CODEWITHSUNDEEP
c++jsonqtqt-creator
Raffaele Rossi
Raffaele Rossi

Reputation: 3127

C++ Qt unable to parse JSON array correctly

I am trying to parse json with Qt but I have no success. This is the ouput that I get from the server:

[{"anni":2019},{"anni":2018},{"anni":2017}]

Where that's generated from this simple php:

header('Content-Type: application/json');
echo json_encode($data);

The $data is an array containing the values you see above. I am using this piece of code in Qt 5.11.2:

void MainWindow::showYears() {   

    //reply is a QNetworkReply* reply;
    if (reply->error() != QNetworkReply::NoError) {
        //some error managment
    } else {

        auto responsedata = reply->readAll();

        QJsonArray years = QJsonDocument::fromJson(responsedata).array();          
        qDebug() << QString{responsedata};

        for(const QJsonValue& y : years) {
            QJsonObject obj = y.toObject();

            //doing "qDebug() << r" shows that r is "" (empty!)
            auto r = obj["anni"].toString();

            ui->comboBoxP->addItem(r);
        }

    }

}

What's wrong here?

Please note that qDebug() << QString{responsedata}; prints "[{\"anni\":2019},{\"anni\":2018},{\"anni\":2017}]"

Upvotes: 1

Views: 370

Answers (1)

Tezirg
Tezirg

Reputation: 1639

The value for your field anni is an integer. Using the member function toString will not convert it to a string representation. it will return NULL. http://doc.qt.io/qt-5/qjsonvalue.html#toString

Try with: auto r = QString::number(obj["anni"].toInt());

Upvotes: 6

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