[英]dbus - register object to remote on interface NULL
I have to deal with a binary blob dbus service/server which I need to connect to via dbus (session). 我必须处理需要通过dbus(会话)连接到的二进制blob dbus服务/服务器。
The introspection of the interface is as following (obtained via gdbus-codegen
). 接口的自检如下(通过
gdbus-codegen
获得)。 We register a function to the remote so we get notified if a message has been received by the remote which is called message_handler
. 我们向遥控器注册了一个函数,因此如果遥控器收到了一条称为
message_handler
的消息,则会得到通知。 That happens as a response on a send_message
command which I pass via dbus, but that works (and is thus not shown). 这种情况是作为对我通过dbus传递的
send_message
命令的响应而发生的,但是它有效(因此未显示)。
In a java example it is done via 在一个Java示例中,它是通过
dbus_connection.exportObject("/", new DBusInterfaceDerivedClassFoo());
and shows in bustle
as (no interface) message_handler
and everything works as expected. 并在节目
bustle
的(no interface) message_handler
按预期工作和一切。
In the bare logs say <none>
instead of (no interface)
. 在裸日志中,说
<none>
而不是(no interface)
。
According to gdbus-monitor - interface `<none>` this is caused by the fact that gdbus-monitor
detects interface
being NULL
根据gdbus-monitor-接口`<none>`,这是由于
gdbus-monitor
检测到interface
为NULL
所致
How to register/export a object with interface equal NULL using GDBus
? 如何使用
GDBus
注册/导出接口等于NULL的对象?
Things tried so far marked as comments in the code: 到目前为止,已尝试在代码中标记为注释的事物:
Code chunk: 代码块:
static gchar iface_xml[] =
"<node name='/'>"
" <interface name='bar.long.long.name.rxobj'>"
" <method name='message_handler' >"
" <arg type='s' direction='in'/>"
" </method>"
" <method name=isRemote' >"
" <arg type='b' direction='out'/>"
" </method>"
" </interface>"
" <interface name='org.freedesktop.DBus.Introspectable'>"
" <method name='Introspect'>"
" <arg type='s' direction='out'/>"
" </method>"
" </interface>"
" <interface name='org.freedesktop.DBus.Peer'>"
" <method name='Ping'>"
" </method>"
" </interface>"
"</node>";
GError *error = NULL;
GDBusConnection *con = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, &error);
g_assert (!error);
GDBusNodeInfo *node_info = g_dbus_node_info_new_for_xml (iface_xml, &error);
// also tried ...de_info = NULL; // - crash, see below
g_assert (!error);
GDBusInterfaceInfo *interface_info = g_dbus_node_info_lookup_interface (node_info,
"bar.long.long.name.rxobj");
// also tried ...okup_interface (node_info, NULL); - obviously wrong
g_assert (interface_info);
guint id = g_dbus_connection_register_object (con,
(const gchar*)"/",
// also tried node_info->interfaces[0]
// also tried "" - crash
// also tried "\0" - crash
// also tried NULL - assert failure
interface_info,
&vtable, /*we never enter any of the callbacks*/
NULL,/*user_data*/
(GDestroyNotify)NULL,
&error);
g_assert (!error);
GMainLoop *loop = g_main_loop_new (...);
g_main_loop_run (loop);
...
No matter of what I commented out I never even entered the callbacks specified in vtable
. 无论我发表什么评论,我都从未输入
vtable
指定的回调。
Thanks in advance for any tips. 在此先感谢您提供任何提示。
Additional info: The remote uses qtdbus as far as I can say if that does matter. 附加信息:据我所知,遥控器使用qtdbus确实很重要。
It is not about exporting the interface on NULL interface (not covered by the spec), but about the service/server actually handling such a call properly. 这与在NULL接口(规范未涵盖)上导出接口无关,而与服务/服务器实际正确处理此类调用有关。
This was not yet implemented in gdbus, filed a bug (including patch) https://bugzilla.gnome.org/show_bug.cgi?id=706675 这尚未在gdbus中实现,已提交错误(包括补丁) https://bugzilla.gnome.org/show_bug.cgi?id=706675
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