Q: How to update connection user_data

[Alec Leamas]

Dear list,

This is my first attempts to actually code any DBus stuff.  The first 
stop is to create some unit tests. This mostly seems to work using the 
the "official" example code, notably [1].

However, I run into problems trying to use the "user_data" pointer 
provided to g_bus_own_name(). If I read the documents correctly 
(probably not...) this argument to g_bus_own_name is will later be 
visible in the  method call handler, in my case indeed named 
HandleMethodCall().

Which works fine in my first unit test. This test ends up in

     if (owner_id) g_bus_unown_name(owner_id);
     g_dbus_node_info_unref(introspection_data);

In next unit test, I once again invoke g_bus_own_name() with a new 
user_data value. However, in HandleMethodCall() the user_data is still 
the same as in the first test -> crash.

For the moment, I work around this using a new static_user_data variable 
which makes the updated pointer available in a static context. Needless 
to say, this is far from satisfactory.

Any clues out there how I could persuade gdbus to update the user_data 
pointer?

Complete code in [2]. The relevant parts are include/dbus_handler.cpp, 
src/dbus_handler.cpp and test/tests.cpp.


Cheers!
--alec




[1] 
https://github.com/bratsche/glib/blob/master/gio/tests/gdbus-example-server.c
[2] https://github.com/leamas/OpenCPN/tree/user_data