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

My problem was that one of my files that used a Qt macro didn't get moc'ed. I found out, that the Qt Plugin for Visual Studio doesn't recognize the Q_NAMESPACE macro and therefore doesn't add the file to the moc'ing list.

So I used the solution from this answer to add the file to the mic'ing list:

You should find a .h file which has successfully generated "moc_*", and copy all the contents in "Custom Build Tool -> General" to the new .h file setting page.

Be careful with the different options for Debug and Release-Mode.

After that, build your project.

Build it once each in Debug and Release-Mode

Finally, add the generated "moc_*" file to your project.

Now, "moc_filename.cpp" should be in Generated Files\Debug and Generated Files\Release.

Right click on each of them and change thair properties:

• The file in Debug: Change configuration to Release and then change General->Excluded from build to yes.
• The file in Release: Change configuration to Debug and then change General->Excluded from build to yes.