customslots in qt4

[jacek]

what should I now have in main() function.

You main should look more or less like this:

#include <QApplication>
#include "imagedialog.h"
 
int main(int argc, char **argv)
{
   QApplication app(argc, argv);
   ImageDialog dlg;
   dlg.show();
   return app.exec();
}

#include <QApplication>
#include "imagedialog.h"

int main(int argc, char **argv)
{
   QApplication app(argc, argv);
   ImageDialog dlg;
   dlg.show();
   return app.exec();
}

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And for the code given below should I have some other header file.

In general you put class definitions in header files (*.h) and method implementation in implementation files (*.cpp).