Error: undefined reference to `vtable for <class>'

Dropye

Hey there,

I searched a bit to find a solution by myself but cant find anything what is solving my problem.

I work on this Project for 4 weeks now and today it suddenly stopped compiling proberly.

This is the full error I get:

bq. D:\Qt\Tools\QtCreator\bin\SE_Beleg\SE_Beleg\View\source\dialog_mainlehr.cpp:3: Fehler: undefined reference to vtable for Dialog_MainLehr' D:\Qt\Tools\QtCreator\bin\SE_Beleg\SE_Beleg\View\source\dialog_mainlehr.cpp:3: Fehler: undefined reference tovtable for Dialog_MainLehr'

collect2.exe:-1: Fehler: error: ld returned 1 exit status

And this are my files:

.pro
@#-------------------------------------------------

Project created by QtCreator 2014-05-28T12:54:33

#-------------------------------------------------

QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = SE_Beleg
TEMPLATE = app

SOURCES += View/source/main.cpp
View/source/dialog_mainansicht.cpp
View/source/dialog_mainstudent.cpp
View/source/dialog_gruppeanlegen.cpp
View/source/dialog_about.cpp
View/source/dialog_msg.cpp
View/source/dialog_mainlehr.cpp
View/source/dialog_login.cpp

HEADERS += View/header/dialog_mainansicht.h
View/header/dialog_mainstudent.h
View/header/dialog_gruppeanlegen.h
View/header/dialog_about.h
View/header/dialog_msg.h
View/header/dialog_mainlehr.h
View/header/dialog_login.h
Controller/Archiv.h
Controller/Belegarbeit.h
Controller/Gruppe.h
Controller/Handler.h
Controller/HandlerGruppeAnlegen.h
Controller/HandlerLehrkraft.h
Controller/HandlerStudent.h
Controller/Passwort.h
Controller/Rollen.h
Controller/Student.h
Controller/Thema.h
Controller/DBGruppe.h
Controller/DBGruppeAnlegen.h
Controller/DBLehrkraft.h
Controller/DBPasswort.h
Controller/DBService.h

FORMS += View/Qt_Files/dialog_mainansicht.ui
View/Qt_Files/dialog_mainstudent.ui
View/Qt_Files/dialog_gruppeanlegen.ui
View/Qt_Files/dialog_about.ui
View/Qt_Files/dialog_msg.ui
View/Qt_Files/dialog_login.ui
@

dialog_mainlehr.h

@
#ifndef DIALOG_MAINLEHR_H
#define DIALOG_MAINLEHR_H

#include "dialog_mainansicht.h"

class Dialog_MainLehr : public Dialog_MainAnsicht
{
public:
Dialog_MainLehr();
void CreateActions();

public slots:
virtual void OnClickItem();
};

#endif // DIALOG_MAINLEHR_H
@

dialog_mainlehr.cpp

@#include "../header/dialog_mainlehr.h"

Dialog_MainLehr::Dialog_MainLehr()
{
FillTree(Handler->GetBelegarbeit());
CreateActions();
}

void Dialog_MainLehr::CreateActions()
{
QAction *Student = action_email_senden_an_Student;
char tmp[255];

std::vector<CBelegarbeit> *Belegarbeiten = Handler->GetBelegarbeit();

for(unsigned int i = 0; i < Belegarbeiten->size(); i++)
{
    CBelegarbeit *BA = &(Belegarbeiten)->at(i);
    std::vector<CGruppe> * Gruppen = BA->GetGruppen();
    for(unsigned int j = 0; j < Gruppen->size(); j++)
    {
        CGruppe *GR = &(Gruppen)->at(j);
        std::vector<CStudent> *Studenten = GR->GetStudenten();
        for(unsigned int k = 0; k < Studenten->size(); k++)
        {
            CStudent * ST = &(Studenten)->at(k);
            QAction *newAct = new QAction(Student);

            sprintf(tmp, "%s, %s, %s", ST->GetSNummer().c_str(), ST->GetVorname().c_str(), ST->GetNachname().c_str());
            newAct->setText(QString(tmp));
        }
    }
}

}
@

I forced a qMake manually, I forced a complete rebuild and the header is in the .pro file.

So what could be wrong?

lg

Dropye

andreyc

Do you have all virtual function defined for Dialog_MainLehr and for Dialog_MainAnsicht?

Is Dialog_MainAnsicht derived from QDialog?

Try to add the following line to the Dialog_MainLehr class declaration
@
virtual ~Dialog_MainLehr() {}
@

SGaist

Hi and welcome to devnet,

It might also happen if you add/remove the QObject macro and forget to re-run qmake before building