python - hid.find_all_hid_devices() in asyncio coroutine -

in order access a usb hid device connected on computer use function find_all_hid_devices()from pywinusb package.

now access hid device asyncio coroutine. following code

@asyncio.coroutine def main():     pywinusb import hid     = hid.find_all_hid_devices() 

the following error returned:

traceback (most recent call last):   file "c:\python34\lib\site-packages\pywinusb\hid\core.py", line 122, in find_all_hid_devices     interface_data in winapi.enum_device_interfaces(h_info, guid):   file "c:\python34\lib\site-packages\pywinusb\hid\winapi.py", line 466, in enum_device_interfaces     byref(dev_interface_data) ): ctypes.argumenterror: argument 1: <class 'overflowerror'>: int long convert 

the same call hid.find_all_hid_devices() works on own, in plain main without asyncio.

is due fact i'm trying access within coroutine? proper way achieve this?

pywinusb library synchronous design, should call in thread pool.

@asyncio.coroutine def f():     loop = asyncio.get_event_loop()     = yield loop.run_in_executor(none, hid.find_all_hid_devices) 

synchronous call coroutine allowed technically discouraged because pauses event loop long time period.