Using pointers in arguments of a signal via DBus

[Paul Aurich]

Everyone ignore how badly Thunderbird fubared up the Followup-To header,
thanks.

On 2010-07-20 20:19, Paul Aurich wrote:
> This is probably a better question for the devel mailing list
> 
> On 2010-07-20 10:19, Liangent wrote:
>> Hi,
>>
>> I'm listening to a signal in Python via DBus with the following code:
>>
>> def cb_jabber_receiving_message(gc, type, id, from_, to, message):
>>     # some code ...
>>
>> bus.add_signal_receiver(
>>     cb_jabber_receiving_message,
>>     dbus_interface = 'im.pidgin.purple.PurpleInterface',
>>     signal_name = 'JabberReceivingMessage',
>> )
>>
>> I cannot figure out how the message argument can be used. I tried some
>> Xmlnode* functions exported via DBus, but they always fail with
>> "DBusException: im.pidgin.purple.InvalidHandle: xmlnode object with ID
>> = 729930 not found" (where 729930 is the value of message argument). I
>> guess the reason is that the xmlnode was freed before DBus function's
>> invoking, then how can I read the content of message?
> 
> You are correct that the xmlnode is going to be destroyed before
> libpurple gets around to processing your dbus request to fetch the
> xmlnode's data.
> 
> Hmm, I thought there was a jabber-receiving-text signal, but it doesn't
> look like there is.  If it existed, you could watch on that and parse
> the data yourself (ugly).
> 
> OTOH, I can think of two "solutions", neither of which are great:
>    * Develop your code as a native plugin (either C, Perl, or TCL),
> which have synchronous access to things like that xmlnode
>    * Code up a shim plugin which *just* binds to the signals you care
> about, turns around and emits a new signal with the output of
> xmlnode_to_str().
> 
> Someone else may have a better idea or some other alternatives.
> 
> ~Paul

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