GTK+ tutorial 4

//http://www.youtube.com/user/thecplusplusguy
//Thanks for the typed in code to Tapit85
#include <gtk/gtk.h>

static void button_clicked(GtkWidget* widget, gpointer data)
{
    gtk_label_set_text(GTK_LABEL(data), "you clicked the button");
}

int main(int argc, char* argv[])
{
    gtk_init(&argc, &argv);
    GtkWidget *window, *label, *button, *vbox;
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    g_signal_connect(window, "delete-event", G_CALLBACK(gtk_main_quit), NULL);

    label = gtk_label_new("Hello World");
    button = gtk_button_new_with_label("Click me");
    g_signal_connect(button, "clicked", G_CALLBACK(button_clicked), (gpointer)label);
    vbox = gtk_vbox_new(0, 0);
    gtk_box_pack_start(GTK_BOX(vbox), label, 1, 1, 0);
    gtk_box_pack_start(GTK_BOX(vbox), button, 1, 1, 0);
    gtk_container_add(GTK_CONTAINER(window), vbox);
    gtk_widget_show_all(window);
    gtk_main();
    return 0;
}