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#include "tstdll.h"

tstDll::tstDll()
{
    
}

tstDll::~tstDll()
{

}

void tstDll::dd()
{
    QWidget *k = new QWidget(0);
    k->show();
    k->setStyleSheet("background-color:red;");

}

#ifndef TSTDLL_H
#define TSTDLL_H

#include "tstdll_global.h"
#include <QWidget>


 extern "C" class TSTDLL_EXPORT tstDll
{
public:
    tstDll();
    ~tstDll();
    void dd();
private:

};

#endif // TSTDLL_H

#include "tstdllload.h"

tstDllLoad::tstDllLoad(QWidget *parent, Qt::WFlags flags)
    : QWidget(parent, flags)
{
    ui.setupUi(this);
    myLib.setFileName("tstDll");
    bool b = myLib.load();
    typedef tstDll (*dd)();
    dd myFunction = (dd) myLib.resolve("tstDll");
    if (myFunction)
        myFunction();
}

tstDllLoad::~tstDllLoad()
{

}

#ifndef TSTDLLLOAD_H
#define TSTDLLLOAD_H

#include <QtGui/QWidget>
#include "ui_tstdllload.h"
#include <QLibrary>

class tstDllLoad : public QWidget
{
    Q_OBJECT

public:
    tstDllLoad(QWidget *parent = 0, Qt::WFlags flags = 0);
    ~tstDllLoad();

private:
    Ui::tstDllLoadClass ui;
    QLibrary myLib;
};

#endif // TSTDLLLOAD_H

void * func = <какая то функция>
// а далее надо получить тип класса, допустим  "tstDll", но его то я незнаю. Откуда его взять?
<???>tstDll</???> * funcDll = *func;

#ifndef DLL_H
#define DLL_H

#include <QObject>

#ifdef Q_WS_WIN
 #define MY_EXPORT __declspec(dllexport)
 #else
 #define MY_EXPORT
 #endif

extern "C" MY_EXPORT QObject *getObj();

#endif // DLL_H

#include "dll.h"
#include <QDebug>

QObject *getObj()
{
QObject *obj = new QObject();
obj->setObjectName("tra-ta-ta");
qDebug() << "OK from DLL" << endl;
return obj;
}

#include <QtCore/QCoreApplication>
#include <QLibrary>
#include <QDebug>

int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

QLibrary lib("filname.dll");
typedef QObject* (*MyPrototype)();
MyPrototype myFunction = (MyPrototype)lib.resolve("getObj");
if(myFunction) {
   QObject *obj = myFunction();
   qDebug() << obj->objectName() << endl;
}

return a.exec();
}