[Tutor] Pyusb: get data via USB sent from mouse

[andré palma]

Hi folks, I'm new on pyusb programming and to learn how to get data i'm 
trying  to get  data  sent  from  my mouse.
I've download a program called usbview( http://www.kroah.com/linux/usb/ 
) to display the device descriptors of any USB device  pluged  to my  
computer. 

I made a peace of code that was supposed to get the data sent from my 
mouse but when i try to run it there is an error saying that the device 
is busy  =S



Code:
=======================================================================================

import sys
import usb
import time
import struct
import array
import math


class DeviceDescriptor(object) :
    def __init__(self, vendor_id, product_id, interface_id) :
        self.vendor_id = vendor_id
        self.product_id = product_id
        self.interface_id = interface_id
       
       
    def getDevice(self) :

        busses = usb.busses()
 
        for bus in busses:       
            for device in bus.devices :
                if device.idVendor == self.vendor_id :
                    if device.idProduct == self.product_id :
                        return device
        return None






class PlugUSBDevice(object) :
   
    PLUG_VENDOR_ID = 0x1c4f         # mouse vendor id
    PLUG_PRODUCT_ID = 0x0003        # mouse product id
    PLUG_INTERFACE_ID = 0        # mouse interface number
    PLUG_INTERRUPT_IN_EP = 0x81L    # mouse end point address

    def __init__(self) :
        self.device_descriptor = 
DeviceDescriptor(PlugUSBDevice.PLUG_VENDOR_ID,
                                                  
PlugUSBDevice.PLUG_PRODUCT_ID,
                                                  
PlugUSBDevice.PLUG_INTERFACE_ID)
        self.device = self.device_descriptor.getDevice()
        self.handle = None

    def open(self) :
        self.device = self.device_descriptor.getDevice()
        self.handle = self.device.open()
        self.handle.claimInterface(self.device_descriptor.interface_id)

    def close(self) :
        self.handle.releaseInterface()

    def getDataPacket(self, bytesToGet) :
    return self.handle.interruptRead(PlugUSBDevice.PLUG_INTERRUPT_IN_EP, 
bytesToGet, 15)


if __name__ == "__main__":
    device = PlugUSBDevice()
    device.open()
    print device.getDataPacket(4)
   



The error:
************************************************************
  File "readusb.py", line 61, in <module>
    device.open()
  File "readusb.py", line 50, in open
    self.handle.claimInterface(self.device_descriptor.interface_id)
usb.USBError: could not claim interface 0: Device or resource busy
************************************************************
==================================================================================================

What am i doing wrong? =S