<Solved> (PyUSB)检测最新/新的插头USB

Question

我有一个功能，可以列出所有与USB接口的计算机连接。

我想要检测到我刚刚插入的最新/新的USB，然后打印出它的txt文件，从上一个/新USB我只是插入.

我想出的一种方法是，在插入USB之前，该函数可以运行time1。然后有10个装置。在我插入time2之后，有11个设备。这样我就能区分最后一个了。

我阅读了相关的问题，Trigger new plugged USB-HDD or USB-Stick device，但仍然不知道如何做。

• 函数可以列出与USB端口的所有计算机连接：

。

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()))

所有USB的输出：

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

Answer 1

您可以使用字典来跟踪已找到的设备。每个设备都有其独特的串行标识，可以作为密钥使用。

然后重复扫描几次(例如，在一个循环中有几秒钟的延迟)。如果一个设备还没有用它的串行id在字典中注册，你知道它是最近添加的。

示例

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.')