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We are developing screen capture utility which allows users to capture selected area on screen. Which works on 10.7 and above. As per apple Technical Q&A QA1741 we have used below API to capture screen.

CGDisplayCreateImageForRect(displayId,selectedArea)

This API works fine for normal scenario. Howerver there is one issue with systen screen zoom feature(cmd+shift+=)

Whenever we try to capture zoomed area, we are not getting correct output.

I know that we need to apply screen zoom factor to selected rect. But I am not finding any API to get screen zoom level. Can any one show me some pointers to resolve this issue.

SPrabhu
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