c++ - 如何在 C++ 中使用 jsoncpp 编写嵌套的 json

Question

{
    "id": "1234567890",
    "seatbid": 
    [
        {
            "bid" : 
            [
                {
                    "id": "1",
                    "crid" : "creative112",
                }
            ],
            "seat" : "512"
        }
    ]
}

我是 C++ 和 Jsoncpp 的新手。我可以使用 jsoncpp 编写普通的 json，但我不能像上面那样编写嵌套的 jason。你能教我如何在 C++ 中使用 jsoncpp 编写嵌套的 json

Answer 1

这是一个简单的解决方案：

#include <json/json.h>
int main()
{   
    Json::Value bid0;
    bid0["id"] = "1";
    bid0["crid"] = "creative112";

    Json::Value bid;
    bid.append(bid0);

    Json::Value seatbid0;
    seatbid0["bid"] = bid;
    seatbid0["seat"] = "512";

    Json::Value seatbid;
    seatbid.append(seatbid0);

    Json::Value root;
    root["id"] = "1234567890";  
    root["seatbid"]=seatbid;

    Json::StyledWriter styledWriter;
    std::cout << styledWriter.write(root);  
}

Answer 2

如果您打算将一个嵌套在另一个内部，例如：

{
   "id" : "1234567890",
   "seatbid" : {
      "bid" : {
         "crid" : "creative112",
         "id" : "1"
      },
      "seat" : "512"
   }
}

以下代码可能是您正在寻找的：

#include <iostream>
#include "JsonCpp/jsoncpp.h"
using namespace std;

class IdCrid : public IJsonSerializable {

public:
    IdCrid() :id(""), crid("") {}

    virtual void Serialize(Json::Value& root) {
        root["id"] = id;
        root["crid"] = crid;
    }

    virtual void Deserialize(Json::Value& root) {
    }
    string id;
    string crid;
};

class SeatBid : public IJsonSerializable {

public:
    SeatBid() :seat("") {}

    virtual void Serialize(Json::Value& root) {
        bid.Serialize(root["bid"]);
        root["seat"] = seat;
    }

    virtual void Deserialize(Json::Value& root) {
    }
    string  seat;
    IdCrid bid;
};


class IdSeatbid : public IJsonSerializable {
public:
    IdSeatbid() :id(""){}

    virtual void Serialize(Json::Value& root) {
        root["id"] = id;
        seatbid.Serialize(root["seatbid"]);
    }

    virtual void Deserialize(Json::Value& root) {
    }
    string id;
    SeatBid seatbid;
};


void printJSON() {
    IdCrid ic;
    ic.id = "1";
    ic.crid = "creative112";

    SeatBid sb;
    sb.bid = ic;
    sb.seat = "512";

    IdSeatbid jp;
    jp.id = "1234567890";
    jp.seatbid = sb;

    string outString = "";
    CJsonSerializer::Serialize(&jp, outString);
    fprintf(stdout, "%s", outString.c_str());
}

int main()
{
    printJSON();
    return 0;
}