调用rtgui_view_destroy为什么会assert failed

发布于 2010-12-23 20:51:56 浏览：4017 订阅该版

....
rtgui_view_t* sub_view = RT_NULL;
extern rtgui_view_t* main_view(rtgui_workbench_t* workbench);
// 返回按钮事件
void back_btn_onbutton(rtgui_widget_t* widget, struct rtgui_event* event)
{
    rtgui_workbench_t* workbench;
    workbench = RTGUI_WORKBENCH(RTGUI_WIDGET(sub_view)->parent);
    main_view(workbench);
    if(sub_view != RT_NULL)
    {
        rtgui_view_destroy(sub_view);
        sub_view = RT_NULL;
    }
}
.......

运行时,finsh提示信息：
(mem->used) assert failed at rt_free:498
查看mem.c中第498行,是代码:
RT_ASSERT(mem->used);

4 个回答

bernard 2010-12-24

这家伙很懒，什么也没写！

应该是重复释放内存了吧，你检查下你的代码，是否有重复释放控件、视图等的操作。

jerry619 2010-12-24

这家伙很懒，什么也没写！

检查了代码,没有发现重复释放view的地方.
为了进一步确认,我增加了调试输出:


rtgui_view_t* rtgui_view_create(const char* title)
{
    struct rtgui_view* view;
    /* allocate view */
    view = (struct rtgui_view*) rtgui_widget_create (RTGUI_VIEW_TYPE);
    if (view != RT_NULL)
    {
        if (title != RT_NULL)
            view->title = rt_strdup(title);
    }
rt_kprintf("---[+]----rtgui_view_create: %s
", title);  // for debug
    return view;
}
void rtgui_view_destroy(rtgui_view_t* view)
{
rt_kprintf("---[-]----rtgui_view_destroy: %s
", view->title);  // for debug
    if (view->modal_show == RT_TRUE)
        rtgui_view_end_modal(view, RTGUI_MODAL_CANCEL);
    else
    {
        rtgui_view_hide(view);
        rtgui_widget_destroy(RTGUI_WIDGET(view));
    }
}

运行记录如下:

finsh>>
—-[+]——rtgui_view_create: Logo View
touch up: (647, 441)
—-[+]——rtgui_view_create: main view
—-[-]——rtgui_view_destroy: Logo View
touch down: (727, 189)
touch up: (727, 189)
—-[+]——rtgui_view_create: Setup view
—-[-]——rtgui_view_destroy: main view
touch down: (641, 433)
touch up: (641, 433)
—-[+]——rtgui_view_create: main view
—-[-]——rtgui_view_destroy: Setup view
(mem->used) assert failed at rt_free:498

jerry619 2010-12-24

这家伙很懒，什么也没写！

发现原因了: 原来多个button不能共享同一个背景image.
否则在view关闭时就会出现这个(mem->used) assert failed at rt_free:498
例如这样就会出问题:


rtgui_image_t *image1;
rtgui_image_t *image2;
rtgui_button_t  *btn1;
rtgui_button_t  *btn2;
// 装入图片
image1 = rtgui_image_create_from_file("hdc", "/btn1.hdc", RT_FALSE);    
image2 = rtgui_image_create_from_file("hdc", "/btn2.hdc", RT_FALSE);
...
// 创建button1
btn1 = rtgui_button_create("button #1");
rtgui_button_set_pressed_image(btn1, image1);
rtgui_button_set_unpressed_image(btn1,image2);
.....
// 创建button2
btn2 = rtgui_button_create("button #2");
rtgui_button_set_pressed_image(btn2, image1);
rtgui_button_set_unpressed_image(btn2,image2);
....