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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