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Date: Wed, 15 Sep 2021 19:29:57 -0700 (PDT)
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Subject: Les Callback en Ada
From: Danielle Mandi Mayagha <dmandimayagha@gmail.com>
Injection-Date: Thu, 16 Sep 2021 02:29:57 +0000
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Salut Salut Je viens avec un tout petit (un gros enfaite) probl=C3=A8me  qu=
i me sauf un peu le cerveau. bon voila! j'essaie de faire un Callback avec =
un Bouton mais le souci c'est que ce bon vieux Gnat me dit ceci ( pour info=
 je suis carr=C3=A9ment nul en anglais=F0=9F=98=8A=F0=9F=98=9B) :
  Instantiation error at gtk-handlers.ads : 1039
Subprogram must not be deeper than access type.

plus loin Gnat dit encore ceci :
 No candidate interpretations match the actuals:
expected type "handler" defined at gtk-marshaller.ads :395, instance at gtk=
-handlers :918 , instance at line 10.
Found type access to procedure "Stop_Program" defined at line 38.
=3D> in call to "to_marshaller" at gtk-handlers.ads :959, ainstance at line=
 10
=3D> in call to "to_marshaller" at gtk-handlers.ads :954, ainstance at line=
 10
=3D> in call to "to_marshaller" at gtk-handlers.ads :949, ainstance at line=
 10
=3D> in call to "to_marshaller" at gtk-handlers.ads :944, ainstance at line=
 10
=3D> in call to "to_marshaller" at gtk-handlers.ads :939, ainstance at line=
 10
=3D> in call to "to_marshaller" at gtk-handlers.ads :935, ainstance at line=
 10
=3D> in call to "to_marshaller" at gtk-handlers.ads :931, ainstance at line=
 10
=3D> in call to "to_marshaller" at gtk-handlers.ads :927, ainstance at line=
 10
=3D> in call to "to_marshaller" at gtk-handlers.ads :923, ainstance at line=
 10

voici mon code :=20

WITH Gtk.Main;             USE Gtk.Main;
WITH Gtk.Widget;         USE Gtk.Widget;
WITH Gtk.Window;        USE Gtk.Window;
WITH Gtk.Enums;          USE Gtk.Enums;
WITH Gtk.Button;           USE Gtk.Button;
WITH Gtk.Handlers;

Procedure Test is

Package P_Callback is new Gtk.Handlers.Callback (Gtk_Widget_Record);
USE P_Callback;

Procedure Stop_Program ( Emetteur : Gtk_Widget_Record'Class ) is
Pragma Unreferenced (Emetteur);
begin
Main_Quit;

end Stop_Program;

Win : Gtk_Window;
Bouton : Gtk_Button;

begin
Init;

Gtk_New (Win);
Win.Set_Default_Size (600,400);

Gtk_New (Bouton,"Le Bouton");


Win.Add (Bouton);

P_Callback.Connect (Bouton,"Clicked", To_marshaller (Stop_Program'Access));

Win.Show_All;
Main;
end Test;

Voila pour vous dire vrai je ne vois aucun probleme donc si quelqu'un pouva=
it m'expliquer ce qui cloche j'en serai vraiment ravi.

pour info je suis sur Windows10 et j'utilise la version Gnat 2020.