Qt Parsing Json Object

Naresh

I am trying to parse json object in QT from an api. However when i try the codes written below i cannot parse the object. I simply want to get the information stored in those parameters. Please help me thank you !!!

API is

{
    "error": {
        "errorcode": 0,
        "errorstring": ""
    },
    "login": 1,
    "logintoken": "209b06aa7f059673db393ff7a731af1847344903b9733f026cc3a6f7a5b797b3"
}

The Codes are

 QNetworkReply* reply = manager->post(ava_request,postData);
loop.exec();

QString response = (QString)reply->readAll();
qDebug() << response;

QJsonDocument temp = QJsonDocument::fromJson(response.toUtf8());

 QJsonObject jsonObj = temp.object();
 qDebug() <<"error"<< jsonObj["error"].toString();
 qDebug() <<"login"<< jsonObj["login"].toString();
 qDebug() << "logintoken"<<jsonObj["logintoken"].toString();

the response string looks

and the output is

D/libAndroisShop.so(21944): ../AndroisShop/networkconnection.cpp:45 (QString NetworkConnection::Connect(QString, QString)): "<br><br>NO OF ROWDATA: 1{\"error\":{\"errorcode\":0,\"errorstring\":\"\"},\"login\":1,\"logintoken\":\"4daaf6b3dd5a26a2ad2c436e564bfa4d6c439ce4d0d6cd66705a8bdadddddaa0\"}"
D/libAndroisShop.so(21944): ../AndroisShop/networkconnection.cpp:50 (QString NetworkConnection::Connect(QString, QString)): error ""
D/libAndroisShop.so(21944): ../AndroisShop/networkconnection.cpp:51 (QString NetworkConnection::Connect(QString, QString)): login ""
D/libAndroisShop.so(21944): ../AndroisShop/networkconnection.cpp:52 (QString NetworkConnection::Connect(QString, QString)): logintoken ""

dheerendra

Your JSON is mix of array & objects. You need split them properly. I have given the code here. It is not optimised.

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MyWidget w;
    w.show();

    QString json = "{\"error\":{\"errorcode\":0,\"errorstring\":\"\"},\"login\":1,\"logintoken\":\"4daaf6b3dd5a26a2ad2c436e564bfa4d6c439ce4d0d6cd66705a8bdadddddaa0\"}";

    QJsonDocument temp = QJsonDocument::fromJson(json.toUtf8());
    if (temp.isArray()){
        qDebug() << " It is an array" <<endl;
    }
    if (temp.isObject()){
        qDebug() << " It is an Object" <<endl;
    }

    QJsonArray arr  = temp.array();
    qDebug() << " Array size = "  << arr.size() <<endl;

    QJsonObject obj  = temp.object();
    qDebug() << " Object size = "  << obj.size() <<endl;
    qDebug() << " Object size = "  << obj.keys() <<endl;
    QJsonObject::iterator it;
    for(it=obj.begin();it!=obj.end();it++){
        if(it.value().isObject()){
           QJsonObject o1 = it.value().toObject();
           qDebug() << " it is JSON Object" <<endl;
           qDebug() << " Key = " << it.key() << " Val =" << it.value() <<endl;
           QJsonObject::iterator it1 = o1.begin();
           for(it1=o1.begin();it1!=o1.end();it1++){
               qDebug() << " Key =" << it1.key();
               if (it1.value().isString()) {
                   qDebug() << " Value =" << it1.value().toString() <<endl;
               }
               if (it1.value().isDouble()) {
                   qDebug() << " Value =" << it1.value().toInt() <<endl;
               }
           }
        }else {
           qDebug() << " Key =" << it.key() << " Value =" << it.value() <<endl;
           if (it.value().isString()){
               qDebug() << " Value = " << it.value().toString() <<endl;
           }
           if (it.value().isDouble()){
               qDebug() << " Value = " << it.value().toInt() <<endl;
           }
        }
    }

    return a.exec();

JKSH

@Naresh said in Qt Parsing Json Object:

and the output is

...

"<br><br>NO OF ROWDATA: 1{\"error\":{\"errorcode\":0,\"errorstring\":\"\"},\"login\":1,\"logintoken\":\"4daaf6b3dd5a26a2ad2c436e564bfa4d6c439ce4d0d6cd66705a8bdadddddaa0\"}"

This is not a valid JSON document, so you cannot pass it into QJsonDocument::fromJson().

You must first remove the non-JSON string in front: "<br><br>NO OF ROWDATA: 1"

JKSH

@dheerendra said in Qt Parsing Json Object:

Your JSON is mix of array & objects.

There are no arrays in the @Naresh's example

dheerendra

@JKSH You are right. No arrays.

anas yousef

QJsonDocument doc = QJsonDocument::fromJson(response);
QJsonObject JON = doc.object();
QString error_code = JON.value("error").toObject().value("errorcode").toString();
QString error_string = JON.value("error").toObject().value("errorcode").toString();
int login = JON.value("login").toInt();
QString login_token = JON.value("logintoken").toString();

Stephen28

@dheerendra Hi, I am new to Qt and Learning Json Parsing.
To Parse this https://reqres.in/api/users/2 ,i've used your code sample. But it didn't worked. Help me solve this

JonB

@Stephen28
Hello and welcome.

This is an old thread. I suggest you open your own new topic. Paste in the

{"data":{"id":2,"email":"janet.weaver@reqres.in","first_name":"Janet","last_name":"Weaver","avatar":"https://reqres.in/img/faces/2-image.jpg"},"support":{"url":"https://reqres.in/#support-heading","text":"To keep ReqRes free, contributions towards server costs are appreciated!"}}

you are trying to parse. Show how far you got, e.g. does

QString input = R"(
{"data":{"id":2,"email":"janet.weaver@reqres.in","first_name":"Janet","last_name":"Weaver","avatar":"https://reqres.in/img/faces/2-image.jpg"},"support":{"url":"https://reqres.in/#support-heading","text":"To keep ReqRes free, contributions towards server costs are appreciated!"}}
)";
QJsonDocument doc = QJsonDocument::fromJson(input);
QJsonObject JON = doc.object();

at least work to get the top-level object?

Stephen28

@JonB said in Qt Parsing Json Object:

thread
Yes I tried this. And Worked .Thanks