Strange, I am using exactly the system system I've never faced this problem...
I guess this library name binding issue is gonna be a little headache
to solve... :)
2009/10/21 Michael Strecke <michael.stre...@googlemail.com>:
> After installing pyusb under Ubuntu Jaunty (AMD64) kernel the command:
>
> dev = usb.core.find()
>
> raised the following exception:
>
> File "/usr/local/lib/python2.6/dist-packages/usb/core.py", line 784,
> in find
> raise ValueError('No backend is available in the system')
> ValueError: No backend is available in the system
>
> I traced the problem back to usb/backend/libusb01.py
>
> libname = ctypes.util.find_library('usb')
>
> After some wrestling with the regular expression in find_library, I
> noticed that in my system the file is called libusb-0.1 which does not
> match this nice looking pattern:
>
> expr = r'(\S+)\s+\((%s(?:, OS
> ABI:[^\)]*)?)\)[^/]*(/[^\(\)\s]*lib%s\.[^\(\)\s]*)' \
> % (abi_type, re.escape(name))
>
> After changing the source to
>
> libname = ctypes.util.find_library('usb-0.1')
>
> all works well.
>
> I guess the take-away from this is that this old library has a new name,
> at least on newer Ubuntu systems.
>
>
> Michael
>
>
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