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
的类使用：XmlListModel
xmlListModel能直接读取xml配置文件，快速方便开发，再加上自己写一个专门写入配置文件的类，两个就成了绝配啊！
代码：
datasbase.h

ifndef DATASBASE_H

define DATASBASE_H

include

include

include

include

include

class DatasBase : public QObject
{
Q_OBJECT
public:
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("/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()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
下面是写入音乐列表配置的代码例子

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

关键字：qt5, #c++#

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