Subclassing QThread — undefined reference to vtable

[jmalicke]

I understand that the undefined reference to vtable error means that I have a pure virtual function that must be implemented. I cannot for the life of me find what I am missing to make this class compile.

WaspThread.h

@#include <QThread>

class WaspThread : public QThread
{
Q_OBJECT

protected:
void run();
};@

WaspThread.cpp

@#include "WaspThread.h"

void WaspThread::run()
{

}@

project.pro

@SOURCES += WaspThread.cpp
HEADERS += WaspThread.h@

I have the header and source files in my project file. I have tried cleaning out my build directory and re-running qmake multiple times.

[jmalicke]

I just figured out the problem. I had forgotten to export the WaspThread class so that the executable utilizing the DLL could find WaspThread. It was a silly mistake. I made it because I forgot that in Windows land you need to export everything whereas in Linux you don't.

[SGaist]

Hi,

Got also hit by that one, did you saw that Qt provides macros to help you export the class cross-platform style ?

On a side note, since you have it working, can you also update the thread title prepending [solved] so other forum users may know a solution has been found :)