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QList<const QBluetoothDeviceInfo* declaration / definiton problem

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  • J.HilkJ J.Hilk

    I think the case is pretty clear,

    QList<const QBluetoothDeviceInfo* > RemoteDeviceInfo; expects a heap allocated QBluetoothDeviceInfo instance

    RemoteDeviceInfo.append(&info); info is a local function scoped stack allocated instance of QBluetoothDeviceInfo instance.

    this is a different scoped function

    void SettingsDialog::on_applyButton_11_clicked()
    {
    text = " DEBUG TEST Direct access ";
    text += RemoteDeviceInfo.at(0)->name();
    qDebug()<< text;
    return;
    

    trying to access the now destructed info instance.

    Very likely, but we will never know for sure.

    A Offline
    A Offline
    Anonymous_Banned275
    wrote on last edited by
    #38

    @J-Hilk Would it be too offensive to ask you to discuss this ?
    PS I do not get notified about new posts so it may take a few days before I ;ll read your reply.

    Pl45m4P J.HilkJ 2 Replies Last reply
    0
    • A Anonymous_Banned275

      @J-Hilk Would it be too offensive to ask you to discuss this ?
      PS I do not get notified about new posts so it may take a few days before I ;ll read your reply.

      Pl45m4P Offline
      Pl45m4P Offline
      Pl45m4
      wrote on last edited by Pl45m4
      #39

      @AnneRanch said in QList<const QBluetoothDeviceInfo* declaration / definiton problem:

      Would it be too offensive to ask you to discuss this ?

      What do you want to discuss? Whether the documentation is lying?
      You should not copy QObject.

      Everything else, you can copy/use copy c'tors, as it's just standard C++ language and not "Qt".


      If debugging is the process of removing software bugs, then programming must be the process of putting them in.

      ~E. W. Dijkstra

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      • Pl45m4P Pl45m4

        @AnneRanch said in QList<const QBluetoothDeviceInfo* declaration / definiton problem:

        Would it be too offensive to ask you to discuss this ?

        What do you want to discuss? Whether the documentation is lying?
        You should not copy QObject.

        Everything else, you can copy/use copy c'tors, as it's just standard C++ language and not "Qt".

        A Offline
        A Offline
        Anonymous_Banned275
        wrote on last edited by
        #40

        @Pl45m4 I was looking for alternative way to make a copy of "info" and I got it solved. CLOSED

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        • A Anonymous_Banned275

          @J-Hilk Would it be too offensive to ask you to discuss this ?
          PS I do not get notified about new posts so it may take a few days before I ;ll read your reply.

          J.HilkJ Offline
          J.HilkJ Offline
          J.Hilk
          Moderators
          wrote on last edited by
          #41

          @AnneRanch said in QList<const QBluetoothDeviceInfo* declaration / definiton problem:

          @J-Hilk Would it be too offensive to ask you to discuss this ?

          No, of course not, open discourse is one of the fundamentals of society.

          @AnneRanch said in QList<const QBluetoothDeviceInfo* declaration / definiton problem:

          @Pl45m4 I was looking for alternative way to make a copy of "info" and I got it solved. CLOSED

          I'm curious on what you now ended up using! But for your information I wanted to point out, that you can click on the cog symbol on your opening post and actually select "Mark topic as solved". Alternatively, if you think that one answer in particular solved your issue, you can mark that answer as the correct one.


          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.

          A 1 Reply Last reply
          1
          • J.HilkJ J.Hilk

            @AnneRanch said in QList<const QBluetoothDeviceInfo* declaration / definiton problem:

            @J-Hilk Would it be too offensive to ask you to discuss this ?

            No, of course not, open discourse is one of the fundamentals of society.

            @AnneRanch said in QList<const QBluetoothDeviceInfo* declaration / definiton problem:

            @Pl45m4 I was looking for alternative way to make a copy of "info" and I got it solved. CLOSED

            I'm curious on what you now ended up using! But for your information I wanted to point out, that you can click on the cog symbol on your opening post and actually select "Mark topic as solved". Alternatively, if you think that one answer in particular solved your issue, you can mark that answer as the correct one.

            A Offline
            A Offline
            Anonymous_Banned275
            wrote on last edited by
            #42

            @J-Hilk

            Currently I just add "info" to struct - class variable and pass "info" to another function for( partial) processing.
            I am still not sure if I can process multiple SIGNAL.

