Re: Glib / GObject newbie

["Padraig O'Briain" <Padraig Obriain Sun COM>]

Have a look at atkobect.c in atk. I think this does something similar to 
what you want to do.

Padraig

Laurent JALLET wrote:

> Hi all,
>
> I'm developping an application in C and I'd like to use the GObjects 
> (and later GTypeModule).
> I'm not using GTK, I just want to "program Object Oriented with C".
>
> I've studied Mathieu Lacage's Gobject sample (maman_bar etc.) and I've 
> created some 'simple' classes but I 'd like to implement a Gobject 
> containing other Gobjects. And I don't know how to write the 
> get/set_property for a Gobject.
> I'm sorry I'm not very clear.
>
> hum...
> that's what I want to implement using GObjects :
> . a Camera containing a position ( => Vector3 : a GObject containing 3 
> gfloats) and other members
>
>
> so I've got :
> typedef struct t_Camera Camera;
> typedef struct t_CameraPrivate CameraPrivate;
>
> struct t_Camera {
>   GObject parent;
>   /* instance members */
>   CameraPrivate *priv;
> };
>
> and
> struct t_CameraPrivate
> {
>   gfloat mFov;
>   Vector3 mPosition;
> // and other members ...
> };
>
> and I'd like to write
> static void
> camera_get_property (GObject *object,  guint property_id,  const 
> GValue *value, GParamSpec   *pspec)
> {
>        Camera *self = (Camera *) object;
>
>         switch (property_id) {
>         case CAMERA_FOV: {
>                 g_value_set_float (value, self->priv->mFov);
>         }
>                 break;
>
>         case CAMERA_POSITION :
>         // There is my problem
>         // I don't know what to do
>  
> How can I transform a GValue into a GObject ?
> And how do I use it ?
>
> Of course there's the same problem with the camera_set_property function.
>
>
> I don't really understand what GValue is and how I can use it.
>
> I hope you understand my problem and I thank you in advance.
>
> L.J.
>
>
>
>
>
>
>
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