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#ifndef DLL_TEST1_H
#define DLL_TEST1_H

#include <QString>
extern "C" {
    QString oddUpper(const QString& str);
    int countOfChars (const QString& str);
}

#endif // DLL_TEST1_H

#include "dll_test1.h"

QString oddUpper(const QString& str)
{
    QString strTemp;
    for (int i = 0; i < str.length(); ++i) {
        strTemp += (i % 2) ? str.at(i) : str.at(i).toUpper() ;
    }
    return strTemp;
}

int countOfChars(const QString& str)
{
    return str.count();
}

TEMPLATE = lib
DESTDIR = ..
QT -= gui
SOURCES = dll_test1.cpp
HEADERS = dll_test1.h
TARGET = dll_test1

#include <QtGui>

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

QLabel lbl("this is the example text ");
QLibrary my_lib("dll_test1");
typedef QString (*FunctionRef) (const QString&);
typedef int (*CountRef) (const QString&);
FunctionRef fr = (FunctionRef) (my_lib.resolve("oddUpper"));
CountRef cr = (CountRef) (my_lib.resolve("countOfChars"));
if (fr){
    lbl.setText(fr(lbl.text()));
}
int x;
if(cr)
    x = cr(lbl.text());
x = x+1;
lbl.show();
    return a.exec();
}