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How to Test Ftp server availability

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  • B Offline
    B Offline
    beemaneni
    wrote on last edited by
    #1

    Hi
    I have a small requirement as i need to test Ftp availability using QNetworkAccessManager.

    I was able to transfer file to server.But i need to test availability first and then transfer file..
    How do i do that..Can anyone share a part of code or hints

    Thanks in Advance
    Bala Beemaneni

    Bala B
    Infinite Computer systems
    Chennai

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    0
    • siropS Offline
      siropS Offline
      sirop
      wrote on last edited by
      #2

      http://qt-project.org/doc/qt-5/qnetworkreply.html#error ?

      To be, or not to be: that is the question:
      Whether ’tis nobler in the mind to suffer
      The slings and arrows of outrageous fortune,
      Or to take arms against a sea of troubles,
      And by opposing end them?

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      • B Offline
        B Offline
        beemaneni
        wrote on last edited by
        #3

        Thats good...But i want to login in to FTP if it is available.How do i do that with QNetworkAccessManager?

        Thanks
        Bala Beemaneni

        Bala B
        Infinite Computer systems
        Chennai

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        0
        • siropS Offline
          siropS Offline
          sirop
          wrote on last edited by
          #4

          Try something like this:

          @ QUrl url("ftp://server/files/jgevas_FTPTest.txt");

          url.setUserName("login");
          
          url.setPassword("password");
          
          url.setPort(25);
          
          
          data = new QFile(file, this);
          

          if (data->open(QIODevice::ReadOnly))

          reply = manager.put(QNetworkRequest(url), data);@
          

          http://qt-project.org/forums/viewthread/31758

          Maybe, you should change the port number.

          To be, or not to be: that is the question:
          Whether ’tis nobler in the mind to suffer
          The slings and arrows of outrageous fortune,
          Or to take arms against a sea of troubles,
          And by opposing end them?

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          0
          • B Offline
            B Offline
            beemaneni
            wrote on last edited by
            #5

            The above example sends the file to an ftp server.My requirement is different.If You are awre of QFtp ,we do connect to host and login in to ftp .I want similar functionality using QNAM.I should just be able to test with the given credentials whether it is accessible or not? How do i that? Hope u understand the requirement now..

            Thanks
            Bala Beemaneni

            Bala B
            Infinite Computer systems
            Chennai

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            0
            • siropS Offline
              siropS Offline
              sirop
              wrote on last edited by
              #6

              The above example does everything you want, as you get
              QNetworkReply reply .

              In the next step you can do:

              @reply.error()@

              which yields http://qt-project.org/doc/qt-5/qnetworkreply.html#NetworkError-enum .

              To be, or not to be: that is the question:
              Whether ’tis nobler in the mind to suffer
              The slings and arrows of outrageous fortune,
              Or to take arms against a sea of troubles,
              And by opposing end them?

              1 Reply Last reply
              0
              • p3c0P Offline
                p3c0P Offline
                p3c0
                Moderators
                wrote on last edited by
                #7

                Hi,

                Did you check "authenticationRequired":http://qt-project.org/doc/qt-5/qnetworkaccessmanager.html#authenticationRequired ?
                Until valid credentials are given the signal is emitted again and again. If I understood you correctly this can be used in your case.

                157

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                • B Offline
                  B Offline
                  beemaneni
                  wrote on last edited by
                  #8

                  Hi sirop,
                  The above examples does everything ..i get error from QNetworkReply as "NO ERROR". But i do not want to send that text file and verify the accessibility..
                  Here we use
                  @ reply = manager.put(QNetworkRequest(url), data);@
                  i want to send only the ftp address as
                  reply = manager.put or get (QNetworkRequest(url));

                  I am not sure what function to use whether it is get or put or something else..?
                  Let me give an example like i.e..the way we ping and find the accessibility of a network just with address

                  Thanks
                  Bala Beemaneni

                  Bala B
                  Infinite Computer systems
                  Chennai

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                  • siropS Offline
                    siropS Offline
                    sirop
                    wrote on last edited by
                    #9

                    I would then use:
                    @QNetworkReply * QNetworkAccessManager::get(const QNetworkRequest & request)@

                    To be, or not to be: that is the question:
                    Whether ’tis nobler in the mind to suffer
                    The slings and arrows of outrageous fortune,
                    Or to take arms against a sea of troubles,
                    And by opposing end them?

                    1 Reply Last reply
                    0
                    • B Offline
                      B Offline
                      beemaneni
                      wrote on last edited by
                      #10

                      Hi p3c0
                      That signal emits only if authentication either username or password set mismatches.What i need is i want is on button click need to just login in to ftp server and on another button click logout from ftp server.

