the WMI call from C# ? Or how can
I make this VBscript work from C#? Is there any other way to get
percantage of CPU Usage?
Please help me to solve this issue
Regards
Soumya
There are probably better ways of doing this, but here goes:
using System;
using System.Management;
using System.Threading;
using System.Text;
namespace WMITest
{
class Program
{
static void Main()
{
for (int i = 0; i < 30; i++)
{
ManagementObject processor = new ManagementObject(
"Win32_PerfFormattedData_PerfOS_Processor.Name='_Total'");
processor.Get();
Console.WriteLine(processor.Properties["PercentProcessorTime"].Value);
Thread.Sleep(100); //miliseconds
}
}
}
}
--
urkec
.
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