[Qt-interest] undefined reference to `vtable for ScannerWidget' ?

[Jorge Abrines]

Hi Kermit,

It looks like you haven't included ScannerWidget.cpp into SOURCES variable in 
your .pro file.

Regards,

Jorge

Kermit Mei wrote:
> Hello, I defined a class ScannerWidget, but
> I don't konw why the error is like this:
> 
> $ make
> Linking CXX executable ../bin/FreeRecite-core
> gui/libFreeReciteGui.so: undefined reference to `vtable for ScannerWidget'
> gui/libFreeReciteGui.so: undefined reference to 
> `ScannerWidget::complished()'
> gui/libFreeReciteGui.so: undefined reference to 
> `ScannerWidget::qt_metacall(QMetaObject::Call, int, void**)'
> gui/libFreeReciteGui.so: undefined reference to `vtable for ReciterWidget'
> gui/libFreeReciteGui.so: undefined reference to 
> `ReciterWidget::staticMetaObject'
> gui/libFreeReciteGui.so: undefined reference to `typeinfo for ScannerWidget'
> gui/libFreeReciteGui.so: undefined reference to `vtable for MainWindow'
> gui/libFreeReciteGui.so: undefined reference to 
> `ScannerWidget::staticMetaObject'
> gui/libFreeReciteGui.so: undefined reference to 
> `ScannerWidget::metaObject() const'
> gui/libFreeReciteGui.so: undefined reference to 
> `ScannerWidget::qt_metacast(char const*)'
> collect2: ld returned 1 exit status
> 
> 
> What may couse errors like this? Can anyone give me some tip?
> 
> 
> 
> My header is as the following:
> 
> 
> #ifndef FR_SCANNERWIDGET_H
> #define FR_SCANNERWIDGET_H
> 
> #include "ui_ScannerWidget.h"
> 
> namespace freeRecite {
> class Scanner;
> }
> 
> class ScannerWidget : public QWidget,
>                       public Ui::ScannerWidget
> {
>   Q_OBJECT
> public:
>   explicit ScannerWidget(QWidget *parent = 0);
>   ~ScannerWidget();
>   virtual void start(time_t taskID) = 0;
> signals:
>   void complished();
> protected slots:
>   void lineReturned();
>   void showNext();
>   void showAnswer();
>   void add();
>   void remove();
>   void modify();
> protected:
>   void setInfo();
>   void complish();
> 
>   freeRecite::Scanner *scanner;
>   bool freeze; //If freeze == true, the lineEdit is showing the 
> answer.      
>   time_t startTime;
>   int maxBar;
> };
> 
> #endif //FR_SCANNERWIDGET_H    
> 
> 
> Thank you!
> Kermit Mei
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