QT中使用QXmlStreamReader解析XML文件

 

QT中使用QXmlStreamReader解析XML文件

分類： Qt 2010-05-24 17:04 3519人閱讀 評論(5) 收藏 舉報

轉載請註明鏈接與作者huihui1988

 

XML文件由於其擴展性與兼容性的優點，被廣泛用作軟件和系統的配置文件。這裏簡要介紹一下QT下如何來解析XML文件。

 

源代碼：

xml_reader.h

 

#ifndef XML_READER_H
#define XML_READER_H
#include <QtCore>
//#include <QtGui>
class xml_reader : public QXmlStreamReader
{
    //Q_OBJECT
public:
    xml_reader();
    bool read(QIODevice *device);
private:
    void read_data();
    void read_startweek();
    void read_eventnumber();
    void read_period();
    void read_id();
    void read_starttime();
    void read_endtime();
    void read_exception();
    void read_subexception();
    void read_description();
    void read_duration();
    void read_event();
    void read_offsettime();
    void read_eventdesc();
    void read_eventname();
    void read_prompt();
    void read_lasthandle();
    void read_unknow();
};
#endif // XML_READER_H

#ifndef XML_READER_H #define XML_READER_H #include <QtCore> //#include <QtGui> class xml_reader : public QXmlStreamReader { //Q_OBJECT public: xml_reader(); bool read(QIODevice *device); private: void read_data(); void read_startweek(); void read_eventnumber(); void read_period(); void read_id(); void read_starttime(); void read_endtime(); void read_exception(); void read_subexception(); void read_description(); void read_duration(); void read_event(); void read_offsettime(); void read_eventdesc(); void read_eventname(); void read_prompt(); void read_lasthandle(); void read_unknow(); }; #endif // XML_READER_H  

 

xml_reader.cpp

 

#include "xml_reader.h"
xml_reader::xml_reader()
{}
bool xml_reader::read(QIODevice *device)
{
    setDevice(device);
    while(!atEnd())
    {
        readNext();
        if(isStartElement())
        {
            if(name() == "data")
            {
                read_data();
            }
        }
    }
    return !error();
}
void xml_reader::read_data()
{
    qDebug()<<"Start to read data...";
    while(!atEnd())
    {
        readNext();
        if(isStartElement())
        {
            if(name() == "period")
            {
                read_period();
            }
            if(name() == "startweek")
            {
                read_startweek();
            }
            if(name() == "eventnumber")
            {
                read_eventnumber();
            }
        }
        if(isEndElement())
        {
            if(name() == "data")
            {
                qDebug()<<"Now at the end of data element...";
                break;
            }
        }
    }
}
void xml_reader::read_startweek()
{
    qDebug()<<"startweek is: "<<readElementText();
}
void xml_reader::read_eventnumber()
{
    qDebug()<<"eventNumber is: "<<readElementText();
}
void xml_reader::read_period()
{
    qDebug()<<"Start to read period...";
    while(!atEnd())
    {
        readNext();
        if(isStartElement())
        {
            if(name() == "id")
            {
                read_id();
            }
            if(name() == "starttime")
            {
                read_starttime();
            }
            if(name() == "endtime")
            {
                read_endtime();
            }
            if(name() == "exception")
            {
                read_exception();
            }
            if(name() == "duration")
            {
                read_duration();
            }
            if(name() == "event")
            {
                read_event();
            }
        }
        if(isEndElement())
        {
            if(name() == "period")
            {
            qDebug()<<"Now at the end of period...";
            break;
            }
        }
    }
}
void xml_reader::read_id()
{
    qDebug()<<"id is: " << readElementText();
}
void xml_reader::read_starttime()
{
    qDebug()<<"starttime is: " << readElementText();
}
void xml_reader::read_endtime()
{
    qDebug()<<"endtime is: " << readElementText();
}
void xml_reader::read_exception()
{
    qDebug()<<"Start to read exception...";
    while(!atEnd())
    {
        readNext();
        if(isStartElement())
        {
            if(name() == "subexception")
            {
                read_subexception();
            }
        }
        if(isEndElement())
        {
            if(name() == "exception")
            {
            qDebug()<<"Now at the end of exception...";
            break;
            }
        }
    }
}
void xml_reader::read_subexception()
{
    qDebug()<<"Start to read subexception...";
    while(!atEnd())
    {
        readNext();
        if(isStartElement())
        {
            if(name() == "id")
            {
                read_id();
            }
            if(name() == "starttime")
            {
                read_starttime();
            }
            if(name() == "endtime")
            {
                read_endtime();
            }
            if(name() == "description")
            {
                read_description();
            }
        }
        if(isEndElement())
        {
            if(name() == "subexception")
            {
            qDebug()<<"Now at the end of subexception...";
            break;
            }
        }
    }
}
void xml_reader::read_description()
{
    qDebug()<<"description is: " << readElementText();
}
void xml_reader::read_duration()
{
    qDebug()<<"duration is: " << readElementText();
}
void xml_reader::read_event()
{
    qDebug()<<"Start to read event...";
    while(!atEnd())
    {
        readNext();
        if(isStartElement())
        {
            if(name() == "id")
            {
                read_id();
            }
            if(name() == "offsettime")
            {
                read_offsettime();
            }
            if(name() == "eventdesc")
            {
                read_eventdesc();
            }
            if(name() == "lasthandle")
            {
                read_lasthandle();
            }
        }
        if(isEndElement())
        {
            if(name() == "event")
            {
            qDebug()<<"Now at the end of event..";
            break;
            }
        }
    }
}
void xml_reader::read_offsettime()
{
    qDebug()<<"offsettime is: " << readElementText();
}
void xml_reader::read_eventdesc()
{
    qDebug()<<"Start to read eventdesc...";
    while(!atEnd())
    {
        readNext();
        if(isStartElement())
         {
            if(name() == "eventname")
            {
                read_eventname();
            }
            if(name() == "prompt")
            {
                read_prompt();
            }
         }
        if(isEndElement())
        {
            if(name() == "eventdesc")
            {
                qDebug()<<"Now at the end of eventdesc...";
                break;
            }
        }
    }
}
void xml_reader::read_eventname()
{
    qDebug()<<"eventname is: " << readElementText();
}
void xml_reader::read_prompt()
{
    qDebug()<<"prompt is: " << readElementText();
}
void xml_reader::read_lasthandle()
{
    qDebug()<<"lasthandle is: " << readElementText();
}

