gtk edit

#include <stdio.h>#include <stdlib.h>#include <gtk/gtk.h>static void enter_callback( GtkWidget *widget,                            GtkWidget *entry ){  const gchar *entry_text;  entry_text = gtk_entry_get_text (GTK_ENTRY (entry));  printf ("Entry contents: %s\n", entry_text);}int main( int   argc,          char *argv[] ){    GtkWidget *window;    GtkWidget *vbox, *hbox;    GtkWidget *entry;    GtkWidget *button;    gtk_init (&argc, &argv);    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);    gtk_widget_set_size_request (GTK_WIDGET (window), 200, 100);    gtk_window_set_title (GTK_WINDOW (window), "GTK Entry");    g_signal_connect (G_OBJECT (window), "destroy",                      G_CALLBACK (gtk_main_quit), NULL);    g_signal_connect_swapped (G_OBJECT (window), "delete_event",                              G_CALLBACK (gtk_widget_destroy),                               G_OBJECT (window));    vbox = gtk_vbox_new (FALSE, 0);    gtk_container_add (GTK_CONTAINER (window), vbox);    gtk_widget_show (vbox);    entry = gtk_entry_new ();    gtk_entry_set_max_length (GTK_ENTRY (entry), 50);    g_signal_connect (G_OBJECT (entry), "activate",		      G_CALLBACK (enter_callback),		      (gpointer) entry);    gtk_entry_set_text (GTK_ENTRY (entry), "hello, world!");    gtk_box_pack_start (GTK_BOX (vbox), entry, TRUE, TRUE, 0);    gtk_widget_show (entry);    hbox = gtk_hbox_new (FALSE, 0);    gtk_container_add (GTK_CONTAINER (vbox), hbox);    gtk_widget_show (hbox);                                                                          button = gtk_button_new_from_stock (GTK_STOCK_CLOSE);    g_signal_connect_swapped (G_OBJECT (button), "clicked",			      G_CALLBACK (enter_callback),			      G_OBJECT (entry));    gtk_box_pack_start (GTK_BOX (vbox), button, TRUE, TRUE, 0);    GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);    gtk_widget_grab_default (button);    gtk_widget_show (button);        gtk_widget_show (window);    gtk_main();    return 0;}