From: Ian Clifton <ian.clifton@chem.ox.ac.uk>
Subject: Re: Empty arrays & libdbusada
Date: Wed, 29 Jun 2016 22:49:53 +0100
Date: 2016-06-29T22:49:53+01:00 [thread overview]
Message-ID: <dtiu41Fnv9fU1@mid.individual.net> (raw)
In-Reply-To: slrnnn75i5.3jn.reet@fenrir.codelabs.ch
Reto Buerki <reet@codelabs.ch> writes:
> On 2016-06-28, Ian Clifton <ian.clifton@chem.ox.ac.uk> wrote:
>> I’m trying to learn a bit about controlling programs through D-bus. I
>> can make things happen with the “D-feet” tool, calling methods in
>> ork.gtk.Actions and org.gtk.Application, supplying empty arrays (notated
>> as “[]”) for un‐needed parameters. But when I try to do the equivalent
>> in Ada code using libdbusada, I hit a snag—libdbusada doesn’t seem to be
>> able to handle empty arrays. Does anyone know of a way round this?
>> Thanks,
>
> Can you please provide a concrete example of what you are trying to do?
> What happens if you just remove the empty array arguments?
>
Thanks for replying. At the moment I’m trying to control the play‐back
of a CD using the “Sound Juicer” application on Debian Linux. The
application exposes the “org.gtk.Actions” interface through D-Bus. Using
D-feet, I can toggle playback by calling the “Activate” method with
three arguments:
'play', [], []
i.e. the string 'play' followed by two empty arrays to mark the places
of un‐needed parameters.
If I omit these placeholders in my Ada code I get:
raised D_BUS.D_BUS_ERROR : Type of message, '(s)', does not match
expected type '(sava{sv})'
If I supply empty arrays (uninitialised
D_Bus.Arguments.Containers.Array_Type variables) I get:
raised D_BUS.D_BUS_ERROR : Serialization error: Array is empty
and if I put either empty strings or nonsense strings into containers of
the expected type, my method calls seem to be passed without error but
are ignored by the application.
--
Ian ◎
next prev parent reply other threads:[~2016-06-29 21:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-28 11:19 Empty arrays & libdbusada Ian Clifton
2016-06-29 9:35 ` Reto Buerki
2016-06-29 21:49 ` Ian Clifton [this message]
2016-06-30 7:04 ` Reto Buerki
2016-06-30 20:54 ` Ian Clifton
2016-07-05 15:33 ` Ian Clifton
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