Re: how to wrap arrays?

[Andreas Rottmann]

John Steele Scott <address@hidden> writes:

> Hi,
>
> Just for fun, I am using g-wrap to interface the cairo graphics library
> with guile. Thankfully this library has quite a wrapper-friendly
> interface, but I don't know how to do this one:
>
>   void cairo_set_dash(cairo_t *cr, 
>                       const double *dashes,
>                       int num_dashes,
>                       double offset);
>
> The num_dashes argument gives the number of values pointed to by
> dashes, and it may be 0.
>
> Ideally I'd like to be able to have a Scheme function which could be
> called like:
>
>   (cairo-set-dash cr (list 1.0 3.0 1.5 2.5) 2.5)
>
> Where dashes and num_dashes can be supplied based on the values and
> length of the list. But at the moment I don't know see how to handle
> the dashes argument at all. Any help would be appreciated.
>
G-Wrap currently doesn't support this (yet); a half-manual wrapper
must be written, consisting of an override and a C part:

The override:

(define-function gtk_stock_add
  (c-name    "_wrap_gtk_stock_add")
  (overrides "gtk_stock_add")
  (return-type "none")
  (parameters
   '("SCM" "items")))

C part:

void
_wrap_gtk_stock_add (SCM items)
{
  ...
}

HTH, Rotty
-- 
Andreas Rottmann         | address@hidden      | address@hidden | address@hidden
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