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getting area selected by mouse

hi

I am trying to get mouse work with my application
In my application i ve to select a particular region on screen of the running video through mouse click

I am using DM6446/DM365 evm boards

The question is that can we get the coordinates and the area selected by mouse ,

If so how and what are the libraries /apis for doing so
i ve enabled mouse support in device driver config

pls provide any links to let me study and apply

thanxx

kailash