cocos2dx 读取json及解析

ball.json 数据如下：

{
"entities": [
{
"entity": {
"TapOpposite": 0,
"Interval": 0.95,
"BallNum": 1
}
},
{
"entity": {
"TapOpposite": 0,
"Interval": 0.91,
"BallNum": 2
}
},
{
"entity": {
"TapOpposite": 0,
"Interval": 0.95,
"BallNum": 3
}
}
]
}

在cocos2dx中json的读取是用的rapidjson,包含在cocostudio工程中。所以我们要先引入#include "cocostudio/CocoStudio.h"

void GameWorld::readJson()
{
//json 文档
rapidjson::Document _doc;
bool bRet = false;
ssize_t size = 0;
unsigned char *pBytes = NULL;
do {
pBytes = cocos2d::CCFileUtils::sharedFileUtils()->getFileData("ball.json", "r", &size);
CC_BREAK_IF(pBytes == NULL || strcmp((char*)pBytes, "") == 0);
std::string load_str((const char*)pBytes, size);
CC_SAFE_DELETE_ARRAY(pBytes);
_doc.Parse<0>(load_str.c_str());
CC_BREAK_IF(_doc.HasParseError());
//生成json文档对像

if(!_doc.IsObject())
return;

//是否有此成员
if(!_doc.HasMember("entities"))
return;

// 通过[]取成员值,再根据需要转为array,int,double,string
const rapidjson::Value &pArray = _doc["entities"];

//是否是数组
if(!pArray.IsArray())
return;

for (rapidjson::SizeType i = 0; i < pArray.Size(); i++)
{
const rapidjson::Value &p = pArray[i];
if(p.HasMember("entity"))
{
const rapidjson::Value &valueEnt = p["entity"];
if(valueEnt.HasMember("TapOpposite") && valueEnt.HasMember("Interval") && valueEnt.HasMember("BallNum"))
{
const rapidjson::Value &tapOpposite = valueEnt["TapOpposite"];
int tapOp = tapOpposite.GetInt();      //得到int值

const rapidjson::Value &interval = valueEnt["Interval"];
float inter = interval.GetDouble();  //得到float,double值

const rapidjson::Value &ballNum = valueEnt["BallNum"];
int ball = ballNum.GetInt();      //得到int值

ballParam param;
param.tapOp = tapOp;
param.inter = inter;
param.ballIndex = ball;
m_ballParamVec.push_back(param);
}
}
else
{
return;
}

}
bRet = true;

} while (0);
}