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TEMPLATE = lib
TARGET = 
DEPENDPATH += .
INCLUDEPATH += .
# Input
HEADERS += dynlib.h
SOURCES += dynlib.cpp
CONFIG +=dll

#include <QString>

extern "C" {
    QString oddUpper(const QString& str);
}

#include "dynlib.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;
}

TEMPLATE = app
TARGET = 
DEPENDPATH += .
INCLUDEPATH += .

# Input
SOURCES += main.cpp

#include <QtGui>

// ----------------------------------------------------------------------
int main(int argc, char** argv)
{
    QApplication app(argc, argv);
    QLabel       lbl("this is the example text");
    QLibrary     lib("DLL");

    typedef QString (*Fct) (const QString&);
    Fct fct = (Fct)(lib.resolve("oddUpper"));
    if (fct) {
        lbl.setText(fct(lbl.text()));
    }
    lbl.show();

    return app.exec();
}

TEMPLATE = lib
TARGET = 
DEPENDPATH += .
INCLUDEPATH += .
CONFOG +=dll

# Input
HEADERS += dynlib.h
SOURCES += dynlib.cpp

#ifdef Q_OS_WIN
	#define LIB_EXPORT __declspec(dllexport)
#else
	#define LIB_EXPORT
#endif

#include <QString>

LIB_EXPORT QString oddUpper(const QString& str);

#include "dynlib.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;
}

extern "C" MY_EXPORT int avg(int a, int b)
{
    return (a + b) / 2;
}

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