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@H_502_9@#define NODEITERATOR_H@H_502_9@#include <QDomDocument>@H_502_9@@H_502_9@class NodeIterator@H_502_9@{@H_502_9@public:@H_502_9@NodeIterator();@H_502_9@NodeIterator(QDomNode root);@H_502_9@bool hasNext();@H_502_9@QDomNode next();@H_502_9@private:@H_502_9@QDomNode root, current;@H_502_9@@H_502_9@bool isHasNext;@H_502_9@};@H_502_9@@H_502_9@#endif // NODEITERATOR_H@H_502_9@ nodeiterator.cpp文件
#include "nodeiterator.h"@H_502_9@@H_502_9@NodeIterator::NodeIterator()@H_502_9@{@H_502_9@@H_502_9@@H_502_9@}@H_502_9@NodeIterator::NodeIterator(QDomNode root)@H_502_9@{@H_502_9@this->root = root;@H_502_9@current = root;@H_502_9@}@H_502_9@@H_502_9@bool NodeIterator::hasNext(){@H_502_9@@H_502_9@if (!root.isNull()) {@H_502_9@@H_502_9@//是否当前节点有子节点@H_502_9@if (!current.isNull() && current.hasChildNodes()) {@H_502_9@@H_502_9@//将第一个子节点变成当前节点@H_502_9@current = current.firstChildElement();@H_502_9@isHasNext = true;@H_502_9@@H_502_9@} else if (!current.isNull()&& !current.nextSiblingElement().isNull()) {@H_502_9@@H_502_9@@H_502_9@current = current.nextSiblingElement();@H_502_9@isHasNext = true;@H_502_9@@H_502_9@} else if (!current.isNull()) {@H_502_9@@H_502_9@while (!current.isNull() && current != root && current.nextSiblingElement().isNull()) {@H_502_9@@H_502_9@current = current.parentNode();@H_502_9@}@H_502_9@@H_502_9@if (!current.isNull() && current != root) {@H_502_9@@H_502_9@current = current.nextSiblingElement();@H_502_9@isHasNext = true;@H_502_9@@H_502_9@} else {@H_502_9@@H_502_9@isHasNext = false;@H_502_9@}@H_502_9@@H_502_9@} else {@H_502_9@@H_502_9@isHasNext = false;@H_502_9@}@H_502_9@@H_502_9@} else {@H_502_9@@H_502_9@isHasNext = false;@H_502_9@}@H_502_9@@H_502_9@return isHasNext;@H_502_9@}@H_502_9@QDomNode NodeIterator::next() {@H_502_9@return current;@H_502_9@}@H_502_9@@H_502_9@@H_502_9@ 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");@H_502_9@@H_502_9@if( !file->open(QFile::ReadOnly)){@H_502_9@qDebug()<<"open file Failed ";@H_502_9@return;@H_502_9@}@H_502_9@@H_502_9@QDomDocument *document=new QDomDocument;@H_502_9@QString strError;@H_502_9@int errLin = 0, errCol = 0;@H_502_9@@H_502_9@if( !document->setContent(file, false, &strError, &errLin, &errCol) ) {@H_502_9@printf( "parse file Failed\n");@H_502_9@return;@H_502_9@}@H_502_9@@H_502_9@if( document->isNull() ) {@H_502_9@printf( "document is null !\n" );@H_502_9@return;@H_502_9@}@H_502_9@@H_502_9@QDomElement root = document->documentElement();@H_502_9@//QIterator<Node>@H_502_9@@H_502_9@if (!root.isNull()) {@H_502_9@@H_502_9@QDomNode current;@H_502_9@@H_502_9@QString name , epTypeAlisaName ;@H_502_9@@H_502_9@for (NodeIterator *it = new NodeIterator((QDomNode)root); it->hasNext();) {@H_502_9@@H_502_9@current = it->next();@H_502_9@@H_502_9@if (!current.isNull() && current.isElement()) {@H_502_9@@H_502_9@name = current.nodeName();@H_502_9@//如果是电力图元的节点@H_502_9@if (!name.isNull() && name=="epType") {@H_502_9@epTypeAlisaName = current.toElement().attribute("alisaname");@H_502_9@QString electricType = current.toElement().attribute("electricType");@H_502_9@epTypeAlisaNames->append(epTypeAlisaName);@H_502_9@epTypeAlisaNameToElectricTypeName->insert(epTypeAlisaName,electricType);@H_502_9@@H_502_9@}@H_502_9@}@H_502_9@}@H_502_9@}@H_502_9@
