Re: segmentation fault

[Olexiy Avramchenko <olexiy ctech cn ua>]

Aaron Yang wrote:
> > void draw_button_clicked ( void )
> {
1. You're passing NULL as a parameter for timeout's callback.
>   g_timeout_add (100, real_draw, NULL);
> }
2. window parameter is NULL (see above).
> static gint real_draw ( gpointer window )
> {
>   GtkWidget *widget;
3. Variable widget is undefined, it can hold any pointer.
>   static int i=0;
4. Here you're passing undefined variable to the draw_brush call.
>   draw_brush (widget, x[i], y[i]);
>   i++;
>   return TRUE;
> }

Compile your program with -Wall gcc option and fix all warnings from 
compiler.

To solve your problem you should do smth like this:

void draw_button_clicked ( GtkWidget *button, GtkWidget *drawing_area )
{
  g_timeout_add (100, real_draw, drawing_area);
}

static gint real_draw ( GtkWidget *drawing_area )
{
  static int i=0;

  draw_brush (widget, x[i], y[i]);
  i++;
  return TRUE;
}

Somewhere in code:
  g_signal_connect (button, "clicked", G_CALLBACK(draw_button_clicked), 
drawing_area);

        Olexiy