Function PowerReadDCValueIndex 

pub unsafe fn PowerReadDCValueIndex(
    rootpowerkey: Option<HKEY>,
    schemeguid: Option<*const GUID>,
    subgroupofpowersettingsguid: Option<*const GUID>,
    powersettingguid: Option<*const GUID>,
    dcvalueindex: *mut u32,
) -> u32