Question

我有这个字段的RoomData类：

#include <string>

class RoomData
{
public:
    int id;
    string name;
    int maxPlayers;
    int timePerQuestion;
    int isActive;
};

并且我试图将RoomData Vector<RoomData>的vactor转换为json数组这就是我的尝试：

#include <nlohmann/json.hpp>

using nlohmann::json;

string serialize(vector<RoomData> roomData)
{
    json j(roomData);
    string jsonArray = j.dump();
    return jsonArray;
}

但它给了我这些错误： C2338 forcing MSVC stacktrace to show which T we're talking about.
C2338 could not find to_json() method in T's namespace
C2065 'force_msvc_stacktrace': undeclared identifier
C2825 'decayed': must be a class or namespace when followed by '::'
C2510 'decayed': left of '::' must be a class/struct/union

Answer 1

我猜你正在使用https://github.com/nlohmann/json。

要使其适用于您的某种类型，您只需提供两个功能：

using nlohmann::json;

void to_json(json& j, const RoomData& r) {
    j = json{
        {"id", r.id}, 
        {"name", r.name}, 
        {"maxPlayers", r.maxPlayers}, 
        {"timePerQuestion", r.timePerQuestion}, 
        {"isActive", r.isActive}
    };
}

void from_json(const json& j, RoomData& r) {
    r.id = j.at("id").get<int>();
    r.name = j.at("name").get<std::string>();
    r.maxPlayers = j.at("maxPlayers").get<int>();
    r.timePerQuestion = j.at("timePerQuestion").get<int>();
    r.isActive = j.at("timePerQuestion").get<int>();
}

然后这将有效。希望这会有所帮助。欢呼声。

Json Serialize Vector <class>到json数组（nlohmann / json.hpp）

1 个答案: