[英]receive dbus signals with python
我正在嘗試制作一個 python 腳本,它通過 dbus 偵聽信號並將它們存儲在一個文件中,因為我需要接收信號的服務發送一個始終在變化的哈希密碼。 我已經閱讀了這些手冊,但由於我對 Python 一無所知,因此我需要任何幫助。
import sys
import traceback
import gobject
import dbus
import dbus.mainloop.glib
def handle_reply(msg):
print msg
def handle_error(e):
print str(e)
def emit_signal():
#call the emitHelloSignal method
object.emitHelloSignal(dbus_interface="com.example.TestService")
#reply_handler = handle_reply, error_handler = handle_error)
# exit after waiting a short time for the signal
gobject.timeout_add(2000, loop.quit)
if sys.argv[1:] == ['--exit-service']:
object.Exit(dbus_interface='com.example.TestService')
return False
def hello_signal_handler(hello_string):
print ("Received signal (by connecting using remote object) and it says: "
+ hello_string)
def catchall_signal_handler(*args, **kwargs):
print ("Caught signal (in catchall handler) "
+ kwargs['dbus_interface'] + "." + kwargs['member'])
for arg in args:
print " " + str(arg)
def catchall_hello_signals_handler(hello_string):
print "Received a hello signal and it says " + hello_string
def catchall_testservice_interface_handler(hello_string, dbus_message):
print "com.example.TestService interface says " + hello_string + " when it sent signal " + dbus_message.get_member()
if __name__ == '__main__':
dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
bus = dbus.SessionBus()
try:
object = bus.get_object("com.example.TestService","/com/example/TestService/object")
object.connect_to_signal("HelloSignal", hello_signal_handler, dbus_interface="com.example.TestService", arg0="Hello")
except dbus.DBusException:
traceback.print_exc()
print usage
sys.exit(1)
#lets make a catchall
bus.add_signal_receiver(catchall_signal_handler, interface_keyword='dbus_interface', member_keyword='member')
bus.add_signal_receiver(catchall_hello_signals_handler, dbus_interface = "com.example.TestService", signal_name = "HelloSignal")
bus.add_signal_receiver(catchall_testservice_interface_handler, dbus_interface = "com.example.TestService", message_keyword='dbus_message')
# Tell the remote object to emit the signal after a short delay
gobject.timeout_add(2000, emit_signal)
loop = gobject.MainLoop()
loop.run()
任何幫助表示贊賞
您可以使用 dbus-monitor 檢查信號是什么樣的
dbus-monitor --system "type='signal',sender='org.bluez'"
下面是我接收信號的python3示例代碼:
import dbus
from gi.repository import GLib
from dbus.mainloop.glib import DBusGMainLoop
def signal_handler(*args, **kwargs):
for i, arg in enumerate(args):
print("arg:%d %s" % (i, str(arg)))
print('kwargs:')
print(kwargs)
print('---end----')
DBusGMainLoop(set_as_default=True)
bus = dbus.SystemBus()
#register your signal callback
bus.add_signal_receiver(signal_handler,
bus_name='org.bluez',
interface_keyword='interface',
member_keyword='member',
path_keyword='path',
message_keyword='msg')
loop = GLib.MainLoop()
loop.run()
修改 bus_name/sender 以適合您的情況
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