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From: "ldries46" <bertus.dries@planet.nl>
Newsgroups: comp.lang.ada
References: <57a1973c$0$12033$e4fe514c@news.kpn.nl>
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 <nnsij4$1ddn$1@gioia.aioe.org>
In-Reply-To: <nnsij4$1ddn$1@gioia.aioe.org>
Subject: Re: GtkAda. Printing
Date: Thu, 4 Aug 2016 07:33:01 +0200
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Date: 2016-08-04T07:33:01+02:00
List-Id: <comp.lang.ada>

To check what you said I tried the following just added an extra 
declaration:
Print_OpR : Gtkada_Print_Operation_Record;
and replaced Print_Op with it: The error stayed
Then I changed Print_OpR in On_Draw_Page with Print_OpR'Access.
The Error stayed nut said they expected Gtk_Print_Operation_record.
When I Changed the declaration accordingly The Error said they expected 
Gtkada_Print_Operation_Record
This looks like an infinite loop, and again, my experience wiyh GPS ia that 
somtimes the compiler tries several ways to resolve a problem abd you have 
to find out which of the several Error messages is the solution for you. I 
stll think It is the last one

: expected type "Cb_Gtk_Print_Operation_Gtk_Print_Context_Gint_Void" defined 
at gtk-print_operation.ads:754
: found type access to procedure "Draw_Page" defined at line 191
:   ==> in call to inherited operation "On_Draw_Page" at 
gtkada-printing.ads:102

I still cannot find how to address the draw_page routine ib there

"Dmitry A. Kazakov"  schreef in bericht news:nnsij4$1ddn$1@gioia.aioe.org...

On 2016-08-03 12:25, ldries46 wrote:
> 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.

That depends on whether the operation is primitive or type specific. A
primitive operation is inherited. Draw_Page parameter types are

    access Gtk_Print_Operation_Record'Class;
    not null access Gtk_Context_Record'Class;
    Gint

not

    Gtk_Print_Operation_Record;
    Gtk_Print_Context;
    Gint

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