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can not call function of different class

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  • J Offline
    J Offline
    JadeN001
    wrote on last edited by
    #10

    @koahnig @JonB I Don't have that much idea about debugger. Is there any alternative solution ?

    jsulmJ JonBJ 2 Replies Last reply
    0
    • J JadeN001

      @koahnig @JonB I Don't have that much idea about debugger. Is there any alternative solution ?

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #11

      @JadeN001 You should really learn to use a debugger. A debugger is one of the most important tools a programmer should use :-)

      https://forum.qt.io/topic/113070/qt-code-of-conduct

      1 Reply Last reply
      4
      • J JadeN001

        @koahnig @JonB I Don't have that much idea about debugger. Is there any alternative solution ?

        JonBJ Offline
        JonBJ Offline
        JonB
        wrote on last edited by JonB
        #12

        @JadeN001
        As @jsulm has just said, learning to use a debugger will in the long-run be the best time you spent! Just do it soon.

        In the meantime, in on_pushButton_send_clicked() just before you try to call mw->send_MsgToServer(send); I'd put in some more qDebug() statements which show some of the properties of your connection object via mw->.... You're looking to just verify that mw is indeed still pointing at some valid connection, just in case.....

        J 1 Reply Last reply
        4
        • JonBJ JonB

          @JadeN001
          As @jsulm has just said, learning to use a debugger will in the long-run be the best time you spent! Just do it soon.

          In the meantime, in on_pushButton_send_clicked() just before you try to call mw->send_MsgToServer(send); I'd put in some more qDebug() statements which show some of the properties of your connection object via mw->.... You're looking to just verify that mw is indeed still pointing at some valid connection, just in case.....

          J Offline
          J Offline
          JadeN001
          wrote on last edited by
          #13

          @JonB @jsulm yeah I really appreciate your suggestion. I will start.
          I have checked Value of object "mw" by qDebug(). and It returns proper object value.
          something like this :

          object :  connection(0x201c0350, name="connection")
          

          I thought that might be the issue is ,the object was not being generated properly.But i was wrong.

          JonBJ 1 Reply Last reply
          0
          • J JadeN001

            @JonB @jsulm yeah I really appreciate your suggestion. I will start.
            I have checked Value of object "mw" by qDebug(). and It returns proper object value.
            something like this :

            object :  connection(0x201c0350, name="connection")
            

            I thought that might be the issue is ,the object was not being generated properly.But i was wrong.

            JonBJ Offline
            JonBJ Offline
            JonB
            wrote on last edited by JonB
            #14

            @JadeN001
            Assuming it really is as you say, and you really have rebuilt your code etc., and you are compiling for/viewing debug, and it's not crashing, it's going to be pretty hard to answer how the line mw->send_MsgToServer(send) could simply "not get executed", without a debugger....

            One last thing I can think of, just in case. Your first line in send_MsgToServer() is:

            qDebug()<<"in sendmsgserver"<<m_pclientsocket;

            Just in case there's some problem serializing m_pclientsocket, temporarily change it to plain:

            qDebug()<<"in sendmsgserver"

            (I don't think there actually will have been an issue because I think you're only trying to print out the pointer here, but it's worth a try...)

            J 1 Reply Last reply
            0
            • JonBJ JonB

              @JadeN001
              Assuming it really is as you say, and you really have rebuilt your code etc., and you are compiling for/viewing debug, and it's not crashing, it's going to be pretty hard to answer how the line mw->send_MsgToServer(send) could simply "not get executed", without a debugger....

              One last thing I can think of, just in case. Your first line in send_MsgToServer() is:

              qDebug()<<"in sendmsgserver"<<m_pclientsocket;

              Just in case there's some problem serializing m_pclientsocket, temporarily change it to plain:

              qDebug()<<"in sendmsgserver"

              (I don't think there actually will have been an issue because I think you're only trying to print out the pointer here, but it's worth a try...)

              J Offline
              J Offline
              JadeN001
              wrote on last edited by
              #15

              @JonB yeah u r right. Here is problem in m_pClientsocket. Thank you for direct me. now, I am trying to solve socket problem

              1 Reply Last reply
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              • J Offline
                J Offline
                JadeN001
                wrote on last edited by JadeN001
                #16

                I have define m_pClientsocket in constructor of class
                but it failed to access in send_MsgToServer().
                because ,If I define in constuctor then when formclient class define the object on connection class

                FormClient::FormClient(QString name, QWidget *parent) :
                    QWidget(parent),
                    ui(new Ui::FormClient)
                {
                    ui->setupUi(this);
                    delegate=new mydelegate(this);
                    mw=new connection(this);
                 
                }
                

                At that time value of socket is getting changed.
                So the changes it bu moving the

                    m_pclientsocket= new QTcpSocket(this);
                
                

                in to another main function.

                 void connection::on_pushButton_connect_clicked()
                {
                    m_pclientsocket= new QTcpSocket(this);
                
                    ui->textEdit_Sendname->clear();
                   m_pclientsocket->connectToHost(ui->textEdit_IP->toPlainText(),quint16(ui->textEdit_Port->toPlainText().toInt()));
                   if(m_pclientsocket->waitForConnected(1000)){
                   qDebug()<<"connected"<<m_pclientsocket;
                   ui->label_connection->setText("Connected to Server");
                   }
                }
                

                send_MsgToServer() can not access it . where i am wrong.? what could be solution?

                1 Reply Last reply
                0
                • J Offline
                  J Offline
                  JadeN001
                  wrote on last edited by JadeN001
                  #17

                  In send_MsgToServer(). the ans of

                  void connection::send_MsgToServer(QString msg)
                  { 
                  qDebug()<<"in sendmsgserver"<<m_pclientsocket;
                      m_pclientsocket->write(msg.toStdString().c_str());
                      qDebug()<<"message sended "<<msg;
                  }
                  
                  in sendmsgserver QApplication(0x22fe28)
                  QIODevice::write (QApplication): device not open
                  

                  what it is indicating? How can be value of socket be like QApplication.

                  1 Reply Last reply
                  1
                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #18

                    Hi,

                    Why are you creating a new QTcpSocket each time you call on_pushButton_connect_clicked ?

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

                    aha_1980A J 2 Replies Last reply
                    1
                    • SGaistS SGaist

                      Hi,

                      Why are you creating a new QTcpSocket each time you call on_pushButton_connect_clicked ?

                      aha_1980A Offline
                      aha_1980A Offline
                      aha_1980
                      Lifetime Qt Champion
                      wrote on last edited by
                      #19

                      And why are you using waitForConnected?

                      this cannot work. use signals&slots!

                      regards

                      Qt has to stay free or it will die.

                      J 1 Reply Last reply
                      1
                      • SGaistS SGaist

                        Hi,

                        Why are you creating a new QTcpSocket each time you call on_pushButton_connect_clicked ?

                        J Offline
                        J Offline
                        JadeN001
                        wrote on last edited by
                        #20

                        @SGaist because the Problem i am facing :
                        if I called new QTcpSocket from constructor,then

                        FormClient::FormClient(QString name, QWidget *parent) :
                            QWidget(parent),
                            ui(new Ui::FormClient)
                        {
                            ui->setupUi(this);
                            delegate=new mydelegate(this);
                            mw=new connection(this);
                         
                        }
                        

                        this class create QTcpSocket evety time when mw=new connection(this); called.
                        because of that the void connection::send_MsgToServer(QString msg)
                        get different value of QTcpsocket.

                        1 Reply Last reply
                        0
                        • aha_1980A aha_1980

                          And why are you using waitForConnected?

                          this cannot work. use signals&slots!

                          regards

                          J Offline
                          J Offline
                          JadeN001
                          wrote on last edited by
                          #21

                          @aha_1980 yeah i will correct it.but my problem is still there.

                          1 Reply Last reply
                          0
                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #22

                            Currently, with the code you provided, it seems you already have an architectural problem.

                            Can you describe what you are exactly trying to build ?

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

                            J 1 Reply Last reply
                            1
                            • SGaistS SGaist

                              Currently, with the code you provided, it seems you already have an architectural problem.

                              Can you describe what you are exactly trying to build ?

                              J Offline
                              J Offline
                              JadeN001
                              wrote on last edited by
                              #23

                              @SGaist I am creating one QTableview on clientside.when ever client connected,one editor for chatting will create in that tableview.

                              0_1530341586271_ju.png

                              If want to send message to John from this editor.but when i send message from particular editor the value of QtcpSocket i am getting is somthing like this "

                              in sendmsgserver QApplication(0x22fe28)
                              QIODevice::write (QApplication): device not open
                              

                              connection.cpp is class where socket is created.
                              formclient.cpp is class of widgets of chatting.

                              1 Reply Last reply
                              0
                              • J Offline
                                J Offline
                                JadeN001
                                wrote on last edited by JadeN001
                                #24

                                Can anyone suggest me , have I worked in a proper way or not?

                                1 Reply Last reply
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