QT 遍历多层次的XML文档

网上的例子大多是简单的例子的使用，但是对于多层次的或是未知层次的没有相应的记录。自己写了一个QT版的遍历XML的类NodeIterator

nodeiterator.h文件

#ifndef NODEITERATOR_H

#define NODEITERATOR_H

#include <QDomDocument>

class NodeIterator

{

public:

NodeIterator();

NodeIterator(QDomNode root);

bool hasNext();

QDomNode next();

private:

QDomNode root, current;

bool isHasNext;

};

#endif // NODEITERATOR_H

nodeiterator.cpp文件

#include "nodeiterator.h"

NodeIterator::NodeIterator()

{

}

NodeIterator::NodeIterator(QDomNode root)

{

this->root = root;

current = root;

}

bool NodeIterator::hasNext(){

if (!root.isNull()) {

//是否当前节点有子节点

if (!current.isNull() && current.hasChildNodes()) {

//将第一个子节点变成当前节点

current = current.firstChildElement();

isHasNext = true;

} else if (!current.isNull()&& !current.nextSiblingElement().isNull()) {

current = current.nextSiblingElement();

isHasNext = true;

} else if (!current.isNull()) {

while (!current.isNull() && current != root && current.nextSiblingElement().isNull()) {

current = current.parentNode();

}

if (!current.isNull() && current != root) {

    current = current.nextSiblingElement();

    isHasNext = true;

} else {

isHasNext = false;

}

} else {

isHasNext = false;

}

} else {

isHasNext = false;

}

return isHasNext;

}

QDomNode NodeIterator::next() {

return current;

}

有了这个类就可以根据名称检索相应的节点

QFile *file=new QFile("D:/qt project/SymbolEdit/symbol.xml");

if( !file->open(QFile::ReadOnly)){

qDebug()<<"open file failed ";

return;

}

QDomDocument   *document=new QDomDocument;

QString         strError;

int        errLin = 0, errCol = 0;

if( !document->setContent(file, false, &strError, &errLin, &errCol) ) {

printf( "parse file failed\n");

return;

}

if( document->isNull() ) {

printf( "document is null !\n" );

return;

}

QDomElement root = document->documentElement();

//QIterator<Node>

if (!root.isNull()) {

QDomNode current;

QString name , epTypeAlisaName ;

for (NodeIterator *it = new NodeIterator((QDomNode)root); it->hasNext();) {

current = it->next();

if (!current.isNull() && current.isElement()) {

name = current.nodeName();

//如果是电力图元的节点

if (!name.isNull() && name=="epType") {

epTypeAlisaName = current.toElement().attribute("alisaname");

QString electricType = current.toElement().attribute("electricType");

epTypeAlisaNames->append(epTypeAlisaName);

epTypeAlisaNameToElectricTypeName->insert(epTypeAlisaName,electricType);

}

}

}

}