qt中实现配置文件

 QString fileName;    fileName = QCoreApplication::applicationDirPath();    fileName += "/SetConfigPara.ini";    qDebug()<<fileName;    QSettings settingcfg(fileName, QSettings::IniFormat);//    settingcfg.setValue("interval", 30);//    qDebug()<<settingcfg.value("interval").toInt();     // returns 30    settingcfg.setValue("inter", 6);    qDebug()<<settingcfg.value("interval").toDouble();  // returns 6.55