2010/7/10 Chris Wolf <cw10...@gmail.com>:
>
>
> Hello,
>
> I am just trying to perform basic iteration of USB devices to start with and
> am not getting anything.
>
> First, I installed a binary distribution of libusb01 from this location:
>
> http://www.ellert.se/twain-sane/
>
>
> ...then I installed pyusb-1.0.0-a0.
>
> ...followed by attempting to run the tutorial here:
>
> http://pyusb.sourceforge.net/docs/1.0/tutorial.html
>
> That didn't work, so I tried:
>
> *** dev = usb.core.find(find_all=True, backend=libusb01.get_backend())

Set the environment variable PYUSB_DEBUG_LEVEL=debug, run this test
again and send the results, please.

> *** print dev
> *** []
>
> - nothing :(
>
> def find(vendor, product):
>    for bus in usb.busses():
>        print bus
>        for device in bus.devices:
>            print device
>            if device.idVendor == vendor and device.idProduct == product:
>                return device
>    return None
>
> -- still nothing!
>
> Note that direct use of the libusb API works - I took this sample code:
> http://libusb.sourceforge.net/doc/examples-code.html
> and  added print statements to show the iteration of busses/devices
> which worked fine and matched what the system profiler shows as my
> attached USB devices.
>
> Does anyone have a clue for me?  Thanks in advance...
>
>   -Chris
>
>
>
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-- 
Best Regards,
Wander Lairson Costa

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