[Vala] xcb vapi

[Stefan Risberg <steffenomak gmail com>]

is it broken in the newest vala? Or am I doing something wrong?

I "know" how to fix it but I don't have a clue if I'm actually just
doing something bad.

Here is some badly written code that prohibits compilation.

class Main : GLib.Object
{
        Main()
        {
                int screen_num;
                Xcb.Connection conn = new Xcb.Connection(null, out screen_num);
                Xcb.Screen screen = get_screen(conn, screen_num);

                stdout.printf ("\n");
                stdout.printf ("  width.........: %d\n", screen.width_in_pixels);
                stdout.printf ("  height........: %d\n", screen.height_in_pixels);
                stdout.printf ("  white pixel...: %ld\n", screen.white_pixel);
                stdout.printf ("  black pixel...: %ld\n", screen.black_pixel);
                stdout.printf ("\n");
                Xcb.Window win = conn.generate_id();

                conn.create_window(Xcb.COPY_FROM_PARENT,
                                                   win,
                                                   screen.root,
                                                   0, 0,
                                                   600, 400,
                                                   0,
                                                   Xcb.WindowClass.INPUT_OUTPUT,
                                                   screen.root_visual,
                                                   0, null);

                conn.map_window(win);
                conn.flush();

                SDL.Timer.delay(3000);
        }

        Xcb.Screen get_screen(Xcb.Connection conn, int screen_num)
        {
                Xcb.Setup setup = conn.get_setup();
                Xcb.ScreenIterator iter = setup.roots_iterator();

                for(int i = 0; i < screen_num; i++)
                        Xcb.ScreenIterator.next(ref iter);

                return iter.data;
        }

        public static int main(string[] args)
                {
                        new Main();
                        return 0;
                }
}

It will complain that XcbVisualID doesn't exist but in the vapi it
looks like this
public struct VisualID : uint32
{}

but I changed it to
[CCode (cname = "unsigned int")]

and it worked. There are other places that complain about the same
stuff, but this was the easiest to describe.

So am I doing something wrong, if not how should the correct way to
fix the problem above?