Hi,
I got from GDB this error for my application:
Program received signal SIGSEGV, Segmentation fault.
0x0804b349 in expose_event (widget=0x80ac738, event=0x0, g=0x0)
at graph_edit.c:248
248 gdk_draw_drawable (widget->window,
(gdb)
In this app, there are 2 timelines for graphic application
(ripped and modified from Eric Harlow source code chapter12/sysmon).
I have defined:
typedef struct {
GdkDrawable *pixmap;
GdkGC *gc;
} typGraphics;
extern GtkWidget *timeline_area1;
extern GtkWidget *timeline_area2;
static typGraphics *g1;
static typGraphics *g2;
.......
.......
/* --- Create the drawing area --- */
timeline_area1 = gtk_drawing_area_new ();
timeline_area2 = gtk_drawing_area_new ();
/* --- Size --- */
gtk_drawing_area_size (GTK_DRAWING_AREA (timeline_area1), 200, 200);
gtk_drawing_area_size (GTK_DRAWING_AREA (timeline_area2), 200, 200);
/* --- Make it visible --- */
gtk_widget_show (timeline_area1);
gtk_widget_show (timeline_area2);
/* --- We need the expose_event and the configure_event --- */
gtk_signal_connect (GTK_OBJECT (timeline_area1), "expose_event",
(GtkSignalFunc) expose_event, g1);
gtk_signal_connect (GTK_OBJECT(timeline_area1),"configure_event",
(GtkSignalFunc) configure_event, (gpointer) g1);
gtk_signal_connect (GTK_OBJECT (timeline_area2), "expose_event",
(GtkSignalFunc) expose_event, g2);
gtk_signal_connect (GTK_OBJECT(timeline_area2),"configure_event",
(GtkSignalFunc) configure_event, (gpointer) g2);
and for "configure_event":
static gint expose_event (GtkWidget *widget, GdkEventExpose *event, typGraphics
*g)
{
/* --- Copy it right over. --- */
gdk_draw_drawable (widget->window,
widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
g->pixmap,
event->area.x, event->area.y,
event->area.x, event->area.y,
event->area.width, event->area.height);
return FALSE;
}
Maybe problem is for 'typGraphics *g' in expose_Event(..) but for generic
'gpointer g' I have not solution...
Thanks in advance
France
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