signal/slot question

[Robert Wilhelm <robert physiol med tu-muenchen de>]

Doing a gtk_signal_connect(), the data (last argument) does not reach
the callback function.

What I am doing wrong here?

Robert

#include <gtk/gtk.h>

static void  cb(GtkWidget* widget, gpointer data)
{
  printf("cb %p %p %p\n",widget,data, *(void **) data);
}
int main (int argc, char *argv[])
{
  GtkWidget *window;

  gtk_init (&argc, &argv);
  
  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

  gtk_widget_set_events(window,  GDK_BUTTON_PRESS_MASK| GDK_BUTTON_RELEASE_MASK );

  gtk_signal_connect(GTK_OBJECT(window),"button_press_event",GTK_SIGNAL_FUNC(cb),window);
  gtk_signal_connect(GTK_OBJECT(window),"button_release_event",GTK_SIGNAL_FUNC(cb),NULL);

  gtk_widget_show(window);

  gtk_main ();
           
  return 0;
}

$./a.out
cb 0x8065620 0x806d090 0x4
cb 0x8065620 0x806d090 0x7
cb 0x8065620 0x806d090 0x4
cb 0x8065620 0x806d090 0x7
cb 0x8065620 0x806d090 0x4
cb 0x8065620 0x806d090 0x7
cb 0x8065620 0x806d090 0x4
cb 0x8065620 0x806d090 0x7