Function winapi::um::setupapi::SetupDiClassNameFromGuidExW

pub unsafe extern "system" fn SetupDiClassNameFromGuidExW(
    ClassGuid: *const GUID, 
    ClassName: PWSTR, 
    ClassNameSize: DWORD, 
    RequiredSize: PDWORD, 
    MachineName: PCWSTR, 
    Reserved: PVOID
) -> BOOL