message dialog box/signal question

[Casey Creighton <lost 7pks net>]

I can't seem to figure out what selection the user chose when presented with a 
message dialog box, here is the code creating the widget.

GtkWidget *dialog = gtk_message_dialog_new (GTK_WINDOW(window),
                GTK_DIALOG_DESTROY_WITH_PARENT,
                GTK_MESSAGE_QUESTION,
                GTK_BUTTONS_YES_NO,
                "Current message changed, would you like to save it?");
g_signal_connect(GTK_OBJECT (dialog), "response",
                         G_CALLBACK (saveCallback), ???);                               
gtk_dialog_run (GTK_DIALOG (dialog));
gtk_widget_destroy (dialog);

as you can see there is the ??? as the 4th param for g_signal_connect(), i 
don't know what to pass there, or how to get the data.

thanks in advance for the help.