how to parse [] empty JSON elements
Closed this issue · 2 comments
MHz000 commented
I'm struggeling parsing a JASON-object received by OpenWeatherMap like this one:
{"coord":{"lon":9.18,"lat":47.66},"weather":[{"id":804,"main":"Clouds","description":"overcast clouds","icon":"04d"}],"base":"stations","main":{"temp":284.22,"feels_like":282.44,"temp_min":283.15,"temp_max":284.82,"pressure":1013,"humidity":93},"visibility":10000,"wind":{"speed":2.6,"deg":50},"clouds":{"all":91},"dt":1591596373,"sys":{"type":1,"id":1310,"country":"DE","sunrise":1591586764,"sunset":1591643939},"timezone":7200,"id":2885679,"name":"Konstanz","cod":200}Access induvidual values I use code like this:
float fTemp = obj["main"]["temp"].as<float>() -273.15; with successHowever the weather element:
"weather":[{"id":804,"main":"Clouds","description":"overcast clouds","icon":"04d"}],is encapsulated in additional [...]
How can I access values for "id", "main", etc? in arduino/c++ idiom?
Trying:
int id = obj["weather"]["0"]["id"].as<int>();
String situation = obj["weather"]["0"]["main"].as<String>();
...compiles fine but give "0" or "null" as result
Thanl you for any advice
MHz000 commented
Thank you for fast replay Benoit!
You're absolutely right😊
Sorry for my delayed answer. There was an internet access blackout. Curious
in this situation I get an "Error compiling source". I love arduino IDE🤔
All the best
MHz000
Am Mo., 8. Juni 2020 um 09:19 Uhr schrieb Benoît Blanchon <
notifications@github.com>:
… Hi @MHz000 <https://github.com/MHz000>
Please try:
int id = obj["weather"][0]["id"];
String situation = obj["weather"][0]["main"];
The result could still be null if deserializeJson()
<https://arduinojson.org/v6/api/json/deserializejson/> fails.
See also:
- Deserialization tutorial
<https://arduinojson.org/v6/doc/deserialization/>
- OpenWeatherMap case study in Mastering ArduinoJson
<https://arduinojson.org/book/>
Best regards,
Benoit
—
You are receiving this because you were mentioned.
Reply to this email directly, view it on GitHub
<#8 (comment)>,
or unsubscribe
<https://github.com/notifications/unsubscribe-auth/AB42SGTTAI4B7N5KVDD5KRLRVSGJ3ANCNFSM4NYBJYYQ>
.
ngxquanganh commented
i got the same error and can't see reply of Benoit, how can you solve this