Hello,
I am trying to get pyusb working on OSX 10.8 with Python 2.7 (my goal is
to be able to communicate with a novation nocturn using python, see
https://github.com/dewert/nocturn-linux-midi which relies on pyusb.)
I installed libusb 1.0 through macports
$ port installed libusb -v
The following ports are currently installed:
libusb @1.0.9_0 (active)
libusb @1.0.9_0+universal
Now after installing pyusb (and setting PYUSB_DEBUG_LEVEL = debug), it
seems pyusb cannot find any backend :
>>> import usb
>>> usb.core.find()
2013-03-09 10:28:47,635 ERROR:usb.backend.libusb1:Error loading libusb
1.0 backend
Traceback (most recent call last):
File "/Library/Python/2.7/site-packages/usb/backend/libusb1.py", line
655, in get_backend
_lib = _load_library()
File "/Library/Python/2.7/site-packages/usb/backend/libusb1.py", line
205, in _load_library
raise OSError('USB library could not be found')
OSError: USB library could not be found
2013-03-09 10:28:47,636 ERROR:usb.backend.openusb:Error loading OpenUSB
backend
Traceback (most recent call last):
File "/Library/Python/2.7/site-packages/usb/backend/openusb.py", line
701, in get_backend
_lib = _load_library()
File "/Library/Python/2.7/site-packages/usb/backend/openusb.py", line
248, in _load_library
raise OSError('USB library could not be found')
OSError: USB library could not be found
2013-03-09 10:28:47,638 ERROR:usb.backend.libusb0:Error loading libusb
0.1 backend
Traceback (most recent call last):
File "/Library/Python/2.7/site-packages/usb/backend/libusb0.py", line
580, in get_backend
_setup_prototypes(_lib)
File "/Library/Python/2.7/site-packages/usb/backend/libusb0.py", line
208, in _setup_prototypes
lib.usb_open.argtypes = [POINTER(_usb_device)]
File
"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ctypes/__init__.py",
line 366, in __getattr__
func = self.__getitem__(name)
File
"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ctypes/__init__.py",
line 371, in __getitem__
func = self._FuncPtr((name_or_ordinal, self))
AttributeError: dlsym(RTLD_DEFAULT, usb_open): symbol not found
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Library/Python/2.7/site-packages/usb/core.py", line 856, in find
raise ValueError('No backend available')
ValueError: No backend available
Could anyone point me to the next thing to do in this case (I did search
the mailing list and the internet, where similar issues where occuring,
but I could not find an answer explicit enough for me to understand what
to do: I am rather new to both OSX and Python)
Thanks,
Mathieu
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