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SOS:undefined reference to `vtable for<class name>

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  • J jsulm
    14 Jun 2018, 05:09

    @qazaq408 But how did you add the Dialog class? Manually?

    Q Offline
    Q Offline
    qazaq408
    wrote on 14 Jun 2018, 05:21 last edited by
    #8

    @jsulm
    alt text
    alt text
    alt text
    alt text

    1 Reply Last reply
    0
    • Q Offline
      Q Offline
      qazaq408
      wrote on 14 Jun 2018, 07:11 last edited by
      #9

      I'm only one who use Qt in my company.....
      I cast two days on this queston and can't do anything..
      My Boss Is angry ....
      Who can help me.....

      1 Reply Last reply
      0
      • V Offline
        V Offline
        VRonin
        wrote on 14 Jun 2018, 07:15 last edited by
        #10

        Delete the build folder and re-run qmake. your code is fine

        "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
        ~Napoleon Bonaparte

        On a crusade to banish setIndexWidget() from the holy land of Qt

        1 Reply Last reply
        5
        • Q Offline
          Q Offline
          qazaq408
          wrote on 15 Jun 2018, 01:20 last edited by
          #11

          I get more infomation by google...
          I try puoduce Moc file by moc tools
          moc doc.h -o Moc_doc.cpp
          but system always tell me "F:\doc\Doc\Doc.h:1: Note: No relevant classes found. No output generated."
          I change the encode of .h file by notepad++,whatever I use utf-8 or ansi,It doesn't work.
          alt text

          J 1 Reply Last reply 15 Jun 2018, 04:19
          0
          • Q qazaq408
            15 Jun 2018, 01:20

            I get more infomation by google...
            I try puoduce Moc file by moc tools
            moc doc.h -o Moc_doc.cpp
            but system always tell me "F:\doc\Doc\Doc.h:1: Note: No relevant classes found. No output generated."
            I change the encode of .h file by notepad++,whatever I use utf-8 or ansi,It doesn't work.
            alt text

            J Offline
            J Offline
            jsulm
            Lifetime Qt Champion
            wrote on 15 Jun 2018, 04:19 last edited by
            #12

            @qazaq408 Can you show your pro file?

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

            Q 1 Reply Last reply 15 Jun 2018, 04:34
            0
            • J jsulm
              15 Jun 2018, 04:19

              @qazaq408 Can you show your pro file?

              Q Offline
              Q Offline
              qazaq408
              wrote on 15 Jun 2018, 04:34 last edited by
              #13

              @jsulm

              #-------------------------------------------------
              #
              # Project created by QtCreator 2018-06-13T12:39:42
              #
              #-------------------------------------------------
              
              QT       += core gui
              
              greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
              
              TARGET = MocTest
              TEMPLATE = app
              
              # The following define makes your compiler emit warnings if you use
              # any feature of Qt which has been marked as deprecated (the exact warnings
              # depend on your compiler). Please consult the documentation of the
              # deprecated API in order to know how to port your code away from it.
              DEFINES += QT_DEPRECATED_WARNINGS
              
              # You can also make your code fail to compile if you use deprecated APIs.
              # In order to do so, uncomment the following line.
              # You can also select to disable deprecated APIs only up to a certain version of Qt.
              #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
              
              
              SOURCES += \
                      main.cpp \
                      MocTest.cpp
              
              HEADERS += \
                      MocTest.h
              

              The .h and .cpp file one the 3th floor

              J 1 Reply Last reply 15 Jun 2018, 04:36
              0
              • Q qazaq408
                15 Jun 2018, 04:34

                @jsulm

                #-------------------------------------------------
                #
                # Project created by QtCreator 2018-06-13T12:39:42
                #
                #-------------------------------------------------
                
                QT       += core gui
                
                greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
                
                TARGET = MocTest
                TEMPLATE = app
                
                # The following define makes your compiler emit warnings if you use
                # any feature of Qt which has been marked as deprecated (the exact warnings
                # depend on your compiler). Please consult the documentation of the
                # deprecated API in order to know how to port your code away from it.
                DEFINES += QT_DEPRECATED_WARNINGS
                
                # You can also make your code fail to compile if you use deprecated APIs.
                # In order to do so, uncomment the following line.
                # You can also select to disable deprecated APIs only up to a certain version of Qt.
                #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
                
                
                SOURCES += \
                        main.cpp \
                        MocTest.cpp
                
                HEADERS += \
                        MocTest.h
                

                The .h and .cpp file one the 3th floor

                J Offline
                J Offline
                jsulm
                Lifetime Qt Champion
                wrote on 15 Jun 2018, 04:36 last edited by
                #14

                @qazaq408 Does MocTest.* contain your Dialog class?

