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JsonVariant automatically promotes to JsonObject or JsonArray on write

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Benoit Blanchon
2019-01-29 14:09:09 +01:00
parent 5aea1363cc
commit 6f55d1e58f
53 changed files with 1197 additions and 541 deletions
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12
examples/StringExample/StringExample.ino
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@@ -5,7 +5,7 @@
// This example shows the different ways you can use String with ArduinoJson.
//
// Use String objects sparingly, because ArduinoJson duplicates them in the
// JsonBuffer. Prefer plain old char[], as they are more efficient in term of
// JsonDocument. Prefer plain old char[], as they are more efficient in term of
// code size, speed, and memory usage.
#include <ArduinoJson.h>
@@ -14,7 +14,7 @@ void setup() {
DynamicJsonDocument doc(1024);
// You can use a String as your JSON input.
// WARNING: the content of the String will be duplicated in the JsonBuffer.
// WARNING: the string in the input will be duplicated in the JsonDocument.
String input =
"{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
deserializeJson(doc, input);
@@ -25,11 +25,11 @@ void setup() {
long time = obj[String("time")];
// You can use a String to set an element of a JsonObject
// WARNING: the content of the String will be duplicated in the JsonBuffer.
// WARNING: the content of the String will be duplicated in the JsonDocument.
obj[String("time")] = time;
// You can get a String from a JsonObject or JsonArray:
// No duplication is done, at least not in the JsonBuffer.
// No duplication is done, at least not in the JsonDocument.
String sensor = obj["sensor"];
// Unfortunately, the following doesn't work (issue #118):
@@ -38,14 +38,14 @@ void setup() {
sensor = obj["sensor"].as<String>();
// You can set a String to a JsonObject or JsonArray:
// WARNING: the content of the String will be duplicated in the JsonBuffer.
// WARNING: the content of the String will be duplicated in the JsonDocument.
obj["sensor"] = sensor;
// It works with serialized() too:
obj["sensor"] = serialized(sensor);
// You can also concatenate strings
// WARNING: the content of the String will be duplicated in the JsonBuffer.
// WARNING: the content of the String will be duplicated in the JsonDocument.
obj[String("sen") + "sor"] = String("gp") + "s";
// You can compare the content of a JsonObject with a String