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class CALCSHARED_EXPORT Calc : public QObject
{
    Q_OBJECT
    public:
        Calc(QObject* pwgt) : QObject(pwgt){
            qDebug() << "[DLL]::CREATE";
            QScriptEngine *sh_engine = new QScriptEngine(this);
            qDebug() << "the magic number is:" << sh_engine->evaluate("1 + 2").toNumber();
        }
};

QScriptEngine *sh_engine = new QScriptEngine(this);
qDebug() << "the magic number is:" << sh_engine->evaluate("1 + 2").toNumber();


Calc *s_calc = new Calc(this);

#ifndef CALC_H
#define CALC_H

#include "calc_global.h"
#include <QObject>
//#include <QScriptEngine>
//#include <qDebug>

//class CALCSHARED_EXPORT Calc
//{

//    public:
//        Calc();
//};

class CALCSHARED_EXPORT Calc : public QObject {
    Q_OBJECT
    public:
        Calc(QObject *parent = 0);
};

#endif // CALC_H

#ifndef CALC_GLOBAL_H
#define CALC_GLOBAL_H

#include <QtCore/qglobal.h>

#if defined(CALC_LIBRARY)
#  define CALCSHARED_EXPORT Q_DECL_EXPORT
#else
#  define CALCSHARED_EXPORT Q_DECL_IMPORT
#endif

#endif // CALC_GLOBAL_H

#include "calc.h"
#include <QScriptEngine>
#include <qDebug>


Calc::Calc(QObject *parent) : QObject(parent){

    QScriptEngine *ml = new QScriptEngine(this);
    qDebug() << ml->evaluate("1+2+5").toNumber();

}

void MainWindow::on_pushButton_3_clicked()
{
    Calc *mc = new Calc(this);

}

void MainWindow::on_pushButton_3_clicked()
{
    qDebug() << "this: " << this;
    Calc *mc = new Calc(this);

}

#ifndef CALC_H
#define CALC_H

#include "calc_global.h"
#include <QObject>

class CALCSHARED_EXPORT Calc : public QObject {
    Q_OBJECT
    public:
        Calc(QObject *parent = 0);
};

#endif // CALC_H

#include "calc.h"
#include <QScriptEngine>
#include <qDebug>


Calc::Calc(QObject *parent) : QObject(parent){

    qDebug() << "parent: " << parent;
    qDebug() << "this: " << this;

    QScriptEngine *ml = new QScriptEngine(this);
    qDebug() << ml->evaluate("1+2+5").toNumber();

}

Calc::Calc(QObject *parent) : QObject(parent){

    qDebug() << "parent: " << parent;
    <...>

win32: LIBS += -L$$PWD/../../dll/calc/build-Calc-Desktop_Qt_5_5_0_MSVC2012_32bit-Release/release/ -lCalc
#win32: LIBS += -L$$PWD/../../dll/calc/build-Calc-Desktop_Qt_5_5_0_MSVC2012_32bit-Debug/debug/ -lCalc