QDESIGNER_WIDGET_EXPORT causes dll linkage errors

mourke

I am trying to create a custom button class with an enum that change be changed from inside Qt Designer.

I have added the QDESIGNER_WIDGET_EXPORT macro to my class definition so it looks like this:

#ifndef TITLEBARBUTTON_H
#define TITLEBARBUTTON_H

#include <QPushButton>
#include <QtUiPlugin/QDesignerExportWidget>

class QDESIGNER_WIDGET_EXPORT TitleBarButton : public QPushButton {
	Q_OBJECT

	Q_PROPERTY(Type type READ type WRITE setType)

public:

	enum Type { Minimize, Maximize, Restore, Close };
	Q_ENUM(Type)

	Type type() const { return m_type; }
	void setType(const Type &type);

	
	TitleBarButton(QWidget *parent);
	~TitleBarButton();

private:
	Type m_type;
};

#endif // TITLEBARBUTTON_H

I am using Visual Studio so I have checked the UI Tools module in the QT VS Tools > Qt Project Settings > Qt Modules options menu.

When I go to build the project I get errors about inconsistent dll linkage. Upon further investigation this is caused by using __declspec(dllimport) instead of __declspec(dllexport) . In Qt this is done depending on a QDESIGNER_EXPORT_WIDGETS macro being defined. Replacing QDESIGNER_WIDGET_EXPORT with Q_DECL_EXPORT allows my project to successfully build but I cannot see my enum in the properties inspector inside Qt designer.

What am I doing wrong?

Christian Ehrlicher

@mourke said in QDESIGNER_WIDGET_EXPORT causes dll linkage errors:

QDESIGNER_EXPORT_WIDGETS

Don't use it since it's not meant to be used this way (as you've noticed)

SGaist

Hi,

Follow the guide lines shown in Creating Shared Libraries with regards to the macros.