error LNK2001: unresolved external symbol "public: static struct QMetaObject const BUtils

[JoeCFD]

I have a small qt class BUtils with export definition. It is defined in one module BMesh(dll) and can be compiled in the module BMesh without issue in VIsual Studio. Then I use BUtils in another module(dll) TBase. I added qt libraries, BMesh.lib and include paths in the
properties of module TBase. I started to recompile TBase and got the linking error:

.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const BUtils::staticMetaObject

I have another static variable defined in BUtils and got the following error:
.obj : error LNK2001: unresolved external symbol "public: static bool BUtils::m_bStop"
It seems only related to static definition. I have another nonstatic funcion and there is no error message to complains about
that one. What is wrong? Thanks for your help

[SGaist]

Hi,

Can you show how you exported your class ?

[JoeCFD]

============================Global.h==========================

#ifndef GLOBAL_H
#define GLOBAL_H

#  ifndef Global_EXPORT
#  define Global_EXPORT __declspec( dllexport )
#endif

===========================BUtils.h===========================

#ifndef BUtils_H
#define BUtils_H

#include "Global.h"
#include <QtCore/QObject>

class Global_EXPORT BUtils : public QObject
{
    Q_OBJECT
    
public:
    static bool m_bStop;
    
    void sendPercent( double percent );

signals:
    void emitPercent( double );
};

#endif

===========================BUtils.cpp==================================

#include "BUtils.h"

bool BUtils::m_bStop = false;

void BUtils::sendPercent( double percent )
{
    emit emitPercent( percent );
}

[edit: Added missing coding tags SGaist]

[SGaist]

Ok, you only did half the work regarding symbol handling. There's exporting and importing symbols on Windows.

You can find a nice example on how to do that in the Creating Shared Libraries chapter of Qt's documentation

[JoeCFD]

Got it. Thanks a lot

Joe

[SGaist]

You're welcome !

Since you have it working now, please mark the thread as solved using the "Topic Tool" button so that other forum users may know a solution has been found :)

[JoeCFD]

Vielen Dank!