How to parse nested JSON Array and Object inside array

[Radhika]

{
"physicaldrives":
    [
        {
            "data":
            {
                "dev_id": "0",
                "ssd_life_left": "0"
           }
        },
		{
            "data":
            {
                "dev_id": "1",
                "ssd_life_left": "10"
 
            }
        }
    ]
}

{
"physicaldrives":
    [
        {
            "data":
            {
                "dev_id": "0",
                "ssd_life_left": "0"
           }
        },
		{
            "data":
            {
                "dev_id": "1",
                "ssd_life_left": "10"
               
            }
        }
    ]
}

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this is snippet of JSON how can I parse it in Qt 5

i have tried this

QString strReply = (QString)reply->readAll();
 
    QStringList phydata;
 
    QJsonDocument jsonResponse = QJsonDocument::fromJson(strReply.toUtf8());
    if(jsonResponse.isEmpty())
            return false;
 
    QJsonObject jsonObj = jsonResponse.object();
    QJsonArray jsonArray = jsonObj["physicaldrives"].toArray();
    if(jsonArray.isEmpty())
            return false;
    qDebug()<< "jsonArray phyDatas" << jsonArray ;
 
    // fatching JSONArray of Ph
    foreach (const QJsonValue & value, jsonArray)
    {
        QJsonObject obj = value.toObject();
        phydata.append(obj["data"].toString());
        qDebug()<< "phyDatas" << phydata ;
    }
 
    // fatching value from JSONArray
    QJsonValue val = obj["dev_id"];
 
    qDebug()<< "devID" << val.toInt(); ;

QString strReply = (QString)reply->readAll();

    QStringList phydata;

    QJsonDocument jsonResponse = QJsonDocument::fromJson(strReply.toUtf8());
    if(jsonResponse.isEmpty())
            return false;

    QJsonObject jsonObj = jsonResponse.object();
    QJsonArray jsonArray = jsonObj["physicaldrives"].toArray();
    if(jsonArray.isEmpty())
            return false;
    qDebug()<< "jsonArray phyDatas" << jsonArray ;

    // fatching JSONArray of Ph
    foreach (const QJsonValue & value, jsonArray)
    {
        QJsonObject obj = value.toObject();
        phydata.append(obj["data"].toString());
        qDebug()<< "phyDatas" << phydata ;
    }

    // fatching value from JSONArray
    QJsonValue val = obj["dev_id"];
    
    qDebug()<< "devID" << val.toInt(); ;

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but I dont know its right way or not?
how can I get list of "drv_id" of "data" object ??????

[anda_skoa]

This is not likely the actual code, because it won't compile as obj in line 24 is an unknown identifier.

Get the object for "data" and then access that object's "dev_id" property.

Btw, unnecessary double conversion QByteArray -> QString -> QByteArray right at the beginning.

Cheers,
_

[Radhika]

Will you explain it with code?


I have tried this but not working

// fetching JSONArray
    foreach (const QJsonValue & value, jsonArray)
 
    {
        QJsonObject jobj = value.toObject();
        QJsonValue val = jobj.value(QString("data"));
        qDebug() << "data" <<val.toString() << endl;
 
        QJsonObject item = val.toObject();
        QJsonValue subobj = item["dev_id"];
        QString str = subobj.toString();
        qDebug() << "dev_id" <<str << endl;
 
    }

// fetching JSONArray
    foreach (const QJsonValue & value, jsonArray)

    {
        QJsonObject jobj = value.toObject();
        QJsonValue val = jobj.value(QString("data"));
        qDebug() << "data" <<val.toString() << endl;

        QJsonObject item = val.toObject();
        QJsonValue subobj = item["dev_id"];
        QString str = subobj.toString();
        qDebug() << "dev_id" <<str << endl;

    }

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[anda_skoa]

That looks about right, though I wonder why you use value() when getting "data" but the index operator when getting other fields
Which debug output does not display what you expect? I.e. where does it start to go wrong?

Cheers,
_

[Radhika]

I am not getting you
kindly explain it with code

if(jsonArray.isEmpty())
            return false;
    qDebug()<< "jsonArray phyDatas" << jsonArray ;

if(jsonArray.isEmpty())
            return false;
    qDebug()<< "jsonArray phyDatas" << jsonArray ;

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till this its working fine but after dat while getting data and dev_id I am not getting dev_id
i got "" blank response

will you plz explain it with correct code??

[anda_skoa]

Attach a buildable and runnable test program.

Cheers,
_