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Send and receive strings with QTcpSocket

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qtcpsockettcpclientserver
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  • C Offline
    C Offline
    Captain Matsuyo
    wrote on 3 Jun 2019, 21:00 last edited by
    #1

    Hello, I have a project with a window which displays some numeric informations. This informations come from a tcp server so I tried to add a tcp client in my program with these lines below that is supposed to send a message to my server regarding to it, the message is not received, could I have some help please ?
    My code :

        //Creation socket
        QTcpSocket socMeteo;
        socMeteo.connectToHost("192.168.1.35",10001);
        
        //Envoi de donnees
        QTextStream texte(&socHauteur);
        //texte<<phrase<<endl;
        texte<<"Bonsoir"<<endl;
    

    Thank you very much

    J 1 Reply Last reply 4 Jun 2019, 04:50
    0
    • S Offline
      S Offline
      SGaist
      Lifetime Qt Champion
      wrote on 3 Jun 2019, 21:04 last edited by
      #2

      Hi and welcome to devnet,

      You are not checking whether the connection is successful, that would be the first step.

      How is your server implemented ?

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

      1 Reply Last reply
      4
      • C Offline
        C Offline
        Captain Matsuyo
        wrote on 3 Jun 2019, 21:27 last edited by
        #3

        My server is at school so right now I'm using Hercule setup utiliy to simulate a tcp server
        0_1559597036206_f7d387b0-ade2-4ee6-836f-55854a4951b6-image.png
        So how should I proceed to check if the connection is successful or not please ? I'm sorry I'm using QT Creator since April so I don't have a lot of knowledge

        1 Reply Last reply
        0
        • S Offline
          S Offline
          SGaist
          Lifetime Qt Champion
          wrote on 3 Jun 2019, 22:01 last edited by
          #4

          This has nothing to do with Qt Creator. Qt Creator is just an IDE.

          In any case, check waitForConnected

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

          1 Reply Last reply
          1
          • C Captain Matsuyo
            3 Jun 2019, 21:00

            Hello, I have a project with a window which displays some numeric informations. This informations come from a tcp server so I tried to add a tcp client in my program with these lines below that is supposed to send a message to my server regarding to it, the message is not received, could I have some help please ?
            My code :

                //Creation socket
                QTcpSocket socMeteo;
                socMeteo.connectToHost("192.168.1.35",10001);
                
                //Envoi de donnees
                QTextStream texte(&socHauteur);
                //texte<<phrase<<endl;
                texte<<"Bonsoir"<<endl;
            

            Thank you very much

            J Offline
            J Offline
            J.Hilk
            Moderators
            wrote on 4 Jun 2019, 04:50 last edited by
            #5

            @Captain-Matsuyo

            besides what @SGaist said about the connected state of your socket, this

            QTcpSocket socMeteo;

            is on the stack. My guess is, the QTcpSocket - object gets destroyed before the os has any chance of actually sending anything over the socket


            Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


            Q: What's that?
            A: It's blue light.
            Q: What does it do?
            A: It turns blue.

            1 Reply Last reply
            5
            • V Offline
              V Offline
              VRonin
              wrote on 4 Jun 2019, 08:53 last edited by VRonin 6 Apr 2019, 09:08
              #6

              QTcpSocket socMeteo;
              QTextStream texte(&socHauteur);

              These are 2 different sockets. What are you trying to do?

              It should be something like:

              auto socMeteo = new QTcpSocket(this);
              socMeteo->connectToHost("192.168.1.35",10001);
              connect(socMeteo,&QTcpSocket::connected,socMeteo,[socMeteo]()->void{
                  QTextStream texte(socMeteo);
                  texte<<"Bonsoir\n";
              });
              

              "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
              ~Napoleon Bonaparte

              On a crusade to banish setIndexWidget() from the holy land of Qt

              1 Reply Last reply
              6

              6/6

              4 Jun 2019, 08:53

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