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68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
// Copyright Benoit Blanchon 2014-2017
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// MIT License
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//
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// Arduino JSON library
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// https://github.com/bblanchon/ArduinoJson
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// If you like this project, please add a star!
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#include <ArduinoJson.h>
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void setup() {
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Serial.begin(9600);
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while (!Serial) {
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// wait serial port initialization
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}
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// Memory pool for JSON object tree.
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//
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// Inside the brackets, 200 is the size of the pool in bytes,
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// If the JSON object is more complex, you need to increase that value.
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StaticJsonBuffer<200> jsonBuffer;
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// StaticJsonBuffer allocates memory on the stack, it can be
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// replaced by DynamicJsonBuffer which allocates in the heap.
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// It's simpler but less efficient.
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//
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// DynamicJsonBuffer jsonBuffer;
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// JSON 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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char json[] =
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"{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
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// Root 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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JsonObject& root = jsonBuffer.parseObject(json);
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// Test if parsing succeeds.
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if (!root.success()) {
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Serial.println("parseObject() failed");
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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 root["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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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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