c++之json

Posted 2021-03-16 suny5

1.rapidjson 腾讯开源

githup:https://github.com/Tencent/rapidjson

使用文档：http://rapidjson.org/zh-cn/

Installation

RapidJSON is a header-only C++ library. Just copy the include/rapidjson folder to system or project‘s include path.

 

解析json例子

{
    "id": "dd2fb82d-26a5-48d6-abf9-6d8ea7889b3f",
    "imp": [{
        "id": "1963",
        "native": {
            "assets": [{
                "id": 0,
                "required": 1,
                "title": {
                    "len": 50
                }
            }, {
                "id": 1,
                "required": 1,
                "img": {
                    "w": 500,
                    "h": 300,
                    "type": 3
                }
            }, {
                "id": 2,
                "required": 0,
                "data": {
                    "type": 2
                }
            }]
        }
    }],
    "device": {
        "ua": "testua",
        "geo": {
            "lat": 39.99559783935547,
            "lon": 116.40010070800781
        },
        "ip": "58.24.0.17",
        "deviceType": 4,
        "make": "Xiaomi",
        "model": "7 Plus",
        "os": "android",
        "osv": "7.35.3",
        "h": 1136,
        "w": 640,
        "carrier": 1,
        "connectiontype": 2,
        "did": "862224036233396",
        "dpid": "bf908f5a193294f2",
        "mac": "02:00:00:00:00:00"
    }
}

 

#include "rapidjson/document.h"
#include "rapidjson/writer.h"
#include "rapidjson/stringbuffer.h"
#include <iostream>

using namespace rapidjson;
//解析json
int main() {
    // 1. Parse a JSON string into DOM.
    
    const char* json = "{"id":"dd2fb82d-26a5-48d6-abf9-6d8ea7889b3f","imp":[{"id":"1963","native":{"assets":[{"id":0,"required":1,"title":{"len":50}},{"id":1,"required":1,"img":{"w":500,"h":300,"type":3}},{"id":2,"required":0,"data":{"type":2}}]}}],"device":{"ua":"testua","geo":{"lat":39.99559783935547,"lon":116.40010070800781},"ip":"58.24.0.17","deviceType":4,"make":"Xiaomi","model":"7 Plus","os":"Android","osv":"7.35.3","h":1136,"w":640,"carrier":1,"connectiontype":2,"did":"862224036233396","dpid":"bf908f5a193294f2","mac":"02:00:00:00:00:00"}}";
    rapidjson::Document dom;
    if(dom.Parse(json).HasParseError()==0){
        if(dom.HasMember("id") && dom["id"].IsString()){
            std::cout<<"id:"<<dom["id"].GetString()<<std::endl;
        }
        if(dom.HasMember("imp") && dom["imp"].IsArray()){
            const rapidjson::Value& imp = dom["imp"];
            for(int i =0;i<imp.Size();i++){
                if(imp[i].HasMember("id") && imp[i]["id"].IsString()){
                    std::cout<<"id:"<<imp[i]["id"].GetString()<<std::endl;
                }
                if(imp[i].HasMember("native")&& imp[i]["native"].IsObject()){
                    const rapidjson::Value& native = imp[i]["native"];
                    if(native.HasMember("assets")){
                        const rapidjson::Value& assets = native["assets"];
                        for(int i =0;i<assets.Size();i++){
                            const rapidjson::Value& obj = assets[i];
                            std::cout<<"assets:id: "<<obj["id"].GetInt()<<std::endl;
                            std::cout<<"assets:required: "<<obj["required"].GetInt()<<std::endl;
                            if(obj.HasMember("title")){
                                std::cout<<"assets:title:len: "<<obj["title"]["len"].GetInt()<<std::endl;
                            }
                            if(obj.HasMember("img")){
                                std::cout<<"assets:img:w: "<<obj["img"]["w"].GetInt()<<std::endl;
                                std::cout<<"assets:img:h: "<<obj["img"]["h"].GetInt()<<std::endl;
                                std::cout<<"assets:img:type: "<<obj["img"]["type"].GetInt()<<std::endl;
                            }
                            if(obj.HasMember("data")){
                                std::cout<<"assets:data:type: "<<obj["data"]["type"].GetInt()<<std::endl;
                            }
                        }
                    }
                }
            }
        }
        if(dom.HasMember("device")){

            std::cout<<"device:ua: "<<dom["device"]["ua"].GetString()<<std::endl;
            std::cout<<"device:ip: "<<dom["device"]["ip"].GetString()<<std::endl;
            if(dom["device"].HasMember("geo")){
                std::cout<<"device:geo:lat: "<<dom["device"]["geo"]["lat"].GetDouble()<<std::endl;
                std::cout<<"device:geo:lon: "<<dom["device"]["geo"]["lon"].GetDouble()<<std::endl;
            }
            std::cout<<"device:deviceType: "<<dom["device"]["deviceType"].GetInt()<<std::endl;
            std::cout<<"device:make: "<<dom["device"]["make"].GetString()<<std::endl;
            std::cout<<"device:model: "<<dom["device"]["model"].GetString()<<std::endl;
            std::cout<<"device:os: "<<dom["device"]["os"].GetString()<<std::endl;
            std::cout<<"device:osv: "<<dom["device"]["osv"].GetString()<<std::endl;
            std::cout<<"device:h: "<<dom["device"]["h"].GetInt()<<std::endl;
            std::cout<<"device:w: "<<dom["device"]["w"].GetInt()<<std::endl;
            std::cout<<"device:carrier: "<<dom["device"]["carrier"].GetInt()<<std::endl;
            std::cout<<"device:connectiontype: "<<dom["device"]["connectiontype"].GetInt()<<std::endl;
            std::cout<<"device:did: "<<dom["device"]["did"].GetString()<<std::endl;
            std::cout<<"device:dpid: "<<dom["device"]["dpid"].GetString()<<std::endl;
            std::cout<<"device:mac: "<<dom["device"]["mac"].GetString()<<std::endl;
        }
    }
    return 0;
}