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

                Q 1 Reply Last reply 15 Jun 2018, 04:44
                0
                • J jsulm
                  15 Jun 2018, 04:36

                  @qazaq408 Does MocTest.* contain your Dialog class?

                  Q Offline
                  Q Offline
                  qazaq408
                  wrote on 15 Jun 2018, 04:44 last edited by
                  #15

                  @jsulm
                  no,My class name "MocTest; and "MocTest" class inheriten QDialog
                  and I write class declaration inthe .h file,wirte class definition in .cpp file

                  .h file

                  #ifndef DIALOG_H
                  #define DIALOG_H
                  
                  #include <QDialog>
                  
                  class Dialog : public QDialog
                  {
                      Q_OBJECT
                  
                  public:
                      Dialog(QWidget *parent = 0);
                      ~Dialog();
                  };
                  
                  #endif // DIALOG_H
                  

                  .cpp file

                  #include "Dialog.h"
                  
                  Dialog::Dialog(QWidget *parent)
                      : QDialog(parent)
                  {
                  }
                  
                  Dialog::~Dialog()
                  {
                  
                  }
                  
                  Q 1 Reply Last reply 15 Jun 2018, 04:46
                  0
                  • Q qazaq408
                    15 Jun 2018, 04:44

                    @jsulm
                    no,My class name "MocTest; and "MocTest" class inheriten QDialog
                    and I write class declaration inthe .h file,wirte class definition in .cpp file

                    .h file

                    #ifndef DIALOG_H
                    #define DIALOG_H
                    
                    #include <QDialog>
                    
                    class Dialog : public QDialog
                    {
                        Q_OBJECT
                    
                    public:
                        Dialog(QWidget *parent = 0);
                        ~Dialog();
                    };
                    
                    #endif // DIALOG_H
                    

                    .cpp file

                    #include "Dialog.h"
                    
                    Dialog::Dialog(QWidget *parent)
                        : QDialog(parent)
                    {
                    }
                    
                    Dialog::~Dialog()
                    {
                    
                    }
                    
                    Q Offline
                    Q Offline
                    qazaq408
                    wrote on 15 Jun 2018, 04:46 last edited by
                    #16

                    @qazaq408 said in SOS:undefined reference to `vtable for<class name>:

                    @jsulm
                    no,My class name "MocTest; and "MocTest" class inheriten QDialog
                    and I write class declaration inthe .h file,wirte class definition in .cpp file

                    .h file

                    #ifndef DIALOG_H
                    #define DIALOG_H
                    
                    #include <QDialog>
                    
                    class MocTest : public QDialog
                    {
                        Q_OBJECT
                    
                    public:
                        MocTest(QWidget *parent = 0);
                        ~MocTest();
                    };
                    
                    #endif // DIALOG_H
                    

                    .cpp file

                    #include "MocTest.h"
                    
                    MocTest::MocTest(QWidget *parent)
                        : QDialog(parent)
                    {
                    }
                    
                    MocTest::~MocTest()
                    {
                    
                    }
                    
                    J 1 Reply Last reply 15 Jun 2018, 05:09
                    0
                    • Q qazaq408
                      15 Jun 2018, 04:46

                      @qazaq408 said in SOS:undefined reference to `vtable for<class name>:

                      @jsulm
                      no,My class name "MocTest; and "MocTest" class inheriten QDialog
                      and I write class declaration inthe .h file,wirte class definition in .cpp file

                      .h file

                      #ifndef DIALOG_H
                      #define DIALOG_H
                      
                      #include <QDialog>
                      
                      class MocTest : public QDialog
                      {
                          Q_OBJECT
                      
                      public:
                          MocTest(QWidget *parent = 0);
                          ~MocTest();
                      };
                      
                      #endif // DIALOG_H
                      

                      .cpp file

                      #include "MocTest.h"
                      
                      MocTest::MocTest(QWidget *parent)
                          : QDialog(parent)
                      {
                      }
                      
                      MocTest::~MocTest()
                      {
                      
                      }
                      
                      J Offline
                      J Offline
                      J.Hilk
                      Moderators
                      wrote on 15 Jun 2018, 05:09 last edited by
                      #17

                      @qazaq408 said in SOS:undefined reference to `vtable for<class name>:
                      somthing strange is going on, did you create the class files yourself? because the declaration guards are QtNorming conform and indicate file names of dialog.h and dialog.cpp

                      #ifndef DIALOG_H
                      #define DIALOG_H

                      you didn't just write

                      SOURCES += MocTest.cpp
                      

                      because you named your class MocTest, and the file itself is named dialog.cpp, right?

