How do I set the size of a widget/window? How do I prevent the user resizing my window? [GTK 2.x]

The gtk_widget_set_size_request() function is used to set the size of a widget to a specific size. The function gtk_window_set_resizable() function sets whether the user can resize a window, which they can by default. The definition of these functions are:

void gtk_widget_set_size_request (GtkWidget *widget,
                                  gint       width,
                                  gint       height);

void gtk_window_set_resizable (GtkWindow *window,
                               gboolean   resizable);