const char* str = "{\"name\":\"xiaoming\",\"age\":18}";

    Json::Value root;

    Json::Reader reader;

    if (!reader.parse(str, root))

    {

        cout << "Parse from str failed\n";

        return;

    }  

    string name = root["name"].asCString();

    int age = root["age"].asInt();

    std::cout << "name: " << name << "  age:" << age;  

    Json::CharReaderBuilder b;

    Json::CharReader* reader(b.newCharReader());

    Json::Value root;

    JSONCPP_STRING errs;

    bool ok = reader->parse(str, str + std::strlen(str), &root, &errs);

    if (ok&&errs.size() == )

    {

        std::string upload_id = root["uploadid"].asString();  // 访问节点，upload_id = "UP000000"

        int code = root["code"].asInt();    // 访问节点，code = 100

    }

    delete reader;