auto connect signals

I'm new to glade programming. below is my first gtk+ snippet with glade.
hello.c:

#include <gtk/gtk.h>

static int count;
void on_button_quit_clicked (GtkWidget *button, gpointer userdata){
    //gtk_window_resize(window,(gint)100+count,(gint)100+count);
    //count = count + 1;
    gtk_main_quit();
}

int main (int argc, char **argv){
    GtkBuilder *builder;
    GtkWidget *window;
    GtkWidget *button;
    gtk_init (&argc, &argv);
    builder = gtk_builder_new();
    gtk_builder_add_from_file(builder, "hello.glade", NULL);
    gtk_builder_connect_signals(builder,(GtkBuilde,NULL);
    gtk_widget_show_all(window);
    gtk_main();
    return 0;
}

hello.glade:

<?xml version="2.0"?>
<interface>
  <requires lib="gtk+" version="2.16"/>
  <!-- interface-naming-policy project-wide -->
  <object class="GtkWindow" id="window1">
    <child>
      <object class="GtkVPaned" id="vpaned1">
        <property name="visible">True</property>
        <property name="can_focus">True</property>
        <property name="orientation">vertical</property>
        <child>
          <object class="GtkLabel" id="label1">
            <property name="visible">True</property>
            <property name="label" translatable="yes">label</property>
          </object>
          <packing>
            <property name="resize">False</property>
            <property name="shrink">True</property>
          </packing>
        </child>
        <child>
          <object class="GtkHBox" id="hbox1">
            <property name="visible">True</property>
            <child>
              <placeholder/>
            </child>
            <child>
              <object class="GtkHButtonBox" id="hbuttonbox1">
                <property name="visible">True</property>
                <child>
                  <object class="GtkButton" id="button_quit">
                    <property name="label"
translatable="yes">quit</property>
                    <property name="visible">True</property>
                    <property name="can_focus">True</property>
                    <property name="receives_default">True</property>
                    <signal name="clicked" handler="on_button_quit_clicked"
object="NULL"/>
                  </object>
                  <packing>
                    <property name="expand">False</property>
                    <property name="fill">False</property>
                    <property name="position">0</property>
                  </packing>
                </child>
                <child>
                  <object class="GtkButton" id="button2">
                    <property name="label"
translatable="yes">button</property>
                    <property name="visible">True</property>
                    <property name="can_focus">True</property>
                    <property name="receives_default">True</property>
                  </object>
                  <packing>
                    <property name="expand">False</property>
                    <property name="fill">False</property>
                    <property name="position">1</property>
                  </packing>
                </child>
              </object>
              <packing>
                <property name="position">1</property>
              </packing>
            </child>
            <child>
              <placeholder/>
            </child>
          </object>
          <packing>
            <property name="resize">True</property>
            <property name="shrink">True</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
</interface>


error message:

(hello:8403): Gtk-WARNING **: Could not lookup object NULL on signal clicked
of object button_quit

(hello:8403): Gtk-CRITICAL **: gtk_main_quit: assertion `main_loops != NULL'
failed
Segmentation fault


It seems NULL is cause of failure, but who can post a correct code to prove
my guess?

TIA

_______________________________________________
Glade-devel maillist  -  [email protected]
http://lists.ximian.com/mailman/listinfo/glade-devel