win32 api function to get processor's current speed

Question

I am unaware of a win32 api function/functions used to query the local PC processor's current speed. I wish not to use WMI because it seems unlikely to be feasible on all PCs.

Answer 1

You can call the Windows API function CallNtPowerInformation with the argument ProcessorInformation. It returns a PROCESSOR_POWER_INFORMATION structure which tells you the current and max CPU speed for each of your system's CPUs.

This is only supported on Win32 desktop, not Metro or Windows Phone, though.