Reading pen drive data

mukesh tiwari mukeshtiwari.iiitm at gmail.com
Sat Sep 3 18:21:57 CEST 2011


On Sep 3, 7:40 pm, mukesh tiwari <mukeshtiwari.ii... at gmail.com> wrote:
> Hello all
> I am trying to write a python script which can mount a pen drive and
> read the data from pen drive. I am using pyudev [http://packages.python.org/pyudev/api/index.html] and wrote a small
> python code
>
> import pyudev, sys
> if __name__ =="__main__":
>         context = pyudev.Context()
>         devices = context.list_devices(subsystem        ="usb")
>         for device in devices :
>                 print device
>
> which prints
>
> Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4/4-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5/5-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2/6-2:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7/7-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8/8-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-0:1.0')
>
> My problem is,  how to know  out of these usb which one to read . The
> other solution I got is whenever I insert the pen drive , my system
> mounts  it in /media  directory so I can read the /media directory  to
> check if its empty or not but this does not seems promising to me
> because it may be possible that my system is not able to mount the pen
> drive so I have to manually do it .  Kindly some one please tell me
> how to solve this problem.

I got this link and its working fine [ http://packages.python.org/pyudev/api/monitor.html
]
>>> context = pyudev.Context()
>>> monitor = pyudev.Monitor.from_netlink(context)
>>> monitor.filter_by(subsystem='input')
>>> for action, device in monitor:
...     print('{0}: {1}'.format(action, device))

but when I am trying to execute code [ http://packages.python.org/pyudev/api/toolkit.html
]

import pyudev, sys

context = pyudev.Context()
monitor = pyudev.Monitor.from_netlink(context)
monitor.filter_by(subsystem='usb')
observer = QUDevMonitorObserver(monitor)
def device_connected(device):
     print('{0!r} added'.format(device))
observer.deviceAdded.connect(device_connected)
monitor.start()

I am getting
Traceback (most recent call last):
  File "Mount.py", line 7, in <module>
    observer = QUDevMonitorObserver(monitor)
NameError: name 'QUDevMonitorObserver' is not defined

Could any one please tell me how to avoid this error .
Thank you



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