应用初始化本地数据，需要读取配置文件，小编介绍如何通过xml简单写入配置文件，至于为什么选择这个格式，主要因为在qml中有一个很好

#ifndef DATASBASE_H#define DATASBASE_H#include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         class DatasBase : public QObject{    Q_OBJECTpublic:    explicit DatasBase(QObject *parent = 0);    ~DatasBase();    Q_INVOKABLE void setFileName(QString filename);    Q_INVOKABLE void writeStartDocument();    Q_INVOKABLE void writeStartElement(QString str);    Q_INVOKABLE void writeTextElement(QString elementT, QString content);    Q_INVOKABLE void writeEndElement();    Q_INVOKABLE void writeEndDocument();    Q_INVOKABLE bool openplaylistFile();    Q_INVOKABLE void closeplaylistFile();signals:public slots:private:    QFile *playListDatas;    QDir *playListDatasdir;    QXmlStreamWriter *xmlWriter;};#endif // DATASBASE_H
        
       
      
     
    

datasbase.cpp

#include "datasbase.h"#include 
    
     DatasBase::DatasBase(QObject *parent) : QObject(parent){//"file:///mnt/android/data/colorlight/playlist->xml"        //配置文件的路径        playListDatasdir=new QDir("/mnt/sdcard/Android/data/colorlight/playlist.xml");    //判断是否存在文件        if(!playListDatasdir->exists()){        qDebug()<<"mkdir**************"<< playListDatasdir->mkdir("/mnt/sdcard/Android/data/colorlight");    }        //初始化配置数据        playListDatas=new QFile("/mnt/sdcard/Android/data/colorlight/playlist.xml");    xmlWriter=new QXmlStreamWriter(playListDatas);    xmlWriter->setAutoFormatting(true);    qDebug()<<"path"<
     
      absolutePath();}DatasBase::~DatasBase(){}//设置配置文件的文件名void DatasBase::setFileName(QString filename){    playListDatas->setFileName(filename);}bool DatasBase::openplaylistFile(){    return playListDatas->open(QIODevice::WriteOnly | QIODevice::Text);}void DatasBase::writeStartDocument(){    xmlWriter->writeStartDocument();}void DatasBase::writeStartElement(QString str){    xmlWriter->writeStartElement(str);}void DatasBase::writeTextElement(QString elementT, QString content){    xmlWriter->writeTextElement(elementT,content);}void DatasBase::writeEndElement(){    xmlWriter->writeEndElement();}void DatasBase::writeEndDocument(){    xmlWriter->writeEndDocument();}void DatasBase::closeplaylistFile(){    playListDatas->close();    }
     
    

通过这个类，我们可以方便在qml中调用写入数据配置的文件

XmlListModel{        id:playlistModel        source:"file:///mnt/sdcard/Android/data/colorlight/playlist.xml"        query: "/data/music"        XmlRole{            name:"name";query: "name/string()";isKey: true        }        XmlRole{            name:"path";query: "path/string()";isKey: true        }        onStatusChanged: {            if(status==XmlListModel.Ready){                for(var mindex=0;mindex