List serial ports in Qt application on windows and Mac

I am creating one Qt based application for windows and Mac OS X. I used Qextserial port to connect and communicate through serial port it works well.

But now I need to list existing serial ports in a system like "COM1" "COM2" etc.

How I can do this in Qt, is there any native C++ code available to list existing serial ports in a system that i can include in Qt application

Source: http://www.qtcentre.org/threads/50778-List-serial-ports-in-Qt-application-on-windows-and-Mac?goto=newpost

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