Re: [Pyusb-users] Unknown error trying to getString from devices on OSX

[Yaniv A. <ya...@ak...>]

Hi Sarah,

Many thanks for your reply, which seems right on the money other than the
platform -- it's my understanding that your patch (and bug) occur only in
linux.c, while I'm running OSX and I believe my libusb uses darwin.c. From a
rather cursory examination it appears to me that the code in darwin.c is
substantially different (of course, different USB APIs in Linux and OSX),
and in particular the set-error-but-not-description bug doesn't appear to be
there.

Makes sense? Am I missing something? Anyone else has comments?

Thanks again,
 - Yaniv

On 10/21/07, Sarah Messer <iku...@ya...> wrote:
>
> This is due to a particular line in the source that sets an error-occurred
> flag but not the numerical error code itself.  I've tried posting analysis
> and solution here<http://forums.ni.com/ni/board/message?board.id=140&message.id=21028&view=by_date_ascending&page=2>
> (as user SMesser) and here<http://sourceforge.net/tracker/index.php?func=detail&aid=1633542&group_id=1674&atid=101674>(as user spinmess).  Look for the
> libusb.c patch I've posted.
>
> *Yaniv Aknin <ya...@ak...>* wrote:
>
> Hi,
>
> I'm trying to use PyUSB on OSX (10.4.10) to enumerate USB devices. I'm not
> entirely certain why, but upon calling getString on a device (almost any
> device on my system at least, and I have a few), I'm getting a USBError,
> with usb_control_msg: unknown error.
>
> My (slightly modified) lsusb.py source is:
>
> osx:pyusb yaniv$ cat lsusb.py
> #!/usr/bin/env python
>
> import usb
> import sys
>
> for bus in usb.busses():
>         for dev in bus.devices:
>                 try:
>                         print "Bus %s Device %s: ID %04x:%04x %s" % (
> bus.dirname,dev.filename,dev.idVendor,dev.idProduct,dev.open
> ().getString(1,30))
>                 except:
>                         print 'caught ', sys.exc_info()[1]
>                         continue
> osx:pyusb yaniv$ ./lsusb.py
> caught usb_control_msg(DeviceRequestTO): unknown error
> caught usb_control_msg(DeviceRequestTO): unknown error
> caught usb_control_msg(DeviceRequestTO): unknown error
> caught usb_control_msg(DeviceRequestTO): unknown error
> caught usb_control_msg(DeviceRequestTO): unknown error
> caught usb_control_msg(DeviceRequestTO): unknown error
> caught usb_control_msg(DeviceRequestTO): pipe is stalled
> caught usb_control_msg(DeviceRequestTO): pipe is stalled
> Bus 005 Device 002-05ac-8501-ff-ff: ID 05ac:8501 Micron
> caught usb_control_msg(DeviceRequestTO): pipe is stalled
> osx:pyusb yaniv$
>
> The exception is caught on the getString(), not on the open().
>
> I don't know what's special about this Micron device which works.
>
> I've tried running as UID 0 as well.
>
> Any further ideas?
>
> Many thanks,
>  - Yaniv
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>
> -Sarah
>
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