GTK g_idle_add

[António Pinho <shinigami godspeed gmail com>]

I am making an application for identifying a person. It opens a window and displays information. There is an authentication process that will be running in the background of the window. As so i would like to show each different state of the autentication in the "status_label" and in my code i am trying to test that using the label_event function. This is giving me error because of the "   g_idle_add(label_event,G_OBJECT(status_label));" . Am i doing this in the correct way? Thank you

Code : 

  GtkWidget *window;
  GtkWidget *button;
  GtkWidget *vbox;
  GtkWidget *hbox;
  GtkWidget *hbox2;
  GtkWidget *hbox3;
  GtkWidget *halign;
  GtkWidget *valign;
  GtkWidget *status_label;
  GtkWidget *table;
  GtkWidget *status_frame;
  GtkWidget *id_frame;
  GtkWidget *image1;
  GtkWidget *alignment1;



/* another callback */
static gboolean delete_event( GtkWidget *widget, GdkEvent  *event,  gpointer   data )
{
    gtk_main_quit ();
    return FALSE;
}


static gboolean label_event( gpointer widget)
{
 int x =1;
  


 do
 {
  write_label("Uploading information.\n",widget);
  usleep(100);
  clear_label(widget);
  write_label("Uploading information..\n",widget);
  usleep(100);
  clear_label(widget);
  write_label("Uploading information...\n",widget);
  usleep(100);
  clear_label(widget);
  x++ ;
 }
 while (x!=3);


 write_label("Uploading info done!\n",widget);
 
}

void clear_label(GtkWidget *label)
{
 gtk_label_set_text(GTK_LABEL(label)," ");
}

void write_label(const char * message, GtkWidget *label)
{
 
  char * newmessage = (char *)calloc(strlen(gtk_label_get_text(GTK_LABEL(label) )) + strlen(message) + 1,   sizeof(char));

  strcat(newmessage,gtk_label_get_text( GTK_LABEL(label)));

  strcat(newmessage,message);

  gtk_label_set_text(GTK_LABEL(label),newmessage);
}

GdkPixbuf *create_pixbuf(const gchar * filename)
{
   GdkPixbuf *pixbuf;
   GError *error = NULL;
   pixbuf = gdk_pixbuf_new_from_file(filename, &error);
   if(!pixbuf) {
      fprintf(stderr, "%s\n", error->message);
      g_error_free(error);
   }

   return pixbuf;
}


void init( int   argc,  char *argv[] )
{
    /* GtkWidget is the storage type for widgets */
  
    /* This is called in all GTK applications. Arguments are parsed
     * from the command line and are returned to the application. */
    gtk_init (&argc, &argv);

    /* Create a new window */
    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

    /* This is a new call, which just sets the title of our Window */
    gtk_window_set_title (GTK_WINDOW (window), "Autenticação");
    gtk_window_set_default_size(GTK_WINDOW(window), 450, 300);
    gtk_container_set_border_width(GTK_CONTAINER(window), 10);
    gtk_window_set_icon(GTK_WINDOW(window), create_pixbuf("icon.png"));    

  /* Here we just set a handler for delete_event that immediately
     * exits GTK. */
    g_signal_connect (G_OBJECT (window), "delete_event",
              G_CALLBACK (delete_event), NULL);

   g_idle_add(label_event,G_OBJECT(status_label));


    table=gtk_table_new(4,1,FALSE);

    //gtk_table_set_row_spacing(GTK_TABLE(table), 1, 3);

  

    /* Creates a new button with the label "Button 1". */
    button = gtk_button_new_with_label ("Sair");
    
    /* Now when the button is clicked, we call the "callback" function
     * with a pointer to "button 1" as its argument */
    g_signal_connect (G_OBJECT (button), "clicked",
              G_CALLBACK (delete_event), NULL);

  
   vbox = gtk_vbox_new(FALSE, 5);

  valign = gtk_alignment_new(0, 1, 0, 0);
  gtk_container_add(GTK_CONTAINER(vbox), valign);

  hbox = gtk_hbox_new(TRUE, 3);

  gtk_widget_set_size_request(button, 70, 30);
  gtk_container_add(GTK_CONTAINER(hbox), button);

  halign = gtk_alignment_new(1, 0, 0, 0);
  gtk_container_add(GTK_CONTAINER(halign), hbox);

  gtk_box_pack_start(GTK_BOX(vbox), halign, FALSE, FALSE, 0);

  gtk_table_attach_defaults(GTK_TABLE(table),vbox,0,1,3,4);

 /* Create the status frame Frame */
  status_frame = gtk_frame_new (NULL);

 /* Set the status frame label */
  gtk_frame_set_label (GTK_FRAME (status_frame), "Estado da autenticação");

  /* Set the frame to the first row and first column */
 gtk_table_attach_defaults(GTK_TABLE(table),status_frame,0,1,0,1);

  hbox3 = gtk_hbox_new (FALSE, 0);
  gtk_container_add (GTK_CONTAINER (status_frame), hbox3);

   /* Create the label containing the text */
    status_label = gtk_label_new("");
  gtk_label_set_justify(GTK_LABEL(status_label),GTK_JUSTIFY_LEFT);

  gtk_box_pack_start(GTK_BOX(hbox3),status_label,FALSE,FALSE,0);


  
 id_frame=gtk_frame_new(NULL);


 gtk_table_attach_defaults(GTK_TABLE(table),id_frame,0,1,1,3);

 gtk_frame_set_label (GTK_FRAME (id_frame), "Identificação do utilizador");

 alignment1 = gtk_alignment_new (0.5, 0.5, 1, 1);
  gtk_widget_show (alignment1);
  gtk_container_add (GTK_CONTAINER (id_frame), alignment1);
  gtk_alignment_set_padding (GTK_ALIGNMENT (alignment1), 0, 0, 12, 0);

  hbox2 = gtk_hbox_new (FALSE, 0);
  gtk_container_add (GTK_CONTAINER (alignment1), hbox2);

  image1=gtk_image_new_from_file("petrelli.jpg");
  gtk_box_pack_end(GTK_BOX (hbox2), image1, FALSE, FALSE, 0);

  gtk_container_add(GTK_CONTAINER(window), table);

  gtk_widget_show_all(window);


  gtk_main();

}