DLL导出定义 Common_Global.h

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#if defined(COMMON_LIBRARY)
#  define COMMON_EXPORT Q_DECL_EXPORT
#else
#  define COMMON_EXPORT Q_DECL_IMPORT
#endif

定义接口 IGrr.h

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#pragma once
#include "../Common/Common_global.h"

class QDetectObj;
class COMMON_EXPORT IGRR
{
public:
	virtual void Show() = 0;
};

##定义界面导出类QGrrUI.h

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#include <QObject>
#include "IGrr.h"
#include "GRR.h"


class COMMON_EXPORT QGrrUI : public IGRR
{
public:
	QGrrUI();
	~QGrrUI();
	virtual void Show()override;

private:
	GRR* m_pGrr;
};

extern "C" {
	COMMON_EXPORT QGrrUI* getObj();
}

定义界面导出类QGrrUI.cpp

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QGrrUI::QGrrUI()
{
	m_pGrr = new GRR();
}

QGrrUI::~QGrrUI()
{
}

void QGrrUI::Show()
{
	m_pGrr->show();
}

COMMON_EXPORT QGrrUI* getObj()
{
	return new QGrrUI;
}

同时设置DLL工程的预编译添加“COMMON_LIBRARY”

调用方

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#include "IGRR.h"
typedef IGRR* (*getGrrObj)();

class Users{
private:
	IGRR *m_PGrr;
}

void QStateWidget::onDataAnalyze()
{
	QString dllName = QApplication::applicationDirPath() + "/GRR.dll";
	QLibrary* draw = new QLibrary(dllName);
	if (draw->load()) {
		getGrrObj drawObj = (getGrrObj)draw->resolve("getObj");
		IGRR* obj = drawObj();
		obj->Show();
	}
}