dbus - 在 Gjs / Gnome Shell 中调用 DBus 方法

Question

如果我有总线名称、对象路径和接口，我如何从 Gjs（在 gnome-shell 扩展中）调用 DBus 方法？

我正在寻找以下 python 代码的等价物：

import dbus
bus = dbus.SessionBus()
obj = bus.get_object("org.gnome.Caribou.Keyboard", "/org/gnome/SessionManager/EndSessionDialog")
obj.Open(0, 0, 120, dbus.Array(signature="o"))

（请注意，由于某些 python-dbus 魔术，我没有显式使用该接口，但我可以使用iface = dbus.interface(obj, "org.gnome.SessionManager.EndSessionDialog")。由于我有接口名称，我可以使用查询它的解决方案。另请注意，此示例将是在 Gjs 中很傻，因为它回调到 gnome-shell）

Answer 1

The import imports.dbus is deprecated since gnome-shell 3.4. The new way is to use Gio as described here:

const Gio = imports.gi.Gio;

const MyIface = '<interface name="org.example.MyInterface">\
<method name="Activate" />\
</interface>';
const MyProxy = Gio.DBusProxy.makeProxyWrapper(MyIface);

let instance = new MyProxy(Gio.DBus.session, 'org.example.BusName',
'/org/example/Path');

(Note that the original post uses makeProxyClass, correct is makeProxyWrapper.)

You can get the interface definition, for example, by using introspection. For pidgin/purple do:

$ dbus-send --print-reply --dest=im.pidgin.purple.PurpleService \
/im/pidgin/purple/PurpleObject org.freedesktop.DBus.Introspectable.Introspect

Further explanations on introspection and inspection of interfaces can be found here.

Answer 2

这应该给你一个更好的主意：

gjs> const DBus = imports.dbus;
gjs> for (let i in DBus) log(i);