{"face":[{"attribute":{"age":27,"gender":"Male","lefteye_opendegree":43,"mouth_opendegree":2,"pose":{"raise":-21,"tilting":-2,"turn":4},"righteye_opendegree":47},"face_id":"83e3edac3d5d49579089d3ee043d41ec","position":{"center":{"x":179,"y":50},"eye_left":{"x":206,"y":78},"eye_right":{"x":248,"y":78},"height":94,"width":94},"tag":""}],"img_height":500,"img_id":"030-3aff983ea4ea5a35f89ae6","img_width":350,"res_code":"0000","url":"http://e.hiphotos.baidu.com/baike/pic/item/9345d688d43f879428d347b3d81b0ef41bd53a7a.jpg"
}

#include <iostream>
#include <fstream>
#include "jsoncpp/json.h"
int main()
{using namespace std;using namespace Json;ifstream ifs("json_text.txt");if (ifs){string line, jsonStr;while (getline(ifs, line))jsonStr.append(line);CharReader *reader = CharReaderBuilder().newCharReader();Value root;JSONCPP_STRING errs;if (reader->parse(jsonStr.c_str(), jsonStr.c_str() + jsonStr.size(), &root, &errs)){auto faceId = root["face"][0]["face_id"].asString();auto imgWidth = root["img_width"].asInt();auto imgHeight = root["img_height"].asInt();auto resCode = root["res_code"].asString();auto url = root["url"].asString();cout << "face_id:\t" << faceId << endl;cout << "img_width:\t" << imgWidth << endl;cout << "img_height:\t" << imgHeight << endl;cout << "res_code:\t" << resCode << endl;cout << "url:\t\t" << url << endl;}elsecout << errs << endl;delete reader;}return 0;
}

#include <iostream>
#include <memory>
#include "jsoncpp/json.h"
int main()
{std::unique_ptr<Json::StreamWriter> writer(Json::StreamWriterBuilder().newStreamWriter());Json::Value array, element;element["face_id"] = "a9cebf8d5ae6fff514d8d2d8e07fa55b";element["similarity"] = 100;element["img_id"] = "12.jpg";element["people_name"] = "张艺谋";array["result"].append(element);element["face_id"] = "7f2de0e85bede3171c839d0dcabd849f";element["similarity"] = 55.379097;element["img_id"] = "6.jpg";element["people_name"] = "曾国藩";array["result"].append(element);element["face_id"] = "40ebb31e8af7237a73dec9f242885a7e";element["similarity"] = 52.59766;element["img_id"] = "2.jpg";element["people_name"] = "测试";array["result"].append(element);//std::ostringstream ss;if (writer->write(array, &std::cout))std::cout << "write failed" << std::endl;elsestd::cout << std::endl;return 0;
}

g++ -std=c++11 jsoncpp_parse_test.cpp jsoncpp/jsoncpp.cpp -o jsoncpp_parse_test
g++ -std=c++11 jsoncpp_generate_test.cpp jsoncpp/jsoncpp.cpp -o jsoncpp_generate_test