ArduinoJSON：如何修复打印 1 或 0 而不是 true/false

arduinojson_boolean_issue.cpp

volatile bool value = true;

DynamicJsonDocument json(1024);
json["ok"] = value;
serializeJson(json, Serial);

volatile bool value = true;

DynamicJsonDocument json(1024);
json["ok"] = value;
serializeJson(json, Serial);

由于 value 被声明为 volatile，这将打印 {"ok": 1} 而不是 {"ok": true}（仅使用 bool value 时有效，使用 volatile bool value 时无效）。

为了强制 {"ok": true}，只需将 value 转换为 bool：

arduinojson_boolean_cast.cpp

json["ok"] = (bool)value;

json["ok"] = (bool)value;

arduinojson_full_example.cpp

volatile bool value = true;

DynamicJsonDocument json(1024);
json["ok"] = (bool)value;
serializeJson(json, Serial);

volatile bool value = true;

DynamicJsonDocument json(1024);
json["ok"] = (bool)value;
serializeJson(json, Serial);

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