[pyusb-users] NotImplementedError when using pyusb

Discussion:

greg yurikov

2012-05-17 18:40:21 UTC

When running the following code:

import sys
import usb.core
import usb.util

VENDOR_ID = 0x1bcf
PRODUCT_ID = 0x0007
DATA_SIZE = 8

# find the MagTek reader

device = usb.core.find(idVendor=VENDOR_ID, idProduct=PRODUCT_ID)

if device is None:
sys.exit("Could not find device.")

# make sure the hiddev kernel driver is not active

if device.is_kernel_driver_active(0):
try:
device.detach_kernel_driver(0)
except usb.core.USBError as e:
sys.exit("Could not detatch kernel driver: %s" % str(e))
....

I get this error:

File "test.py", line 20, in <module>
if device.is_kernel_driver_active(0):
File "C:\Python26\lib\site-packages\usb\core.py", line 704, in is_kernel_driver_active
return self._ctx.backend.is_kernel_driver_active(self._ctx.handle, interface)
File "C:\Python26\lib\site-packages\usb\backend\__init__.py", line 355, in is_kernel_driver_active
_not_implemented(self.is_kernel_driver_active)
File "C:\Python26\lib\site-packages\usb\backend\__init__.py", line 79, in _not_implemented
raise NotImplementedError(func.__name__)
NotImplementedError: is_kernel_driver_active

Am I suppose to implement this on my own? Can I just redirect this to another python module that actually implements this?

chris clark

2012-05-17 20:07:17 UTC

Permalink

Post by greg yurikov
....
File "test.py", line 20, in <module>
File "C:\Python26\lib\site-packages\usb\core.py", line 704, in
is_kernel_driver_active
return self._ctx.backend.is_kernel_driver_active(self._ctx.handle,
interface)
File "C:\Python26\lib\site-packages\usb\backend\__init__.py", line 355,
in is_kernel_driver_active
_not_implemented(self.is_kernel_driver_active)
File "C:\Python26\lib\site-packages\usb\backend\__init__.py", line 79,
in _not_implemented
raise NotImplementedError(func.__name__)
NotImplementedError: is_kernel_driver_active
Am I suppose to implement this on my own? Can I just redirect this to
another python module that actually implements this?

It looks like the generic device code is being fired, not the
backend implemention code.

Which backend is being used?

greg yurikov

2012-05-17 21:00:46 UTC

Permalink

I'm using the libusb1.2.4.9 win32 backend I think. I downloaded the .zip file found here:
https://sourceforge.net/projects/libusb-win32/files/libusb-win32-snapshots/20110713/

In the zip were the following files:
libusb-win32-devel-filter-1.2.4.9.exe

libusb-win32-src-1.2.4.9.zip

libusb-win32-bin-1.2.4.9.zip

libusb-win32-debug-1.2.4.9.zip

I did nothing more than run the exe. I feel like I'm missing a step here.

________________________________
From: chris clark <***@gmail.com>
To: greg yurikov <***@yahoo.com>; pyusb-***@lists.sourceforge.net
Sent: Thursday, May 17, 2012 1:07 PM
Subject: Re: [pyusb-users] NotImplementedError when using pyusb

On Thu, May 17, 2012 at 11:40 AM, greg yurikov <***@yahoo.com> wrote:

....

Post by greg yurikov
File "test.py", line 20, in <module>
File "C:\Python26\lib\site-packages\usb\core.py", line 704, in is_kernel_driver_active
return self._ctx.backend.is_kernel_driver_active(self._ctx.handle, interface)
File "C:\Python26\lib\site-packages\usb\backend\__init__.py", line 355, in is_kernel_driver_active
_not_implemented(self.is_kernel_driver_active)
File "C:\Python26\lib\site-packages\usb\backend\__init__.py", line 79, in _not_implemented
raise NotImplementedError(func.__name__)
NotImplementedError: is_kernel_driver_active
Am I suppose to implement this on my own? Can I just redirect this to another python module that actually implements this?

It looks like the generic device code is being fired, not the backend implemention code.

Which backend is being used?

chris clark

2012-05-18 00:49:33 UTC

Permalink

Ah! Windows (didn't notice that at first), it isn't implemented (and isn't
possible). I posted a similar question a while back. The response
I received is worth reading.

Chris

Wander Lairson Costa

2012-05-18 03:29:45 UTC

Permalink

Hi,

To make a long story short, in Windows, libusb needs a driver attached, so
makes no sense a function to detach the driver.

Post by greg yurikov
https://sourceforge.net/projects/libusb-win32/files/libusb-win32-snapshots/20110713/
libusb-win32-devel-filter-1.2.4.9.exe
libusb-win32-src-1.2.4.9.zip
libusb-win32-bin-1.2.4.9.zip
libusb-win32-debug-1.2.4.9.zip
I did nothing more than run the exe. I feel like I'm missing a step here.
------------------------------
*Sent:* Thursday, May 17, 2012 1:07 PM
*Subject:* Re: [pyusb-users] NotImplementedError when using pyusb
....
File "test.py", line 20, in <module>
File "C:\Python26\lib\site-packages\usb\core.py", line 704, in
is_kernel_driver_active
return self._ctx.backend.is_kernel_driver_active(self._ctx.handle,
interface)
File "C:\Python26\lib\site-packages\usb\backend\__init__.py", line 355,
in is_kernel_driver_active
_not_implemented(self.is_kernel_driver_active)
File "C:\Python26\lib\site-packages\usb\backend\__init__.py", line 79,
in _not_implemented
raise NotImplementedError(func.__name__)
NotImplementedError: is_kernel_driver_active
Am I suppose to implement this on my own? Can I just redirect this to
another python module that actually implements this?
It looks like the generic device code is being fired, not the
backend implemention code.
Which backend is being used?
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