Question

我有一个QTableWidget，在单击某个单元格时会弹出一个QDialog。关闭QDialog后，QDialog将被删除。当我再次尝试单击该单元时，我的程序崩溃了。 getDaInx（）和getDaSMAC（）返回QStringLists。它们应该与我所拥有的问题完全无关。这是源代码：

QDialog *removeDialog;

// connect in MainWindow constructor
connect(ui->theTable, SIGNAL(cellClicked(int,int)), this, SLOT(handleCellClick(int,int)));

void MainWindow::handleCellClick(int row, int col)
{
    if (col == 9)
    {
        if (row > 0)
        {
            QGridLayout *removeLayout = new QGridLayout();

            for (int x = 1; x < getDaInx().length(); x++)
            {
                if (getDaInx().length() != getDaSMAC().length()) break;

                QString device = getDaSMAC()[x];
                QString inx = getDaInx()[x];

                QCheckBox *checkBox = new QCheckBox(QString("Remove    %1    %2").arg(inx).arg(device));
                if (x == row) checkBox->setChecked(true);
                checkBox->setParent(removeDialog);

                removeLayout->addWidget(checkBox, x, 0);
            }

            QPushButton *okBtn = new QPushButton("OK", removeDialog);
            QPushButton *cancelBtn = new QPushButton("Cancel", removeDialog);

            connect(okBtn, SIGNAL(clicked()), this, SLOT(handleRemoveDialogOk()));
            connect(cancelBtn, SIGNAL(clicked()), this, SLOT(handleRemoveDialogCancel()));

            int rowCount = removeLayout->rowCount();

            removeLayout->addWidget(okBtn, rowCount, 0);
            removeLayout->addWidget(cancelBtn, rowCount, 1);

            removeDialog = new QDialog(this);

            removeDialog->setLayout(removeLayout);

            removeDialog->exec();

            disconnect(okBtn, SIGNAL(clicked()), this, SLOT(handleRemoveDialogOk()));
            disconnect(cancelBtn, SIGNAL(clicked()), this, SLOT(handleRemoveDialogCancel()));

            delete removeDialog;
        }
    }
}

Answer 1

尝试创建这些：

    QPushButton *okBtn = new QPushButton("OK", removeDialog);
    QPushButton *cancelBtn = new QPushButton("Cancel", removeDialog);

之后：

    removeDialog = new QDialog(this);

Answer 2

您在初始化之前使用 removeDialog 指针会出现错误：

//...
checkBox->setParent(removeDialog);
//...
QPushButton *okBtn = new QPushButton("OK", removeDialog);
QPushButton *cancelBtn = new QPushButton("Cancel", removeDialog);
//...
removeDialog = new QDialog(this);

Qt对象删除导致崩溃

2 个答案: