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Sending parameters by get method to rest api

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  • SGaistS 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-aydinA Offline
    ali-aydinA Offline
    ali-aydin
    wrote on last edited by
    #3

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

    1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #4

      Yes, exactly.

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

      ali-aydinA 1 Reply Last reply
      0
      • SGaistS SGaist

        Yes, exactly.

        ali-aydinA Offline
        ali-aydinA Offline
        ali-aydin
        wrote on last edited by
        #5

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

        1 Reply Last reply
        1
        • ali-aydinA 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.
          
          Axel SpoerlA Offline
          Axel SpoerlA Offline
          Axel Spoerl
          Moderators
          wrote on last edited by Axel Spoerl
          #6

          @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.
          

          Software Engineer
          The Qt Company, Oslo

          ali-aydinA 1 Reply Last reply
          1
          • Axel SpoerlA 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-aydinA Offline
            ali-aydinA Offline
            ali-aydin
            wrote on last edited by
            #7

            @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();
                }
            
            JonBJ 1 Reply Last reply
            0
            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #8

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

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

              ali-aydinA 1 Reply Last reply
              1
              • ali-aydinA 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();
                    }
                
                JonBJ Online
                JonBJ Online
                JonB
                wrote on last edited by
                #9

                @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?

                1 Reply Last reply
                0
                • SGaistS SGaist

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

                  ali-aydinA Offline
                  ali-aydinA Offline
                  ali-aydin
                  wrote on last edited by
                  #10

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

                  1 Reply Last reply
                  0
                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #11

                    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.

                    Interested in AI ? www.idiap.ch
                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                    ali-aydinA 1 Reply Last reply
                    0
                    • SGaistS 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-aydinA Offline
                      ali-aydinA Offline
                      ali-aydin
                      wrote on last edited by
                      #12

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

                      1 Reply Last reply
                      0
                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #13

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

                        Interested in AI ? www.idiap.ch
                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                        ali-aydinA 1 Reply Last reply
                        2
                        • SGaistS SGaist

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

                          ali-aydinA Offline
                          ali-aydinA Offline
                          ali-aydin
                          wrote on last edited by ali-aydin
                          #14

                          @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?

                          1 Reply Last reply
                          0
                          • Axel SpoerlA Offline
                            Axel SpoerlA Offline
                            Axel Spoerl
                            Moderators
                            wrote on last edited by
                            #15

                            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?

                            Software Engineer
                            The Qt Company, Oslo

                            ali-aydinA 1 Reply Last reply
                            0
                            • Axel SpoerlA 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-aydinA Offline
                              ali-aydinA Offline
                              ali-aydin
                              wrote on last edited by
                              #16

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

                              JonBJ 1 Reply Last reply
                              0
                              • ali-aydinA ali-aydin

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

                                JonBJ Online
                                JonBJ Online
                                JonB
                                wrote on last edited by
                                #17

                                @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-aydinA 1 Reply Last reply
                                0
                                • JonBJ 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-aydinA Offline
                                  ali-aydinA Offline
                                  ali-aydin
                                  wrote on last edited by
                                  #18

                                  @JonB
                                  OS is Windows 10 and qt 5.15.2

                                  JonBJ 1 Reply Last reply
                                  0
                                  • ali-aydinA ali-aydin

                                    @JonB
                                    OS is Windows 10 and qt 5.15.2

                                    JonBJ Online
                                    JonBJ Online
                                    JonB
                                    wrote on last edited by
                                    #19

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

                                    ali-aydinA 1 Reply Last reply
                                    0
                                    • JonBJ JonB

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

                                      ali-aydinA Offline
                                      ali-aydinA Offline
                                      ali-aydin
                                      wrote on last edited by
                                      #20

                                      @JonB
                                      API's documentation?

                                      1 Reply Last reply
                                      0
                                      • M Offline
                                        M Offline
                                        mchinand
                                        wrote on last edited by
                                        #21

                                        I think you have to add 'Basic ' before your token when you set the Authorization header (or 'Bearer ' if you are doing bearer token auth). If things are working in Postman, check the 'Headers' tab of your request as to what is the actual value being sent for the Authorization.

                                        ali-aydinA 1 Reply Last reply
                                        0
                                        • M mchinand

                                          I think you have to add 'Basic ' before your token when you set the Authorization header (or 'Bearer ' if you are doing bearer token auth). If things are working in Postman, check the 'Headers' tab of your request as to what is the actual value being sent for the Authorization.

                                          ali-aydinA Offline
                                          ali-aydinA Offline
                                          ali-aydin
                                          wrote on last edited by ali-aydin
                                          #22

                                          @mchinand
                                          Bearer must be added to the token.
                                          in postman there is no header
                                          in authorization tab
                                          only added token and in parameters tab is only one parameter :KalaCode
                                          in body tab username,password and grant_type
                                          in the qt when I want to authenticate by

                                          QUrl url("http://localhost:594444/api/authenticate");
                                          

                                          it returns "Hello"
                                          but when i changing url to

                                          QUrl url("http://localhost:594444/api/Getmojodi" );
                                          

                                          it does not work

                                          1 Reply Last reply
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