Question

由于某些原因，我正在编写QT程序。在一段代码中，有时我会获得双重免费或损坏错误，但不是100％的情况。例如，我按下按钮时会执行此代码：

void manureman::on_BitBtn3_clicked()
{
    mnrmanothprods *otherprods = new mnrmanothprods(this,database,currentSystem);
    moduleSubScreen m_dialogWindow;
    m_dialogWindow.loadSubScreen(otherprods);
    m_dialogWindow.setWindowTitle("Purchased products for manure management");
    qDebug() << "Loading window";
    m_dialogWindow.exec();
    qDebug() << "After loading window";

    qDebug() << "Exiting";
}

mnrmanothprods是一个QWidget，它在内部创建4个QWidget指针，所有指针都是mnrmanothprods作为父级：

void mnrmanothprods::loadForm()
{
  m_colModel = new fieldInColModel(this);
  m_periodModel = new periodTableModel(this);
}

QAbstractItemDelegate* mnrmanothprods::constructCustomDelegator(QString, QString field)
{
    if (field == "COLLECTED")
    {
        imageCheckDelegate *ckhdelegate = new imageCheckDelegate(this);
        ckhdelegate->setCheckPixMap(QPixmap(":/images/ok.png"));
        ckhdelegate->setUnCheckPixMap(QPixmap(":/images/nocheck.png"));
        return ckhdelegate;
    }
    if (field == "ava")
    {
        imageCheckDelegate *ckhdelegate = new imageCheckDelegate(this);
        ckhdelegate->setCheckPixMap(QPixmap(":/images/ok.png"));
        ckhdelegate->setUnCheckPixMap(QPixmap(":/images/nocheck.png"));
        ckhdelegate->addIgnoredColumn(0);
        return ckhdelegate;
    }
    return 0;
}

moduleSubScreen类仅将mnrmanothprods添加到布局中：

    void moduleSubScreen::loadSubScreen(impgenmaint *child)
    {
        m_child = child;
        connect(m_child,SIGNAL(closeCalled()),this,SLOT(close()));
        ui->MainLayout->addWidget(child);
    }

我将调试信息放在我的类的每个析构函数中，所以在关闭对话框后我通常会得到：

Debug: After loading window 
Debug: Exiting 
Debug: Before destroy moduleSubScreen UI 
Debug: After destroy moduleSubScreen UI 
Debug: After m_child = 0 
Debug: Before destroy mnrmanothprods UI 
Debug: After destroy mnrmanothprods UI 
Debug: Destroy: fieldInColModel 
Debug: Destroy imageCheckDelegate 
Debug: Destroy: periodTableModel 
Debug: Destroy imageCheckDelegate

Howerver，随机，有时我只得到部分调试的双删除错误：

Debug: After loading window 
    Debug: Exiting 
    Debug: Before destroy moduleSubScreen UI 
    Debug: After destroy moduleSubScreen UI 
    Debug: After m_child = 0 
    Debug: Before destroy mnrmanothprods UI 
    Debug: After destroy mnrmanothprods UI 
    Debug: Destroy: fieldInColModel

知道如何才能捕捉到这个错误...或者为什么这样的错误不会一直发生？

感谢。卡洛斯

Answer 1

您可以使用工具来提供帮助。像Valgrind这样的东西通常很擅长找到这种东西。

随机双重免费或损坏错误

1 个答案: