使用rapidjson解析json串

1. 引入头文件

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

2. json解析

   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
   }

3. 打印结果

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

注意：只支持标准的json格式，一些非标准的json格式不支持。

一些常用的解析方法需要自己封装。注意判断解析节点是否存在。

使用rapidjson生成json串

1. 引入头文件

   #include "json/document.h"
   #include "json/writer.h"
   #include "json/stringbuffer.h"
   using namespace  rapidjson;

2. 生成json串

   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());

3. 打印结果

   cocos2d: {"json":"json string","array":[{"int":1,"double":1,"bool":true,"hello":"你好"}]}