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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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33
examples/MsgPackParser/MsgPackParser.ino
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@ -14,9 +14,9 @@ void setup() {
// Allocate the JSON document
//
// Inside the brackets, 200 is the size of the memory pool in bytes.
// Inside the brackets, 200 is the capacity of the memory pool in bytes.
// Don't forget to change this value to match your JSON document.
// Use arduinojson.org/assistant to compute the capacity.
// Use arduinojson.org/v6/assistant to compute the capacity.
StaticJsonDocument<200> doc;
// StaticJsonObject allocates memory on the stack, it can be
@ -26,9 +26,12 @@ void setup() {
// MessagePack input string.
//
// It's better to use a char[] as shown here.
// If you use a const char* or a String, ArduinoJson will
// have to make a copy of the input in the JsonBuffer.
// Using a char[], as shown here, enables the "zero-copy" mode. This mode uses
// the minimal amount of memory because the JsonDocument stores pointers to
// the input buffer.
// If you use another type of input, ArduinoJson must copy the strings from
// the input to the JsonDocument, so you need to increase the capacity of the
// JsonDocument.
uint8_t input[] = {131, 166, 115, 101, 110, 115, 111, 114, 163, 103, 112, 115,
164, 116, 105, 109, 101, 206, 80, 147, 50, 248, 164, 100,
97, 116, 97, 146, 203, 64, 72, 96, 199, 58, 188, 148,
@ -40,31 +43,23 @@ void setup() {
// "data": [48.75608, 2.302038]
// }
// doc of the object tree.
//
// It's a reference to the JsonObject, the actual bytes are inside the
// JsonBuffer with all the other nodes of the object tree.
// Memory is freed when jsonBuffer goes out of scope.
DeserializationError error = deserializeMsgPack(doc, input);
// Test if parsing succeeds.
// Test if parsing succeeded.
if (error) {
Serial.print("deserializeMsgPack() failed: ");
Serial.println(error.c_str());
return;
}
// Get the root object in the document
JsonObject root = doc.as<JsonObject>();
// Fetch values.
//
// Most of the time, you can rely on the implicit casts.
// In other case, you can do root["time"].as<long>();
const char* sensor = root["sensor"];
long time = root["time"];
double latitude = root["data"][0];
double longitude = root["data"][1];
// In other case, you can do doc["time"].as<long>();
const char* sensor = doc["sensor"];
long time = doc["time"];
double latitude = doc["data"][0];
double longitude = doc["data"][1];
// Print values.
Serial.println(sensor);