程序代码：

#include <gtk/gtk.h>

GdkPixbuf *creat_pixbuf(const gchar *file)
{
    GdkPixbuf *pixbuf;
    GError *error = NULL;
    pixbuf = gdk_pixbuf_new_from_file(file, &error);
    if (!pixbuf)
    {
        fprintf(stderr, "%s\n", error->message);
        g_error_free(error);
    }
    
    return pixbuf;
}

int main(int argc, char **argv)
{
    /*定义一个窗口指针*/
    GtkWidget *main_window;
    
    /*初始化*/
    gtk_init(&argc, &argv);
    
    /*创建一个窗口*/
    main_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    
    /*设置窗口标题*/
    gtk_window_set_title(GTK_WINDOW(main_window), "Yucoat!");
    
    /*设置窗口默认大小*/
    gtk_window_set_default_size(GTK_WINDOW(main_window), 280, 200);
    
    /*设置窗口所在位置*/
    gtk_window_set_position(GTK_WINDOW(main_window), GTK_WIN_POS_CENTER);
    
    /*设置窗口图标*/
    gtk_window_set_icon(GTK_WINDOW(main_window), creat_pixbuf("music.png"));
    
    g_signal_connect(main_window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
    /*显示窗口*/
    gtk_widget_show(main_window);

    gtk_main();

    return 0;
}