On Wed, Jan 20, 2021 at 6:20 PM Steve Kranish via pyusb-users <pyusb-users@lists.sourceforge.net> wrote: > > This is a widely reported problem which has just been left dangling for > many people. I have yet to see a complete, meaningful resolution.
This is not true. The solution, as you have already gathered, is to install libusb. > Almost no one mentions what versions of what they are using.. By the way, you haven't mentioned whether you're running 32 or 64 bit Windows and Python. > I have libusb-1.0.dll in c:\windows\system32 AND the directory where my > python script exits. I still get the “No backend available” error. Once common 64-bit Windows problem is that 64-bits DLLs go in C:\Windows\System32 while 32-bit DLLs need to go in C:\Windows\SysWOW64. Perhaps that's your issue? > dev = usb.core.find(backend=backend, find_all=True) > File > “C:\Users\skranish\AppData\Local\Programs\Python\Python38\lib\site-packages\usb\core.py”, > line 1297, in find > raise NoBackendError(‘No backend available’) > usb.core.NoBackendError: No backend available > > This must be dependent on SOMETHING ELSE that needs to be installed. Nope, sorry. > Perhaps in some installations, is installed by default, and in other > installations it is missing. > > Windows 7, Python 3.8 (required for W7) > libusb 1.0.23b7 > pyusb 1.1.0 _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
