代码：

#include <gtk-2.0/gtk/gtk.h>
#include <gtk-2.0/gdk/gdkkeysyms.h>
#include <glib-2.0/glib.h>
#include <stdio.h>gint delete_event(GtkWidget *window, GdkEvent *event, gpointer data)
{gtk_widget_hide(window);return TRUE;
}void window2_sh(GtkWidget *button, GtkWidget *window)
{gboolean visibel;g_object_get(window, "visible", &visibel, NULL);if(visibel)gtk_widget_hide (window);elsegtk_widget_show (window);
}void window2_show(GtkWidget *window, GtkLabel *label)
{gtk_label_set_label(label, "子窗体显示");
}
void window2_hide(GtkWidget *window, GtkLabel *label)
{gtk_label_set_label(label, "子窗体隐藏");
}int main(int argc, char *argv[]) {gtk_init(&argc, &argv);GtkWidget *window;window = gtk_window_new(GTK_WINDOW_TOPLEVEL);gtk_window_set_title(GTK_WINDOW(window), "show/hide信号演示");gtk_widget_show(window);g_signal_connect(G_OBJECT(window), "delete-event",G_CALLBACK(gtk_main_quit), NULL);GtkWidget *window2;window2 = gtk_window_new(GTK_WINDOW_TOPLEVEL);gtk_window_set_title(GTK_WINDOW(window2), "子窗体");g_signal_connect(G_OBJECT(window2), "delete-event",G_CALLBACK(delete_event), NULL);GtkWidget *vbox;vbox = gtk_vbox_new(FALSE, 0);gtk_widget_show (vbox);gtk_container_add (GTK_CONTAINER (window), vbox);GtkWidget *label;label = gtk_label_new("");gtk_widget_show(label);gtk_box_pack_start (GTK_BOX (vbox), label, TRUE, TRUE, 0);GtkWidget *button;button = gtk_button_new_with_label ("显示/隐藏子窗体");gtk_widget_show (button);gtk_box_pack_start (GTK_BOX (vbox), button, TRUE, TRUE, 0);g_signal_connect(G_OBJECT(button), "clicked",G_CALLBACK(window2_sh), (gpointer) window2);g_signal_connect(G_OBJECT(window2), "show",G_CALLBACK(window2_show), (gpointer) label);g_signal_connect(G_OBJECT(window2), "hide",G_CALLBACK(window2_hide), (gpointer) label);gtk_main();return 0;
}

编译运行