qt 解析XML

QDomDocument parsing Example XML file <?xmlversion="1.0"encoding="UTF-8"?>
<persons>
<personid="1">
<firstname>John</firstname>
<surname>Doe</surname>
<email>john.doe@example.com</email>
<website>http://en.wikipedia.org/wiki/John_Doe</website>
</person>
<personid="2">
<firstname>Jane</firstname>
<surname>Doe</surname>
<email>jane.doe@example.com</email>
<website>http://en.wikipedia.org/wiki/John_Doe</website>
</person>
<personid="3">
<firstname>Matti</firstname>
<surname>Meikäläinen</surname>
<email>matti.meikalainen@example.com</email>
<website>http://fi.wikipedia.org/wiki/Matti_Meikäläinen</website>
</person>
</persons> Header file class QXSRExample :public QMainWindow
{
Q_OBJECT
 
public:
QXSRExample(QWidget *parent = 0);
~QXSRExample();
private slots:
void parseXML();
private:
QPointer<QVBoxLayout> _layout;
void setupUI();
void addPersonsToUI(QList< QMap<QString,QString>>& persons);
};Source filevoid QXSRExample::parseXML(){
/* We'll parse the example.xml */
QFile* file =new QFile("C://example.xml");
/* If we can't open it, let's show an error message. */
if(!file->open(QIODevice::ReadOnly| QIODevice::Text)){
QMessageBox::critical(this,
"QXSRExample::parseXML",
"Couldn't open example.xml",
QMessageBox::Ok);
return;
}
 
QList< QMap<QString,QString>> persons;
 
/* QDomDocument takes any QIODevice. as well as QString buffer*/
QDomDocument doc("mydocument");
if(!doc.setContent(file))
{
return;
}
 
//Get the root element
QDomElement docElem = doc.documentElement();
 
// you could check the root tag name here if it matters
QString rootTag = docElem.tagName();// == persons
 
// get the node's interested in, this time only caring about person's
QDomNodeList nodeList = docElem.elementsByTagName("person");
 
//Check each node one by one.
for(int ii =0;ii < nodeList.count(); ii++)
{
QMap<QString, QString> person;
 
// get the current one as QDomElement
QDomElement el = nodeList.at(ii).toElement();
 
person["id"]= el.attribute("id");// get and set the attribute ID
 
//get all data for the element, by looping through all child elements
QDomNode pEntries = el.firstChild();
while(!pEntries.isNull()){
QDomElement peData = pEntries.toElement();
QString tagNam = peData.tagName();
 
if(tagNam =="firstname"){/* We've found first name. */
person["firstname"]= peData.text();
}elseif(tagNam =="surname"){/* We've found surname. */
person["surname"]= peData.text();
}elseif(tagNam =="email"){/* We've found email. */
person["email"]= peData.text();
}elseif(tagNam =="website"){/* We've found website. */
person["website"]= peData.text();
}
 
pEntries = pEntries.nextSibling();
}
 
persons.append(person);
}
 
this->addPersonsToUI(persons);
}