Cocos2d-x 3.0 JSON Usage cocos2d-x XML parsing

Cocos2d-x 3.0 joins the Rapidjson library for JSON parsing. Located under External/json.

Rapidjson Project Address: http://code.google.com/p/rapidjson/wiki:http://code.google.com/p/rapidjson/wiki/UserGuide

The following is an example code explaining the use of Rapidjson.

Parsing JSON strings using Rapidjson

2. Introducing Header Files

   12	#include "json/rapidjson.h"#include "json/document.h"

3. JSON parsing

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   std::string str = "{\"hello\" : \"word\"}";CCLOG("%s\n", str.c_str());rapidjson::Document d;d.Parse<0>(str.c_str());if (d.HasParseError())  //打印解析错误{    CCLOG("GetParseError %s\n",d.GetParseError());} if (d.IsObject() && d.HasMember("hello")) {    CCLOG("%s\n", d["hello"].GetString());//打印获取hello的值}

5. Print results

   123	cocos2d: {"hello": "word"}cocos2d: word

Note: Only the standard JSON format is supported, and some non-standard JSON formats are not supported.

Some common parsing methods need to be packaged themselves. Be careful to determine if the resolution node exists.

Using Rapidjson to generate JSON strings

2. Introducing Header Files

   1234	#include "json/document.h"#include "json/writer.h"#include "json/stringbuffer.h"usingnamespacerapidjson;

3. Generating a JSON string

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   rapidjson::Document document;document.SetObject();rapidjson::Document::AllocatorType& allocator = document.GetAllocator();rapidjson::Value array(rapidjson::kArrayType);rapidjson::Value object(rapidjson::kObjectType);object.AddMember("int", 1, allocator);object.AddMember("double", 1.0, allocator);object.AddMember("bool", true, allocator);object.AddMember("hello", "你好", allocator);array.PushBack(object, allocator);document.AddMember("json", "json string", allocator);document.AddMember("array", array, allocator);StringBuffer buffer;rapidjson::Writer<StringBuffer> writer(buffer);document.Accept(writer);CCLOG("%s",buffer.GetString());

4. Print results

   1	cocos2d: {"json":"json string","array":[{"int":1,"double":1,"bool":true

   Cocos2d-x has added tinyxml2 parsing for XML. Version 3.0 is located external/tinyxml2 under. The 2.x version is located cocos2dx/support/tinyxml2 under.

   TINYXML2 GitHub Address: HTTPS://GITHUB.COM/LEETHOMASON/TINYXML2

   Help document Address: http://grinninglizard.com/tinyxml2docs/index.html

   Generating an XML document
   2. Introducing Header Files

      12	#include "tinyxml2/tinyxml2.h"usingnamespacetinyxml2;

   3. XML document Generation

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      voidHelloWorld::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;}

   4. Print results

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      <?xml version="1.0" encoding="UTF-8"?><plist version="1.0"><!--this is xml comment--><dic>    <key>Text</key>    <array>        <name>Cocos2d-x</name>        <name>Cocos2d-x</name>        <name>Cocos2d-x</name>    </array></dic></plist>

   The above code uses TinyXML to simply generate an XML document.

   Parsing xml

   Here we will parse the XML document created above

   2. Introducing Header Files

      12	#include "tinyxml2/tinyxml2.h"usingnamespacetinyxml2;

   3. XML parsing

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      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;}

      In the process of node parsing, pay attention to the empty processing of the obtained node.

   5. Parsing results Printing

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      cocos2d: attribute_name = version,attribute_value = 1.0cocos2d: keyEle Text= Textcocos2d: childEle Text= Cocos2d-xcocos2d: childEle Text= Cocos2d-xcocos2d: childEle Text= Cocos2d-x

   Summary

   The simple example above demonstrates how to use TinyXML for XML document generation and parsing. For more detailed help, please refer to the TinyXML Help documentation http://grinninglizard.com/tinyxml2docs/index.html

Cocos2d-x 3.0 JSON Usage cocos2d-x XML parsing