Sending parameters by get method to rest api

[ali-aydin]

I need to send parameters to Rest API by the get methods
i can get token and make authenticate but in sending other parameters there is some problems.my code is like this:

 QUrl url("http://localhost:59444/api/Getmojodi");
    QNetworkRequest req1;
    const QByteArray basic_authorization =token.toUtf8().toBase64();
    req1.setRawHeader(QByteArrayLiteral("Authorization"), basic_authorization);
    QUrlQuery uq;
    uq.addQueryItem("KalaCode","20101010131310");
    url.setQuery(uq);
    req1.setUrl(url);
    QNetworkReply *rep= manager->get(req1);
    QString val = rep->readAll();
    QJsonDocument jDoc=QJsonDocument::fromJson(val.toUtf8());
    QJsonObject obj = jDoc.object();
    qDebug()<<obj["mojodi"].toString();//is empty.

[SGaist]

Hi,

Your problem is that you are reading the reply before the processing is finished. QNetworkAccessManager like many of Qt classes is asynchronous hence you have to use it that way.

[ali-aydin]

@SGaist
your mean that i should use reply's finish signal?

[SGaist]

Yes, exactly.

[ali-aydin]

@SGaist
No that is not ok
can you give an example?please

[Axel Spoerl]

@ali-aydin said in Sending parameters by get method to rest api:
If you want your code to block until the reply has arrived, create an event loop on the stack, connect the network reply's finished signal to the quit slot of the event loop and exec() it.

QUrl url("http://localhost:59444/api/Getmojodi");
  QNetworkRequest req1;
  const QByteArray basic_authorization =token.toUtf8().toBase64();
  req1.setRawHeader(QByteArrayLiteral("Authorization"), basic_authorization);
  QUrlQuery uq;
  uq.addQueryItem("KalaCode","20101010131310");
  url.setQuery(uq);
  req1.setUrl(url);
  QNetworkReply *rep= manager->get(req1);
  // blocking code starts here
  QEventLoop loop;
  QObject::connect(rep, &QNetworkReply::finished, &loop, &QEventLoop::quit);
  loop.exec();
  // end of blocking code
  QString val = rep->readAll();
  QJsonDocument jDoc=QJsonDocument::fromJson(val.toUtf8());
  QJsonObject obj = jDoc.object();
  qDebug()<<obj["mojodi"].toString();//is empty.

[ali-aydin]

@Axel-Spoerl
Thanks for your help
but it is not ok not only this case but also I changed the code a bit
but is not ok yet
changed code:

    QUrl url("http://localhost:59444/api/Getmojodi");
    QNetworkRequest req1;
    const QByteArray basic_authorization =token.toUtf8().toBase64();
    req1.setRawHeader(QByteArrayLiteral("Authorization"), basic_authorization);
    QUrlQuery uq;
    uq.addQueryItem("KalaCode","20101010131310");
    url.setQuery(uq);
    req1.setUrl(url);
    QNetworkReply *rep= manager->get(req1);
    // blocking code starts here
    QEventLoop loop;
    QTimer timer;
    timer.setSingleShot(true);

    QObject::connect(&timer,&QTimer::timeout,&loop,&QEventLoop::quit);
    QObject::connect(rep, &QNetworkReply::finished, &loop, &QEventLoop::quit);
    timer.start(5000);
    loop.exec();
    // end of blocking code
    if(!timer.isActive())
    {
    QString val = rep->readAll();
    QJsonDocument jDoc=QJsonDocument::fromJson(val.toUtf8());
    QJsonObject obj = jDoc.object();
    qDebug()<<val;//obj["mojodi"].toString();
    }

[SGaist]

You are not doing any error management so you can't know what is happening.

[JonB]

@ali-aydin said in Sending parameters by get method to rest api:

but is not ok yet

if(!timer.isActive())

qDebug()<<val;

... and additionally to @SGaist why not tell us whether it times out or what it outputs?

[ali-aydin]

@SGaist
there is not error
because I can get token and make authorization

[SGaist]

Authentication, authorization and request management are three different stages that all can fail separately. The fact that you can authenticate does not mean that everything else is working.

[ali-aydin]

@SGaist
so how does it work?
I can not find any way.

[SGaist]

The best place is the documentation: QNetworkReply::errorOccured.

[ali-aydin]

@SGaist
@Axel-Spoerl
I changed slot that connected to finish signal like this :

QByteArray bytes = R->readAll();
    QString str = QString::fromUtf8(bytes.data(), bytes.size());
    int statusCode = R->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
    qDebug() << QVariant(statusCode).toString();

and return 403 code it means forbidden.why?

[Axel Spoerl]

403 is what your server sends. It means that your parameters are incorrect or the server itself has (due to misconfiguration) no access to the requested resource.
Have you tried the call with postman or a browser?

[ali-aydin]

@Axel-Spoerl
Yes I tried by postman and is ok

[JonB]

@ali-aydin
Your platform/web server may/should have the ability to log all requests/responses to a log file? You might switch that on and see if anything helpful there?

[ali-aydin]

@JonB
OS is Windows 10 and qt 5.15.2

[JonB]

@ali-aydin Look in your web server's documentation.

[ali-aydin]

@JonB
API's documentation?