// PowerInformation.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <Windows.h>
#include <process.h>
#include <signal.h>
#include <NTstatus.h>
#include <Powrprof.h>
#include <iostream>

#define WIN32_NO_STATUS

typedef struct _PROCESSOR_POWER_INFORMATION {
    ULONG  Number;
    ULONG  MaxMhz;
    ULONG  CurrentMhz;
    ULONG  MhzLimit;
    ULONG  MaxIdleState;
    ULONG  CurrentIdleState;
} PROCESSOR_POWER_INFORMATION, *PPROCESSOR_POWER_INFORMATION;

using namespace std;

static void startMonitoringCoreSpeeds(void *param)
{
    while (true)
    {
        // get the number or processors
        SYSTEM_INFO si = { 0 };
        ::GetSystemInfo(&si);
        // allocate buffer to get info for each processor
        const int size = si.dwNumberOfProcessors * sizeof(PROCESSOR_POWER_INFORMATION);
        LPBYTE pBuffer = new BYTE[size];

        NTSTATUS status = ::CallNtPowerInformation(ProcessorInformation, NULL, 0, pBuffer, size);
        if (STATUS_SUCCESS == status)
        {
            // list each processor frequency
            PPROCESSOR_POWER_INFORMATION ppi = (PPROCESSOR_POWER_INFORMATION)pBuffer;
            for (DWORD nIndex = 0; nIndex < si.dwNumberOfProcessors; nIndex++)
            {
                std::cout << "Processor #" << ppi->Number << " frequency: "
                    << ppi->CurrentMhz << " MHz" << std::endl;
                ppi++;
            }
        }
        else
        {
            std::cout << "CallNtPowerInformation failed. Status: " << status << std::endl;
        }
        delete[]pBuffer;
        Sleep(1000);
    }
}

int _tmain(int argc, _TCHAR* argv[])
{
    _beginthread(startMonitoringCoreSpeeds, 0, NULL);
    cin.get();
}