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QSocketNotifier: Socket notifiers cannot be enabled or disabled from another thread

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  • R Offline
    R Offline
    rktech
    wrote on last edited by
    #7

    @Christian-Ehrlicher I have read the example like three-times, but I still don't know how to fix it. Can you help me?

    Christian EhrlicherC 1 Reply Last reply
    0
    • R rktech

      @Christian-Ehrlicher I have read the example like three-times, but I still don't know how to fix it. Can you help me?

      Christian EhrlicherC Offline
      Christian EhrlicherC Offline
      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on last edited by
      #8

      @rktech said in QSocketNotifier: Socket notifiers cannot be enabled or disabled from another thread:

      but I still don't know how to fix it.

      You have to override incomingConnection() as shown there.

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      • R Offline
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        rktech
        wrote on last edited by
        #9

        @Christian-Ehrlicher said in QSocketNotifier: Socket notifiers cannot be enabled or disabled from another thread:

        @rktech said in QSocketNotifier: Socket notifiers cannot be enabled or disabled from another thread:

        but I still don't know how to fix it.

        You have to override incomingConnection() as shown there.

        I have tried, but I don't know how to implement that into my code.

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #10

          What exactly have you tried ?

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          • SGaistS SGaist

            What exactly have you tried ?

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            rktech
            wrote on last edited by
            #11

            @SGaist To add override to my code, but I don't know where should I place it...

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            • R Offline
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              rktech
              wrote on last edited by
              #12

              @SGaist How can I send the connection from incomingConnection() to Pool?

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              • R Offline
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                rktech
                wrote on last edited by
                #13

                @SGaist I have successfully overrided the incomingconnection(), but I don't know, how to pass it to the Pool.

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #14

                  You'll have to redesign your pool a bit to ensure that your sockets are created in the context of the run method of your QThread subclass.

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                  • SGaistS SGaist

                    You'll have to redesign your pool a bit to ensure that your sockets are created in the context of the run method of your QThread subclass.

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                    rktech
                    wrote on last edited by
                    #15

                    @SGaist I know, but how?

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                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #16

                      You have to transfer the descriptor to your pool and there in your run method create new sockets when descriptors are added.

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                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                      • SGaistS SGaist

                        You have to transfer the descriptor to your pool and there in your run method create new sockets when descriptors are added.

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                        rktech
                        wrote on last edited by
                        #17

                        @SGaist Should I add this part of code to my Pool::add() method? (Of course with editing it)

                        QTcpSocket tcpSocket;
                        
                            if (!tcpSocket.setSocketDescriptor(socketDescriptor)) {
                                emit error(tcpSocket.error());
                                return;
                            }
                        
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                        • SGaistS SGaist

                          You have to transfer the descriptor to your pool and there in your run method create new sockets when descriptors are added.

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                          rktech
                          wrote on last edited by
                          #18

                          @SGaist I have (probably) successfully rewritten the Pool add method, but I have another problem. When I add this:

                          protected:
                              void incomingConnection(qintptr socketDescriptor) override;
                          

                          to myserver.h I get this error:

                          ...\myserver.h:35: Chyba: only virtual member functions can be marked 'override'
                          

                          (Chyba is Error in my local)
                          What I am doing wrong?

                          mrjjM 1 Reply Last reply
                          0
                          • R rktech

                            @SGaist I have (probably) successfully rewritten the Pool add method, but I have another problem. When I add this:

                            protected:
                                void incomingConnection(qintptr socketDescriptor) override;
                            

                            to myserver.h I get this error:

                            ...\myserver.h:35: Chyba: only virtual member functions can be marked 'override'
                            

                            (Chyba is Error in my local)
                            What I am doing wrong?

                            mrjjM Offline
                            mrjjM Offline
                            mrjj
                            Lifetime Qt Champion
                            wrote on last edited by mrjj
                            #19

                            Hi
                            well it is virtual https://doc.qt.io/qt-5/qtcpserver.html#incomingConnection
                            so does Pool inherit QTcpServer ?
                            The error you get says "Hey, i dont see that funtion in base class, so you cant use override"

                            R 2 Replies Last reply
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                            • mrjjM mrjj

                              Hi
                              well it is virtual https://doc.qt.io/qt-5/qtcpserver.html#incomingConnection
                              so does Pool inherit QTcpServer ?
                              The error you get says "Hey, i dont see that funtion in base class, so you cant use override"

                              R Offline
                              R Offline
                              rktech
                              wrote on last edited by
                              #20

                              @mrjj No, the server is build under the myserver class

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                              • R rktech

                                @mrjj No, the server is build under the myserver class

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                                rktech
                                wrote on last edited by
                                #21
                                This post is deleted!
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                                • mrjjM mrjj

                                  Hi
                                  well it is virtual https://doc.qt.io/qt-5/qtcpserver.html#incomingConnection
                                  so does Pool inherit QTcpServer ?
                                  The error you get says "Hey, i dont see that funtion in base class, so you cant use override"

                                  R Offline
                                  R Offline
                                  rktech
                                  wrote on last edited by
                                  #22

                                  @mrjj the header of server look like:

