问Linux:在PyQt5图形用户界面上显示当前连接的所有U盘的名称

EN

from functools import partial
import os
import sys

import pyudev

from PyQt5.QtWidgets import QApplication
from PyQt5.QtCore import QSocketNotifier, QObject, pyqtSignal


class MainWindow():

    def __init__(self, parent=None):
        super().__init__()
        # GUI code
        pass

    def print_name(self, name):
        print(name)


class LinuxDeviceMonitor(QObject):
    devices_changed = pyqtSignal(list)

    def __init__(self):
        super().__init__()
        self._context = pyudev.Context()

        self._monitor = pyudev.Monitor.from_netlink(self._context)
        self._monitor.start()

        self._devices = set()

        self._process_devices(self._context.list_devices(), action="add")

    def fileno(self):
        return self._monitor.fileno()

    @property
    def device_names(self):
        return [pyudev.Devices.from_path(self._context, device).get("DEVNAME") for device in self._devices]

    def process_incoming(self):
        read_device = partial(pyudev._util.eintr_retry_call, self._monitor.poll, timeout=0)
        self._process_devices(iter(read_device, None))
        self.devices_changed.emit(self.device_names)

    def _process_devices(self, devices, action=None):
        for device in devices:
            action = device.action if action is None else action

            if action in ("add", "change") and self._is_usb_mass_storage_device(device):
                self._devices.add(device.sys_path)
            elif action == "remove" and device.sys_path in self._devices:
                self._devices.remove(device.sys_path)

    @classmethod
    def _read_device_flag(self, device, name):
        path = os.path.join(device.sys_path, name)
        try:
            with open(path) as data:
                return bool(int(data.read()))
        except (IOError, ValueError):
            return False

    def _is_usb_mass_storage_device(self, device):
        is_removable = self._read_device_flag(device, "removable")
        has_size = self._read_device_flag(device, "size")
        has_usb = device.get("ID_BUS") == "usb"
        has_no_disc = device.get("ID_CDROM") is None
        return is_removable and has_size and has_usb and has_no_disc


def main():
    app = QApplication(sys.argv)

    main_window = MainWindow()

    linux_device_monitor = LinuxDeviceMonitor()

    notifier = QSocketNotifier(linux_device_monitor.fileno(), QSocketNotifier.Read)
    notifier.activated.connect(linux_device_monitor.process_incoming)

    linux_device_monitor.devices_changed.connect(main_window.print_name)

    sys.exit(app.exec_())


if __name__ == '__main__':
    main()