How to process json array with QJsonxxx?

[dscyw]

Assuming that jsonStr is a QString variable whose value is [{"groupId":"121","description":"0213test1","name":"0213test1"}, {"groupId":"122","description":"0213test2","name":"0213test2"}].

How can I process it with QJsonxxx class as jsonStr being its input?

I have a workaround as the following code snippet shows:

//_groupServiceInfoMap is a map of QMap<int, GroupServiceInfo>;
// the definition  of GroupServiceInfo  is omitted here;
QString jsonStr2 = jsonStr.mid(1, jsonStr.length() - 2);

	foreach (QString item, jsonStr2.split("},{"))
	{
		GroupServiceInfo info;

		item.remove("{");
		item.remove("}");
		item = "{" + item + "}";
		QJsonParseError json_error;
		QJsonDocument doucment = QJsonDocument::fromJson(item.toUtf8(), &json_error);
		if (json_error.error == QJsonParseError::NoError)
		{
			if (!(doucment.isNull() || doucment.isEmpty()))
			{
				QVariantMap m = doucment.toVariant().toMap();
				if (m.contains("groupId")) {
					info.id = m["groupId"].toInt();
				}
				if (m.contains("description")) {
					info.desc = m["description"].toString();
				}
				if (m.contains("name")) {
					info.name = m["name"].toString();
				}
				_groupServiceInfoMap.insert(info.id, info);
			}
		}
	}

[sierdzio]

Here's an example of how to handle a JSON array https://github.com/sierdzio/stimeline/blob/master/src/stagsmodel.cpp#L42

[VRonin]

Maybe I'm being stupid, can't you just use QJsonArray?

const QString jsonString(R"**([{"groupId":"121","description":"0213test1","name":"0213test1"}, {"groupId":"122","description":"0213test2","name":"0213test2"}])**");
const QJsonDocument doucment = QJsonDocument::fromJson(jsonString);
Q_ASSERT(doucment.isArray());
const QJsonArray documentArray = doucment.array();
for(const QJsonValue& jVal : documentArray){
qDebug() << jVal["groupId"].toInt() << jVal["description"].toString() << jVal["name"].toString();
}

[dscyw]

@sierdzio Thx. My final solution is as follow:

 //_groupServiceInfoMap is a map of QMap<int, GroupServiceInfo>;
        // the definition  of GroupServiceInfo  is omitted here;
        const QJsonDocument doucment = QJsonDocument::fromJson(jsonStr.toUtf8());
	Q_ASSERT(doucment.isArray());
	const QJsonArray documentArray = doucment.array();
	GroupServiceInfo info;
	for (const QJsonValue &i : documentArray) {
		const QJsonObject obj(i.toObject());
		QVariantMap m = obj.toVariantMap();
		if (m.contains("groupId")) {
			info.id = m["groupId"].toInt();
		}
		if (m.contains("description")) {
			info.desc = m["description"].toString();
		}
		if (m.contains("name")) {
			info.name = m["name"].toString();
		}
		_groupServiceInfoMap.insert(info.id, info);
	}

[dscyw]

jVal["groupId"] doesn't compile.

@VRonin said in How to process json array with QJsonxxx?:

Maybe I'm being stupid, can't you just use QJsonArray?

const QString jsonString(R"**([{"groupId":"121","description":"0213test1","name":"0213test1"}, {"groupId":"122","description":"0213test2","name":"0213test2"}])**");
const QJsonDocument doucment = QJsonDocument::fromJson(jsonString);
Q_ASSERT(doucment.isArray());
const QJsonArray documentArray = doucment.array();
for(const QJsonValue& jVal : documentArray){
qDebug() << jVal["groupId"].toInt() << jVal["description"].toString() << jVal["name"].toString();
}

[VRonin]

@dscyw said in How to process json array with QJsonxxx?:

jVal["groupId"] doesn't compile.

Correct, sorry, it's jVal.toJsonObject().value("groupId")