Re: [pyusb-users] backend not loading

[Sylvain M. <ki...@gm...>]

Hi,

  No change by installing libusb-1.0-0.  I also tried pointing to it
directly using this line

usb.backend.libusb1.get_backend(find_library=lambda x:
"/usr/lib/x86_64-linux-gnu/libusb-1.0.so")

Still the same error :-/

python_1    | 2017-12-19 19:40:25,197
DEBUG:usb.backend.libusb1:_LibUSB.__init__(<CDLL
'/usr/lib/x86_64-linux-gnu/libusb-1.0.so', handle 7cbd00 at 0x7fe8641b30f0>)
python_1    | 2017-12-19 19:40:25,197 ERROR:usb.backend.libusb1:Error
loading libusb 1.0 backend
python_1    | Traceback (most recent call last):
python_1    |   File
"/usr/local/lib/python3.6/site-packages/usb/backend/libusb1.py", line
945, in get_backend
python_1    |     return _LibUSB(_lib)
python_1    |   File
"/usr/local/lib/python3.6/site-packages/usb/_debug.py", line 60, in do_trace
python_1    |     return f(*args, **named_args)
python_1    |   File
"/usr/local/lib/python3.6/site-packages/usb/backend/libusb1.py", line
708, in __init__
python_1    |     _check(self.lib.libusb_init(byref(self.ctx)))
python_1    |   File
"/usr/local/lib/python3.6/site-packages/usb/backend/libusb1.py", line
595, in _check
python_1    |     raise USBError(_strerror(ret), ret, _libusb_errno[ret])
python_1    | usb.core.USBError: [Errno None] Other error
python_1    | 2017-12-19 19:40:25,198
DEBUG:usb.backend.libusb1:_LibUSB._finalize_object()
west_python_1 exited with code 139



On 2017-12-19 02:08 PM, Srujan Chaitanya wrote:
> Try installing libusb , I think dev version just by itself not usefull.
>
>> On Dec 19, 2017, at 6:36 AM, Sylvain Martel <ki...@gm...> wrote:
>>
>> Hi,
>>
>>  I'm trying to use pyusb in a container but it has problem connecting to libusb.
>>
>> In the container, libusb is installed using "RUN apt-get install -y libusb-1.0-0-dev"
>>
>> and I'm trying this simple code:
>>
>> import usb.core
>> import usb.util
>>
>> def main(args=None):
>>     #open()
>>     usb.core.find()
>>
>> I then get this error message:
>>
>> python_1    | 2017-12-19 13:58:20,475 DEBUG:usb.backend.libusb1:_LibUSB.__init__(<CDLL 'libusb-1.0.so.0', handle 19ea450 at 0x7fdce0585c50>)
>> python_1    | 2017-12-19 13:58:20,475 ERROR:usb.backend.libusb1:Error loading libusb 1.0 backend
>> python_1    | Traceback (most recent call last):
>> python_1    |   File "/usr/local/lib/python3.6/site-packages/usb/backend/libusb1.py", line 945, in get_backend
>> python_1    |     return _LibUSB(_lib)
>> python_1    |   File "/usr/local/lib/python3.6/site-packages/usb/_debug.py", line 60, in do_trace
>> python_1    |     return f(*args, **named_args)
>> python_1    |   File "/usr/local/lib/python3.6/site-packages/usb/backend/libusb1.py", line 708, in __init__
>> python_1    |     _check(self.lib.libusb_init(byref(self.ctx)))
>> python_1    |   File "/usr/local/lib/python3.6/site-packages/usb/backend/libusb1.py", line 595, in _check
>> python_1    |     raise USBError(_strerror(ret), ret, _libusb_errno[ret])
>> python_1    | usb.core.USBError: [Errno None] Other error
>> python_1    | 2017-12-19 13:58:20,477 DEBUG:usb.backend.libusb1:_LibUSB._finalize_object()
>>
>>
>> Any idea what might cause the problem?
>> ------------------------------------------------------------------------------
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>
> ------------------------------------------------------------------------------
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