Delphi and Qt4

Hi all,
we are "old" delphi developer and we moved to Qt about one year ago. Now we need to integrate our previous delphi applications with new fetures implemented using Qt. Our idea was to encapsulate Qt developed functions into dlls.
As you can imagine, our problem is related to QApplication.
1) Any idea about the way to preceed? I mean: is there a standard way to encapsulate Qt code into dll to be reused from Delphi applications?
2) We heard about qtwinmigrate package. Can this package help us?

We are curently using Qt 4.3.3 under both VISTA and XP and we are commercial users

Thanks in advance
Marco