Unresolved external symbol "public: virtual struct QMetaObject const * __thiscall Parent

Question

I inherited a class from QObject :

class Parent: public QObject
{
    Q_OBJECT
    QObject* cl;

public:
    Parent(QObject *parent=0):QObject(parent) {
            


        

Answer 1

In my case (using QtAdd-in with VS2012 and Qt v4.8.4) none of the above suggestions worked. For some reason VS could not generate proper moc files (build output: No relevant classes found. No output generated.) and when I compiled relevant headers by hand (setting qt moc as a compiler and clicking 'Compile') it produced empty moc file.

What did work was to compile all necessary mocs from command line (moc -o moc_SomeClass.cpp SomeClass.h) and then replace the wrong ones in GeneratedFiles folder.

This is only workaround (and not a convenient one for a big project) to have your project build succesfully, but does not really explain strange VS/QtAdd-in behaviour.