I have a function can list out all the computer connection with USB port.
I want to detect the last/new USB I just plug in, then print out it's txt file from last/new USB I just plug.
One way I come up is that the function can run time1, before I plug USB in. Then there are 10 devices.
After I plug in, time2, there are 11 devices. So I can differentiate the last one.
I read through relate question, Trigger new plugged USB-HDD or USB-Stick device but still not sure how to do.
import usb.core
import usb.backend.libusb1
print('idVendor idProduct Manufacturer - Product')
print('----------------------------------------------------')
busses = usb.busses()
for bus in busses:
for dev in bus.devices:
if dev:
xdev = usb.core.find(idVendor=dev.idVendor, idProduct=dev.idProduct)
if xdev._manufacturer is None:
xdev._manufacturer = usb.util.get_string(xdev, xdev.iManufacturer)
if xdev._product is None:
xdev._product = usb.util.get_string(xdev, xdev.iProduct)
print('%8d %9d %s - %s' % (dev.idVendor, dev.idProduct,
str(xdev._manufacturer).strip(),
str(xdev._product).strip()))
output of all USB:
idVendor idProduct Manufacturer - Product
----------------------------------------------------
1133 49271 Logitech - USB Optical Mouse
1423 37728 - USB Reader 34148 4096 JetFlash - Mass Storage Device
7531 2 Linux 5.15.0-48-generic xhci-hcd - xHCI Host Controller
7531 3 Linux 5.15.0-48-generic xhci-hcd - xHCI Host Controller
5117 2112 Generic - External
7531 2 Linux 5.15.0-48-generic xhci-hcd - xHCI Host Controller
7531 3 Linux 5.15.0-48-generic xhci-hcd - xHCI Host Controller
You can use a dictionary to keep track of found devices. Each device has its unique serial-id which can be used as key.
Then repeat the scan several times (e.g. in a loop with some seconds delay). If a device is not yet registered in the dictionary with its serial-id, you know it was recently added.
import time
from usb.core import find
from usb.util import get_string
import usb.backend.libusb1
def info_usb_device(dev):
xdev = find(idVendor=dev.idVendor, idProduct=dev.idProduct)
if xdev.bDeviceClass == 9: # don't list HUBs, see [USB class-codes](https://www.usb.org/defined-class-codes)
return
if xdev._manufacturer is None:
xdev._manufacturer = get_string(xdev, xdev.iManufacturer, langid=1033)
if xdev._product is None:
xdev._product = get_string(xdev, xdev.iProduct, langid=1033)
device_info = '[%20s] %8d %9d %s - %s' % (xdev.serial_number, dev.idVendor, dev.idProduct,
str(xdev._manufacturer).strip(),
str(xdev._product).strip())
return (xdev.serial_number, device_info)
def add_usb_devices(device_dict):
new_devices = []
for bus in usb.busses():
for dev in bus.devices:
if dev is None:
continue
serial_info = info_usb_device(dev)
if serial_info is not None:
(serial, info) = serial_info
if serial not in device_dict:
new_devices.append(serial)
device_dict[serial] = info
return new_devices
if __name__ == "__main__":
device_dict = {}
print('%22s %8s %9s %s' % ('serial', 'idVendor', 'idProduct', 'Manufacturer - Product'))
print('-'*22, '-'*8, '-'*9, '-'*30)
# first scan
add_usb_devices(device_dict)
for device_info in device_dict.values():
print(device_info)
# next scans
for i in range(5): # run 5 more scans
new_serials = add_usb_devices(device_dict)
if len(new_serials) > 0:
print('** (scan %d) FOUND NEW USB DEVICES/SERIALS: %s' % (i, new_serials))
for serial in new_serials:
print(device_dict[serial])
time.sleep(3) # waiting 3 seconds before new scan
print('Scans completed.')