                      Just made a basic test program and works fine, as expected:

                      //*pro
                      #-------------------------------------------------
                      #
                      # Project created by QtCreator 2018-06-15T07:01:09
                      #
                      #-------------------------------------------------
                      
                      QT       += core gui
                      
                      greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
                      
                      TARGET = MocTest
                      TEMPLATE = app
                      
                      # The following define makes your compiler emit warnings if you use
                      # any feature of Qt which has been marked as deprecated (the exact warnings
                      # depend on your compiler). Please consult the documentation of the
                      # deprecated API in order to know how to port your code away from it.
                      DEFINES += QT_DEPRECATED_WARNINGS
                      
                      # You can also make your code fail to compile if you use deprecated APIs.
                      # In order to do so, uncomment the following line.
                      # You can also select to disable deprecated APIs only up to a certain version of Qt.
                      #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
                      
                      
                      SOURCES += \
                              main.cpp \
                          moctest.cpp
                      
                      HEADERS += \
                              mainwindow.h \
                          moctest.h
                      
                      
                      //main.cpp
                      #include "moctest.h"
                      #include <QApplication>
                      
                      int main(int argc, char *argv[])
                      {
                          QApplication a(argc, argv);
                      
                          MocTest test;
                          test.show();
                          return a.exec();
                      }
                      
                      
                      //moctest.h
                      #ifndef MOCTEST_H
                      #define MOCTEST_H
                      
                      #include <QDialog>
                      
                      class MocTest : public QDialog
                      {
                          Q_OBJECT
                      
                      public:
                          explicit MocTest(QDialog *parent = 0);
                      };
                      
                      #endif // MOCTEST_H
                      
                      //MocTest.cpp
                      #include "moctest.h"
                      
                      MocTest::MocTest(QDialog *parent) : QDialog(parent)
                      {
                      
                      }
                      
                      

                      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.

                      Q 2 Replies Last reply 15 Jun 2018, 05:23
                      1
                      • J J.Hilk
                        15 Jun 2018, 05:09

                        @qazaq408 said in SOS:undefined reference to `vtable for<class name>:
                        somthing strange is going on, did you create the class files yourself? because the declaration guards are QtNorming conform and indicate file names of dialog.h and dialog.cpp

                        #ifndef DIALOG_H
                        #define DIALOG_H

                        you didn't just write

                        SOURCES += MocTest.cpp
                        

                        because you named your class MocTest, and the file itself is named dialog.cpp, right?

                        Just made a basic test program and works fine, as expected:

                        //*pro
                        #-------------------------------------------------
                        #
                        # Project created by QtCreator 2018-06-15T07:01:09
                        #
                        #-------------------------------------------------
                        
                        QT       += core gui
                        
                        greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
                        
                        TARGET = MocTest
                        TEMPLATE = app
                        
                        # The following define makes your compiler emit warnings if you use
                        # any feature of Qt which has been marked as deprecated (the exact warnings
                        # depend on your compiler). Please consult the documentation of the
                        # deprecated API in order to know how to port your code away from it.
                        DEFINES += QT_DEPRECATED_WARNINGS
                        
                        # You can also make your code fail to compile if you use deprecated APIs.
                        # In order to do so, uncomment the following line.
                        # You can also select to disable deprecated APIs only up to a certain version of Qt.
                        #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
                        
                        
                        SOURCES += \
                                main.cpp \
                            moctest.cpp
                        
                        HEADERS += \
                                mainwindow.h \
                            moctest.h
                        
                        
                        //main.cpp
                        #include "moctest.h"
                        #include <QApplication>
                        
                        int main(int argc, char *argv[])
                        {
                            QApplication a(argc, argv);
                        
                            MocTest test;
                            test.show();
                            return a.exec();
                        }
                        
                        
                        //moctest.h
                        #ifndef MOCTEST_H
                        #define MOCTEST_H
                        
                        #include <QDialog>
                        
                        class MocTest : public QDialog
                        {
                            Q_OBJECT
                        
                        public:
                            explicit MocTest(QDialog *parent = 0);
                        };
                        
                        #endif // MOCTEST_H
                        
                        //MocTest.cpp
                        #include "moctest.h"
                        
                        MocTest::MocTest(QDialog *parent) : QDialog(parent)
                        {
                        
                        }
                        
                        
                        Q Offline
                        Q Offline
                        qazaq408
                        wrote on 15 Jun 2018, 05:23 last edited by
                        #18

                        @J.Hilk
                        I make a mistake when i reply...I'm in a hurry because my boss is kicking my ass....

