Re: Extending SQL in C using VARIABLE length type in user defined type

Hi Fabiana,

We will try to help you:)

This email was sent to me only and I'm adding the rest of the list members.

Thanks,
Michael

On Wed, Jun 7, 2017 at 5:59 PM, Fabiana Zioti <fabi_zioti(at)hotmail(dot)com>
wrote:

> I am trying around a little bit with creating my own types using shared
> objects, written in C. The usage of static types with fixed length was
> actually no problem for me, so I proceeded to variable length types. I
> created an n-dimensional point structure called "Geo_Polygon" that contains
> a field of Geo_Point values of dynamic length. Like:
>
>
> typedef struct Geo_Point{
> double x;
> double y;
> int id;
> } Geo_Point;
>
> typedef struct Geo_Polygon{
> int32 v_len;
> Geo_Point pontos[FLEXIBLE_ARRAY_MEMBER];
> } Geo_Polygon;
>
> The Geo_Point works fine.
>
> I don`t know to convert the structure of Geo_polygon to the
> internal/external representation properly.
>
> PG_FUNCTION_INFO_V1(geo_polygon_in);
> PG_FUNCTION_INFO_V1(geo_polygon_out);
>
> I would be very glad, if somebody could provide me some help to this.
> Thank you in advance
>
> Best regards
>
> Fabiana
>
>