[pyusb-users] WindowsError: exception: access violation reading 0x00000010

[Aaron M. <amu...@ar...>]

I installed pyusb on Windows XP SP3 32bit then installed libusb1.0 and then
libusb-win32.

 

I can detect usb devices and read their descriptions using 

 

dev = usb.core.find(.)

dev.idVendor

ect.

 

I can even get down to the endpoints of the USB devices:

 

Ep = dev[0][(0,0)][0] 

 

But when I try Ep.write('test') or Ep.read(1) I get this:

 

Traceback (most recent call last):

  File "<console>", line 1, in <module>

  File "C:\Python26\lib\site-packages\usb\core.py", line 276, in write

    return self.device.write(self.bEndpointAddress, data, self.interface,
timeout)

  File "C:\Python26\lib\site-packages\usb\core.py", line 593, in write

    intf = self._ctx.get_interface(self, interface)

  File "C:\Python26\lib\site-packages\usb\core.py", line 153, in
get_interface

    cfg = self.get_active_configuration(device)

  File "C:\Python26\lib\site-packages\usb\core.py", line 165, in
get_active_configuration

    bConfigurationValue=self.backend.get_configuration(self.handle)

  File "C:\Python26\lib\site-packages\usb\_debug.py", line 52, in do_trace

    return f(*args, **named_args)

  File "C:\Python26\lib\site-packages\usb\backend\libusb10.py", line 460, in
get_configuration

    _check(_lib.libusb_get_configuration(dev_handle, byref(config)))

WindowsError: exception: access violation reading 0x00000010

 

Any ideas?

 

Thanks so much.  I'm just starting to look at this but it would be
incredibly useful if I can get it to work.

 

Aaron