Question

Ive written a code trying to activate the windows’ high perfomance power plan through the winAPI in c++. It seems to work well for all the power plans (in my terminal they are called Balanced, Power saver and Dell) excepting for the one im interested in, the high performance plan! I would like the code to go over through all the power plans and when finding the high performance one just set it on and then quit. Ill put my code underneath in case anybody can help me. thanks in advance!

#include <windows.h>
#include <powrprof.h>
#include <iostream>
#include "stdio.h"
#include <ntstatus.h>
#include <string>
#pragma comment(lib, "powrprof.lib")

using namespace std;


int main(int argc, char **argv) {


//////////////////  SET ACTIVE HIGH PERFORMANCE PLAN  ///////////////////


//Variables
UCHAR displayBuffer[64] = " ";
DWORD displayBufferSize = sizeof(displayBuffer);
GUID buffer;
DWORD bufferSize = sizeof(buffer);

//Go throught the machine's power plans and activate the high performance one
for(int index = 0; ; index++)
{

    if (ERROR_SUCCESS == PowerEnumerate(NULL,NULL,&GUID_VIDEO_SUBGROUP,ACCESS_SCHEME,index,(UCHAR*)&buffer,&bufferSize) )
    {
        if (ERROR_SUCCESS == PowerReadFriendlyName(NULL,&buffer,&NO_SUBGROUP_GUID,NULL,displayBuffer,&displayBufferSize) )
        {
            wprintf(L"%s\n", (wchar_t*)displayBuffer);


            if( 0 == wcscmp ( (wchar_t*)displayBuffer, L"High Performance" ) )
            {
                cout << "High Performance Plan Found!\n";
                if (ERROR_SUCCESS == PowerSetActiveScheme(NULL,&buffer) )
                {
                cout << "* Setting Active High Performance Power Plan *";
                //std::cin.get(); //pause
                break;
                }

            }
        }

    }
    else break;
}


return 0;

}

Answer 1

This can be done a bit easier:

PowerSetActiveScheme(0, &GUID_MIN_POWER_SAVINGS);