如何在Python中捕获系统暂停事件？

Question

我使用的是Ubuntu 12.04。有没有办法在Python中捕捉暂停事件，即如果笔记本电脑要暂停，请执行此操作...？捕捉关机事件的同一个问题。

Answer 1

我认为最简单的方法是使用DBUS python接口 和听“AboutToSleep”和/或“org.freedesktop.UPower”接口“睡觉”事件

Answer 2

您可以扩展此代码，它监听来自acpid的事件，试着打印它接收到的字符串并生成你想要的事件，看看这个字符串是什么样的。

s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) 
s.connect("/var/run/acpid.socket") 
print "Connected to acpid" 
while 1: 
    for event in s.recv(4096).split('\n'): 
     event=event.split(' ') 
     if len(event)<2: continue 
     print event 
     if event[0]=='ac_adapter': 
      if event[3]=='00000001': #plugged 
       plugged() #Power plugged event 
      else: #unplugged 
       unplugged() #Power unplugged event 
     elif event[0]=='button/power': 
      power_button() #Power button pressed 
     elif event[0]=='button/lid': 
      if event[2]=='open': 
       lid_open() #Laptop lid opened 
      elif event[2]=='close': 
       lid_close() #Laptop lid closed 

Answer 3

如果有一个人对同样的问题绊倒，下面的代码：

#!/usr/bin/env python 

import dbus  # for dbus communication (obviously) 
import gobject # main loop 
from dbus.mainloop.glib import DBusGMainLoop # integration into the main loop 

def handle_resume_callback(): 
    print "System just resumed from hibernate or suspend" 

def handle_suspend_callback(): 
    print "System about to hibernate or suspend" 

DBusGMainLoop(set_as_default=True) # integrate into main loob 
bus = dbus.SystemBus()    # connect to dbus system wide 
bus.add_signal_receiver(   # defince the signal to listen to 
    handle_resume_callback,   # name of callback function 
    'Resuming',      # singal name 
    'org.freedesktop.UPower',   # interface 
    'org.freedesktop.UPower'   # bus name 
) 

bus.add_signal_receiver(   # defince the signal to listen to 
    handle_suspend_callback,   # name of callback function 
    'Sleeping',      # singal name 
    'org.freedesktop.UPower',   # interface 
    'org.freedesktop.UPower'   # bus name 
) 

loop = gobject.MainLoop()   # define mainloop 
loop.run()       # run main loop