Changing the value of a key in an object

[ferchinas]

Hello again: I have my configuration file in the file system of esp8266. What is the best way to replace a value of a key? I am trying this way but and work fine, but I have problems with numbers greater than 255 when the previous value was less.

And I do not find that I'm doing wrong. There is enough space in the json buffer.

oldValue =  jsonObject[key];  // value = 0
newValue = 500;

if (jsonObject.containsKey(key)) {

    jsonObject.remove(key);            //  I tried with and without this line       

    if (!jsonObject.set(key, newValue )) // this pass ok, but it does not update the value
        return (ERROR);

    if (newValue != jsonObject[key])     //here i detect the error, 
        return (ERROR);
}   

[bblanchon]

Hi @ferchinas,

Here is an online demo: https://wandbox.org/permlink/LYkuILoDnrxPD0wK

The issue is probably somewhere else in the program. Look for type overflow (btw what is the type of newValue?) or undefined behavior (such as destructed buffers).

Regards, Benoit

[ferchinas]

Hi @bblanchon

Muchas gracias por la respuesta y gracias a Wandbox (no lo conocia) encontre el error. De a poco voy descubriendo la enorme potencia de ArduinoJson

Regards, Fernando