Re: [pyusb-users] LibUSB and PyUSB on Windows 10 and python 3.4

[igor b. <ig...@ho...>]

Thanks !!I did added libusb-1.0.lib to lib folder in Python directory and then Python was able to use libusb1 backend with Pyusb.then I added for loop as Tormond has suggested and it worked.

From: ig...@ho...
To: pyu...@li...
Date: Fri, 8 Jan 2016 19:56:17 +0200
Subject: Re: [pyusb-users] LibUSB and PyUSB on Windows 10 and python 3.4




I tried to run this price of code to check if usblib1 is getting detected by pyusb:

import osos.environ['PYUSB_DEBUG'] = 'debug'import usb.coreusb.core.find()
and this is the output:OSError: [WinError 193] %1 is not a valid Win32 application2016-01-08 19:51:45,676 ERROR:usb.backend.libusb1:Error loading libusb 1.0 backend2016-01-08 19:51:45,679 ERROR:usb.libloader:'OpenUSB library' could not be found2016-01-08 19:51:45,679 ERROR:usb.backend.openusb:Error loading OpenUSB backend2016-01-08 19:51:45,689 INFO:usb.core:find(): using backend "usb.backend.libusb0"2016-01-08 19:51:45,689 DEBUG:usb.backend.libusb0:_LibUSB.enumerate_devices()
looks like pyusb dosn't see libusb1
> Date: Fri, 8 Jan 2016 18:07:14 +0100
> From: lis...@gm...
> To: pyu...@li...
> Subject: Re: [pyusb-users] LibUSB and PyUSB on Windows 10 and python 3.4
> 
> On Fri, Jan 8, 2016 at 4:38 PM, igor bezenchuk wrote:
> >
> > Python 3.4.3 (v3.4.3:9b73f1c3e601, Feb 24 2015, 22:44:40) [MSC v.1600 64 bit
> > (
> > D64)] on win32
> > Type "help", "copyright", "credits" or "license" for more information.
> >>>> import usb.core
> >>>> dev=usb.core.find(find_all=True)
> >>>> print(dev)
> > <generator object device_iter at 0x00000000030EEE58>
> >
> > looks like it dosn't return any device found(other than Generator Object,
> > which I am not sure what it is exactly) I tried it on more than one machine
> > with similar conditions(windows 10 and windows 8.1 both with libusb 1.0.20
> > and pyusb1 and python 3.4.
> 
> find_all=True returns a list of devices (please see e.g.
> https://github.com/walac/pyusb/blob/master/docs/tutorial.rst)
> 
> You must iterate through the list:
> devices = usb.core.find(find_all=True)
> for dev in devices:
>     print (dev.idProduct, dev.idVendor)
> 
> Probably you want to just find your device, and not all. It is all
> explained in the tutorial.
> 
> Tormod
> 
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