的3.8制作的。
我想做一些会在后台运行的东西,只有在计算机检测到新设备连接后,代码的其余部分才能运行,是否有任何优雅的方法来执行此类操作?
这是操作系统依赖
在Linux中您可以使用pyudev
:
几乎公开了完整的libudev功能。您可以:
- 枚举设备,由特定标准(Pyudev.Context)过滤
- 查询设备信息,属性和属性,
- Monitor Devices ,无论是与背景线程,或在QT的事件循环中(Pyudev.pyqt4, pyudev.pyside),glib(pyudev.glib)和wxpython(pyudev.wx)。
https://pyudev.readthedocs.io/en/latest/
源代码在http://pyudev.readthedocs.io/en/v0.14/api/monitor.html中,请参阅receive_device()
函数
在Windows中,您可以使用WMI(Windows Management Instrumentation),例如https://blogs.msdn.microsoft.com/powershell/2007/02/02/24/displaying-usb-devices-usb-devices-using-wmi/设备管理器信息)或python绑定,例如https://pypi.python.org/pypi/infi.devicemanager
替代方案(也适用于Windows)可能是使用pyserial。您可以在单读或多线程配置中使用QTimer
(来自PYQT)而不是while
-Loop。一个基本示例(没有QTimer
或线程):
import time
from serial.tools import list_ports # pyserial
def enumerate_serial_devices():
return set([item for item in list_ports.comports()])
def check_new_devices(old_devices):
devices = enumerate_serial_devices()
added = devices.difference(old_devices)
removed = old_devices.difference(devices)
if added:
print 'added: {}'.format(added)
if removed:
print 'removed: {}'.format(removed)
return devices
# Quick and dirty timing loop
old_devices = enumerate_serial_devices()
while True:
old_devices = check_new_devices(old_devices)
time.sleep(0.5)
您可以使用OS库查看连接到计算机的所有驱动器。以下代码将告诉您驱动器名称以及是否已连接或断开连接。此外,当连接驱动器时,代码将执行函数foo()。另外,当断开驱动器时,它将执行命令ham()
import os.path
def diff(list1, list2):
list_difference = [item for item in list1 if item not in list2]
return list_difference
def foo():
print("New dive introduced")
def ham():
print("Drive disconnected")
dl = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
drives = ['%s:' % d for d in dl if os.path.exists('%s:' % d)]
print(drives)
while True:
uncheckeddrives = ['%s:' % d for d in dl if os.path.exists('%s:' % d)]
x = diff(uncheckeddrives, drives)
if x:
print("New drives: " + str(x))
foo()
x = diff(drives, uncheckeddrives)
if x:
print("Removed drives: " + str(x))
ham()
drives = ['%s:' % d for d in dl if os.path.exists('%s:' % d)]
此代码是针对Windows
如果插入
,可以使用WMIC检测USB#coding:utf-8
import os
os.system("color")
Usb = os.popen("wmic logicaldisk where drivetype=2 get description ,deviceid ,volumename").read()
print(Usb)
if Usb.find("DeviceID") != -1:
print("