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72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
// ArduinoJson - arduinojson.org
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// Copyright Benoit Blanchon 2014-2019
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// MIT License
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//
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// This example shows how to generate a JSON document with ArduinoJson.
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#include <iostream>
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#include "ArduinoJson.h"
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int main() {
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// Allocate the JSON document
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//
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// Inside the brackets, 300 is the size 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 arduinojson.org/assistant to compute the capacity.
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StaticJsonDocument<300> doc;
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// StaticJsonObject allocates memory on the stack, it can be
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// replaced by DynamicJsonObject which allocates in the heap.
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//
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// DynamicJsonObject doc(200);
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// MessagePack input string.
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//
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// It's better to use a char[] as shown here.
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// If you use a const char* or a String, ArduinoJson will
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// have to make a copy of the input in the JsonBuffer.
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uint8_t input[] = {131, 166, 115, 101, 110, 115, 111, 114, 163, 103, 112, 115,
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164, 116, 105, 109, 101, 206, 80, 147, 50, 248, 164, 100,
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97, 116, 97, 146, 203, 64, 72, 96, 199, 58, 188, 148,
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112, 203, 64, 2, 106, 146, 230, 33, 49, 169};
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// This MessagePack document contains:
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// {
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// "sensor": "gps",
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// "time": 1351824120,
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// "data": [48.75608, 2.302038]
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// }
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// doc of the object tree.
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//
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// It's a reference to the JsonObject, the actual bytes are inside the
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// JsonBuffer with all the other nodes of the object tree.
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// Memory is freed when jsonBuffer goes out of scope.
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DeserializationError error = deserializeMsgPack(doc, input);
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// Test if parsing succeeds.
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if (error) {
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std::cerr << "deserializeMsgPack() failed: " << error.c_str() << std::endl;
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return 1;
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}
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// Get the root object in the document
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JsonObject root = doc.as<JsonObject>();
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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 = root["sensor"];
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long time = root["time"];
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double latitude = root["data"][0];
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double longitude = root["data"][1];
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// Print values.
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std::cout << sensor << std::endl;
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std::cout << time << std::endl;
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std::cout << latitude << std::endl;
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std::cout << longitude << std::endl;
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return 0;
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}
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