                        my class name "MocTest",it's inheriten QDialog,and "MocTest" class is writed in MocTest.h and MocTest,cpp

                        aha_1980A 1 Reply Last reply 15 Jun 2018, 05:52
                        0
                        • Q qazaq408
                          15 Jun 2018, 05:23

                          @J.Hilk
                          I make a mistake when i reply...I'm in a hurry because my boss is kicking my ass....

                          my class name "MocTest",it's inheriten QDialog,and "MocTest" class is writed in MocTest.h and MocTest,cpp

                          aha_1980A Offline
                          aha_1980A Offline
                          aha_1980
                          Lifetime Qt Champion
                          wrote on 15 Jun 2018, 05:52 last edited by
                          #19

                          @qazaq408

                          I have two suggestions for you:

                          1. Create a completely new project from QtCreators wizards and see if you can compile it. Then add a dialog (also with the wizard) and see if it still works. If not, than something may be wrong with your setup.
                          2. Upload your complete project somewhere so we can test it.

                          Regards

                          Qt has to stay free or it will die.

                          1 Reply Last reply
                          0
                          • J J.Hilk
                            15 Jun 2018, 05:09

                            @qazaq408 said in SOS:undefined reference to `vtable for<class name>:
                            somthing strange is going on, did you create the class files yourself? because the declaration guards are QtNorming conform and indicate file names of dialog.h and dialog.cpp

                            #ifndef DIALOG_H
                            #define DIALOG_H

                            you didn't just write

                            SOURCES += MocTest.cpp
                            

                            because you named your class MocTest, and the file itself is named dialog.cpp, right?

                            Just made a basic test program and works fine, as expected:

                            //*pro
                            #-------------------------------------------------
                            #
                            # Project created by QtCreator 2018-06-15T07:01:09
                            #
                            #-------------------------------------------------
                            
                            QT       += core gui
                            
                            greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
                            
                            TARGET = MocTest
                            TEMPLATE = app
                            
                            # The following define makes your compiler emit warnings if you use
                            # any feature of Qt which has been marked as deprecated (the exact warnings
                            # depend on your compiler). Please consult the documentation of the
                            # deprecated API in order to know how to port your code away from it.
                            DEFINES += QT_DEPRECATED_WARNINGS
                            
                            # You can also make your code fail to compile if you use deprecated APIs.
                            # In order to do so, uncomment the following line.
                            # You can also select to disable deprecated APIs only up to a certain version of Qt.
                            #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
                            
                            
                            SOURCES += \
                                    main.cpp \
                                moctest.cpp
                            
                            HEADERS += \
                                    mainwindow.h \
                                moctest.h
                            
                            
                            //main.cpp
                            #include "moctest.h"
                            #include <QApplication>
                            
                            int main(int argc, char *argv[])
                            {
                                QApplication a(argc, argv);
                            
                                MocTest test;
                                test.show();
                                return a.exec();
                            }
                            
                            
                            //moctest.h
                            #ifndef MOCTEST_H
                            #define MOCTEST_H
                            
                            #include <QDialog>
                            
                            class MocTest : public QDialog
                            {
                                Q_OBJECT
                            
                            public:
                                explicit MocTest(QDialog *parent = 0);
                            };
                            
                            #endif // MOCTEST_H
                            
                            //MocTest.cpp
                            #include "moctest.h"
                            
                            MocTest::MocTest(QDialog *parent) : QDialog(parent)
                            {
                            
                            }
                            
                            
                            Q Offline
                            Q Offline
                            qazaq408
                            wrote on 15 Jun 2018, 05:53 last edited by
                            #20

                            @J.Hilk
                            I guess that's is the point, MOC tools can't prduce moc*.cpp file
                            alt text
                            But I don't know why .
                            the almost answer in google is that the encode of file is wrong,qt need utf-8,but i change the encode of .h file by vs and notepad++, it still don't work...

                            aha_1980A 1 Reply Last reply 15 Jun 2018, 05:55
                            0
                            • Q qazaq408
                              15 Jun 2018, 05:53

                              @J.Hilk
                              I guess that's is the point, MOC tools can't prduce moc*.cpp file
                              alt text
                              But I don't know why .
                              the almost answer in google is that the encode of file is wrong,qt need utf-8,but i change the encode of .h file by vs and notepad++, it still don't work...

