WMI

Hi!

I have already read "Using with WMI COM classes" topic, but I have no success...
Is there anybody how can query WMI to get e.g. free memory from op.sys. class?

I have tried the ExecQuery method, but it returns a SWbemObjectSet, and I do not know how to enumerate it...
I have also tried to get the Win32_OperatingSystem object directly like: xxx.invoke("Get", "Win32_OperatingSystem"), but it always returns null.
I have success, with Win32_Services class, e.g. I am able to start/stop a service:
        DispatchPtr lWMISWbemLocator = null;
        lWMISWbemLocator = new DispatchPtr("WbemScripting.SWbemLocator");
        DispatchPtr lSWbemServices = (DispatchPtr) lWMISWbemLocator.invoke("ConnectServer", "127.0.0.1", "root\\cimv2", "", "");
                DispatchPtr lSWbemObjectService = (DispatchPtr) lSWbemServices.invoke("Get", "Win32_Service='alerter'");
        ....
        result = (Integer) getDispatcher("alerter").invoke("start");

Any help is greatly appreciated!

THX

Gabor