How to Create single instance of Application using Shared memory???

Hi ALL
I need to create a single instance of application inside . If application is already running and second time i m running the exe it should not run. I've attached the sample code.. But its not running. can any body tell me how to solve this???

http://qt.nokia.com/products/appdev/...leapplication/

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Originally Posted by dbzhang800

http://qt.nokia.com/products/appdev/...leapplication/

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But i guess this is for license version. I'm using LGPL. :(

Dont guess... read completely.
There is also a LGPL version of that - Single Application