Description
Hi again,
I'm experiencing trouble deserialising floating point values. If I am serialising values bigger than 1000 they get encoded in the "1.0e3" notation, but if I read them from the serialised json, it ignores the exponent and reads it as 1.0.
See this example code, 11000.13465 gets serialised to 1.100013e4 but read back as 1.100013:
#include <ArduinoJson.h>
void setup()
{
}
float value = 11000.13465;
void readJson(String json){
const size_t BUFFER_SIZE = JSON_OBJECT_SIZE(1) + 190;
StaticJsonBuffer<BUFFER_SIZE> jsonBuffer;
JsonObject& root = jsonBuffer.parseObject(json);
if (!root.success())
{
Serial.println("parseObject() failed ");
Serial.println(jsonBuffer.size());
Serial.println(root.success());
return;
}
if(root.containsKey("value")){
value = root["value"].as<float>();
}else{
Serial.println("this should never happen");
}
Serial.println("value: " + String(value));
}
String serializeValues(){
const size_t bufferSize = JSON_OBJECT_SIZE(1) + 190;
StaticJsonBuffer<bufferSize> jsonBuffer;
JsonObject& root = jsonBuffer.createObject();
root["value"] = double_with_n_digits(value,6);
String json;
root.printTo(json);
Serial.println(json);
return json;
}
void loop()
{
readJson(serializeValues());
delay(2000);
}
Program output:
{"value":1.100013e4}
value: 1.10
Expected would have been
value: 11000.13
It doesn't matter whether I use as() or not. I'm running this on an esp8266-12F using platformIo and the arduino esp8266 SDK
Any help is much appreciated
Cheers
Max