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readyread() signal doesn't emit after sendmessage() signal on pushbutton

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  • JonBJ JonB

    @fari35
    What is it you need beyond the Threaded Fortune Server Example ? How much are you based on that?

    F Offline
    F Offline
    fari35
    wrote on last edited by
    #19

    @JonB In this example it's not shown how to send the message to the client if the signal is emitted from the main thread like here I'm making a UI for the server so I want to send the message to the client as soon as the send button is clicked, but I don't know how to do it. I'm not even getting help from anywhere.

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    • Christian EhrlicherC Offline
      Christian EhrlicherC Offline
      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on last edited by
      #20

      Again: if you want to use thread (for whatever reason, maybe just to show that you're a famous programmer...), make sure you understand what you're doing and read the documentation and examples:

      "It is important to remember that a QThread instance lives in the old thread that instantiated it, not in the new thread that calls run(). This means that all of QThread's queued slots and invoked methods will execute in the old thread. Thus, a developer who wishes to invoke slots in the new thread must use the worker-object approach; new slots should not be implemented directly into a subclassed QThread."

      Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
      Visit the Qt Academy at https://academy.qt.io/catalog

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      • JKSHJ Offline
        JKSHJ Offline
        JKSH
        Moderators
        wrote on last edited by
        #21

        @fari35: To clarify the documentation quoted by @Christian-Ehrlicher's: Do not implement any slots in fthread. Instead, implement your slot in a separate QObject. Create that object together with tcpSocket.

        Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

        F 1 Reply Last reply
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        • JKSHJ JKSH

          @fari35: To clarify the documentation quoted by @Christian-Ehrlicher's: Do not implement any slots in fthread. Instead, implement your slot in a separate QObject. Create that object together with tcpSocket.

          F Offline
          F Offline
          fari35
          wrote on last edited by fari35
          #22

          @JKSH @Christian-Ehrlicher If I implement the slot in a separate Qobject then how can I send the data from that class as my TcpSocket is created in fthread class?
          My issue is same as this one :
          https://stackoverflow.com/questions/35927165/qt-multi-threaded-multi-client-tcp-server-socket-write-issue/65750692#65750692

          JKSHJ Christian EhrlicherC 2 Replies Last reply
          0
          • F fari35

            @JKSH @Christian-Ehrlicher If I implement the slot in a separate Qobject then how can I send the data from that class as my TcpSocket is created in fthread class?
            My issue is same as this one :
            https://stackoverflow.com/questions/35927165/qt-multi-threaded-multi-client-tcp-server-socket-write-issue/65750692#65750692

            JKSHJ Offline
            JKSHJ Offline
            JKSH
            Moderators
            wrote on last edited by
            #23

            @fari35 said in readyread() signal doesn't emit after sendmessage() signal on pushbutton:

            If I implement the slot in a separate Qobject then how can I send the data from that class as my TcpSocket is created in fthread class?

            Let's take a step back.

            Imagine that your server only needs to communicate with one client. Imagine that you have no threads; your QTcpSocket is in the main thread. How can you send data from a QObject to the socket?

            Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

            F 1 Reply Last reply
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            • JKSHJ JKSH

              @fari35 said in readyread() signal doesn't emit after sendmessage() signal on pushbutton:

              If I implement the slot in a separate Qobject then how can I send the data from that class as my TcpSocket is created in fthread class?

              Let's take a step back.

              Imagine that your server only needs to communicate with one client. Imagine that you have no threads; your QTcpSocket is in the main thread. How can you send data from a QObject to the socket?

              F Offline
              F Offline
              fari35
              wrote on last edited by
              #24

              @JKSH I'll simply create a QTcpSocket and then after initializing it I'll send the data to the client

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              • F fari35

                @JKSH @Christian-Ehrlicher If I implement the slot in a separate Qobject then how can I send the data from that class as my TcpSocket is created in fthread class?
                My issue is same as this one :
                https://stackoverflow.com/questions/35927165/qt-multi-threaded-multi-client-tcp-server-socket-write-issue/65750692#65750692

                Christian EhrlicherC Offline
                Christian EhrlicherC Offline
                Christian Ehrlicher
                Lifetime Qt Champion
                wrote on last edited by
                #25

                @fari35 said in readyread() signal doesn't emit after sendmessage() signal on pushbutton:

                If I implement the slot in a separate Qobject then how can I send the data from that class as my TcpSocket is created in fthread class?

                Did you actually ook at least once in the documentation. Hint: there is an example which describes how to properly create an object living in another thread and how to connect signals from/to them.

                Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
                Visit the Qt Academy at https://academy.qt.io/catalog

                A 1 Reply Last reply
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                • Christian EhrlicherC Christian Ehrlicher

                  @fari35 said in readyread() signal doesn't emit after sendmessage() signal on pushbutton:

                  If I implement the slot in a separate Qobject then how can I send the data from that class as my TcpSocket is created in fthread class?

                  Did you actually ook at least once in the documentation. Hint: there is an example which describes how to properly create an object living in another thread and how to connect signals from/to them.

                  A Offline
                  A Offline
                  Anonymous_Banned275
                  wrote on last edited by
                  #26

                  @Christian-Ehrlicher said in readyread() signal doesn't emit after sendmessage() signal on pushbutton:

                  Did you actually ook at least once in the documentation.

                  Perhaps if you throttle DOWN your nagging attitude a little ?
                  It seldom helps resolving TECHNICAL issue.
                  There seems to be few people perpetuating similar format recently , I am not particularly picking you.
                  Just saying.

                  1 Reply Last reply
                  -3
                  • Christian EhrlicherC Offline
                    Christian EhrlicherC Offline
                    Christian Ehrlicher
                    Lifetime Qt Champion
                    wrote on last edited by
                    #27

                    @AnneRanch said in readyread() signal doesn't emit after sendmessage() signal on pushbutton:

                    Perhaps if you throttle DOWN your nagging attitude a little ?

                    I simply don't understand how someone can ignore our hints the whole time and asking the same stuff over and over again. I already said in my first post here what's wrong and that threading is not that easy. So if it's not easy and I (ask someone who wants to learn) would read the documentation and study the examples to see how all is going.

                    Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
                    Visit the Qt Academy at https://academy.qt.io/catalog

                    A 1 Reply Last reply
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                    • Christian EhrlicherC Christian Ehrlicher

                      @AnneRanch said in readyread() signal doesn't emit after sendmessage() signal on pushbutton:

                      Perhaps if you throttle DOWN your nagging attitude a little ?

                      I simply don't understand how someone can ignore our hints the whole time and asking the same stuff over and over again. I already said in my first post here what's wrong and that threading is not that easy. So if it's not easy and I (ask someone who wants to learn) would read the documentation and study the examples to see how all is going.

                      A Offline
                      A Offline
                      Anonymous_Banned275
                      wrote on last edited by
                      #28

                      @Christian-Ehrlicher said in readyread() signal doesn't emit after sendmessage() signal on pushbutton:

                      don't understand how someone can ignore our hints

                      I simply do not want to get into social analysis why people, in general , should be chastised, in any format , for their not choosing / following " our hints" or our opinions.

                      If you have a issue with that - you do have a choice NOT to participate - if that bothers you that much.

                      Cheers

                      PS
                      I used to call people who do not respond or follow advises "shooting star" . They generally only post once and then find a more rewarding means to entertain themselves .

                      End of rant

                      1 Reply Last reply
                      -2

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