Question

我有一个QML / C ++混合应用程序，它相当复杂，有几个线程在后台更新数据。一切都运行完美，除非我将某个ListView可见，填充然后退出应用程序，调试器在以下位置断言，断言失败：

QDeclarativeAbstractBinding::~QDeclarativeAbstractBinding()
{
    Q_ASSERT(m_prevBinding == 0); //<---- THIS GUY IS THE OFFENDING LINE
    Q_ASSERT(m_mePtr == 0); 
}

这是堆栈跟踪：

>   QtCored4.dll!qt_message_output(QtMsgType msgType, const char * buf)  Line 2270  C++
    QtCored4.dll!qt_message(QtMsgType msgType, const char * msg, char * ap)  Line 2328 + 0x12 bytes C++
    QtCored4.dll!qFatal(const char * msg, ...)  Line 2511 + 0xf bytes   C++
    QtCored4.dll!qt_assert(const char * assertion, const char * file, int line)  Line 2027 + 0x16 bytes C++
    QtDeclaratived4.dll!QDeclarativeAbstractBinding::~QDeclarativeAbstractBinding()  Line 293 + 0x1e bytes  C++
    QtDeclaratived4.dll!QDeclarativeCompiledBindingsPrivate::Binding::~Binding()  + 0x3d bytes  C++
    QtDeclaratived4.dll!`eh vector destructor iterator'(void * ptr, unsigned int size, int count, void (void *)* pDtor)  + 0x6b bytes   C++
    QtDeclaratived4.dll!QDeclarativeCompiledBindingsPrivate::Binding::`vector deleting destructor'()  + 0x26 bytes  C++
    QtDeclaratived4.dll!QDeclarativeCompiledBindings::~QDeclarativeCompiledBindings()  Line 274 + 0x33 bytes    C++
    QtDeclaratived4.dll!QDeclarativeCompiledBindings::`scalar deleting destructor'()  + 0xf bytes   C++
    QtDeclaratived4.dll!QDeclarativeRefCount::release()  Line 66 + 0x20 bytes   C++
    QtDeclaratived4.dll!QDeclarativeCompiledBindingsPrivate::Binding::destroy()  Line 328   C++
    QtDeclaratived4.dll!QDeclarativeData::destroyed(QObject * object)  Line 1000    C++
    QtDeclaratived4.dll!QDeclarativeData::destroyed(QAbstractDeclarativeData * d, QObject * o)  Line 463    C++
    QtCored4.dll!QObject::~QObject()  Line 860 + 0x11 bytes C++
    QtDeclaratived4.dll!QDeclarativeAbstractAnimation::~QDeclarativeAbstractAnimation()  Line 94 + 0x2a bytes   C++
    QtDeclaratived4.dll!QDeclarativePropertyAnimation::~QDeclarativePropertyAnimation()  Line 1827 + 0x8 bytes  C++
    QtDeclaratived4.dll!QDeclarativePrivate::QDeclarativeElement<QDeclarativePropertyAnimation>::~QDeclarativeElement<QDeclarativePropertyAnimation>()  Line 90 + 0xf bytes C++
    QtDeclaratived4.dll!QDeclarativePrivate::QDeclarativeElement<QDeclarativePropertyAnimation>::`scalar deleting destructor'()  + 0xf bytes    C++
    QtCored4.dll!QObjectPrivate::deleteChildren()  Line 1949 + 0x24 bytes   C++
    QtCored4.dll!QObject::~QObject()  Line 947  C++
    QtDeclaratived4.dll!QDeclarativeTransition::~QDeclarativeTransition()  Line 168 + 0x9 bytes C++
    QtDeclaratived4.dll!QDeclarativePrivate::QDeclarativeElement<QDeclarativeTransition>::~QDeclarativeElement<QDeclarativeTransition>()  Line 90 + 0xf bytes   C++
    QtDeclaratived4.dll!QDeclarativePrivate::QDeclarativeElement<QDeclarativeTransition>::`scalar deleting destructor'()  + 0xf bytes   C++
    QtCored4.dll!QObjectPrivate::deleteChildren()  Line 1949 + 0x24 bytes   C++
    QtCored4.dll!QObject::~QObject()  Line 947  C++
    QtGuid4.dll!QGraphicsObject::~QGraphicsObject()  + 0x48 bytes   C++
    QtDeclaratived4.dll!QDeclarativeItem::~QDeclarativeItem()  Line 1504 + 0x1f bytes   C++
