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Cocos2d-x xml解析

Cocos2d-x 已经加入了tinyxml2用于xml的解析。3.0版本位于external/tinyxml2下。2.x版本位于cocos2dx/support/tinyxml2下。

tinyxml2 Github地址：https://github.com/leethomason/tinyxml2

帮助文档地址：http://grinninglizard.com/tinyxml2docs/index.html

##生成xml文档

  1. 引入头文件

    #include "tinyxml2/tinyxml2.h"
using namespace tinyxml2;

  2. xml文档生成

    void  HelloWorld::makeXML(const char *fileName)

{ std::string filePath = FileUtils::getInstance()->getWritablePath() + fileName;

XMLDocument *pDoc = new XMLDocument();

//xml 声明（参数可选）
XMLDeclaration *pDel = pDoc->NewDeclaration("xml version=\"1.0\" encoding=\"UTF-8\"");

pDoc->LinkEndChild(pDel);

//添加plist节点
XMLElement *plistElement = pDoc->NewElement("plist");
plistElement->SetAttribute("version", "1.0");
pDoc->LinkEndChild(plistElement);

XMLComment *commentElement = pDoc->NewComment("this is xml comment");
plistElement->LinkEndChild(commentElement);

//添加dic节点
XMLElement *dicElement = pDoc->NewElement("dic");
plistElement->LinkEndChild(dicElement);


//添加key节点
XMLElement *keyElement = pDoc->NewElement("key");
keyElement->LinkEndChild(pDoc->NewText("Text"));
dicElement->LinkEndChild(keyElement);

XMLElement *arrayElement = pDoc->NewElement("array");
dicElement->LinkEndChild(arrayElement);

for (int i = 0; i<3; i++) {
    XMLElement *elm = pDoc->NewElement("name");
    elm->LinkEndChild(pDoc->NewText("Cocos2d-x"));
    arrayElement->LinkEndChild(elm);
}

pDoc->SaveFile(filePath.c_str());
pDoc->Print();

delete pDoc;

} ```

  1. 打印结果

Text Cocos2d-x Cocos2d-x Cocos2d-x ```

上面代码使用tinyxml简单生成了一个xml文档。

##解析xml

下面我们就来解析上面创建的xml文档

  1. 引入头文件

    #include "tinyxml2/tinyxml2.h"
using namespace tinyxml2;

  2. xml解析

    
void HelloWorld::parseXML(const char *fileName)
{

std::string filePath = FileUtils::getInstance()->getWritablePath() + fileName;
XMLDocument *pDoc = new XMLDocument();
XMLError errorId = pDoc->LoadFile(filePath.c_str());

if (errorId != 0) {
    //xml格式错误
    return;
}

XMLElement *rootEle = pDoc->RootElement();

//获取第一个节点属性
const XMLAttribute *attribute = rootEle->FirstAttribute();
//打印节点属性名和值
log("attribute_name = %s,attribute_value = %s", attribute->Name(), attribute->Value());

XMLElement *dicEle = rootEle->FirstChildElement("dic");
XMLElement *keyEle = dicEle->FirstChildElement("key");
if (keyEle) {
    log("keyEle Text= %s", keyEle->GetText());
}

XMLElement *arrayEle = keyEle->NextSiblingElement();
XMLElement *childEle = arrayEle->FirstChildElement();
while ( childEle ) {
    log("childEle Text= %s", childEle->GetText());
    childEle = childEle->NextSiblingElement();
}

delete pDoc;

}

    在节点解析过程中，注意对获取到的节点进行判空处理。

  3. 解析结果打印

    cocos2d: attribute_name = version,attribute_value = 1.0
cocos2d: keyEle Text= Text
cocos2d: childEle Text= Cocos2d-x
cocos2d: childEle Text= Cocos2d-x
cocos2d: childEle Text= Cocos2d-x

##小结

上面的简单示例，演示了如何使用tinyxml进行xml文档生成和解析。更多详细的帮助请参考 tinyxml帮助文档http://grinninglizard.com/tinyxml2docs/index.html