mirror of https://github.com/arendst/Tasmota.git
64 lines
2.0 KiB
C++
64 lines
2.0 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://bblanchon.github.io/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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// About
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// -----
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// This example shows the different ways you can use String with ArduinoJson.
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// Please don't see this as an invitation to use String.
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// On the contrary, you should always use char[] when possible, it's much more
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// efficient in term of code size, speed and memory usage.
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void setup() {
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DynamicJsonBuffer jsonBuffer;
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// You can use a String as your JSON input.
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// WARNING: the content of the String will be duplicated in the JsonBuffer.
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String input =
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"{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
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JsonObject& root = jsonBuffer.parseObject(input);
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// You can use a String to get an element of a JsonObject
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// No duplication is done.
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long time = root[String("time")];
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// You can use a String to set an element of a JsonObject
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// WARNING: the content of the String will be duplicated in the JsonBuffer.
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root[String("time")] = time;
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// You can get a String from a JsonObject or JsonArray:
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// No duplication is done, at least not in the JsonBuffer.
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String sensor = root["sensor"];
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// Unfortunately, the following doesn't work (issue #118):
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// sensor = root["sensor"]; // <- error "ambiguous overload for 'operator='"
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// As a workaround, you need to replace by:
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sensor = root["sensor"].as<String>();
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// You can set a String to a JsonObject or JsonArray:
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// WARNING: the content of the String will be duplicated in the JsonBuffer.
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root["sensor"] = sensor;
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// You can also concatenate strings
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// WARNING: the content of the String will be duplicated in the JsonBuffer.
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root[String("sen") + "sor"] = String("gp") + "s";
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// You can compare the content of a JsonObject with a String
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if (root["sensor"] == sensor) {
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// ...
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}
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// Lastly, you can print the resulting JSON to a String
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String output;
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root.printTo(output);
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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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