@ stdcall class_success(long ptr ptr)
@ stdcall ClassInstall(long ptr ptr)
@ stdcall class_default(long ptr ptr)
@ stdcall class_error(long ptr ptr)
@ stdcall co_success(long ptr ptr ptr)
@ stdcall CoDeviceInstall(long ptr ptr ptr)
@ stdcall co_error(long ptr ptr ptr)
@ extern callback_count
@ extern last_message