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From: "ldries46" <bertus.dries@planet.nl>
Newsgroups: comp.lang.ada
References: <57a1973c$0$12033$e4fe514c@news.kpn.nl>
 <nns747$s6g$1@gioia.aioe.org>
In-Reply-To: <nns747$s6g$1@gioia.aioe.org>
Subject: Re: GtkAda. Printing
Date: Wed, 3 Aug 2016 12:25:17 +0200
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Xref: news.eternal-september.org comp.lang.ada:31266
Date: 2016-08-03T12:25:17+02:00
List-Id: <comp.lang.ada>

Yes Print is declared as Gtkada_Print_Operation; and still in the Call to 
routine Set_N_Pages(Print_Op, 1); the compiler does not find an error while 
the declaration is

procedure Set_N_Pages
   (Self    : not null access Gtk_Print_Operation_Record;
    N_Pages : Gint);

and

type Gtkada_Print_Operation_Record is new
  Gtk_Print_Operation_Record with private;
type Gtkada_Print_Operation is access all Gtkada_Print_Operation_Record;

I expect that in the compiler to react the same in simular cases. Therefore 
I think that the error in lines 190:30 is the real error and the one I asked 
about.

"Dmitry A. Kazakov"  schreef in bericht news:nns747$s6g$1@gioia.aioe.org...

On 2016-08-03 09:02, ldries46 wrote:

> 190:07: missing argument for parameter "Slot" in call to "On_Draw_Page"
> declared at gtk-print_operation.ads:769
> 190:20: expected an access type with designated type
> "Gtk_Print_Operation_Record" defined at gtk-print_operation.ads:98
> 190:20: found type "Gtkada_Print_Operation" defined at
> gtkada-printing.ads:104

The compiler told you everything you need. You use an instance of
Gtkada_Print_Operation instead of access Gtk_Print_Operation_Record.

The types are declared as follows:

type Gtkada_Print_Operation_Record is
    new Gtk_Print_Operation_Record with private;
type Gtkada_Print_Operation is access all Gtkada_Print_Operation_Record;

P.S. Granted, it seems a glitch in the GtkAda bindings which should have
used access Gtk_Print_Operation_Record'Class instead. But nothing you
could not workaround with an explicit type conversion...

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de