Question

I am having an issue with DBus:

1. I register with DBus dbus_bus_get() method : OK
2. I add filter matches : OK
3. I add a filter callback function: OK
4. I start a dispatch loop through dbus_connection_read_write_dispatch() : OK

Everything works OK. Now, if I insert:

1a. dbus_bus_get_unique_name()

I get a nasty exception message:

arguments to dbus_connection_send_with_reply_and_block() were incorrect, assertion “(error) == NULL || !dbus_error_is_set ((error))” failed in file dbus-connection.c line 3301.

Help please.

Answer 1

After some experimentation, it seems that the function dbus_bus_get_unique_name() must be called from within a specific context. I managed to get a meaningful result when accessing this function through a filter callback function e.g. one registered with dbus_add_filter function.