#include <QtGui>

 #include <QtXml>

 #include <iostream>

 //创建一个树结构

 void populateTree(QTreeWidget *treeWidget)

 {

     QStringList labels;

     labels << QObject::tr("Terms") << QObject::tr("Pages");

     treeWidget->setHeaderLabels(labels);

     treeWidget->header()->setResizeMode(QHeaderView::Stretch);

     treeWidget->setWindowTitle(QObject::tr("XML Stream Writer"));

     treeWidget->show();

     (void) new QTreeWidgetItem(treeWidget,

             QStringList() << "sidebearings" << "10, 34-35, 307-308");

     QTreeWidgetItem *subterm = new QTreeWidgetItem(treeWidget,

             QStringList() << "subtraction");

     (void) new QTreeWidgetItem(subterm,

             QStringList() << "of pictures" << "115, 244");

     (void) new QTreeWidgetItem(subterm,

             QStringList() << "of vectors" << "");

 }

 //生成一个新的开始标签

 void writeIndexEntry(QXmlStreamWriter *xmlWriter, QTreeWidgetItem *item)

 {

     //创建一个开始标签

     xmlWriter->writeStartElement("entry");

     //给标签添加属性

     xmlWriter->writeAttribute("term", item->text());

     //获取子树的第二个元素

     QString pageString = item->text();

     //根据','拆开

     if (!pageString.isEmpty()) {

         QStringList pages = pageString.split(", ");

         //依次写入Text元素

         foreach (QString page, pages)

             xmlWriter->writeTextElement("page", page);

     }

     //如果有子项则递归调用

     for (int i = ; i < item->childCount(); ++i)

         writeIndexEntry(xmlWriter, item->child(i));

     xmlWriter->writeEndElement();

 }

 bool writeXml(const QString &fileName, QTreeWidget *treeWidget)

 {

     QFile file(fileName);

     if (!file.open(QFile::WriteOnly | QFile::Text)) {

         std::cerr << "Error: Cannot write file "

                   << qPrintable(fileName) << ": "

                   << qPrintable(file.errorString()) << std::endl;

         return false;

     }

     //写xml

     QXmlStreamWriter xmlWriter(&file);

     xmlWriter.setAutoFormatting(true);

     //写首行<?xml version="1.0" encoding="UTF-8">

     xmlWriter.writeStartDocument();

     //生成一个开始标签

     xmlWriter.writeStartElement("bookindex");

     //对于每一个顶级项,调用writeIndexEntry函数

     for (int i = ; i < treeWidget->topLevelItemCount(); ++i)

         writeIndexEntry(&xmlWriter, treeWidget->topLevelItem(i));

     xmlWriter.writeEndDocument();

     file.close();

     if (file.error()) {

         std::cerr << "Error: Cannot write file "

                   << qPrintable(fileName) << ": "

                   << qPrintable(file.errorString()) << std::endl;

         return false;

     }

     return true;

 }

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

 {

     QApplication app(argc, argv);

     QTreeWidget treeWidget;

     populateTree(&treeWidget);

     writeXml("out1.xml", &treeWidget);

     return app.exec();

 }