Yes, I haven't started OpenUSB, I just "typed" the code but never
tested it. I will apply your fix so at least we can enumerate devices
using OpenUSB. Thanks a lot.
2010/7/12 Chris Wolf <cw10...@gmail.com>:
> Wander,
>
> Earlier, I mentioned that the openusb backend did not work for me on
> MacOS, but I'm pretty sure I found the problem. There seems to be a
> typo in backend/openusb.py on line #155, where it configures the return
> type for the function "openusb_init" - this line refers to the function
> as "openusb" rather then "openusb_init":
>
> $ diff -u openusb.py.orig openusb.py
> --- openusb.py.orig 2010-07-12 08:51:37.000000000 -0400
> +++ openusb.py 2010-07-12 08:51:49.000000000 -0400
> @@ -152,7 +152,7 @@
> def _setup_prototypes(lib):
> # int32_t openusb_init(uint32_t flags , openusb_handle_t *handle);
> lib.openusb_init.argtypes = [c_uint32, POINTER(_openusb_handle)]
> - lib.openusb.restype = c_int32
> + lib.openusb_init.restype = c_int32
>
> # void openusb_fini(openusb_handle_t handle );
> lib.openusb_fini.argtypes = [_openusb_handle]
>
>
> After making this fix, my test code was able to successfully use the
> openusb backend to iterate over all my USB devices.
>
> The download code archive this occurs in is named, "pyusb-1.0.0-a0.zip".
>
> Thanks,
>
> Chris Wolf
>
> Error before patch:
>
>>>> import ctypes.util
>>>> import usb.backend.openusb
>>>> libname = ctypes.util.find_library('openusb')
>>>> lib = ctypes.util.CDLL(libname)
>>>> usbbe = usb.backend.openusb.get_backend()
> 2010-07-11 14:58:19,869 ERROR:usb.backend.openusb:Error loading OpenUSB
> backend
> Traceback (most recent call last):
> File
> "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/usb/backend/openusb.py",
> line 589, in get_backend
> _setup_prototypes(_lib)
> File
> "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/usb/backend/openusb.py",
> line 155, in _setup_prototypes
> lib.openusb.restype = c_int32
> File
> "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/ctypes/__init__.py",
> line 353, in __getattr__
> func = self.__getitem__(name)
> File
> "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/ctypes/__init__.py",
> line 358, in __getitem__
> func = self._FuncPtr((name_or_ordinal, self))
> AttributeError: dlsym(0x722c10, openusb): symbol not found
>
>
>
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--
Best Regards,
Wander Lairson Costa
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