Re: [Vala] Using a C library

["Dr. Michael Lauer" <mickey vanille de>]

> Lastly, a question about gobject introspection. I'm totally clueless about
> this. So my plan on my project is to release in 3-4/5 parts. The first part
> will be the vapi, and a sensible OOP Vala library. The second part is Vala
> program that provides a DBus interface to Spotify that obviously any
> program could use. The third part is a GTK+ GUI program to interact with
> the DBus interface. The fourth part is Gnome Gjs extension that interacts
> with the DBus service. The last part, highly depending on popularity, is a
> Unity and/or KDE extension that is a port of Gjs extension. Back to the
> original question, is that first part (vapi + OOP library) applicable to
> use by for GObject introspection or would they other programs need to
> interface with the DBus service?

It’s up to you to decide how you want to make the functionality available
and it depends on whether you want a daemon to demultiplex service requests
or let everything concurrently flow through the library interface and let it
deal with demultiplexing.

I don’t know about spotify, but the usual approach for services where
multiple clients written in multiple languages can benefit is to provide the library interface,
create a daemon (using said library interface) which exposes a D-Bus interface and then have
clients in whatever language using that D-Bus interface.

If you want to write the daemon in Vala, you might want to write a dbus introspection
(and documentation) file and use vala-dbus-binding-tool 
(https://github.com/freesmartphone/vala-dbus-binding-tool 
<https://github.com/freesmartphone/vala-dbus-binding-tool>)
to have it create the stubs. The interface documentation could look like that

http://www.freesmartphone.org/specs/org.freesmartphone.GSM.Call/ 
<http://www.freesmartphone.org/specs/org.freesmartphone.GSM.Call/>

Cheers,

:M: