def find_usb(self):
bus = dbus.SystemBus()
ud_manager_obj = bus.get_object("org.freedesktop.UDisks", "/org/freedesktop/UDisks")
ud_manager = dbus.Interface(ud_manager_obj, 'org.freedesktop.UDisks')
for dev in ud_manager.EnumerateDevices():
device_obj = bus.get_object("org.freedesktop.UDisks", dev)
device_props = dbus.Interface(device_obj, dbus.PROPERTIES_IFACE)
if device_props.Get('org.freedesktop.UDisks.Device', "DriveConnectionInterface") == "usb" and device_props.Get('org.freedesktop.UDisks.Device', "DeviceIsPartition"):
if device_props.Get('org.freedesktop.UDisks.Device', "DeviceIsMounted"):
device_file = device_props.Get('org.freedesktop.UDisks.Device', "DeviceFile")
#print device_file
return device_file
else:
print "Device not mounted"
在这段 Python 代码中,find_usb
函数旨在获取可用的 USB 设备并返回一个列表。然而,当在函数中使用return
语句时,它仅返回第一个检测到的设备。
def find_usb(self):
bus = dbus.SystemBus()
ud_manager_obj = bus.get_object("org.freedesktop.UDisks", "/org/freedesktop/UDisks")
ud_manager = dbus.Interface(ud_manager_obj, 'org.freedesktop.UDisks')
devices = []
for dev in ud_manager.EnumerateDevices():
device_obj = bus.get_object("org.freedesktop.UDisks", dev)
device_props = dbus.Interface(device_obj, dbus.PROPERTIES_IFACE)
if device_props.Get('org.freedesktop.UDisks.Device', "DriveConnectionInterface") == "usb" and device_props.Get('org.freedesktop.UDisks.Device', "DeviceIsPartition"):
if device_props.Get('org.freedesktop.UDisks.Device', "DeviceIsMounted"):
device_file = device_props.Get('org.freedesktop.UDisks.Device', "DeviceFile")
devices.append(device_file)
else:
print "Device not mounted"
return devices
devices
来存储设备文件。devices
列表中。devices
列表。def find_usb(self):
bus = dbus.SystemBus()
ud_manager_obj = bus.get_object("org.freedesktop.UDisks", "/org/freedesktop/UDisks")
ud_manager = dbus.Interface(ud_manager_obj, 'org.freedesktop.UDisks')
for dev in ud_manager.EnumerateDevices():
device_obj = bus.get_object("org.freedesktop.UDisks", dev)
device_props = dbus.Interface(device_obj, dbus.PROPERTIES_IFACE)
if device_props.Get('org.freedesktop.UDisks.Device', "DriveConnectionInterface") == "usb" and device_props.Get('org.freedesktop.UDisks.Device', "DeviceIsPartition"):
if device_props.Get('org.freedesktop.UDisks.Device', "DeviceIsMounted"):
device_file = device_props.Get('org.freedesktop.UDisks.Device', "DeviceFile")
yield device_file
else:
print "Device not mounted"
find_usb
来返回设备文件。yield
语句逐个产出设备文件。find_usb
函数时,它将返回一个生成器对象。原创声明:本文系作者授权腾讯云开发者社区发表,未经许可,不得转载。
如有侵权,请联系 cloudcommunity@tencent.com 删除。
原创声明:本文系作者授权腾讯云开发者社区发表,未经许可,不得转载。
如有侵权,请联系 cloudcommunity@tencent.com 删除。