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使用 PyQt 进行 DBus 编程

tag-icon • tag-icon python dbus pyqt
使用 PyQt 进行 DBus 编程

我正在尝试编写一个支持全局菜单的桌面环境 在开始我的主要任务之前，我在 PyQt 中尝试使用 dbus 代码QtDBus作为概念证明。这是我从 d-feet 获得的漂亮打印输出和方法签名：

GetMenus() -> (Array of [Struct of (Uint32,String,Object Path)] menus)

[(60817412L, u':1.155', '/com/canonical/menu/3A00004'),
 (58725289L, u':1.151', '/com/canonical/menu/38013A9'),
 (58720393L, u':1.151', '/com/canonical/menu/3800089'),
 (62916305L, u':1.159', '/com/canonical/menu/3C006D1'),
 (54526127L, u':1.129', '/com/canonical/menu/34000AF'),
 (58725701L, u':1.151', '/com/canonical/menu/3801545'),
 (25167093L, u':1.22', '/com/canonical/menu/18004F5'),
 (58726237L, u':1.151', '/com/canonical/menu/380175D'),
 (60825279L, u':1.155', '/com/canonical/menu/3A01EBF'),
 (58721371L, u':1.151', '/com/canonical/menu/380045B'),
 (25165828L, u':1.22', '/com/canonical/menu/1800004')]

这是我在 PyQt 中编写的代码，期望得到类似的效果：

from PyQt4.QtGui import QApplication
from PyQt4.QtDBus import QDBus
from PyQt4.QtDBus import QDBusConnection
from PyQt4.QtDBus import QDBusInterface

desktop = QApplication([])
session_bus_connection = QDBusConnection.sessionBus()
service_name = 'com.canonical.AppMenu.Registrar'
service_path = 'com/canonical/AppMenu/Registrar'
interface = 'com.canonical.AppMenu.Registrar'
menu = QDBusInterface(service_name, service_path, interface, QDBusConnection.sessionBus())
reply = menu.call('GetMenus')
print reply.arguments()
desktop.exec_()

这是我从上面的代码实际得到的输出：

christopher@xx-pc:~/Documents/Code$ python desktop_dbus.py
process 2613: arguments to dbus_message_new_method_call() were incorrect, assertion "_dbus_check_is_valid_path (path)" failed in file ../../dbus/dbus-message.c line 1204.
This is normally a bug in some application using the D-Bus library.
process 2613: arguments to dbus_message_set_auto_start() were incorrect, assertion "message != NULL" failed in file ../../dbus/dbus-message.c line 2885.
This is normally a bug in some application using the D-Bus library.
process 2613: arguments to dbus_message_iter_init_append() were incorrect, assertion "message != NULL" failed in file ../../dbus/dbus-message.c line 2284.
This is normally a bug in some application using the D-Bus library.
QDBusConnection: error: could not send message to service "com.canonical.AppMenu.Registrar" path "com/canonical/AppMenu/Registrar" interface "org.freedesktop.DBus.Introspectable" member "Introspect": 
[]

谁能告诉我为什么消息没有发送？

答案1

答案基于此评论经过杰德：

process 2613: arguments to dbus_message_new_method_call() were incorrect
 assertion "_dbus_check_is_valid_path (path)" failed in file ../../dbus/dbus-message.c line 1204.
This is normally a bug in some application using the D-Bus library.

这表明问题出在您的 上service_path。所有 DBus 路径都以 开头/，因此您应该更改

service_path = 'com/canonical/AppMenu/Registrar'

到

service_path = '/com/canonical/AppMenu/Registrar'

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