[Qt-interest] unresolved Symbol (QMetaObject const QwtPlot::staticMetaObject) in qwtplot derived Class

[Ian Thomson]

If both files have Q_OBJECT macro, and are being moc'ed and the 
moc_*.cpp is being compiled, then it should all work fine.

Searching through the qt-interest archives, it seems like there are a 
few related problems with qwt, often with visual studio 2005.

If you have not searched this list and the qwt mailing list archives 
then I recommend it. Some previous solution may work for you. Otherwise 
I would try asking on the qwt list as well, as it seems to be a problem 
specific to that library.

Cheers,
Ian.


Matthias Pospiech wrote:
> Ian Thomson schrieb:
>> Hi,
>>
>> It seems as if you have a QObject derived class called Zoomer inside 
>> your .cpp file. This class doesn't have the Q_OBJECT macro.
>>
>> Is this the case? If so, is moc being run on this class's definition 
>> inside the .cpp file?
>>
>>   
> Indeed not moc is generated for the Zoomer class. But this class is not 
> using signals or slots itsself.
> Out of interest I have placed it in the .h file. This now gives me 
> errors for both classes:
> 
> 1>moc_QScatterPlot.obj : error LNK2001: Nicht aufgelöstes externes 
> Symbol ""public: static struct QMetaObject const 
> QwtPlot::staticMetaObject" (?staticMetaObject at QwtPlot@@2UQMetaObject@@B)".
> 1>moc_QScatterPlot.obj : error LNK2001: Nicht aufgelöstes externes 
> Symbol ""public: static struct QMetaObject const 
> QwtPlotZoomer::staticMetaObject" 
> (?staticMetaObject at QwtPlotZoomer@@2UQMetaObject@@B)".
> 
> So no problem is solved by adding a Q_OBJECT in the Zoomer class.
> 
> Matthias
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