Just curious, cause I had a run-in regarding this, but are you utilizing the
asynchronous API by chance? I didn't see anything on that tutorial about it.
I had a fun time trying to get it to work. I think libusb-1.0 and Python are
simply incompatible with each other (through threading), unless someone has
figured out what I couldn't. Incidentally, openusb worked, but memory usage
kept climbing upwards. I didn't bother to see if there were memory leaks in
openusb.
On Mon, Oct 19, 2009 at 10:34 AM, follower <follo...@rancidbacon.com> wrote:
> Hi,
>
> I've been working with the 1.x series of code (some notes:
> <http://code.rancidbacon.com/LearningAboutPythonandUSB>) and
> encountered an issue where it appears there's no easy way to retrieve
> string descriptors, AFAICT.
>
> I wrote a function to make retrieving string descriptors more
> straightforward and incorporated it in an example 'lsusb' script:
> <http://code.rancidbacon.com/files/lsusb.py>
>
> I've included the code of the function below.
>
> It's not the most robust of code but hopefully it might save someone
> the time it took me to work out how to get it working.
>
> If it's useful feel free to consider it a "patch". :)
>
> --Philip;
>
>
> def getStringDescriptor(device, index):
> """
> """
> response = device.ctrl_transfer(usb.util.ENDPOINT_IN,
> usb.legacy.REQ_GET_DESCRIPTOR,
> (usb.util.DESC_TYPE_STRING << 8) |
> index,
> 0, # language id
> 255) # length
>
> # TODO: Refer to 'libusb_get_string_descriptor_ascii' for error handling
>
> return response[2:].tostring().decode('utf-16')
>
>
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