Function winapi::um::setupapi::SetupDiGetClassDevsExW

pub unsafe extern "system" fn SetupDiGetClassDevsExW(
    ClassGuid: *const GUID, 
    Enumerator: PCWSTR, 
    hwndParent: HWND, 
    Flags: DWORD, 
    DeviceInfoSet: HDEVINFO, 
    MachineName: PCWSTR, 
    Reserved: PVOID
) -> HDEVINFO