c++ - Unresolved External Symbol in QT connect() -


i´m pretty new qt , c++ , i´m getting error can´t manage solve. i´m trying connect currentrowchanged() signal of tableview selection model slot created can data row selected.

this code: opciones.cpp

    #include "opciones.h"     #include "ui_opciones.h"     #include <qsqldatabase.h>     #include <qsqlquery.h>     #include <qdebug.h>     #include <qmessagebox.h>     #include <qsqltablemodel.h>     #include <qitemselectionmodel.h>     #include "qmodelindex"      opciones::opciones(qwidget *parent) :         qdialog(parent),         ui(new ui::opciones)     {        ....            connect(ui->tablajuegos->selectionmodel(),signal(currentrowchanged(const qmodelindex & current, const qmodelindex & previous)),             this,slot(filaseleccionada(const qmodelindex & current, const qmodelindex & previous)));     db.close();    }  opciones::~opciones() {     delete ui; } void filaseleccionada(const qmodelindex & current, const qmodelindex & previous){   }

opciones.h

#ifndef opciones_h #define opciones_h  #include <qdialog> #include <qmodelindex>   namespace ui { class opciones; }  class opciones : public qdialog {     q_object  public:     explicit opciones(qwidget *parent = 0);     ~opciones();  private slots:     void on_pushbutton_2_clicked();      void on_pushbutton_3_clicked();   public slots:     void filaseleccionada(const qmodelindex & current, const qmodelindex & previous);    private:     ui::opciones *ui; };  #endif // opciones_h

i´m having problems connect() function giving me following error:

moc_opciones.obj:-1: error: lnk2019: unresolved external symbol "public: void __cdecl opciones::filaseleccionada(class qmodelindex const &,class qmodelindex const &)" (?filaseleccionada@opciones@@qeaaxaebvqmodelindex@@0@z) referenced in function "private: static void __cdecl opciones::qt_static_metacall(class qobject *,enum qmetaobject::call,int,void * *)" (?qt_static_metacall@opciones@@caxpeavqobject@@w4call@qmetaobject@@hpeapeax@z)

the variable tablajuegos tableview created in ui designer of qt.can tell me i´m doing wrong?

thanks help

in opciones.cpp haven't declared filaseleccionada scoped within opciones class. declare way:

void opciones::filaseleccionada(const qmodelindex & current, const qmodelindex & previous){ }

what you've done in code declare new free function, filaseleccionada. compiler has no problem this, fine have both free function , class-scoped method same name. moreover, @ link time there still not error, since not calling opciones::filaseleccionada directly anywhere. therefore, problem first encountered connect().


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