Qt操作xml

1、Config.h

#ifndef CONFIG_H
#define CONFIG_H
#include <QString>
#include <QFile>
#include <QDebug>
#include <QDomDocument>

class Config
{
public:
    /*获取单例*/
    static Config& getInstance();
    /*获取文件夹目录*/
    static QString getFilePath();
private:
    Config();
    static QDomElement m_element;                       //xml对象
    const QString XML_PATH = "/cfg/cfg.xml";            //xml路径
};

#endif // CONFIG_H

2、Config.cpp

#include "config.h"
#include <QDir>
Config::Config()
{
    QString pathStr = QDir::currentPath() + XML_PATH;
    QDomDocument doc;
    QFile file(pathStr);
    if(file.open(QFile::ReadOnly)){
        if(doc.setContent(&file)){
            m_element = doc.documentElement(); //返回根节点
        }
        file.close();
    }else{
        qDebug() << "xml file open faild.";
    }
}


QDomElement Config::m_element;
Config& Config::getInstance()
{
    static Config instance;
    return instance;
}

QString Config::getFilePath()
{
    QString ret;
    for(int stepIndex = 0; stepIndex < m_element.childNodes().size(); stepIndex++) {
        QDomElement oneElment = m_element.childNodes().at(stepIndex).toElement();
        if("quality_file_path" == oneElment.tagName()){
            ret = oneElment.text();
            break;
        }
    }
    return ret;
}