实习随手记-

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4.    了解JsonCPP

https://sourceforge.net/projects/jsoncpp/

https://github.com/open-source-parsers/jsoncpp

  用JsonCPP解析一个JSON字符串

   用JsonCPP写入一个JSOn字符串

1.    {  

2.        employee :  

3.        {  

4.            firstName: "John",  

5.            lastName : "Doe",  

6.            employeeNumber : 123,  

7.            title : "Accountant"  

8.        }  

9.    }   

 

1.    <employee>  

2.        <firstName>John</firstName>  

3.        <lastName>Doe</lastName>  

4.        <employeeNumber>123</employeeNumber>  

5.        <title>Accountant</title>  

6.    </employee>   

>

/*******************************************************************
json的相关学习:        http://blog.youkuaiyun.com/kxc0720/article/details/48422595#


 一个对象以“{”（左括号）开始，“}”（右括号）结束。
每个“名称”后跟一个“:”（冒号）；名称/值 之间使用“,”（逗号）分隔
employee :
{
firstName:"John",
lastName:"Doe",
employeeNumber:123,
title:"Accountant"
}
*******************************************************************/
#pragma comment(lib, "json_vc71_libmtd.lib")
#include <fstream>
#include <cassert>
#include "json.h"
#include<stdio.h>
#include<iostream>
using namespace std;




void readJson() {
using namespace std;
const char* str = "{\"firstName\": \"John\",\"lastName\": \"Doe\",\"employeeNumber\": 123,\"title\": \"Accountant\"}";




Json::Reader reader;
Json::Value root;


if (reader.parse(str, root))  // reader将Json字符串解析到root，root将包含Json里所有子元素  
{
std::string fname = root["firstName"].asString();  // firstName:"John",  
cout << "firstName: "<<fname << endl;
std::string lname = root["lastName"].asString();  // lastName:"Doe",
cout <<"lastName: "<< lname << endl;
int num = root["employeeNumber"].asInt();  //employeeNumber:123,
cout <<"employeeNumber: "<< num << endl;
std::string tile = root["title"].asString();  // title:"Accountant"
cout << "title:"<<tile << endl;


}
}


void writeJson(){

using namespace std;


Json::Value root;


root["firstName"] = "John";
root["lastName"] = "Doe";
root["employeeNumber"] = 123;
root["title"] = "Accountant";


std::cout <<"================================"<<endl<< root.toStyledString().c_str() << std::endl;


}


int main(int argc, char** argv) {
readJson();
writeJson();
getchar();
return 0;
}