Solved Run-time error : QMetaType::registerType: Binary compatibility break -- Size mismatch for type ...

[ddze]

I have a run-time crash due to a qRegisterMetaType();

1. So a class to be registered is declared with the Q_DECLARE_METATYPE.

class IBase {
public:
    IBase();                      /** default constructor*/
    IBase(const IBase & a);       /** copy constructor */
    ~IBase(){}                    /** destructor */
};
Q_DECLARE_METATYPE(IBase)

2. the constructor of the class that uses the IBase calls the qRegisterMetaType() and than crashes.

IBaseMimeData::IBaseMimeData(const IBase *mod){
    refModule = mod;
    qRegisterMetaType<IBase*>("IBase");   // <<  RUN-TIME CRASH
    supportedFormats <<DRAG_AND_DROP_MIME_NAME;
}

How to fix this problem.? I do not have any other Qt libraries but the Version 5.50 / and the compiler Mingw 492.

[kshegunov]

@ddze
Hello,
You're doing it wrong.

IBaseMimeData::IBaseMimeData(const IBase * mod)
{
    // ...
    qRegisterMetaType<IBase>();   //< IBase is declared, not IBase *. Don't pass a string argument to the function!
    // ...
}

Kind regards.

[ddze]

@kshegunov , you are a legend. Thanks.