                              aha_1980A Offline
                              aha_1980A Offline
                              aha_1980
                              Lifetime Qt Champion
                              wrote on 15 Jun 2018, 05:55 last edited by aha_1980
                              #21

                              @qazaq408 said in SOS:undefined reference to `vtable for<class name>:

                              I guess that's is the point, MOC tools can't prduce moc*.cpp file

                              Then please do clean all build artefacts, and then compile your project. Paste the compile log here for analysis.

                              PS: Also make sure that there are no Makefile, *.moc, *.o and other generated files in your source directory! This will lead to the strangest effects possible.

                              Qt has to stay free or it will die.

                              Q 1 Reply Last reply 15 Jun 2018, 06:14
                              0
                              • aha_1980A aha_1980
                                15 Jun 2018, 05:55

                                @qazaq408 said in SOS:undefined reference to `vtable for<class name>:

                                I guess that's is the point, MOC tools can't prduce moc*.cpp file

                                Then please do clean all build artefacts, and then compile your project. Paste the compile log here for analysis.

                                PS: Also make sure that there are no Makefile, *.moc, *.o and other generated files in your source directory! This will lead to the strangest effects possible.

                                Q Offline
                                Q Offline
                                qazaq408
                                wrote on 15 Jun 2018, 06:14 last edited by
                                #22

                                @aha_1980
                                I had done this....
                                even I cpoy these three file (Moctst.h,MocTest.cpp,Main.cpp) to another dir,like E:/tk

                                and use cmd.exe
                                /////
                                e:
                                cd ./tk
                                moc MocTest.h -o Moc_MocTest.cpp

                                the system tell me .E:\tk\MocTest.h:1: Note: No relevant classes found. No output generated....

                                J 1 Reply Last reply 15 Jun 2018, 06:20
                                0
                                • Q qazaq408
                                  15 Jun 2018, 06:14

                                  @aha_1980
                                  I had done this....
                                  even I cpoy these three file (Moctst.h,MocTest.cpp,Main.cpp) to another dir,like E:/tk

                                  and use cmd.exe
                                  /////
                                  e:
                                  cd ./tk
                                  moc MocTest.h -o Moc_MocTest.cpp

                                  the system tell me .E:\tk\MocTest.h:1: Note: No relevant classes found. No output generated....

                                  J Offline
                                  J Offline
                                  jsulm
                                  Lifetime Qt Champion
                                  wrote on 15 Jun 2018, 06:20 last edited by
                                  #23

                                  @qazaq408 Don't copy anything, just create a new project and add there a new dialog and see whether it works.

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

                                  Q 1 Reply Last reply 15 Jun 2018, 06:30
                                  0
                                  • J jsulm
                                    15 Jun 2018, 06:20

                                    @qazaq408 Don't copy anything, just create a new project and add there a new dialog and see whether it works.

                                    Q Offline
                                    Q Offline
                                    qazaq408
                                    wrote on 15 Jun 2018, 06:30 last edited by JKSH
                                    #24

                                    @jsulm
                                    if I create a new object that has a new dialog,(I don't revise anything and the class with Q_OBJECT marco),and make,
                                    system tell me
                                    alt text

                                    and if i delete Q_OBJECT marco,it works ,but still has a question
                                    alt text

                                    JKSHJ 1 Reply Last reply 15 Jun 2018, 07:17
                                    0
                                    • Q qazaq408
                                      15 Jun 2018, 06:30

                                      @jsulm
                                      if I create a new object that has a new dialog,(I don't revise anything and the class with Q_OBJECT marco),and make,
                                      system tell me
                                      alt text

                                      and if i delete Q_OBJECT marco,it works ,but still has a question
                                      alt text

                                      JKSHJ Offline
                                      JKSHJ Offline
                                      JKSH
                                      Moderators
                                      wrote on 15 Jun 2018, 07:17 last edited by
                                      #25

                                      @qazaq408

                                      1. Restart your PC
                                      2. Open Qt Creator
                                      3. In the "Welcome" screen, click "Examples"
                                      4. Search for the "Address Book Example"
                                      5. Try to run this example

                                      What do you see?

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

                                      1 Reply Last reply
                                      0
                                      • Q Offline
                                        Q Offline
                                        qazaq408
                                        wrote on 15 Jun 2018, 08:16 last edited by
                                        #26

                                        I take it...my company systm file are encrypted so that add some question when Qt produce .o file. I run win7 in the vritulBox and it's work!!!!!

                                        Thank brother Chun,
                                        Thank god
                                        Thank everyone who help me or not,thank you cost so much time to answer my question.

                                        thank you!!

                                        1 Reply Last reply
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