Re: Compile warning (newbie)

["William D. Tallman" <wtallman olypen com>]

On Mon, Apr 16, 2007 at 05:01:29PM -0600, Michael L Torrie wrote:
> On Tue, 2007-04-17 at 08:22 +1000, Andrew Cowie wrote:
> > Return type of gtk_entry_get_text() is (const gchar*), not just
> > (gchar*). You discarded the const qualifier when assigning the result to
> > str.
> > 
> > Just declare str with const.
> 
> The reason why this is important is because gtk_entry_get_text is
> returning you just a pointer to a buffer inside the widget.  Therefore
> you should never modify it.  If you do, you run the risk of crashing the
> program.  That's why the return type is const and the compiler gives you
> a warning.
> 
> If you want to do something to the string you need to copy it with
> g_strdup, remembering to free your copy when you are done.
> 
> Michael

Then it should be like this?

void edit_changed (GtkWidget *widget, gpointer *data)
{
    const gchar *str;
    gchar *strcopy;

    str = gtk_entry_get_text (GTK_ENTRY (widget));
    
    strcopy = g_strdup(str);

    g_print ("Entry changed to %s\n", strcopy);

    free(strcopy);
}

I'm no whiz with C itself and have never used strdup.  IIUC, the
template is as above, replacing the g_print with whatever is to be done
with the copied string.  Is that correct?  If not, what don't I
understand here?

Thanks,

Bill Tallman