Re: [Vala] Properly wrapping callbacks

[Frederik <scumm_fredo gmx net>]

Frederik wrote:
> Michael 'Mickey' Lauer wrote:
> > Hi,
> >
> > I'm working on my first binding for a non-gobject library -- please see 
> > gsm0710_p.h.
> >
> > My current vapi is also attached. I'm struggling with setting the callback 
> > pointers now. How should the callbacks in my .vala object be defined so that 
> > I can set them via e.g. 
> >
> > <callback>
> >
> > var ctx = new Context();
> > ctx.at_command = <callback>
> >
> > Cheers,
> >
> > Mickey.
>
> You should make your delegate non-static, since an instance gets passed.
> In your case the instance gets passed as first parameter and not as last
> parameter, so you must add [CCode [instance_pos = 0)]. And 'char*'
> translates to 'string' in Vala.
>
>   [CCode [instance_pos = 0)]
>   public delegate int at_command_t (string command);

However, if it is meant as source object for some kind of event and not
as instance you should mark it as static and pass the context explicitly:

  public static delegate int at_command_t (Context ctx, string command);

Regards,

Frederik