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Simplify ProgmemExample.ino and StringExample.ino

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This commit is contained in:
Benoit Blanchon
2022-07-07 14:32:41 +02:00
parent 58c7c919f2
commit 04872b6db8
2 changed files with 23 additions and 24 deletions
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19
examples/ProgmemExample/ProgmemExample.ino
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@@ -20,28 +20,27 @@ void setup() {
// WARNING: the strings in the input will be duplicated in the JsonDocument.
deserializeJson(doc, F("{\"sensor\":\"gps\",\"time\":1351824120,"
"\"data\":[48.756080,2.302038]}"));
JsonObject obj = doc.as<JsonObject>();
// You can use a Flash String to get an element of a JsonObject
// You can use a Flash String as a key to get a member from JsonDocument
// No duplication is done.
long time = obj[F("time")];
long time = doc[F("time")];
// You can use a Flash String to set an element of a JsonObject
// You can use a Flash String as a key to set a member of a JsonDocument
// WARNING: the content of the Flash String will be duplicated in the
// JsonDocument.
obj[F("time")] = time;
doc[F("time")] = time;
// You can set a Flash String to a JsonObject or JsonArray:
// You can set a Flash String as the content of a JsonVariant
// WARNING: the content of the Flash String will be duplicated in the
// JsonDocument.
obj["sensor"] = F("gps");
doc["sensor"] = F("gps");
// It works with serialized() too:
obj["sensor"] = serialized(F("\"gps\""));
obj["sensor"] = serialized(F("\xA3gps"), 3);
doc["sensor"] = serialized(F("\"gps\""));
doc["sensor"] = serialized(F("\xA3gps"), 3);
// You can compare the content of a JsonVariant to a Flash String
if (obj["sensor"] == F("gps")) {
if (doc["sensor"] == F("gps")) {
// ...
}
}

28
examples/StringExample/StringExample.ino
View File

@@ -20,42 +20,42 @@ void setup() {
String input =
"{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
deserializeJson(doc, input);
JsonObject obj = doc.as<JsonObject>();
// You can use a String to get an element of a JsonObject
// You can use a String as a key to get a member from JsonDocument
// No duplication is done.
long time = obj[String("time")];
long time = doc[String("time")];
// You can use a String to set an element of a JsonObject
// You can use a String as a key to set a member of a JsonDocument
// WARNING: the content of the String will be duplicated in the JsonDocument.
obj[String("time")] = time;
doc[String("time")] = time;
// You can get a String from a JsonObject or JsonArray:
// You can get the content of a JsonVariant as a String
// No duplication is done, at least not in the JsonDocument.
String sensor = obj["sensor"];
String sensor = doc["sensor"];
// Unfortunately, the following doesn't work (issue #118):
// sensor = obj["sensor"]; // <- error "ambiguous overload for 'operator='"
// sensor = doc["sensor"]; // <- error "ambiguous overload for 'operator='"
// As a workaround, you need to replace by:
sensor = obj["sensor"].as<String>();
sensor = doc["sensor"].as<String>();
// You can set a String to a JsonObject or JsonArray:
// You can set a String as the content of a JsonVariant
// WARNING: the content of the String will be duplicated in the JsonDocument.
obj["sensor"] = sensor;
doc["sensor"] = sensor;
// It works with serialized() too:
obj["sensor"] = serialized(sensor);
doc["sensor"] = serialized(sensor);
// You can also concatenate strings
// WARNING: the content of the String will be duplicated in the JsonDocument.
obj[String("sen") + "sor"] = String("gp") + "s";
doc[String("sen") + "sor"] = String("gp") + "s";
// You can compare the content of a JsonObject with a String
if (obj["sensor"] == sensor) {
if (doc["sensor"] == sensor) {
// ...
}
// Lastly, you can print the resulting JSON to a String
// WARNING: it doesn't replace the content but appends to it
String output;
serializeJson(doc, output);
}