Write it at the language you know best.
Btw the WMI class you are inquiring will give you the Video controller settings.
As i see you want the screen resolution so you must use the Win32_DisplayConfiguration WMI class.
And if that's the case then you should have clarified it at your very first post because you have wasted your time looking for something that it's not where you are looking.
As for pinging why don't u use what dbasnett is telling you?
I don't know if ping will always deliver the true latency.
You can use both solutions(ping and not ping) and see which one you fancy most.