/* * * Sample Code for Gtk+ Programming in C, 1st Edition, Prentice Hall * * Copyright 2000 - 2002 Syd Logan, All Rights Reserved * * This code is distributed without warranty. You are free to use this * code for any purpose, however, if this code is republished or * redistributed in its original form, as hardcopy or electronically, * then you must include this copyright notice along with the code. * * Questions or comments regarding this code or any bugs it contains can * be directed to the author via e-mail at slogan@cts.com **/#include <stdio.h>#include <gtk/gtk.h>static GtkWidget *entry;voidPrintAndExit (GtkWidget *widget, GtkWidget *window){  char	*str;  str = gtk_entry_get_text( GTK_ENTRY(entry) );  if ( str != (char *) NULL )    printf( "%s\n", str );  gtk_widget_destroy (window);  gtk_main_quit ();}voidPrintByeAndExit (GtkWidget *widget, gpointer data){  printf( "Goodbye, world!\n" );  gtk_exit(0);}intmain( int argc, char *argv[] ){  GtkWidget *window, *label, *vbox, *hbox, *button, *separator;  gtk_set_locale ();  gtk_init (&argc, &argv);	window = gtk_window_new (GTK_WINDOW_TOPLEVEL);	gtk_window_set_policy( GTK_WINDOW( window ), FALSE, FALSE, FALSE );  gtk_signal_connect (GTK_OBJECT(window), "destroy",     GTK_SIGNAL_FUNC(PrintByeAndExit), NULL);  gtk_window_set_title (GTK_WINDOW (window), "Hello Gtk+!");  gtk_container_border_width (GTK_CONTAINER (window), 0); 	vbox = gtk_vbox_new (FALSE, 0); 	gtk_container_add (GTK_CONTAINER (window), vbox); 	hbox = gtk_hbox_new (FALSE, 0); 	gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);	label = gtk_label_new( "Enter a message:" ); 	gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0); 	entry = gtk_entry_new (); 	gtk_entry_set_text (GTK_ENTRY (entry), ""); 	gtk_editable_select_region (GTK_EDITABLE (entry), 0, -1); 	gtk_box_pack_start (GTK_BOX (hbox), entry, FALSE, FALSE, 0); 	separator = gtk_hseparator_new (); 	gtk_box_pack_start (GTK_BOX (vbox), separator, FALSE, FALSE, 0); 	button = gtk_button_new_with_label ("Print"); 	gtk_signal_connect_object (GTK_OBJECT (button), "clicked", 	  GTK_SIGNAL_FUNC(PrintAndExit), GTK_OBJECT (window)); 	gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0); 	GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT); 	gtk_widget_grab_default (button);	gtk_widget_show_all (window);	gtk_main ();	return( 0 );}