窗口信息保存

读取 

        QSettings settings(“MyOrganization”, “MyApp”);
        QString savedText = settings.value(“lineEditText”, “”).toString();
        _ui->lineEdit->setText(savedText);

写入

        QSettings settings(“MyOrganization”, “MyApp”);
        settings.setValue(“lineEditText”, _ui->lineEdit->text());
        QWidget::hideEvent(e);