Qt程序关闭弹出确定框

void QJInterface::closeEvent(QCloseEvent *event)
{
    QDialog* log = new QDialog(this);
    log->setObjectName("log");
    log->setStyleSheet("#log{background:#3379B7;}");
    log->deleteLater();
    log->setWindowTitle("退出平台");
    log->resize(200,100);
//    log->setWindowFlags(Qt::Dialog | Qt::FramelessWindowHint);
    QLabel* lel = new QLabel(log);
    lel->setText("确定退出平台吗?");
    lel->setStyleSheet("QLabel{font-family:‘宋体‘;font-size:20px;color:white;background:#3379B7;}");
    lel->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
    QPushButton* okBtn = new QPushButton(log);
    QPushButton* clsBtn = new QPushButton(log);
    okBtn->setStyleSheet("QPushButton{color: green;min-width:75px;max-width:75px;min-height:20px;border:1px solid white;border-radius:5px;}"
                         "QPushButton:hover{background-color: #333333;border-color: #444444;color:rgb(255,255,255);}"
                         "QPushButton:pressed{background-color: #111111;border-color: #333333;color: yellow;}");
    clsBtn->setStyleSheet("QPushButton{color: green;min-width:75px;max-width:75px;min-height:20px;border:1px solid white;border-radius:5px;}"
                         "QPushButton:hover{background-color: #333333;border-color: #444444;color:rgb(255,255,255);}"
                         "QPushButton:pressed{background-color: #111111;border-color: #333333;color: yellow;}");
    okBtn->setText("确定");
    clsBtn->setText("取消");
    okBtn->setMaximumWidth(100);
    clsBtn->setMaximumWidth(100);

    QObject::connect(okBtn,&QPushButton::clicked,[=]()
    {
        log->done(1);
    });
    QObject::connect(clsBtn,&QPushButton::clicked,[=]()
    {
        log->done(0);
    });
    QHBoxLayout* hLayout = new QHBoxLayout();
    hLayout->setSpacing(5);
    hLayout->addStretch();
    hLayout->addWidget(okBtn);
    hLayout->addWidget(clsBtn);
    QVBoxLayout* v = new QVBoxLayout();
    v->addWidget(lel);
    v->addItem(hLayout);
    log->setLayout(v);
    if(1==log->exec())
    {
        event->accept();
    }
    else
    {
        event->ignore();
    }
}