Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. It does not create a chart
Forum Updated to NodeBB v4.3 + New Features

It does not create a chart

Scheduled Pinned Locked Moved Unsolved General and Desktop
qt5chartthread
14 Posts 3 Posters 1.6k Views 1 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #4

    That queue variable belongs to your mythread class. It's not the same as the one from your MainWindow class even if it has the same name.

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

    D 1 Reply Last reply
    1
    • SGaistS SGaist

      That queue variable belongs to your mythread class. It's not the same as the one from your MainWindow class even if it has the same name.

      D Offline
      D Offline
      deleted286
      wrote on last edited by
      #5

      @SGaist can i connect them, or what can i do for this problem? I read and write in mythread.cpp
      If i move initChartView and timer_slot, is it true?

      1 Reply Last reply
      0
      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #6

        @suslucoder said in It does not create a chart:

        If i move initChartView and timer_slot, is it true?

        It won't change anything as these two variables will still be unrelated.

        @suslucoder said in It does not create a chart:

        can i connect them, or what can i do for this problem? I read and write in mythread.cpp

        You have to get the data from your mythread object back to your MainWindow.

        As I already suggested, you really should start with C++ basics before playing with threading.

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

        D 1 Reply Last reply
        1
        • SGaistS SGaist

          @suslucoder said in It does not create a chart:

          If i move initChartView and timer_slot, is it true?

          It won't change anything as these two variables will still be unrelated.

          @suslucoder said in It does not create a chart:

          can i connect them, or what can i do for this problem? I read and write in mythread.cpp

          You have to get the data from your mythread object back to your MainWindow.

          As I already suggested, you really should start with C++ basics before playing with threading.

          D Offline
          D Offline
          deleted286
          wrote on last edited by
          #7

          @SGaist said in It does not create a chart:

          You have to get the data from your mythread object back to your MainWindow.

          What is the way for getting datas from mythread to my mainwindow? I would be very happy if you could show me the way

          1 Reply Last reply
          0
          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #8

            Use a signal to transfer the queue. Make it a const reference.

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

            D 1 Reply Last reply
            1
            • SGaistS SGaist

              Use a signal to transfer the queue. Make it a const reference.

              D Offline
              D Offline
              deleted286
              wrote on last edited by
              #9

              @SGaist can you show me an example? I did not understand

              1 Reply Last reply
              0
              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #10

                What did you not understand ?

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

                D 1 Reply Last reply
                0
                • SGaistS SGaist

                  What did you not understand ?

                  D Offline
                  D Offline
                  deleted286
                  wrote on last edited by
                  #11

                  @SGaist if my slot is my queue, what should be the signal. I didnt understand it.

                  1 Reply Last reply
                  0
                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #12

                    Your slot is not your queue. Did you read the chapter about signals and slots ?

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

                    D 1 Reply Last reply
                    0
                    • SGaistS SGaist

                      Your slot is not your queue. Did you read the chapter about signals and slots ?

                      D Offline
                      D Offline
                      deleted286
                      wrote on last edited by
                      #13

                      @SGaist yes i did. But i cannot understand how can i get datas

                      jsulmJ 1 Reply Last reply
                      0
                      • D deleted286

                        @SGaist yes i did. But i cannot understand how can i get datas

                        jsulmJ Offline
                        jsulmJ Offline
                        jsulm
                        Lifetime Qt Champion
                        wrote on last edited by
                        #14

                        @suslucoder What exactly can't you understand? In the documentation @SGaist posted there is even an example with signal/slot with parameter...

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

                        1 Reply Last reply
                        0

                        • Login

                        • Login or register to search.
                        • First post
                          Last post
                        0
                        • Categories
                        • Recent
                        • Tags
                        • Popular
                        • Users
                        • Groups
                        • Search
                        • Get Qt Extensions
                        • Unsolved