在Qt 4.8.2中，restoreState和saveState不起作用

Question

代码是这样的：

file - ＆gt; Conf.cpp

#include <QWidget>
#include <QSettings>
#include <QMainWindow>


Conf::Conf(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Conf)
{
    ui->setupUi(this);

    //QCoreApplication :: setOrganizationDomain ("OrgDomain");
    //QCoreApplication :: setOrganizationName ("OrgName");
    //QCoreApplication :: setApplicationName ("AppName");
    //QCoreApplication :: setApplicationVersion ("1.0.0");


    QSettings settings;
    restoreGeometry(settings.value("mainWindowGeometry").toByteArray());
    restoreState(settings.value("mainWindowState").toByteArray());

}


Conf::~Conf()
{
    delete ui;
}


void Conf::on_pushButton_clicked()
{

    ......

    QSettings settings;
    settings.setValue("mainWindowGeometry", saveGeometry());
    settings.setValue("mainWindowState", saveState());

    close();

}

file - ＆gt; Conf.h

#include <QWidget>

namespace Ui {
class Conf;
}

class Conf : public QWidget
{
    Q_OBJECT

public:

    explicit Conf(QWidget *parent = 0);
    ~Conf();

private slots:

    void on_pushButton_clicked();

private:
    Ui::Conf *ui;
};

错误：

＆＃39; restoreStates＆＃39;未在此范围内声明

＆＃39; saveStates＆＃39;未在此范围内声明

我认为这个问题属于库，因为＆＃34; restoreGeometry＆＃34;和＆＃34; saveGeometry＆＃34;效果很好。

Answer 1

您的类继承到QWidget，但QWidget没有任何restoreState和saveState。它出现在QMainWindow。