Opening a file dialog with gtk

gtk_file_dialog.c

#include <gtk/gtk.h>

static gboolean 
menu_close_program(GtkWidget *widget,
                   GdkEvent *event,
                   gpointer data)
{
    gtk_main_quit();

    return TRUE;
}

static void
button_press_cb(GtkWidget *src,
                gpointer *data)
{
    GtkWidget *file_dlg = gtk_file_chooser_dialog_new("Select file",
                                                      NULL,
                                                      GTK_FILE_CHOOSER_ACTION_OPEN,
                                                      GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
                                                      GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
                                                      NULL);
        
    if( gtk_dialog_run(GTK_DIALOG(file_dlg)) == GTK_RESPONSE_ACCEPT )
    {
        char *filename;
        filename = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (file_dlg));
        printf("selected file %s\n", filename);
        g_free (filename);
    }
    gtk_widget_destroy(file_dlg);
}

int
main(int argc, char *argv[])
{
    GtkWidget *main_window;
    GtkWidget *sizer_main;
    GtkWidget *button;

    gtk_init(&argc, &argv);

    main_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(main_window), "test");
    g_signal_connect_swapped(main_window, "delete-event",
                             G_CALLBACK(menu_close_program),
                             main_window);

    button = gtk_button_new_with_label("press me");
    g_signal_connect(button, "clicked",
                     G_CALLBACK(button_press_cb),
                     NULL);

    sizer_main = gtk_vbox_new(TRUE, 5);
    gtk_box_pack_start(GTK_BOX(sizer_main), button, FALSE, FALSE, 0);
    gtk_container_add(GTK_CONTAINER(main_window), sizer_main);

    gtk_widget_show_all(main_window);

    gtk_main();

    return 0;
}