Well set_configuration() delivers on some devices like "usb to uart cable" the 
error "[Errno 40] Operation not supported or unimplemented on this platform".



-------- Original-Nachricht --------
> Datum: Fri, 14 Dec 2012 08:01:28 -0200
> Von: Wander Lairson Costa <wander.lair...@gmail.com>
> An: pyusb-users@lists.sourceforge.net
> Betreff: Re: [pyusb-users] device.get_active_configuration() results in error

> 2012/12/14 Stefano Di Martino <stefan...@gmx.net>:
> > It doesn't matter if I you set_configuration() or not.
> >
> 
> Actually should. When you do set_configuration, PyUSB just caches the
> configuration value and get_active_configuration just returns it. If
> you don't, PyUSB may issue a get_descriptor request to the device.
> 
> -- 
> Best Regards,
> Wander Lairson Costa
> 
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