QJsonObject not working right? cannot debug?

Gibbz

I'm trying to load a json file, and apply the data to my QJsonArray. But I first need to use a QJsonObject and use that to get my array. I'm not having much luck debugging the QJsonObject always shows it has 6 items that are inaccessible, but log to console fine... But then don't output into the array...
Any ideas why this is not working?
My code bellow:

    QFile file(":/stations.json");
    file.open(QIODevice::ReadOnly | QIODevice::Text);
    QByteArray file_data = file.readAll();
    file.close();

    QJsonParseError JsonParseError;
    QJsonDocument doc = QJsonDocument::fromJson(file_data, &JsonParseError);
    QJsonObject obj = doc.object();
    QJsonArray stations = obj["stations"].toArray();

    // debug
    QString jsonString = doc.toJson(QJsonDocument::Indented);
    QString strFromObj = QJsonDocument(obj).toJson(QJsonDocument::Compact).toStdString().c_str();
    qDebug() << strFromObj;

And a sample json:

{
    "stations" : [
        ["94648", "IDS60801", "SA", "Adelaide (West Terrace /  ngayirdapira)", "-34.9", "138.6"],
        ["94675", "IDS60801", "SA", "Adelaide (Kent Town)", "-34.9", "138.6"]
    ]
}

Gibbz

looks like it is actually working! It just not possible to debug this except through qDebug messages.

JKSH

Your code doesn't do anything with JsonParseError or stations. Your debug code doesn't do anything with jsonString.

What do you get when you call this?:

qDebug() << JsonParseError.errorString();
qDebug() << stations;

Gibbz

looks like it is actually working! It just not possible to debug this except through qDebug messages.

JKSH

@Gibbz said in QJsonObject not working right? cannot debug?:

It just not possible to debug this except through qDebug messages.

You can debug it however you want. I prefer qDebug() because its interface is a lot nicer; you can pass a QJsonDocument or QJsonObject or QJsonArray straight in:

QJsonDocument doc = QJsonDocument::fromJson(file_data, &JsonParseError);
QJsonObject obj = doc.object();
QJsonArray stations = obj["stations"].toArray();

qDebug() << doc;
qDebug() << obj;
qDebug() << stations;

QString strFromObj = QJsonDocument(obj).toJson(QJsonDocument::Compact).toStdString().c_str();
qDebug() << strFromObj;

It doesn't make sense to convert everything to a C String and then back to a QString.

You can implicitly convert a QByteArray directly to a QString...

QString strFromObj = QJsonDocument(obj).toJson(QJsonDocument::Compact);

...or you can debug using std::string and std::cout:
``
std::cout << QJsonDocument(obj).toJson(QJsonDocument::Compact).toStdString();