D-Bus
From Openmoko
(explain bus name, object path, proxy object, interface) |
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* [http://www.freedesktop.org/wiki/Software/dbus dbus homepage] | * [http://www.freedesktop.org/wiki/Software/dbus dbus homepage] | ||
* [http://dbus.freedesktop.org/doc/dbus-python/doc/tutorial.html dbus-python tutorial] | * [http://dbus.freedesktop.org/doc/dbus-python/doc/tutorial.html dbus-python tutorial] | ||
− | [[Category:Software]] | + | [[Category:Software ]] |
+ | [[Category:Application Developer]] |
Revision as of 04:46, 11 March 2008
OpenMoko uses D-Bus, a message bus system which provides a simple way for applications to talk to one another and to be available as services in the system. If the application providing the service is not running when a message is sent, the application will be started.
There are two separate busses: a system bus for root which runs whenever the phone is on, and a session bus which is started for the user when X starts.
Contents |
Session bus services
These can at least be defined in /usr/share/dbus-1.0/services/ and /usr/share/dbus-1/services/
- org.openmoko.Dialer
- org.gnome.evolution.dataserver.AddressBook
- org.gnome.evolution.dataserver.Calendar
- org.gnome.GConf
- ...
System bus services
There is information about these in /etc/dbus-1/system.d/
- org.freedesktop.Avahi
- org.bluez.*
- ...
Accessing the services
Command line
For simple uses, there's a command dbus-send.
For example, to dial a number:
dbus-send --print-reply --dest="org.openmoko.Dialer" /org/openmoko/Dialer org.openmoko.Dialer.Dial string:12345
Python
To use D-Bus in Python, the package python-dbus needs to be compiled and installed.
To dial a number:
#!/usr/bin/env python import dbus bus = dbus.SessionBus() proxy = bus.get_object("org.openmoko.Dialer", "/org/openmoko/Dialer") interface = dbus.Interface(object, "org.openmoko.Dialer") interface.Dial("12345") # or this: proxy.Dial("12345", dbus_interface="org.openmoko.Dialer")
The first "org.openmoko.Dialer" is the bus name of the service on the bus and "/org/openmoko/Dialer" is an object path in the service. Before calling a method on the object via the proxy object we still need to specify which interface the method belongs to: the second (and third) "org.openmoko.Dialer". Finally "Dial" is the method in the interface.