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jsonhelpers.h
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jsonhelpers.h
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#pragma once
#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
// parseJSONList parses a JSON list into a vector of concrete types from a byte[]. If any error
// occurs during parsing, an empty vector is returned
template <typename T>
static QList<T> parseJSONList(QByteArray data, T (*dataToItem)(QJsonObject)) {
QJsonParseError err;
QJsonDocument doc = QJsonDocument::fromJson(data, &err);
if (err.error != QJsonParseError::NoError) {
return QList<T>();
}
QJsonArray arr = doc.array();
QList<T> list;
for (const QJsonValue& val : arr) {
auto item = dataToItem(val.toObject());
list.append(item);
}
return list;
}
// parseJSONItem parses a single item (assumed to be a Json Object) from a byte[]. If any error
// occurs during parsing, an empty object is returned.
template <typename T>
static T parseJSONItem(QByteArray data, std::function<T(QJsonObject)>dataToItem) {
QJsonParseError err;
QJsonDocument doc = QJsonDocument::fromJson(data, &err);
if (err.error != QJsonParseError::NoError) {
return T();
}
return dataToItem(doc.object());
}
// Possilbe generic version of converting to json
// template <typename T>
// static QByteArray toJSONObject(T item, QJsonObject(*itemToData)(T)) {
// auto obj = itemToData(item);
// return QJsonDocument::fromVariant(obj).toJson();
//}