Converting QJsonObject to QVariantMap gives empty map



  • Hi All,

    I'm trying to read some JSON file and convert it into QVariantMap. For this I use QJsonDocument.
    The file is read fine and JSON parsing doesn't give any error but for some reason when I convert this into QVariantMap it is empty.

    Please take a look at the code below:

        QString fileNameTemplate("/tmp/%1.json");
        QString fileName = fileNameTemplate.arg("file");
    
        qDebug() << Q_FUNC_INFO << "Reading from file: " << fileName;
    
        QFile jsonFile;
        jsonFile.setFileName(fileName);
    
        if(!jsonFile.open(QIODevice::ReadOnly | QIODevice::Text))
        {
            qWarning() << Q_FUNC_INFO << "Failed to open file";
        }
        else
        {
            QJsonDocument jsonDoc;
            QString jsonText = jsonFile.readAll();
            jsonFile.close();
            qDebug() << Q_FUNC_INFO << "File contents" << jsonText;
            QJsonParseError error;
            jsonDoc.fromJson(jsonText.toLocal8Bit(), &error);
    
            if(error.error == QJsonParseError::NoError)
            {
                 //This QVariant is empty
                QVariant variant = jsonDoc.object().toVariantMap();
    
                fillInMap(variant.toMap());
            }
            else
            {
                qWarning() << Q_FUNC_INFO << "JSON Parse Error: " << error.errorString();
            }
        }
    

    The output is as follows:

    ... Reading from file:  "/tmp/file.json"
    ... File contents "{\n\"variant\":\"variant\"\n}\n"
    ... fillInMap(const QVariantMap &) QMap()
    

    Does anybody have an idea of what I'm doing wrong here?



  • I found the reason for having this issue. I didn't store the result of fromJson function


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