QT读写ini

//Write
   QSettings settings("zhu.ini",QSettings::IniFormat);
    settings.beginGroup("mainwindow");
    settings.setValue("size", 100);
    settings.setValue("name", settings.applicationName());
    settings.endGroup();

    settings.beginGroup("outputpanel");
    settings.setValue("visible", true);
    settings.endGroup();

    settings.beginWriteArray("logins");
    for (int i = 0; i < 5; ++i) {
        settings.setArrayIndex(i);
        settings.setValue("userName", i);
        settings.setValue("password", i*100);
    }
    settings.endArray();
    settings.sync();

//Read
    QSettings settings("zhu.ini",QSettings::IniFormat);

    settings.beginGroup("mainwindow");
    int size = settings.value("size").toInt();
    QString name = settings.value("name").toString();
    settings.endGroup();
    int c = settings.beginReadArray("logins");
    for(int i = 0;i<c;i++){
        settings.setArrayIndex(i);
        int userName = settings.value("userName").toInt();
        int password = settings.value("password").toInt();
    }

    settings.endArray();