            Here is a code snippet. PLEASE keep in mind it is a code under construction and I like to keep old code so I do not duplicate and of course I use QDebug extensively.
            I am posting the cope "as is " PLEASE do not tell me it does not compile.

                   void SettingsDialog::addDevice(const QBluetoothDeviceInfo &info)
                   {
                       // //*BT_Database_Array[16];
                       //HERE
                       BT_Database_Array[Array_Index].BT_INFO_Address = info.address();
                       BT_Database_Array[Array_Index].INFO_Name = info.name();
            
                       //Array_Index++;
                       //#endif
                       //temporary copy to QString
                       INFO_Name = info.name();
                       BT_Database.INFO_Name = info.name();
                       BT_Database.INFO_Address = info.address().toString();
                       // verify name
                       text = " TASK  verify name";
                       text += BT_Database_Array[Array_Index].INFO_Name;
            #ifdef DEBUG_TASK_SCAN
                       qDebug()<< text;
            #endif
                       text= "Read info ";
                       text += " name ";
                       text += info.name();
                       text += " address ";
                       text += info.address().toString();
            
            #ifdef DEBUG_TASK_SCAN
                       qDebug()<< text;
            #endif
            
                       // verify address
                       text = " TASK  verify address";
                       text += BT_Database_Array[Array_Index].BT_INFO_Address.toString();
            #ifdef DEBUG_TASK_PAIRING
                       qDebug()<< text;
            #endif
            
                       //Pairing_verify(0);
                       Pairing_verify(0, info);
            
            
            1 Reply Last reply
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            • Axel SpoerlA Axel Spoerl

              PS Do I understand it correctly - QT does not have "copy constructor " ?

              Goodness, no. Of course we have.

              A Offline
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              Anonymous_Banned275
              wrote on last edited by
              #43

              @Axel-Spoerl Hello sir, I wonder if I could ask you a favor which
              would be immensely helpful in using QT.
              I am looking forward to your reply.
              Thanks
              Cheers

              Axel SpoerlA 1 Reply Last reply
              0
              • A Anonymous_Banned275

                @Axel-Spoerl Hello sir, I wonder if I could ask you a favor which
                would be immensely helpful in using QT.
                I am looking forward to your reply.
                Thanks
                Cheers

                Axel SpoerlA Offline
                Axel SpoerlA Offline
                Axel Spoerl
                Moderators
                wrote on last edited by
                #44

                @AnneRanch
                Feeling honored to be addressed aristocraticly :-)
                Just ask!

                Software Engineer
                The Qt Company, Oslo

                A 1 Reply Last reply
                1
                • Axel SpoerlA Axel Spoerl

                  @AnneRanch
                  Feeling honored to be addressed aristocraticly :-)
                  Just ask!

                  A Offline
                  A Offline
                  Anonymous_Banned275
                  wrote on last edited by
                  #45

                  @Axel-Spoerl OK - here it comes

                  is there a written document (QT ) describing how to setup QT to
                  compile ONCE ?

                  There are options but I must have them set incorrectly - "typical" user error...

                  I have a growing "subdirs" project and when I do "rebuild" and then "run" or "debug" it will compile again - without me doing any editing.

                  Same when I do edit , then "run " and "run" again, it compiles again , without me doing any more editing.

                  This redundant recompile is beginning to take more and more of my precious time ... I could spent with my grand kids instead ...

                  I had posted a bug report but got no solution.

                  Axel SpoerlA 1 Reply Last reply
                  0
                  • A Anonymous_Banned275

                    @Axel-Spoerl OK - here it comes

                    is there a written document (QT ) describing how to setup QT to
                    compile ONCE ?

                    There are options but I must have them set incorrectly - "typical" user error...

                    I have a growing "subdirs" project and when I do "rebuild" and then "run" or "debug" it will compile again - without me doing any editing.

                    Same when I do edit , then "run " and "run" again, it compiles again , without me doing any more editing.

                    This redundant recompile is beginning to take more and more of my precious time ... I could spent with my grand kids instead ...

                    I had posted a bug report but got no solution.

                    Axel SpoerlA Offline
                    Axel SpoerlA Offline
                    Axel Spoerl
                    Moderators
                    wrote on last edited by
                    #46

                    @AnneRanch
                    I guess this is worth a thread of its own.
                    Generally, it is not the intention for Qt Creator to always recompile.
                    If the project is configured correctly, what you describe should not happen.
                    Troubleshooting depends on whether you use qmake or cmake.
                    Both build systems check time stamps to determine if a build tree is dirty and needs compilation.

                    Typical constellations that trigger rebuilding are

                    • git pull or git rebase in the source tree
                    • a build step in Qt Creator that triggers a cleanup before building
                    • broken subdir configuration

                    Suggest you post your subdir structure and cmake / .pro files in a separate thread.

                    Software Engineer
                    The Qt Company, Oslo

                    A 1 Reply Last reply
                    0
                    • Axel SpoerlA Axel Spoerl

                      @AnneRanch
                      I guess this is worth a thread of its own.
                      Generally, it is not the intention for Qt Creator to always recompile.
                      If the project is configured correctly, what you describe should not happen.
                      Troubleshooting depends on whether you use qmake or cmake.
                      Both build systems check time stamps to determine if a build tree is dirty and needs compilation.

                      Typical constellations that trigger rebuilding are

                      • git pull or git rebase in the source tree
                      • a build step in Qt Creator that triggers a cleanup before building
                      • broken subdir configuration

                      Suggest you post your subdir structure and cmake / .pro files in a separate thread.

                      A Offline
                      A Offline
                      Anonymous_Banned275
                      wrote on last edited by
                      #47

                      @Axel-Spoerl Thanks , I did post "sarcastic" ...." it compiles" in "the lounge".

                      Maybe I could ask for it to be moved .....

                      and do as you suggested after

                      1 Reply Last reply
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