problem to send a notification.

[eddie <mrcyberfighter gmail com>]

Hi everybody,

I have write the following code but their is no way to send a

notification even

if it's say that isn't guarantee that something will happen in the 
documentation

concerning notifications with gtk/gio.

```C

#include <gtk/gtk.h>
#include <stdlib.h>
#include <string.h>

#define DEBUG_FUNC_MARK  do { fprintf(stdout,"\n%s(...) called\n", 
__func__) ; } while(0) ;

/** GtkApplication example:
  *
  * To compile with:
  *
  * $ cc gtk_GtkApplication.c `pkg-config --cflags --libs gtk+-3.0`
  *
  *****************************************************************/
static void activate (GApplication *application, gpointer user_data) ;

static void startup(GApplication *application, gpointer user_data) ;

static void open_files(GApplication  *application, GFile **files, gint 
n_files, const gchar *hint) ;



static void about_activated(GSimpleAction *action, GVariant *parameter, 
gpointer app) ;

static void preferences_activated(GSimpleAction *action, GVariant 
*parameter, gpointer app) ;

static void quit_activated(GSimpleAction *action, GVariant *parameter, 
gpointer       app) ;

static void shutdown_app(GApplication *application, gpointer user_data) ;



void destroy(GtkWidget *widget, gpointer pointer) ;

static gboolean delete_event(GtkWidget *widget,GdkEvent *event,gpointer 
pointer) ;

GtkApplication *app;

int main (int argc, char **argv) {

  int status;

  GtkWidget *window ;


  // Given the program a name to displaying to the user through: 
g_get_application_name().
  g_set_application_name("myapp") ;

  const char *app_id = "myapp.org" ;

  if ( ! g_application_id_is_valid(app_id) ) {

    fprintf(stderr, "Wrong app id\n") ;
    exit(EXIT_FAILURE) ;

  }


  // Setting the applications flags
  int app_flags = G_APPLICATION_HANDLES_OPEN ;

  app_flags |=  G_APPLICATION_NON_UNIQUE ;
  app_flags |=  G_APPLICATION_SEND_ENVIRONMENT ;


  app = gtk_application_new(app_id, (GApplicationFlags) app_flags) ;

  // The ::activate signal is emitted on the primary instance when an 
activation occurs. When g_application_activate() is called.
  g_signal_connect( G_APPLICATION(app),  "activate", 
G_CALLBACK(activate),   NULL) ;
  // The ::open signal is emitted on the primary instance when there 
are files to open.
  g_signal_connect( G_APPLICATION(app),  "open", 
G_CALLBACK(open_files), NULL) ;
  // The ::startup signal is emitted on the primary instance 
immediately after registration. When g_application_register() is called.
  g_signal_connect( G_APPLICATION(app),  "startup", 
G_CALLBACK(startup),    NULL) ;
  // The ::shutdown signal is emitted only on the registered primary 
instance immediately after the main loop terminates.
  g_signal_connect( G_APPLICATION(app),  "shutdown", 
G_CALLBACK(shutdown_app),    NULL) ;

  GError *err = NULL ;

  g_application_register(G_APPLICATION(app), NULL, &err) ;

  if (err != NULL) {

    fprintf(stderr,"Cannot register app: %s\n", err->message) ;
    exit(EXIT_FAILURE) ;

  }



  fprintf(stdout,"GtkApplication DBUS path: %s\n", 
g_application_get_dbus_object_path(G_APPLICATION(app)) ) ;

  GtkBuilder *builder;
  GMenuModel *app_menu ;

  static GActionEntry app_entries[] = {

    { "preferences",  preferences_activated,  NULL, NULL, NULL },
    { "about",        about_activated,        NULL, NULL, NULL },
    { "quit",         quit_activated,         NULL, NULL, NULL }

  };

  g_action_map_add_action_entries(G_ACTION_MAP(app), app_entries, 
G_N_ELEMENTS(app_entries), app);

  builder = gtk_builder_new_from_file("./GtkApplication/menus.ui");

  fprintf(stdout,"builder: %p\n", builder) ;

  app_menu = G_MENU_MODEL (gtk_builder_get_object (builder, "appmenu"));

  if (gtk_application_prefers_app_menu(app)) {

    gtk_application_set_app_menu(GTK_APPLICATION(app), app_menu);

  }

  g_object_unref (builder);


  //g_application_set_inactivity_timeout( G_APPLICATION(app), 10000) ;


  window = gtk_application_window_new(app)  ;

g_signal_connect(G_OBJECT(window),"destroy",G_CALLBACK(destroy),NULL) ;

g_signal_connect(G_OBJECT(window),"delete-event",G_CALLBACK(delete_event),NULL) 
