Re: Error output - completion with code

["Christian. Schleippmann" <Christian Schleippmann ncl ac uk>]

Hi again,
below is the part of my code. By the way, I have used parts of the tutorial
point 6 (gtk.org) "buttons.c" example programme. There happens the same
problem! So, if we find the bug, we can also improve the (already well done)
tutorial!

Cheers
Christian

one more comment:
The function "xpm_label_box(window, "info.xpm", "Grey RoI");" to initialise my
boxes is also from the tutorial.

Code:
int main( int   argc,
   char *argv[] )
{
  /* GtkWidget is the storage type for widgets */
  GtkWidget *window;
  GtkWidget *button1, *button2, *button3, *button4;
  GtkWidget *box1, *box2, *box3, *box4;
  GtkWidget *fixed;


  gtk_init (&argc, &argv);

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

  gtk_window_set_title (GTK_WINDOW (window), "Image processing");

  /* It's a good idea to do this for all windows. */
  gtk_signal_connect (GTK_OBJECT (window), "destroy",
        GTK_SIGNAL_FUNC (gtk_exit), NULL);

  gtk_signal_connect (GTK_OBJECT (window), "delete_event",
        GTK_SIGNAL_FUNC (gtk_exit), NULL);

  /* Sets the border width of the window. */
  gtk_container_set_border_width (GTK_CONTAINER (window), 80);
  gtk_widget_realize(window);

  /* Create new buttons */
  button1 = gtk_button_new ();
  button2 = gtk_button_new ();
  button3 = gtk_button_new ();
  button4 = gtk_button_new ();

  /* Connect the "clicked" signal of the button1 to our callback */
  gtk_signal_connect (GTK_OBJECT (button1), "clicked",
        GTK_SIGNAL_FUNC (call1), (gpointer) "Grey RoI");

  /* Connect the "clicked" signal of the button2 to our callback */
  gtk_signal_connect (GTK_OBJECT (button2), "clicked",
        GTK_SIGNAL_FUNC (call2), (gpointer) "Colour RoI");

  /* Connect the "clicked" signal of the button3 to our callback */
  gtk_signal_connect (GTK_OBJECT (button3), "clicked",
        GTK_SIGNAL_FUNC (call3), (gpointer) "Grey Mask");

  /* Connect the "clicked" signal of the button4 to our callback */
  gtk_signal_connect (GTK_OBJECT (button4), "clicked",
        GTK_SIGNAL_FUNC (call4), (gpointer) "Colour Mask");


  /* This calls our box creating function */
  box1 = xpm_label_box(window, "info.xpm", "Grey RoI");
  box2 = xpm_label_box(window, "info.xpm", "Colour RoI");
  box3 = xpm_label_box(window, "info.xpm", "Grey Mask");
  box4 = xpm_label_box(window, "info.xpm", "Golour Mask");

  /* Pack and show all our widgets */
  gtk_widget_show(box1);
  gtk_widget_show(box2);
  gtk_widget_show(box3);
  gtk_widget_show(box4);

  gtk_container_add (GTK_CONTAINER (button1), box1);
  gtk_container_add (GTK_CONTAINER (button2), box2);
  gtk_container_add (GTK_CONTAINER (button3), box3);
  gtk_container_add (GTK_CONTAINER (button4), box4);

  gtk_widget_show(button1);
  gtk_widget_show(button2);
  gtk_widget_show(button3);
  gtk_widget_show(button4);

  fixed = gtk_fixed_new();
  gtk_container_add(GTK_CONTAINER(window), fixed);
  gtk_widget_show(fixed);

  /* position of buttons in window container */
  gtk_fixed_put (GTK_FIXED (fixed), button1, 50, 50);
  gtk_fixed_put (GTK_FIXED (fixed), button2, 50, 100);
  gtk_fixed_put (GTK_FIXED (fixed), button3, 150, 50);
  gtk_fixed_put (GTK_FIXED (fixed), button4, 150, 100);

  gtk_widget_show (window);

  /* Rest in gtk_main and wait for the fun to begin! */
  gtk_main ();

  return(0);
}





> > I get several error outputs in the programme evoking shell from GTK+
> > (see below). There is so far no problem with the programme itself,
> > however, I would like to get rid of this outputs. How can I suppress
> > them?
>
>
> You're doing something with a yet uninitialized widget (widget != NULL).
> You should send parts of you code that could have to do with this for us to
> make sense out of this, I guess...
>
> check your code for gtk_widget_show(widget); commands where you didn't
> initialize the widget yet (i.e. widget = gtk_....._new(.....);)
>
> Ronald
>
> --
> ---------------------------------------------------.
> --   .-.    | Ronald Bultje                        |
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> --  ^^-^^   |    *** Warning: Unix Addicted ***    |
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