/* * * 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 <gtk/gtk.h>typedef struct cdata {  GtkWidget *combo;  GList *cbitems;} CData;static voidGetComboEntry(GtkWidget *widget, CData *data){  char *val = (char *) NULL;  val = gtk_entry_get_text(GTK_ENTRY(GTK_COMBO(data->combo)->entry));  if ( val )    printf( "Value entered/selected is %s\n", val );}static voidAddComboEntry(GtkWidget *widget, CData *data){  char *buf, *val = (char *) NULL;  val = gtk_entry_get_text(GTK_ENTRY(GTK_COMBO(data->combo)->entry));  if ( val != (char *) NULL ) {    buf = (char *) malloc( strlen( val ) + 1 );    if ( buf != (char *) NULL ) {      strcpy( buf, val );      data->cbitems = g_list_append(data->cbitems, buf );      gtk_combo_set_popdown_strings(GTK_COMBO(data->combo),         data->cbitems);    }  }}main( int argc, char *argv[] ){	GtkWidget *dialog_window, *button;	CData data;  data.cbitems = NULL;  gtk_init( &argc, &argv );  dialog_window = gtk_dialog_new();  gtk_window_position (GTK_WINDOW (dialog_window), GTK_WIN_POS_MOUSE);  data.combo = gtk_combo_new();  data.cbitems = g_list_append(data.cbitems, "Joe's Pizza Shack" );  data.cbitems = g_list_append(data.cbitems, "Burgers And Stuff" );  data.cbitems = g_list_append(data.cbitems, "Vegetarian Delights" );  data.cbitems = g_list_append(data.cbitems, "El Taco Shop" );  gtk_combo_set_popdown_strings (GTK_COMBO (data.combo), data.cbitems);  gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog_window)->vbox),     data.combo, TRUE, TRUE, 0);  button = gtk_button_new_with_label ("Ok");  gtk_signal_connect (GTK_OBJECT (button), "clicked",    GTK_SIGNAL_FUNC(GetComboEntry), &data);  gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog_window)->action_area),    button, TRUE, TRUE, 0);  button = gtk_button_new_with_label ("Add");  gtk_signal_connect (GTK_OBJECT (button), "clicked",    GTK_SIGNAL_FUNC(AddComboEntry), &data);  gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog_window)->action_area),    button, TRUE, TRUE, 0);  gtk_widget_show_all (dialog_window);  gtk_main();}