On Thu, Jun 29, 2006 at 07:49:43PM +1000, kadil wrote:
> I used glade to "build" some a simple app. Why does my
> on_button1_clicked callback segfault. The very same function call works
> in the expose event.
Nothing in on_drawingarea1_expose_event() uses the
global variable drawingarea1, so they are not quite the
same. It's probably uninitialized when on_button1_clicked()
is called (note global variables are generally frowned upon,
you can easily attach the pixmap to the drawing area with
g_object_set_data() and also pass the drawing area as the
callback data of on_button1_clicked() completely eliminating
global variables).
Did you try to use a debugger before mailing to the list?
Or valgrind? What did you find? If the cause really is
uninitialized drawingarea1, you would find it very easily
yourself.
>
> #ifdef HAVE_CONFIG_H
> # include <config.h>
> #endif
>
> #include <gtk/gtk.h>
>
> #include "callbacks.h"
> #include "interface.h"
> #include "support.h"
> static GdkPixmap *pixmap = NULL;
> GtkWidget *drawingarea1;
>
> void
> on_button1_clicked (GtkButton *button,
> gpointer user_data)
> {
>
> gdk_draw_rectangle(pixmap, drawingarea1->style->black_gc,TRUE,50,
> 50,99, 88);
>
> }
>
> gboolean
> on_drawingarea1_expose_event (GtkWidget *widget,
> GdkEventExpose *event,
> gpointer user_data)
> {
> gdk_draw_drawable(widget->window, widget->style->fg_gc[GTK_WIDGET_STATE
> (widget)], pixmap, event->area.x, event->area.y, event->area.x,
> event->area.y, event->area.width, event->area.height);
> return FALSE;
> }
Yeti
--
Anonyms eat their boogers.
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