USB interface in Python

问题

I have this (http://www.gesytec.de/en/download/easylon/p/16/) USB device connected to my Win7. I am just trying to read the vendor ID and product ID. I have Python 2.7.

Here is the code,

import usb
busses = usb.busses()
for bus in busses:
    devices = bus.devices
    for dev in devices:
        print "Device:", dev.filename
        print "  idVendor: %d (0x%04x)" % (dev.idVendor, dev.idVendor)
        print "  idProduct: %d (0x%04x)" % (dev.idProduct, dev.idProduct)

I am getting following error,

"File "<stdin>", line 1, in <module>
File "C:\Python27\lib\usb\core.py", line 846, in find
raise ValueError('No backend available')
ValueError: No backend available"

What am I doing wrong here?

回答1:

Did you install the usb library package? If so you may need to add it to your path.

回答2:

I ended up using the dll provided by manufacture instead of USB lib.

来源：https://stackoverflow.com/questions/29174671/usb-interface-in-python