QDomDocument解析XML文件

最新推荐文章于 2024-07-08 17:59:44 发布

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最新推荐文章于 2024-07-08 17:59:44 发布

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本文档介绍如何在C++中通过QDomDocument库解析XML文件，详细讲解了主要步骤和关键代码，帮助读者理解XML文件的读取与解析过程。

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domparsexml.h

#ifndef DOMPARSEXML_H

#define DOMPARSEXML_H

#include <QWidget>

#include <QDomDocument>

#include <QFile>

#include <QTextStream>

namespace Ui {

class DomParseXML;

class DomParseXML : public QWidget

    Q_OBJECT

public:

    explicit DomParseXML(QWidget *parent = 0);

    ~DomParseXML();

public:

    int writeXML();

    int readXML();

private:

    QString fileName;

private:

    Ui::DomParseXML *ui;

};

#endif // DOMPARSEXML_H

domparsexml.cpp

#include "domparsexml.h"

#include "ui_domparsexml.h"

#include <QApplication>

#include <QMessageBox>

#include <QDebug>

DomParseXML::DomParseXML(QWidget *parent) :

    QWidget(parent),

    ui(new Ui::DomParseXML)

    ui->setupUi(this);

    fileName = qApp->applicationDirPath() + "domparse.xml";

DomParseXML::~DomParseXML()

    delete ui;

int DomParseXML::writeXML()

    QFile file(fileName);

    if(!file.open(QIODevice::WriteOnly | QIODevice::Text))

        QMessageBox::information(NULL,"title","open error!");

        return -2;

    QTextStream out(&file);

    QDomDocument doc;

    QDomText text;

    QDomElement element;

    QDomAttr attr;

    QDomProcessingInstruction instruction;

    instruction = doc.createProcessingInstruction("xml","version = \'1.0\' encoding=\'UTF-8\'");

    doc.appendChild(instruction);

    QDomElement root = doc.createElement("COMMAND");

    doc.appendChild(root);

    element = doc.createElement("OBJECT");

    text = doc.createTextNode("USER");

    element.appendChild(text);

    root.appendChild(element);

    element = doc.createElement("ACTION");

    text = doc.createTextNode("LOGIN");

    element.appendChild(text);

    root.appendChild(element);

    element = doc.createElement("DATA");

    root.appendChild(element);

    QDomElement userElement = doc.createElement("USER");

    attr = doc.createAttribute("NAME");

    attr.setValue("root");

    userElement.setAttributeNode(attr);

    attr = doc.createAttribute("PASSWORD");

    attr.setValue("123456");

    userElement.setAttributeNode(attr);

    element.appendChild(userElement);

    doc.save(out,4);

    return 0;

int DomParseXML::readXML()

    QDomDocument doc;

    QFile file(fileName);

    QString error = "";

    int row = 0,column = 0;

    if(!file.open(QIODevice::ReadOnly))

        qDebug() << "open error!";

        return -2;

    if(!doc.setContent(&file,false,&error,&row,&column))

        qDebug() << "parse file failed:" << row << "---" << column <<":" <<error;

        file.close();

        return -1;

    file.close();

    QDomElement root = doc.documentElement();

    QDomNode node = root.firstChild();

    while(!node.isNull())

        QDomElement element = node.toElement();

        if(!element.isNull())

            qDebug() << element.tagName() << ":" << element.text();

            QDomNode nodeson = element.firstChild();

            while(!nodeson.isNull())

                QDomElement elementson = nodeson.toElement();

                if(!elementson.isNull())

                    qDebug()<< "---" <<elementson.tagName();

                    if(elementson.hasAttribute("NAME"))

                        qDebug()<< "---" << "NAME=" << elementson.attributeNode("NAME").value();

                    if(elementson.hasAttribute("PASSWORD"))

                        qDebug()<< "---" << "PASSWORD=" << elementson.attributeNode("PASSWORD").value();

                nodeson = nodeson.nextSibling();

        node = node.nextSibling();

    return 0;

main.cpp

#include "domparsexml.h"

#include <QApplication>

int main(int argc, char *argv[])

    QApplication a(argc, argv);

    DomParseXML w;

    w.writeXML();

    w.readXML();

    return a.exec();