How to get numeric information about system performance using WMI calls?

Hello everyone,
I'll make the question summarized for your convenience. I want to achieve the following task:
-To be able to measure system performance over a sustained period of time.
The way I intend to tackle that task is by doing the following:
-To use WMI calls to get system performance data in a numeric and/or a percentage form. (RAM utilization, CPU utilization, Power state [active/idle]).
The information I am trying to get is EXACTLY the information you can see in Task Manager under Performance tab.
Please help. If you think there is a better way to do this than using WMI calls, I couldn't be more glad to take your advice and apply it!!
Thanks in advance!
Ray

There is a better way.
Use PDH function calls. This gets you as close as you can get to the performance counters provided by the operating system.
Read more about it here.
Examples found here.
Codeproject example here and
here

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