How to get Device Power State of an Adapter?

Question

I'm looking for a programmatic way of querying an Display Adapter's current power state (d-state) in Windows. It's not a USB device or ACPI device. I couldn't find much on how I could access the current d-state through cmd line or an API. It could also be seen in the device manager adapter's detail info.

Display Adapter's detail tab showing the device power state

logic that i have written :

#include <windows.h>
    #include <setupapi.h>
    #include <devguid.h>
    #pragma comment (lib, "SetupAPI.lib")
    int DeviceManager::GetDeviceDriverPowerData() {
        int res = 0;
        HDEVINFO hDevInfo;
        SP_DEVINFO_DATA DeviceInfoData = { sizeof(DeviceInfoData) };
    
        // get device class information handle
        hDevInfo = SetupDiGetClassDevs(&GUID_DEVCLASS_ADAPTER, 0, 0, DIGCF_PRESENT  /*| DIGCF_PROFILE*/);
        if (hDevInfo == INVALID_HANDLE_VALUE)
        {
            res = GetLastError();
            return res;
        }
    
        // enumerute device information
        DWORD required_size = 0;
        for (int i = 0; SetupDiEnumDeviceInfo(hDevInfo, i, &DeviceInfoData); i++)
        {
            DWORD DataT;
            CM_POWER_DATA cmPowerData = { 0 };
    
            // get device description information
            if (!SetupDiGetDeviceRegistryPropertyA(hDevInfo, &DeviceInfoData, SPDRP_DEVICE_POWER_DATA, &DataT, (PBYTE)&cmPowerData, sizeof(cmPowerData), &req_bufsize))
            {
                res = GetLastError();
                continue;
            }
    
            printf("PowerState:%d.\n", cmPowerData.PD_MostRecentPowerState);
        }
    
        return 0;
    }

but it doesn't work .