How can I use a Struct to return JsonArray from a function ? #610
Description
Thank you for your library
I'm trying to bring data from json files, repeteadly. To do so, I want to build a function which receive a file name and return a Struct, with a jsonArray among others
At jsonStruct, if I not declare puntos as reference, receive this error message: use of deleted function 'jsonStruct::jsonStruct()', which leads me to #290, but this conversation surpases my knowledge
if I declare puntos (inside struct) as reference, I receive error message: error: invalid conversion from 'ArduinoJson::Internals::JsonVariantAs<char*>::type {aka const char*}' to 'char*' [-fpermissive]
return as();
So my question is how can I use a Struct to return JsonArray from a function ?, thank you in advance
//the struct declared globally
struct jsonStruct {
char *nombre;
char *titulo;
char *descripcion;
JsonArray *puntos;//<-- not declared as reference leads me to #290
};
//Then I call the function from here
void handleLista(AsyncWebServerRequest *request){
jsonStruct jsonData;
jsonData = traeJsonFile("/lista-pares-biomagneticos.json");
request->send(200, "text/html", jsonData.nombre);
}
//and the function to be called many times (for each file)
jsonStruct traeJsonFile(char *fileName){
File file = SPIFFS.open(fileName, "r");
jsonStruct fileData;
if(file){
size_t size = file.size();
std::unique_ptr<char[]> buf (new char[size]);
file.readBytes(buf.get(), size);
JsonObject& root = jsonBuffer.parseObject(buf.get());
if (root.success()) {
fileData.nombre = root["nombre"];//<-- error is generated here
//fileData.nombre = "test";//<-- no error
.
.
.I should continue populating fileData with JsonArray and others
}
}
return fileData;
}
EDIT
sorry me by huge delay()
I've tried your code but received error at first try ... didn't have the time to try some variants ... sorry me