Link Error By Q_OBJECT

jronald

EvaluateWidget .h

#ifndef EVALUATEWIDGET_H
#define EVALUATEWIDGET_H

#include <QtTreePropertyBrowser>

class EvaluateWidget : public QtTreePropertyBrowser
{
    Q_OBJECT
public:
    EvaluateWidget(QWidget * parent = 0);
};

#endif // EVALUATEWIDGET_H

EvaluateWidget .cpp

#include "EvaluateWidget.h"
EvaluateWidget::EvaluateWidget(QWidget * parent) : QtTreePropertyBrowser(parent)
{

}

Link error:

moc_EvaluateWidget.obj:-1: error: LNK2001: unresolved external symbol "public: static struct QMetaObject const QtTreePropertyBrowser::staticMetaObject" (?staticMetaObject@QtTreePropertyBrowser@@2UQMetaObject@@B)

Env:

Desktop_Qt_5_9_1_MSVC2017_64bit
Qt Creator 4.3.1

If Q_OBJECT is removed, everything is OK.
Any way to solve the problem?

mrjj

@jronald said in Link Error By Q_OBJECT:

LNK2001: unresolved external symbol "public: static struct QMetaObject

Hi
Step one is to delete the build folder and rebuild
if that dont help then, remove Q_OBJECT and add it again

https://stackoverflow.com/questions/14170770/unresolved-external-symbol-public-virtual-struct-qmetaobject-const-thiscal

Also check the moc_* files are being generated.

jronald

I've already searched the web, and tried hard, but no help.

If replace QtTreePropertyBrowser with QWidget, no error.

hskoglund

Hi, googling "unresolved external symbol "public: static struct QMetaObject const QtTreePropertyBrowser" returns this 7 year old bug
At the end it says adding the symbol QT_QTPROPERTYBROWSER_IMPORT to your build environment should help.

jronald

Solved!
Thanks very much.