rapidjson解析json代码实例以及常见的json core dump问题

rapidjson解析json代码实例

直接看代码：

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									#include <iostream>

									#include <stdio.h>

									#include<unistd.h>

									#include <sys/types.h>

									#include <sys/stat.h>

									#include <fcntl.h>

									#include<sstream>

									// 请自己下载开源的rapidjson

									#include "rapidjson/prettywriter.h"

									#include "rapidjson/rapidjson.h"

									#include "rapidjson/document.h"

									#include "rapidjson/stringbuffer.h"

									#include "rapidjson/writer.h"

									#include "rapidjson/memorystream.h"

									using namespace std;

									using rapidjson::Document;

									using rapidjson::StringBuffer;

									using rapidjson::Writer;

									using namespace rapidjson;

									string getStringFromJson(const string &jsStr, const string &strKey)

									{

									 Document document;

									 if (document.Parse(jsStr.c_str()).HasParseError() || !document.HasMember(strKey.c_str())) 

									 {

									 return "";

									 }

									 const rapidjson::Value &jv = document[strKey.c_str()];

									 return jv.GetString();

									}

									int main(int argc, char *argv[])

									{

									 string s = "{\"code\":0,\"msg\":\"ok\"}";

									 cout << s << endl;

									 cout << getStringFromJson(s, "msg") << endl;

									 return 0;

									}