从 JSON 数组获取天气

Getting weather from JSON array

本文关键字:获取 数组 JSON      更新时间:2023-10-16

我对 c++ 非常陌生,我正在尝试使用 jsoncpp 从数组中获取天气。

json 字符串如下所示:

{"coord":{"lon":139,"lat":35},
"sys":{"country":"JP","sunrise":1369769524,"sunset":1369821049},
"weather":[{"id":804,"main":"clouds","description":"overcast clouds","icon":"04n"}],
"main":{"temp":289.5,"humidity":89,"pressure":1013,"temp_min":287.04,"temp_max":292.04},
"wind":{"speed":7.31,"deg":187.002},
"rain":{"3h":0},
"clouds":{"all":92},
"dt":1369824698,
"id":1851632,
"name":"Shuzenji",
"cod":200}

解析 json 数组工作正常,这是相关代码:

Json::Value root;   
Json::Reader reader;
bool parsingSuccessful = reader.parse( data.c_str(), root );
if ( !parsingSuccessful )
{
    std::cout  << "Failed to parse"
    << reader.getFormattedErrorMessages();
    return 0;
}
std::cout << root.get("description", "n/a" ).asString() << std::endl;

但我最终还是n/a. 我希望能够访问"天气"数组中的"描述"字段。 我该怎么做?

这行得通吗?

const Json::Value weather = root["weather"];
for ( int index = 0; index < weather.size(); ++index )
{
    std::cout << weather[index]["description"].asString();
}