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81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
// ArduinoJson - https://arduinojson.org
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// Copyright © 2014-2022, Benoit BLANCHON
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// MIT License
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//
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// This example shows how to deserialize a JSON document with ArduinoJson.
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//
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// https://arduinojson.org/v6/example/parser/
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#include <ArduinoJson.h>
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void setup() {
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// Initialize serial port
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Serial.begin(9600);
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while (!Serial) continue;
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// Allocate the JSON document
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//
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// Inside the brackets, 200 is the capacity of the memory pool in bytes.
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// Don't forget to change this value to match your JSON document.
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// Use https://arduinojson.org/v6/assistant to compute the capacity.
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StaticJsonDocument<200> doc;
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// StaticJsonDocument<N> allocates memory on the stack, it can be
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// replaced by DynamicJsonDocument which allocates in the heap.
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//
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// DynamicJsonDocument doc(200);
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// JSON input string.
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//
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// Using a char[], as shown here, enables the "zero-copy" mode. This mode uses
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// the minimal amount of memory because the JsonDocument stores pointers to
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// the input buffer.
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// If you use another type of input, ArduinoJson must copy the strings from
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// the input to the JsonDocument, so you need to increase the capacity of the
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// JsonDocument.
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char json[] =
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"{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
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// Deserialize the JSON document
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DeserializationError error = deserializeJson(doc, json);
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// Test if parsing succeeds.
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if (error) {
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Serial.print(F("deserializeJson() failed: "));
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Serial.println(error.f_str());
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return;
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}
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// Fetch values.
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//
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// Most of the time, you can rely on the implicit casts.
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// In other case, you can do doc["time"].as<long>();
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const char* sensor = doc["sensor"];
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long time = doc["time"];
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double latitude = doc["data"][0];
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double longitude = doc["data"][1];
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// Print values.
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Serial.println(sensor);
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Serial.println(time);
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Serial.println(latitude, 6);
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Serial.println(longitude, 6);
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}
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void loop() {
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// not used in this example
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}
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// See also
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// --------
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//
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// https://arduinojson.org/ contains the documentation for all the functions
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// used above. It also includes an FAQ that will help you solve any
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// deserialization problem.
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//
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// The book "Mastering ArduinoJson" contains a tutorial on deserialization.
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// It begins with a simple example, like the one above, and then adds more
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// features like deserializing directly from a file or an HTTP request.
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// Learn more at https://arduinojson.org/book/
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// Use the coupon code TWENTY for a 20% discount ❤❤❤❤❤
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