access to custom object properties in plugin

[lidiriel <lidiriel coriolys org>]

lidiriel wrote:
> Hello,
>
> now i stop my python development and i began a new export filter in C.
> I created fews objects in new lib and i try to generate an export file.
> I use the method :
> static void draw_object(DiaRenderer *self, DiaObject *object) for 
> detected each object and generate a piece of export file.
> it 's work but i have many warning message in terminal like :
>
> ** (dia:12635): WARNING **: IvrRenderer::draw_line not implemented!
> ** (dia:12635): WARNING **: IvrRenderer::draw_line not implemented!
> ** (dia:12635): WARNING **: IvrRenderer::draw_line not implemented!
> ** (dia:12635): WARNING **: IvrRenderer::set_line_style not implemented!
> ** (dia:12635): WARNING **: IvrRenderer::set_line_join not implemented!
> ** (dia:12635): WARNING **: IvrRenderer::set_line_caps not implemented!
> ** (dia:12635): WARNING **: IvrRenderer::fill_polygon not implemented!
> ** (dia:12635): WARNING **: IvrRenderer::draw_line not implemented!
> ** (dia:12635): WARNING **: IvrRenderer::draw_line not implemented!
> ** (dia:12635): WARNING **: IvrRenderer::draw_line not implemented!
>
> In my code i'm not implemented this method because i would like work 
> only with my object.
> How to make this normally ? (and for suppress the message)
Ok I don't use "data_render" methode in my export plugin.
for the same use i create a new function (for no warning message :) ) 
It's work perfectly i detect the type of my object. But for the core of 
plugin i must use the property of object. Example i have an object :

dia/objects/Bay/boundary.c
...
typedef enum { BAY_BOUNDARY_BEGIN,						 BAY_BOUNDARY_END } 
BayBoundaryValue;

/* Object Boundary definition */
typedef struct _Boundary {
  Element element;

  ConnectionPoint connections[BAY_BOUNDARY_NUM_CNX];

	/* Custom inner color */
  Color fill_color;

	/* boundary type */
  BayBoundaryValue value;
}
...

and in my plugin  : dia/plugin/foo/render_foo.c
I have an object DiaObject *obj with the type defined in boundary.c
it's good BUT now i would like acces to property "value" ??
My question is  : How to do that ?

Lidiriel.