[Qt-interest] how to resolve this moc linker error

[Malyushytsky, Alex]

I would double check that you built mentioned dll with Q_OBJECT macro defined there.
Also it is probably worth to verify that your import / export was defined properly.

As an example piece of code from qt property browser:

#if QT_VERSION >= 0x040400
QT_BEGIN_NAMESPACE
#endif

#if defined(Q_WS_WIN)
#  if !defined(QT_QTPROPERTYBROWSER_EXPORT) && !defined(QT_QTPROPERTYBROWSER_IMPORT)
#    define QT_QTPROPERTYBROWSER_EXPORT
#  elif defined(QT_QTPROPERTYBROWSER_IMPORT)
#    if defined(QT_QTPROPERTYBROWSER_EXPORT)
#      undef QT_QTPROPERTYBROWSER_EXPORT
#    endif
#    define QT_QTPROPERTYBROWSER_EXPORT __declspec(dllimport)
#  elif defined(QT_QTPROPERTYBROWSER_EXPORT)
#    undef QT_QTPROPERTYBROWSER_EXPORT
#    define QT_QTPROPERTYBROWSER_EXPORT __declspec(dllexport)
#  endif
#else
#  define QT_QTPROPERTYBROWSER_EXPORT
#endif


...........................


#include "qtpropertybrowser.h"

#if QT_VERSION >= 0x040400
QT_BEGIN_NAMESPACE
#endif


class QT_QTPROPERTYBROWSER_EXPORT QtButtonPropertyBrowser : public QtAbstractPropertyBrowser
{
    Q_OBJECT
public:
....................

In your project using dll check if you defined QT_QTPROPERTYBROWSER_IMPORT.


Alex


-----Original Message-----
From: Matthias Pospiech [mailto:matthias.pospiech at gmx.de]
Sent: Monday, July 19, 2010 3:05 PM
To: Malyushytsky, Alex
Cc: qt-interest at trolltech.com
Subject: Re: [Qt-interest] how to resolve this moc linker error

Matthias Pospiech schrieb:
> Malyushytsky, Alex schrieb:
>
>> First thing I would check if moc are generated/build with the same compiler version (32 bit, 64 bit , etc).
>>
>>
> Qt is not build with 64 Bit and I use the same Qt Versions in multiple
> projects, so I doubt that that is the reason.
> The thing mainly is, that mainwindow.cpp has a class in the ui called
> QCameraWidget, which is derived from QCameraImage.
> The error thus appears in the base class. QCameraWidget and QCameraImage
> both are part of a DLL, which is loaded in the example where
> mainwindow.cpp is placed.
>
It compiles if I remove the Q_OBJECT from the QCameraImage, but why?


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