#include "xml_reader.h" xml_reader::xml_reader() {} bool xml_reader::read(QIODevice *device) { setDevice(device); while(!atEnd()) { readNext(); if(isStartElement()) { if(name() == "data") { read_data(); } } } return !error(); } void xml_reader::read_data() { qDebug()<<"Start to read data..."; while(!atEnd()) { readNext(); if(isStartElement()) { if(name() == "period") { read_period(); } if(name() == "startweek") { read_startweek(); } if(name() == "eventnumber") { read_eventnumber(); } } if(isEndElement()) { if(name() == "data") { qDebug()<<"Now at the end of data element..."; break; } } } } void xml_reader::read_startweek() { qDebug()<<"startweek is: "<<readElementText(); } void xml_reader::read_eventnumber() { qDebug()<<"eventNumber is: "<<readElementText(); } void xml_reader::read_period() { qDebug()<<"Start to read period..."; while(!atEnd()) { readNext(); if(isStartElement()) { if(name() == "id") { read_id(); } if(name() == "starttime") { read_starttime(); } if(name() == "endtime") { read_endtime(); } if(name() == "exception") { read_exception(); } if(name() == "duration") { read_duration(); } if(name() == "event") { read_event(); } } if(isEndElement()) { if(name() == "period") { qDebug()<<"Now at the end of period..."; break; } } } } void xml_reader::read_id() { qDebug()<<"id is: " << readElementText(); } void xml_reader::read_starttime() { qDebug()<<"starttime is: " << readElementText(); } void xml_reader::read_endtime() { qDebug()<<"endtime is: " << readElementText(); } void xml_reader::read_exception() { qDebug()<<"Start to read exception..."; while(!atEnd()) { readNext(); if(isStartElement()) { if(name() == "subexception") { read_subexception(); } } if(isEndElement()) { if(name() == "exception") { qDebug()<<"Now at the end of exception..."; break; } } } } void xml_reader::read_subexception() { qDebug()<<"Start to read subexception..."; while(!atEnd()) { readNext(); if(isStartElement()) { if(name() == "id") { read_id(); } if(name() == "starttime") { read_starttime(); } if(name() == "endtime") { read_endtime(); } if(name() == "description") { read_description(); } } if(isEndElement()) { if(name() == "subexception") { qDebug()<<"Now at the end of subexception..."; break; } } } } void xml_reader::read_description() { qDebug()<<"description is: " << readElementText(); } void xml_reader::read_duration() { qDebug()<<"duration is: " << readElementText(); } void xml_reader::read_event() { qDebug()<<"Start to read event..."; while(!atEnd()) { readNext(); if(isStartElement()) { if(name() == "id") { read_id(); } if(name() == "offsettime") { read_offsettime(); } if(name() == "eventdesc") { read_eventdesc(); } if(name() == "lasthandle") { read_lasthandle(); } } if(isEndElement()) { if(name() == "event") { qDebug()<<"Now at the end of event.."; break; } } } } void xml_reader::read_offsettime() { qDebug()<<"offsettime is: " << readElementText(); } void xml_reader::read_eventdesc() { qDebug()<<"Start to read eventdesc..."; while(!atEnd()) { readNext(); if(isStartElement()) { if(name() == "eventname") { read_eventname(); } if(name() == "prompt") { read_prompt(); } } if(isEndElement()) { if(name() == "eventdesc") { qDebug()<<"Now at the end of eventdesc..."; break; } } } } void xml_reader::read_eventname() { qDebug()<<"eventname is: " << readElementText(); } void xml_reader::read_prompt() { qDebug()<<"prompt is: " << readElementText(); } void xml_reader::read_lasthandle() { qDebug()<<"lasthandle is: " << readElementText(); }  main.cpp

