Pyusb on windows - no backend available

python windows-7 libusb pyusb
user634340 picture user634340 · Dec 8, 2012 · Viewed 52.3k times · Source

I'm trying to have my python application interface with an NFC device via USB. The best option seems to be pyusb, but I can't get it to connect to the libusb backend. I keep getting

ValueError: No backend available

I've looked at the stack trace, and found that usb/backend/libusb10.py (which is part of pyusb) is trying to load libusb-1.0.dll to use as the backend, but it can't find it. It's not that its not in my path, its not on my computer at all!

I have installed libusb-win32 (http://libusb.org/wiki/libusb-win32), but the resulting directory only seems to include libusb0.dll. Where is libusb-1.0.dll???!

I would love to know either where to get that dll, or even a different suggestion to get pyusb to work on Windows 7.

Answer

beebek picture beebek · Jul 10, 2015

Download and install libusb-win32-devel-filter-1.2.6.0.exe. It should work.

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