C - 使用gtk3创建菜单

Question

我正在尝试在gtk3中创建一个简单的菜单。我正在查看我在网络上找到的官方文档和其他代码，但我仍然无法让它工作。菜单没有出现。

我将不胜感激任何帮助。谢谢。

这是我到目前为止的代码：

#include <stdio.h>
#include <gtk/gtk.h>
//#include "minefield.h"

enum difficulty {BEGINNER, ADVANCED, EXPERT};

static void activate(GtkApplication* app, gpointer user_data);
GdkPixbuf *create_pixbuf(const gchar * filename);

void newGame();
void openSetupDialog();
void openOptionDialog();

int main(int argc, char *argv[]) {
    GtkApplication *app;
    int status;

    app = gtk_application_new("my.ne.sweeper", G_APPLICATION_FLAGS_NONE);
    g_signal_connect(app, "activate", G_CALLBACK (activate), NULL);
    status = g_application_run(G_APPLICATION (app), argc, argv);
    g_object_unref(app);

    return status;
}

static void activate(GtkApplication* app, gpointer user_data) {
    GdkPixbuf *app_icon;
    GtkWidget *app_window;
    GtkWidget *app_box;
    GtkWidget *menubar;
    GtkWidget *gameMenu;
    GtkWidget *gameMenu_game;
    GtkWidget *gameMenu_newGame;
    GtkWidget *gameMenu_setup;
    GtkWidget *gameMenu_options;
    GtkWidget *gameMenu_quit;
    GtkWidget *sep;

    // App_window
    app_window = gtk_application_window_new(app);
    gtk_window_set_title(GTK_WINDOW(app_window), "Minesweeper");
    gtk_window_set_default_size(GTK_WINDOW(app_window), 600, 400);
    gtk_window_set_position(GTK_WINDOW(app_window), GTK_WIN_POS_CENTER);
    // App_box
    app_box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
    gtk_container_add(GTK_CONTAINER(app_window), app_box);
    // App_icon
    app_icon = create_pixbuf("../img/app_icon.svg");
    gtk_window_set_icon(GTK_WINDOW(app_window), app_icon);

    // Menubar
    menubar = gtk_menu_bar_new();
    gtk_box_pack_start(GTK_BOX(app_box), menubar, FALSE, FALSE, 0);
    // Start menu
    gameMenu = gtk_menu_new();
    gameMenu_game = gtk_menu_item_new_with_label("Game");
    gameMenu_newGame = gtk_menu_item_new_with_label("New Game");
    gameMenu_setup = gtk_menu_item_new_with_label("Setup");
    gameMenu_options = gtk_menu_item_new_with_label("Options");
    gameMenu_quit = gtk_menu_item_new_with_label("Quit");
    sep = gtk_separator_menu_item_new();

    gtk_menu_item_set_submenu(GTK_MENU_ITEM(gameMenu_game), gameMenu);
    gtk_menu_shell_append(GTK_MENU_SHELL(menubar), gameMenu_game);
    gtk_menu_shell_append(GTK_MENU_SHELL(gameMenu), gameMenu_newGame);
    gtk_menu_shell_append(GTK_MENU_SHELL(gameMenu), gameMenu_setup);
    gtk_menu_shell_append(GTK_MENU_SHELL(gameMenu), gameMenu_options);
    gtk_menu_shell_append(GTK_MENU_SHELL(gameMenu), sep);
    gtk_menu_shell_append(GTK_MENU_SHELL(gameMenu), gameMenu_quit);

    gtk_widget_show_all(app_window);

    // Signalhandlers
    g_signal_connect(app_window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
    g_signal_connect(gameMenu_newGame, "activate", G_CALLBACK(newGame), NULL);
    g_signal_connect(gameMenu_setup, "activate", G_CALLBACK(openSetupDialog), NULL);
    g_signal_connect(gameMenu_options, "activate", G_CALLBACK(openOptionDialog), NULL);
    g_signal_connect(gameMenu_quit, "activate", G_CALLBACK(gtk_main_quit), NULL);

    g_object_unref(app_icon);
}

GdkPixbuf *create_pixbuf(const gchar * filename) {

    GdkPixbuf *pixbuf;
    GError *error = NULL;
    pixbuf = gdk_pixbuf_new_from_file(filename, &error);

    if (!pixbuf) {
        fprintf(stderr, "[!] %s\n", error->message);
        g_error_free(error);
    }

    return pixbuf;
}

void newGame() {
    fprintf(stdout, "[*] %s\n", "new game..");
}

void openSetupDialog() {
    fprintf(stdout, "[*] %s\n", "open setup..");
}

void openOptionDialog() {
    fprintf(stdout, "[*] %s\n", "open options..");
}