Linux USB 设备 UDev 和 D-BUS
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USB devices UDev and D-BUS
提问by Calota Romeo
I am trying to get a list of currently plugged in USB devices in Ubuntu 10.10 and monitor changes that happen, like devices being plugged in or out using UDev and D-BUS. I'm fairly new to programming using D-BUS. I saw one example: Linux : How to detect is usb keyboard is plugged and unpluggedonly that one uses HAL and I know that HAL is deprecated. I found some working code, modified it a bit, only it doesn't work for any device only storage devices such as usb sticks, media players or cd-rom devices. I want the whole thing mice, keyboards, usb cameras chargers anything that is plugged in to the USB I want my program to know about it. This is basically what I have ( http://moserei.de/2010/01/08/accessing-devicekit-with-dbus-and-python.html):
我正在尝试获取 Ubuntu 10.10 中当前插入的 USB 设备的列表并监视发生的更改，例如使用 UDev 和 D-BUS 插入或拔出的设备。我对使用 D-BUS 编程还很陌生。我看到了一个例子：Linux : How to detection is usb keyboard is plugged and unpluggedonly that one use HAL and I know the HAL is deprecated。我找到了一些可以工作的代码，稍微修改了一下，只是它不适用于任何仅设备的存储设备，例如 U 盘、媒体播放器或 cd-rom 设备。我想要鼠标、键盘、USB 相机充电器和任何插入 USB 的东西，我想让我的程序知道它。这基本上就是我所拥有的（http://moserei.de/2010/01/08/accessing-devicekit-with-dbus-and-python.html）：
import dbus
import gobject
from dbus.mainloop.glib import DBusGMainLoop
def device_added_callback(device):
print 'Device %s was added' % (device)
def device_changed_callback(device):
print 'Device %s was changed' % (device)
#must be done before connecting to DBus
DBusGMainLoop(set_as_default=True)
bus = dbus.SystemBus()
proxy = bus.get_object("org.freedesktop.UDisks",
"/org/freedesktop/UDisks")
iface = dbus.Interface(proxy, "org.freedesktop.UDisks.Device")
devices = iface.get_dbus_method('EnumerateDevices')()
print '%s' % (devices)
#addes two signal listeners
iface.connect_to_signal('DeviceAdded', device_added_callback)
iface.connect_to_signal('DeviceChanged', device_changed_callback)
#start the main loop
mainloop = gobject.MainLoop()
mainloop.run()
Any help would be apreciated. Thank you in advance, Calota Romeo
任何帮助将不胜感激。提前谢谢你，卡洛塔罗密欧
采纳答案by ephemient
The udisksD-Bus service, obviously, only reports disks.
该udisksd-巴士服务，很明显，仅报告磁盘。
Just monitor udev directly (through libudev, through pyudev).
直接监控 udev （通过 libudev ，通过pyudev）。
import pyudev
context = pyudev.Context()
monitor = pyudev.Monitor.from_netlink(context)
observer = pyudev.pygtk.GUDevMonitorObserver(monitor)
observer.connect('device-added', device_added_callback)
observer.connect('device-changed', device_changed_callback)
monitor.enable_receiving()
mainloop = gobject.MainLoop()
mainloop.run()
回答by savruk
This is what I use to list already plugged flash sticks. You can modify script to your needs
这是我用来列出已插入的闪存棒的内容。您可以根据需要修改脚本
import dbus
bus = dbus.SystemBus()
proxy = bus.get_object("org.freedesktop.Hal", "/org/freedesktop/Hal/Manager")
iface = dbus.Interface(proxy, "org.freedesktop.Hal.Manager")
devices = iface.GetAllDevices ()
for device in devices:
try:
proxy1 = bus.get_object("org.freedesktop.Hal", device)
iface1 = dbus.Interface(proxy1, "org.freedesktop.Hal.Device")
props = iface1.GetAllProperties()
removable = iface1.GetProperty("storage.removable")
usb = iface1.GetProperty("storage.bus")
if usb== "usb":
print "\n".join(("%s: %s" % (k, props[k]) for k in props)) # shows available properties
except:
pass
And this is what I use to see if any usb plugged :
这就是我用来查看是否插入 USB 的方法：
#!/usr/bin/python
import dbus
import gobject
class DeviceAddedListener:
def __init__(self):
self.bus = dbus.SystemBus()
self.hal_manager_obj = self.bus.get_object("org.freedesktop.Hal", "/org/freedesktop/Hal/Manager")
self.hal_manager = dbus.Interface(self.hal_manager_obj,"org.freedesktop.Hal.Manager")
self.hal_manager.connect_to_signal("DeviceAdded", self._filter)
def _filter(self, udi):
device_obj = self.bus.get_object ("org.freedesktop.Hal", udi)
device = dbus.Interface(device_obj, "org.freedesktop.Hal.Device")
self.do_something(device)
def do_something(self, device):
try:
usb = device.GetProperty("storage.bus")
info = device.GetProperty("info.product")
removable = device.GetProperty("storage.removable")
print info
except:
pass#blah blah
if __name__ == '__main__':
from dbus.mainloop.glib import DBusGMainLoop
DBusGMainLoop(set_as_default=True)
loop = gobject.MainLoop()
DeviceAddedListener()
loop.run()
Here is the example of UDisks : python udisks - enumerating device information
以下是 UDisk 的示例： python udisks - 枚举设备信息
