Bluez-obex和python opp服务器，如何改变文件存储的位置?

Question

我正在使用bluez-obex创建一个基于python的opp obex服务器，但我在更改目录时遇到了麻烦。我基于此编写代码，并将其转换为具有文件路径作为输入的类。我一直得到KeyError: 'object does not export any interfaces; you might need to pass object path as the 2nd argument for get()'和我当前的代码。我是不是走错了路?我的类代码和调用函数如下:

from gi.repository import GLib
import pydbus
class opp_server():
def __init__(self, path):
self.BUS_NAME = 'org.bluez.obex'
self.PATH = '/org/bluez/obex'
self.AGENT_MANAGER_INTERFACE = 'org.bluez.obex.AgentManager1'
self.AGENT_INTERFACE = 'org.bluez.obex.Agent1'
self.SESSION_INTERFACE = 'org.bluez.obex.Session1'
self.TRANSFER_INTERFACE = 'org.bluez.obex.Transfer1'
self.ses_bus = pydbus.SessionBus()
self.path = path
def transfer_status_handler(self, iface, props_changed, props_removed):
if iface == self.TRANSFER_INTERFACE:
status = props_changed.get('Status')
if status == 'complete':
print('Transfer complete')
elif status == 'queued':
print('Still queued')
elif status == 'active':
print('transferring')
elif status == 'suspended':
print('Suspended')
elif status == 'error':
print('error')
def iface_added_handler(self, dbus_path, interfaces):
if self.SESSION_INTERFACE in interfaces and 'server' in dbus_path:
print('Server session added')
elif self.TRANSFER_INTERFACE in interfaces and 'server' in dbus_path:
print('Transfer started')
transfer = self.ses_bus.get(self.BUS_NAME, dbus_path)
transfer.onPropertiesChanged = self.transfer_status_handler

def AuthorizePush(self):
print('Authorize Push', self.path)
transfer = self.ses_bus.get(self.BUS_NAME, self.path)
props = transfer.GetAll(self.TRANSFER_INTERFACE)
print(props)
return props.get('Name')
def Cancel(self):
print('Authorization Cancelled')
def Release(self):
pass

def server(self):
obex_mngr = self.ses_bus.get('org.bluez.obex', '/')
obex_mngr.onInterfacesAdded = self.iface_added_handler
mainloop = GLib.MainLoop()
self.ses_bus.register_object('/test/agent', self.AuthorizePush(), None)
print('Agent created')
agnt_mngr = ses_bus.get(self.BUS_NAME, self.PATH)
agnt_mngr.RegisterAgent('/test/agent')
print('Agent registered')
try:
mainloop.run()
except KeyboardInterrupt:
mainloop.quit()

调用类

server = servertest.opp_server('/home/pi/GAMMA/ImageData')
server.server()

Answer 1

看起来您混淆了DBus对象路径和文件系统路径。对于AuthorizePush，输入是org.bluez.obex.Transfer1接口的DBus对象路径，但您正在尝试使用文件系统路径，您希望将文件放在哪里。

当您发布/导出org.bluez.obex.Agent1接口时，您需要具有相同参数的三个方法。关于导出自己的对象的pydbus教程可能值得一看

obexd以:/usr/share/dbus-1/services/org.bluez.obex.service中的信息开始，对我来说是:

[D-BUS Service]
Name=org.bluez.obex
Exec=/usr/lib/bluetooth/obexd
SystemdService=obex.service

obexd可以用其他选项启动，可以从帮助中看到:

$ /usr/lib/bluetooth/obexd -h
Usage:
obexd [OPTION?]
Help Options:
-h, --help                  Show help options
Application Options:
-d, --debug=DEBUG           Enable debug information output
-p, --plugin=NAME,...       Specify plugins to load
-P, --noplugin=NAME,...     Specify plugins not to load
-n, --nodetach              Run with logging in foreground
-r, --root=PATH             Specify root folder location. Both absolute and relative can be used, but relative paths are assumed to be relative to user $HOME folder. Default $XDG_CACHE_HOME
-S, --root-setup=SCRIPT     Root folder setup script
-l, --symlinks              Allow symlinks leading outside of the root folder
-c, --capability=FILE       Specify capability file, use '!' mark for scripts
-a, --auto-accept           Automatically accept push requests

所以你可以使用--root=PATH选项来改变默认位置。

如果您确实想要更改代码中的路径，那么您需要使从AuthorizePush返回的值具有绝对路径。例句:

def AuthorizePush(self, path):
transfer = ses_bus.get(BUS_NAME, path)
props = transfer.GetAll(TRANSFER_INTERFACE)
return '/tmp/' + props.get('Name')

这将把文件放在/tmp目录。