All/C_CPP/IntellegentGate/inc/items.cpp

#include "items.h"

namespace hm {
    std::string User::getJsonStr() {
        /* 13: timestamp: 2023-1-1_0:0:0=>1672502400000, 2100-1-1_0:0:0=>4102416000000
         * 47: {"uid":"","name":"","password":"","timestamp":}
         * */
        size_t size = uid.size() + name.size() + password.size() + 60;
        std::string res(size, 0);
        sprintf(
                res.data(), R"({"uid":"%s","name":"%s","password":"%s","timestamp":%ld})",
                uid.c_str(), name.c_str(), password.c_str(), timestamp
        );
        return res;
    }

    std::string Plate::getJsonStr() {
        /* 13: timestamp: 2023-1-1_0:0:0=>1672502400000, 2100-1-1_0:0:0=>4102416000000
         * 42: {"cid":,"name":"","plate":"","timestamp":}
         * */
        size_t size = cid_s.size() + name.size() + plate.size() + 55;
        std::string res(size, 0);
        sprintf(
                res.data(), R"({"cid":%d,"name":"%s","plate":"%s","timestamp":%ld})",
                cid, name.c_str(), plate.c_str(), timestamp
        );
        return res;
    }
}