Re: segmentation fault

[Aaron Yang <porsche1904 yahoo com>]

hi, thanks for replying

after changing, segmentation fault still follows.

there's an additional error saying
warning: passing arg 2 of `g_timeout_add' from
incompatible pointer type

in this case arg 2 is static gint real_draw (
GtkWidget * )

i figure the error occurred because it shd be

static gint real_draw ( gpointer )

but still upon clicking the button,
program terminates with segmentation error. what else
could be the problem? thanks again for your help


--- Olexiy Avramchenko <olexiy ctech cn ua> wrote:

> 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



                
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