    QtDeclaratived4.dll!QDeclarativeRectangle::~QDeclarativeRectangle()  + 0xf bytes    C++
    QtDeclaratived4.dll!QDeclarativePrivate::QDeclarativeElement<QDeclarativeRectangle>::~QDeclarativeElement<QDeclarativeRectangle>()  Line 90 + 0xf bytes C++
    QtDeclaratived4.dll!QDeclarativePrivate::QDeclarativeElement<QDeclarativeRectangle>::`scalar deleting destructor'()  + 0xf bytes    C++
    QtDeclaratived4.dll!QDeclarativeViewPrivate::~QDeclarativeViewPrivate()  Line 135 + 0x67 bytes  C++
    QtDeclaratived4.dll!QDeclarativeViewPrivate::`scalar deleting destructor'()  + 0xf bytes    C++
    QtCored4.dll!QScopedPointerDeleter<QObjectData>::cleanup(QObjectData * pointer)  Line 62 + 0x20 bytes   C++
    QtCored4.dll!QScopedPointer<QObjectData,QScopedPointerDeleter<QObjectData> >::~QScopedPointer<QObjectData,QScopedPointerDeleter<QObjectData> >()  Line 100 + 0x9 bytes  C++
    QtCored4.dll!QObject::~QObject()  Line 963 + 0x12 bytes C++
    QtGuid4.dll!QWidget::~QWidget()  Line 1620 + 0x25 bytes C++
    QtGuid4.dll!QFrame::~QFrame()  Line 242 + 0x8 bytes C++
    QtGuid4.dll!QAbstractScrollArea::~QAbstractScrollArea()  Line 526 + 0xf bytes   C++
    QtGuid4.dll!QGraphicsView::~QGraphicsView()  Line 1165 + 0xf bytes  C++
    QtDeclaratived4.dll!QDeclarativeView::~QDeclarativeView()  Line 300 + 0x9 bytes C++
    MyApplication.exe!QDeclarativeView::`scalar deleting destructor'()  + 0x10 bytes    C++
    QtCored4.dll!QObjectPrivate::deleteChildren()  Line 1949 + 0x24 bytes   C++
    QtGuid4.dll!QWidget::~QWidget()  Line 1602  C++
    QtGuid4.dll!QMainWindow::~QMainWindow()  Line 389 + 0x22 bytes  C++
    MyApplication.exe!MainWindow::~MainWindow()  Line 77 + 0x66 bytes   C++
    MyApplication.exe!MainWindow::`scalar deleting destructor'()  + 0xf bytes   C++
    MyApplication.exe!boost::checked_delete<MainWindow>(MainWindow * x)  Line 34 + 0x21 bytes   C++
    MyApplication.exe!boost::detail::sp_counted_impl_p<MainWindow>::dispose()  Line 78 + 0xc bytes  C++
    MyApplication.exe!boost::detail::sp_counted_base::release()  Line 103   C++
    MyApplication.exe!boost::detail::shared_count::~shared_count()  Line 221    C++
    MyApplication.exe!boost::shared_ptr<MainWindow>::~shared_ptr<MainWindow>()  + 0x12 bytes    C++
    MyApplication.exe!boost::shared_ptr<MainWindow>::reset()  Line 387  C++
    MyApplication.exe!main(int argc, char * * argv)  Line 68    C++
    MyApplication.exe!WinMain(HINSTANCE__ * instance, HINSTANCE__ * prevInstance, char * __formal, int cmdShow)  Line 131 + 0x12 bytes  C++
    MyApplication.exe!__tmainCRTStartup()  Line 547 + 0x2c bytes    C
    MyApplication.exe!WinMainCRTStartup()  Line 371 C
    kernel32.dll!@BaseThreadInitThunk@12()  + 0x12 bytes    
    ntdll.dll!___RtlUserThreadStart@8()  + 0x27 bytes   
    ntdll.dll!__RtlUserThreadStart@8()  + 0x1b bytes

编辑：

问题：我怎样才能消除这个问题？我的代码可能有什么问题？没有关于如何发生这种情况的信息。

Answer 1

如果没有看到应用程序代码，很难知道发生了什么。此外，如果可以创建一个再现此崩溃的独立示例，我建议在https://bugreports.qt.io处提交错误。

Answer 2

对于迟到的回复感到抱歉，我检查了我的QML文件，发现当我在单个“State”元素中定义多个具有相同目标的“PropertyChange”元素时会发生错误。我在一个“PropertyChange”元素中对同一项的所有属性更改进行了分组，问题就消失了。但这很奇怪，断言失败并不是很明确。还尝试使用此信息重现错误但无法成功。可能还有其他因素我想念。不管怎样，谢谢。

退出时QT QML / C ++应用程序崩溃

2 个答案: