Cross platform application???

[Brandybuck]

thanks a lot for this info. can you refer me some more technical details in some links about this and to what extent i can make my programs cross platform.

You need to compile and link on your target platforms. The source code is cross platform, but you still need to build on all platforms. The included qmake utility will help you greatly. Please see the qmake documentation. It comes with Qt.

If you are still having problems, I would greatly urge you to get the book "C++ GUI Programming with Qt 4". It will contain all the information you need.