XML 解析之SAX

代碼出自Qt Creator 快速入門，這裡只是做個記載

mysax.h

#ifndef MYSAX_H#define MYSAX_H#include <QXmlDefaultHandler>class QListWidget;class MySAX : public QXmlDefaultHandler{public:    MySAX();    ~MySAX();    bool readFile(const QString &fileName);protected:    bool startElement(const QString &namespaceURI, const QString &localName,                      const QString &qName, const QXmlAttributes &atts);    bool endElement(const QString &namespaceURI, const QString &localName,                    const QString &qName);    bool characters(const QString &ch);    bool fatalError(const QXmlParseException &exception);private:    QListWidget *list;    QString currentText;};#endif // MYSAX_H

mysax.cpp

#include "mysax.h"#include <QtXml>#include <QListWidget>MySAX::MySAX(){    list = new QListWidget;    list->show();}MySAX::~MySAX(){    delete list;}bool MySAX::readFile(const QString &fileName){    QFile file(fileName);    // 讀取檔案內容    QXmlInputSource inputSource(&file);    // 建立QXmlSimpleReader對象    QXmlSimpleReader reader;    // 設定內容處理器    reader.setContentHandler(this);    // 設定錯誤處理器    reader.setErrorHandler(this);    // 解析檔案    return reader.parse(inputSource);}// 已經解析完一個元素的起始標籤bool MySAX::startElement(const QString &namespaceURI, const QString &localName,                         const QString &qName, const QXmlAttributes &atts){    if (qName == "library")        list->addItem(qName);    else if (qName == "book")        list->addItem("    " + qName + atts.value("id"));    return true;}// 已經解析完一塊字元資料bool MySAX::characters(const QString &ch){    currentText = ch;    return true;}// 已經解析完一個元素的結束標籤bool MySAX::endElement(const QString &namespaceURI, const QString &localName,                       const QString &qName){    if (qName == "title" || qName == "author")        list->addItem("        " + qName + " : " + currentText);    return true;}// 錯誤處理bool MySAX::fatalError(const QXmlParseException &exception){    qDebug() << exception.message();    return false;}

 

main.cpp

#include "mysax.h"#include <QApplication>int main(int argc, char* argv[]){    QApplication app(argc, argv);    MySAX sax;    sax.readFile("../mySAX/my.xml");    return app.exec();}