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  • Benoît Blanchon
  • ArduinoJson
  • Issues
  • #1191
Closed
Open
Issue created Feb 22, 2020 by Administrator@rootContributor

JsonDocument is not maintaining char[] data in nested scope

Created by: kawinie

StaticJsonDocument<200> doc;
JsonArray array = doc.to<JsonArray>();
{
    JsonObject obj = array.createNestedObject();
    char text[]	   = "Panda Cubs;";
    obj["text"].set(text);
}
serializeJsonPretty(array, Serial);

The above code incorrectly outputs

[
  {
    "text": "(sometimes garbage, other times empty)"
  }
]

Adding an explicit (char *) cast to "text" outputs a correct result.

StaticJsonDocument<200> doc;
JsonArray array = doc.to<JsonArray>();
{
    JsonObject obj = array.createNestedObject();
    char text[]	   = "Panda Cubs;";
    obj["text"].set((char *)text);
}
serializeJsonPretty(array, Serial);
[
  {
    "text": "Panda Cubs"
  }
]

Seems like the problem is that JsonDocument thinks char[] is const char *, in which case the document simply just copy over the pointer.

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