                                  #ifndef MYSERVER_H
                                  #define MYSERVER_H
                                  
                                  #include <QObject>
                                  #include <QDebug>
                                  #include <QTcpServer>
                                  #include <QTcpSocket>
                                  #include <QString>
                                  #include <QFile>
                                  #include <QStandardPaths>
                                  #include <QThread>
                                  #include <QElapsedTimer>
                                  #include <pool.h>
                                  #include <QDateTime>
                                  class MyServer : public QObject
                                  {
                                      Q_OBJECT
                                  public:
                                      explicit MyServer(QObject *parent = nullptr);
                                  
                                  signals:
                                  
                                  public slots:
                                      void newConnection();
                                      void onReadyRead();
                                  
                                  private:
                                      QTcpServer *server;
                                      QList<QTcpSocket*>  _sockets;
                                      QString a;
                                      QString com;
                                      QTcpSocket *socket;
                                      QList<QTcpSocket*> sl;
                                  /*protected:
                                      void incomingConnection(qintptr socketDescriptor) override;*/
                                  };
                                  
                                  #endif // MYSERVER_H
                                  
                                  
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                                  • Christian EhrlicherC Offline
                                    Christian EhrlicherC Offline
                                    Christian Ehrlicher
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #23

                                    Sorry but please learn C++ first. If you want to override a function from a class you should inherit from this class. So inherit from QTcpServer, override the function and do whatever you want to. This is basic c++ stuff...

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                                    R 2 Replies Last reply
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                                    • Christian EhrlicherC Christian Ehrlicher

                                      Sorry but please learn C++ first. If you want to override a function from a class you should inherit from this class. So inherit from QTcpServer, override the function and do whatever you want to. This is basic c++ stuff...

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                                      rktech
                                      wrote on last edited by
                                      #24

                                      @Christian-Ehrlicher That's the thing, that I didn't notice. Thanks

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                                      • Christian EhrlicherC Christian Ehrlicher

                                        Sorry but please learn C++ first. If you want to override a function from a class you should inherit from this class. So inherit from QTcpServer, override the function and do whatever you want to. This is basic c++ stuff...

                                        R Offline
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                                        rktech
                                        wrote on last edited by
                                        #25

                                        @Christian-Ehrlicher But I don't know, how to edit it.

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                                        • R Offline
                                          R Offline
                                          rktech
                                          wrote on last edited by
                                          #26

                                          I have rewritten half of my project to solve the problem:
                                          myserver.h

                                          #ifndef MYSERVER_H
                                          #define MYSERVER_H
                                          #include <QStringList>
                                          #include <QTcpServer>
                                          #include <QDateTime>
                                          class MyServer : public QTcpServer
                                          {
                                              Q_OBJECT
                                          
                                          public:
                                              MyServer(QObject *parent = nullptr);
                                          
                                          protected:
                                              void incomingConnection(qintptr socketDescriptor) override;
                                          
                                          private:
                                              QStringList fortunes;
                                          };
                                          
                                          #endif // MYSERVER_H
                                          

                                          myserver.cpp

                                          #include "myserver.h"
                                          #include "pool.h"
                                          Pool p;
                                          
                                          MyServer::MyServer(QObject *parent)
                                              : QTcpServer(parent)
                                          {
                                              p.start();
                                          }
                                          
                                          void MyServer::incomingConnection(qintptr socketDescriptor)
                                          {
                                          QDateTime qdt;
                                          p.add(socketDescriptor,qdt.time());
                                          }
                                          

                                          pool.h

                                          #ifndef POOL_H
                                          #define POOL_H
                                          #include<QObject>
                                          #include<QThread>
                                          #include<QTcpSocket>
                                          #include<QDateTime>
                                          #include<QElapsedTimer>
                                          class Pool : public QThread
                                          {
                                              Q_OBJECT
                                          
                                          protected:
                                              void run();
                                          private:
                                              struct conn{
                                                  QTcpSocket *s;
                                                  QTime qdt;
                                              };
                                              QList<conn> x;
                                          public:
                                              void add(int socketDescriptor, QTime qdt);
                                          };
                                          #endif // POOL_H
                                          

                                          pool.cpp

                                          #include "pool.h"
                                          #include <QElapsedTimer>
                                          void Pool::run()
                                          {
                                          QElapsedTimer qet;
                                          qet.start();
                                          while (true) {
                                              if(qet.elapsed()>=5000){
                                                  foreach (conn y, x) {
                                                      if(y.s==nullptr){
                                                          qDebug()<<"empty";
                                                          continue;
                                                      }
                                                      y.s->write("test");
                                                      y.s->flush();
                                                  }
                                                  qet.restart();
                                              }
                                          }
                                          }
                                          void Pool::add(int socketDescriptor, QTime qdt){
                                          QTcpSocket* s = new QTcpSocket;
                                          s->setSocketDescriptor(socketDescriptor);
                                          s->write("1\n");
                                          conn c;
                                          c.s=s;
                                          c.qdt=qdt;
                                          x.append(c);
                                          }
                                          

                                          But I have still the same error:

                                          QSocketNotifier: Socket notifiers cannot be enabled or disabled from another thread
                                          

                                          What's wrong?

                                          1 Reply Last reply
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