Re: [Caml-list] LablGTK Reading Properties

["Olivier Andrieu" <oandrieu@nerim.net>]

Hi,

On Feb 5, 2008 5:39 PM, Gregory Malecha <gmalecha@rice.edu> wrote:
> Hi,
>
> I've been working on some code with GnomeCanvas and I'm having
> difficulty reading properties off of objects. For example, I've created
> a polygon and I want to read the points from it, but I always get back
> None. Here's my current code:
>
> let points item =
>   let prop = {Gobject.name = "points";
>           Gobject.conv = GnomeCanvas.Conv.path_def} in
>   let x = Gobject.get prop item in
>   match x with
>     None -> print_string "NONE!\n"; [] (* I always end up in this case *)
>   | Some ary ->
>       print_string "SOME!\n";
>       let ary = GnomeCanvas.Conv.get_points ary in
>       Array.to_list ary

you're getting None because you're using the wrong conversion
function: this "points" property is basically a float array and here
you're using the path_def conversion which is for bpath (bezier path).

Your code should work with:
    let prop = {Gobject.name = "points"; conv = GnomeCanvas.Conv.points} in ...

-- 
  Olivier