 

 

#include <QtCore/QCoreApplication>
#include "XmlPraser.h"
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QFile file("praser.xml");
    XmlPraser reader;
    if(file.open(QIODevice::ReadOnly | QIODevice::Text))
    {
        qDebug()<<"File has loaded...";
        reader.read(&file);
    }
    else
    {
        qDebug()<<"No file to read...";
    }
    file.close();
    qDebug()<<"Press ctrl+C to exit...";
    return a.exec();
}

#include <QtCore/QCoreApplication> #include "XmlPraser.h" int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); QFile file("praser.xml"); XmlPraser reader; if(file.open(QIODevice::ReadOnly | QIODevice::Text)) { qDebug()<<"File has loaded..."; reader.read(&file); } else { qDebug()<<"No file to read..."; } file.close(); qDebug()<<"Press ctrl+C to exit..."; return a.exec(); }  

 

XML文件範例 praser.xml

 

<?xml version="1.0" encoding="GBK" ?>
<data>
<startweek>2010-03-01 00:00:00.000</startweek>
<eventnumber>2</eventnumber>
<period>
<id>223401</id>
<starttime>2010-03-01 00:00:00.000</starttime>
<endtime>2010-06-20 23:59:59.999</endtime>
<exception>
<subexception>
<id>01</id>
<starttime>2010-04-03 00:00:00.000</starttime>
<endtime>2010-04-05 23:59:59.000</endtime>
<description>清明節放假三天</description>
</subexception>
<subexception>
<id>02</id>
<starttime>2010-05-01 00:00:00.000</starttime>
<endtime>2010-05-03 23:59:59.000</endtime>
<description>五一勞動節放假三天</description>
</subexception>
</exception>
<duration>0000-00-07 00:00:00.000</duration>
<event>
<id>01</id>
<offsettime>0000-00-00 14:00:00.000</offsettime>
<eventdesc>
<eventname>編譯原理</eventname>
<prompt>ring</prompt>
</eventdesc>
<lasthandle>null</lasthandle>
</event>
<event>
<id>02</id>
<offsettime>0000-00-03 09:50:00.000</offsettime>
<eventdesc>
<eventname>編譯原理</eventname>
<prompt>vibration</prompt>
</eventdesc>
<lasthandle>null</lasthandle>
</event>
</period>
</data>

<?xml version="1.0" encoding="GBK" ?> <data> <startweek>2010-03-01 00:00:00.000</startweek> <eventnumber>2</eventnumber> <period> <id>223401</id> <starttime>2010-03-01 00:00:00.000</starttime> <endtime>2010-06-20 23:59:59.999</endtime> <exception> <subexception> <id>01</id> <starttime>2010-04-03 00:00:00.000</starttime> <endtime>2010-04-05 23:59:59.000</endtime> <description>清明節放假三天</description> </subexception> <subexception> <id>02</id> <starttime>2010-05-01 00:00:00.000</starttime> <endtime>2010-05-03 23:59:59.000</endtime> <description>五一勞動節放假三天</description> </subexception> </exception> <duration>0000-00-07 00:00:00.000</duration> <event> <id>01</id> <offsettime>0000-00-00 14:00:00.000</offsettime> <eventdesc> <eventname>編譯原理</eventname> <prompt>ring</prompt> </eventdesc> <lasthandle>null</lasthandle> </event> <event> <id>02</id> <offsettime>0000-00-03 09:50:00.000</offsettime> <eventdesc> <eventname>編譯原理</eventname> <prompt>vibration</prompt> </eventdesc> <lasthandle>null</lasthandle> </event> </period> </data> 

 

 

由於是使用的QXmlStrramReader來進行解析，因而所有的節點都需要自己編寫函數進行相應的處理。