我正在尝试编写一个监听 DBus 信号的扩展,但我不知道路径。实际上,有多个路径(对于实现该接口的每个应用程序都是唯一的)。似乎没有办法提前确定路径(即在应用程序启动时),所以我只能监听发送某个 DBus 命令时发出的信号。我真正寻找的是 GJS 等效于 Python 解决方案这问题。不幸的是,各种 DBus 代理不允许null
或undefined
作为路径的值,就像 Python 库一样。我也尝试使用imports.dbus.session.watch_signal
收到所有发射的信号,但无法让我将发送者与特定信号联系起来。
答案1
我不熟悉 GJS(绝对值得研究)但是,如果有 GJS 命令行界面,那么dbus-monitor
可以通过任何消息属性跟踪 d-bus。
引用man dbus-monitor
:
EXAMPLE
Here is an example of using dbus-monitor to watch for the gnome typing
monitor to say things
dbus-monitor "type='signal', \
sender='org.gnome.TypingMonitor', \
interface='org.gnome.TypingMonitor'"
和
In order to get dbus-monitor to see the messages you are interested in,
you should specify a set of watch expressions as you would expect to be
passed to the dbus_bus_add_match function.
并引用D-Bus:消息总线 API:dbus_bus_add_match 函数:
Possible keys you can match on are type, sender, interface, member,
path, destination and numbered keys to match message args
(keys are 'arg0', 'arg1', etc.). Omitting a key from the rule indicates
a wildcard match. For instance omitting the member from a match rule but
adding a sender would let all messages from that sender through regardless
of the member.
请注意,发送者在以下输出中被识别
输出过多的问题
dbus-monitor "type='signal'"
例如
...
signal sender=:1.47 -> dest=(null destination) serial=1679 path=/org/ayatana/bamf/application311805604; interface=org.freedesktop.DBus.Properties; member=PropertiesChanged
string "org.ayatana.bamf.view"
array [
dict entry(
string "Active"
variant boolean true
)
]
array [
]
...
signal sender=:1.51 -> dest=com.canonical.Unity.Panel.Service serial=1674 path=/com/canonical/Unity/Panel/Service; interface=com.canonical.Unity.Panel.Service; member=ReSync
string "libappmenu.so"
...
signal sender=:1.51 -> dest=com.canonical.Unity.Panel.Service serial=1681 path=/com/canonical/Unity/Panel/Service; interface=com.canonical.Unity.Panel.Service; member=ReSync
string "libdatetime.so"
...
可以通过以下方式修剪,或使用以下方式组合修剪:
dbus-monitor --profile "type='signal'"
dbus-monitor "type='signal'" | grep '...some pattern...'
dbus-monitor "type='signal', interface='...'"
或者用另一个键代替接口
ETC。
signal
最后一种变体可能最适合在 d-bus 上找到"that implements the interface"
。