                      Bala B
                      Infinite Computer systems
                      Chennai

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                      • B Offline
                        B Offline
                        beemaneni
                        wrote on last edited by
                        #11

                        hi sirop,
                        hi i did test that but of no use.Here is my code...
                        @ QUrl testFtp("ftp://"+server);
                        testFtp.setUserName(userId);
                        testFtp.setPassword(password);
                        testFtp.setPort(21);
                        request.setUrl(testFtp);

                        // reply = manager.put(request,testData);
                        reply = manager.get(request);
                        connect(reply,SIGNAL(readyRead()),this,SLOT(readData()));
                        connect(reply,SIGNAL(uploadProgress(qint64,qint64)),this,SLOT(fileTransferProgress(qint64,qint64)));
                        connect(reply, SIGNAL(error(QNetworkReply::NetworkError)),this, SLOT(slotError(QNetworkReply::NetworkError)));
                        connect(reply, SIGNAL(sslErrors(QList<QSslError>)),this, SLOT(slotSslErrors(QList<QSslError>)));@

                        i get the error in Network Error says "202".
                        i.e: QNetworkReply::ContentOperationNotPermittedError

                        Bala B
                        Infinite Computer systems
                        Chennai

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                        • p3c0P Offline
                          p3c0P Offline
                          p3c0
                          Moderators
                          wrote on last edited by
                          #12

                          Well then another way would be to try to download file from ftp server. If it exists then on finished signal you should get NoError
                          Eg:
                          @
                          manager->get(QNetworkRequest(QUrl("ftp://ftp.ed.ac.uk/pub/Unix/NT4_PlainPassword.reg")));
                          ...

                          void MainWindow::replyFinished(QNetworkReply *reply)
                          {
                          qDebug() << "Reply: " << reply->error(); //will show 0
                          }
                          @

                          157

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                          • B Offline
                            B Offline
                            beemaneni
                            wrote on last edited by
                            #13

                            hi dude...
                            thats not the way i guess.We just have an ip address,user,password.Just we need to ensure whether we are reachable to the server or not..We do not know what are the contents in ftp.So we cant download a file.
                            So cant we just login or connect to ftp server using QNAM?
                            What about the QNetworkSession? I could not understand this..can u suggest something else

                            Thanks for ur interest p3c0

                            Bala B
                            Infinite Computer systems
                            Chennai

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                            • p3c0P Offline
                              p3c0P Offline
                              p3c0
                              Moderators
                              wrote on last edited by
                              #14

                              Deleted

                              157

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                              • p3c0P Offline
                                p3c0P Offline
                                p3c0
                                Moderators
                                wrote on last edited by
                                #15

                                Another way would be to try to connect the server using QTcpSocket as
                                @
                                QTcpSocket *socket = new QTcpSocket;
                                connect(socket,SIGNAL(connected()),this,SLOT(onConnected()));
                                socket->connectToHost("192.168.1.145",21);
                                if(!socket->waitForConnected(2000)) {
                                qDebug() << "Not connected";
                                socket->abort();
                                }
                                @

                                If it succeeds then onConnected will be called immediately. But not sure if this is the recommended way.

                                157

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                                • B Offline
                                  B Offline
                                  beemaneni
                                  wrote on last edited by
                                  #16

                                  hi ,
                                  we may not have hostnames for all the ftp servers.So may not help much.
                                  yeah using TCP will work.Bt right now i am googling for the QNAM API's which can do that.

                                  Let me know if u get any from QNAM or supporting ones

                                  Bala B
                                  Infinite Computer systems
                                  Chennai

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                                  0
                                  • B Offline
                                    B Offline
                                    beemaneni
                                    wrote on last edited by
                                    #17

                                    Hii guys

                                    Any updates on the previous ???
                                    And i would like to add one more to this as..

                                    1. When the network we try to connect is not in reach it does not give error on time..It takes a lot of time and some times it never returns any error..How do i handle this?

                                       @    connect(reply, SIGNAL(error(QNetworkReply::NetworkError)),this, SLOT(slotError(QNetworkReply::NetworkError)));@
                                      

                                    i am catching above signal which takes a lot of time...
                                    Are there any best methods?

                                    Thanks

                                    Bala B
                                    Infinite Computer systems
                                    Chennai

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                                    0
                                    • siropS Offline
                                      siropS Offline
                                      sirop
                                      wrote on last edited by
                                      #18

                                      Try to use QTimer ?

                                      To be, or not to be: that is the question:
                                      Whether ’tis nobler in the mind to suffer
                                      The slings and arrows of outrageous fortune,
                                      Or to take arms against a sea of troubles,
                                      And by opposing end them?

                                      1 Reply Last reply
                                      0
                                      • B Offline
                                        B Offline
                                        beemaneni
                                        wrote on last edited by
                                        #19

                                        Hi,
                                        i feel there will be a straight way to do it with QNetworkAccessManager or with QNetworkReply.Probably we are missing that..

                                        Thanks

                                        Bala B
                                        Infinite Computer systems
                                        Chennai

                                        1 Reply Last reply
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