;

  gtk_widget_show_all(window) ;




  g_application_set_default(g_application_get_default()) ;

  g_application_activate(G_APPLICATION(app)) ;

  status = g_application_run(G_APPLICATION(app), argc, argv) ;

  g_object_unref (app);

  return status;
}

static void activate(GApplication *application, gpointer user_data) {

  #ifdef DEBUG
  DEBUG_FUNC_MARK
  #endif

  g_application_hold(application) ;

  GNotification *notification = g_notification_new( 
g_get_application_name() ) ;

  g_notification_set_title(notification, "title") ;

  g_notification_set_default_action(notification, "app.actions") ;

  gchar *notification_body = g_strdup_printf("Test notification body\n") ;

  g_notification_set_body(notification, notification_body) ;

  g_notification_set_priority(notification, 
G_NOTIFICATION_PRIORITY_NORMAL) ;

  g_application_send_notification( G_APPLICATION(application), 
"notification", notification);

  g_application_release(application) ;

  /** @Note: when doing a longer-lasting action here that returns
   ** to the mainloop, you should use g_application_hold() and
   ** g_application_release() to keep the application alive until
   ** the action is completed.
   ** Only by not intern done things like file opening not by toplevel 
displaying .
********************************************************************************/
}

static void startup(GApplication *application, gpointer user_data) {
  //#ifdef DEBUG
  DEBUG_FUNC_MARK
  //#endif

  g_print ("startup\n");

  /** @Note: when doing a longer-lasting action here that returns
   ** to the mainloop, you should use g_application_hold() and
   ** g_application_release() to keep the application alive until
   ** the action is completed.
   ** Only by not intern done things like file opening not by toplevel 
displaying .
********************************************************************************/
}

static void open_files(GApplication  *application, GFile **files, gint 
n_files, const gchar *hint) {

  //#ifdef DEBUG
  DEBUG_FUNC_MARK
  //#endif

  gint i;

  for (i = 0; i < n_files; i++) {

    gchar *uri = g_file_get_uri (files[i]);
    g_print ("open %s\n", uri);

    g_free (uri);

  }

  /** @Note: when doing a longer-lasting action here that returns
   ** to the mainloop, you should use g_application_hold() and
   ** g_application_release() to keep the application alive until
   ** the action is completed.
   ** Only by not intern done things like file opening not by toplevel 
displaying .
********************************************************************************/
}

static void about_activated(GSimpleAction *action, GVariant *parameter, 
gpointer app) {

  //display_about_dialog(NULL, NULL) ;

  return ;

}

static void preferences_activated(GSimpleAction *action, GVariant 
*parameter, gpointer app) {

  //configure_program_dialog(NULL, NULL) ;

  return ;

}

static void quit_activated(GSimpleAction *action, GVariant *parameter, 
gpointer       app) {

  //#ifdef DEBUG
  DEBUG_FUNC_MARK
  //#endif

  destroy(NULL, NULL) ;

  return ;

}

static void shutdown_app(GApplication *application, gpointer user_data) {

  //#ifdef DEBUG
  DEBUG_FUNC_MARK
  //#endif

  fprintf(stdout,"application shutdown\n") ;

  destroy(NULL, NULL) ;

  return ;

}

void destroy(GtkWidget *widget, gpointer pointer) {

  //#ifdef DEBUG
  DEBUG_FUNC_MARK
  //#endif

  exit(EXIT_SUCCESS) ;

}

static gboolean delete_event(GtkWidget *widget,GdkEvent *event,gpointer 
pointer) {

  #ifdef DEBUG
  DEBUG_FUNC_MARK
  #endif

  if (event->type == GDK_DELETE) {


    #ifdef DEBUG
    fprintf(stdout,"%s delete_event catch\n",     __func__) ;
    #endif

    return FALSE ;
  }
  else {

    #ifdef DEBUG
    fprintf(stdout,"%s delete_event not catch\n", __func__) ;
    #endif

    return FALSE ;
  }
}

```

I work on a Ubuntu-Gnome system 16.10.

I don't understand why my application doesn't send any notification.

Is it a DBus problem or some other kind of underlying problem.


Thanks for your answers,

best regards,

mrcyberfighter.


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