You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
59 lines
1.8 KiB
59 lines
1.8 KiB
// ArduinoJson - https://arduinojson.org
|
|
// Copyright © 2014-2022, Benoit BLANCHON
|
|
// MIT License
|
|
//
|
|
// This example shows how to deserialize a JSON document with ArduinoJson.
|
|
|
|
#include <iostream>
|
|
#include "ArduinoJson.h"
|
|
|
|
int main() {
|
|
// Allocate the JSON document
|
|
//
|
|
// Inside the brackets, 200 is the capacity of the memory pool in bytes.
|
|
// Don't forget to change this value to match your JSON document.
|
|
// Use https://arduinojson.org/v6/assistant to compute the capacity.
|
|
StaticJsonDocument<300> doc;
|
|
|
|
// StaticJsonDocument<N> allocates memory on the stack, it can be
|
|
// replaced by DynamicJsonDocument which allocates in the heap.
|
|
//
|
|
// DynamicJsonDocument doc(200);
|
|
|
|
// JSON input string.
|
|
//
|
|
// Using a char[], as shown here, enables the "zero-copy" mode. This mode uses
|
|
// the minimal amount of memory because the JsonDocument stores pointers to
|
|
// the input buffer.
|
|
// If you use another type of input, ArduinoJson must copy the strings from
|
|
// the input to the JsonDocument, so you need to increase the capacity of the
|
|
// JsonDocument.
|
|
char json[] =
|
|
"{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
|
|
|
|
// Deserialize the JSON document
|
|
DeserializationError error = deserializeJson(doc, json);
|
|
|
|
// Test if parsing succeeds.
|
|
if (error) {
|
|
std::cerr << "deserializeJson() failed: " << error.c_str() << std::endl;
|
|
return 1;
|
|
}
|
|
|
|
// Fetch values.
|
|
//
|
|
// Most of the time, you can rely on the implicit casts.
|
|
// In other case, you can do doc["time"].as<long>();
|
|
const char* sensor = doc["sensor"];
|
|
long time = doc["time"];
|
|
double latitude = doc["data"][0];
|
|
double longitude = doc["data"][1];
|
|
|
|
// Print values.
|
|
std::cout << sensor << std::endl;
|
|
std::cout << time << std::endl;
|
|
std::cout << latitude << std::endl;
|
|
std::cout << longitude << std::endl;
|
|
|
|
return 0;
|
|
}
|
|
|