[Qt-interest] moc warning and unresolved external symbol

[hazreti coolcuzu]

Hi,

I have a base class, and two derived classes as follows:

class Project : public QObject
{
Q_OBJECT
public:
...

protected:

signals:
void nameChanged(QString&);
}

class ProjectVideo : public Project
{
Q_OBJECT
....
}

class ProjectImage : public Project
{
Q_OBJECT
.....
}

I am using Qt 4.7 with Visual Studio 2008. When I rebuild, or build, it
says.

1>.\Project.h(0): Warning: No relevant classes found. No output generated.
.
.
.
1>Project.obj : error LNK2001: unresolved external symbol "public: virtual
struct QMetaObject const * __thiscall Project::metaObject(void)const "
(?metaObject at Project@@UBEPBUQMetaObject@@XZ)
1>Project.obj : error LNK2001: unresolved external symbol "public: virtual
void * __thiscall Project::qt_metacast(char const *)" (?qt_metacast at Project
@@UAEPAXPBD at Z)
1>moc_ProjectImage.obj : error LNK2001: unresolved external symbol "public:
virtual void * __thiscall Project::qt_metacast(char const *)"
(?qt_metacast at Project@@UAEPAXPBD at Z)
1>moc_ProjectVideo.obj : error LNK2019: unresolved external symbol "public:
virtual void * __thiscall Project::qt_metacast(char const *)"
(?qt_metacast at Project@@UAEPAXPBD at Z) referenced in function "protected: void
__thiscall ProjectVideo::onInvalidated(class QRect *)"
(?onInvalidated at ProjectVideo@@IAEXPAVQRect@@@Z)
1>Project.obj : error LNK2001: unresolved external symbol "public: virtual
int __thiscall Project::qt_metacall(enum QMetaObject::Call,int,void * *)"
(?qt_metacall at Project@@UAEHW4Call at QMetaObject@@HPAPAX at Z)
1>moc_ProjectImage.obj : error LNK2001: unresolved external symbol "public:
virtual int __thiscall Project::qt_metacall(enum QMetaObject::Call,int,void
* *)" (?qt_metacall at Project@@UAEHW4Call at QMetaObject@@HPAPAX at Z)
1>moc_ProjectVideo.obj : error LNK2001: unresolved external symbol "public:
virtual int __thiscall Project::qt_metacall(enum QMetaObject::Call,int,void
* *)" (?qt_metacall at Project@@UAEHW4Call at QMetaObject@@HPAPAX at Z)
1>Project.obj : error LNK2019: unresolved external symbol "protected: void
__thiscall Project::nameChanged(class QString &)" (?nameChanged at Project
@@IAEXAAVQString@@@Z) referenced in function "public: void __thiscall
Project::setName(class QString &)" (?setName at Project@@QAEXAAVQString@@@Z)
1>moc_ProjectImage.obj : error LNK2001: unresolved external symbol "public:
static struct QMetaObject const Project::staticMetaObject"
(?staticMetaObject at Project@@2UQMetaObject@@B)
1>moc_ProjectVideo.obj : error LNK2001: unresolved external symbol "public:
static struct QMetaObject const Project::staticMetaObject"
(?staticMetaObject at Project@@2UQMetaObject@@B)


How can I solve this problem?
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