#include <gtk/gtk.h>static gboolean release_resource( GtkWidget *widget,                                   GdkEvent  *event,                                   gpointer   data ){        gtk_main_quit ();        return FALSE;}int main(int argc,char *argv[]){        GtkWidget *dialog;	GtkWidget *label;	GtkWidget *btn1;	GtkWidget *btn2;	        gtk_init (&argc, &argv);        	dialog= gtk_dialog_new();        gtk_window_set_title(GTK_WINDOW(dialog),"p19.1");	gtk_widget_set_size_request(dialog,200,200);		label=gtk_label_new("text sample");	gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox),label,TRUE,TRUE,0);	btn1=gtk_button_new_with_label("Ok");	gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->action_area),btn1,FALSE,FALSE,0);	btn2=gtk_button_new_with_label("Cancel");	gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->action_area),btn2,FALSE,FALSE,0);        g_signal_connect(G_OBJECT(dialog),"delete_event",G_CALLBACK(release_resource),NULL);        gtk_widget_show_all(dialog);        gtk_main();        return 0;}