I am confused by what you state in the above... CGDisplayBounds
returns a CGRect that outlines the bounds in global coordinates for
the display ID you supply it. It doesn't return display IDs nor
kCGNullDirectDisplay.
My apologies for not explaining properly... I am getting a point
from the current display the mouse is located on, calling
CGGetDisplaysWithPoint() for the point and then passing the returned
display ID to CGDisplayBounds(). In the case that the secondary
display is above or below the primary one CGGetDisplaysWithPoint()
returns null -- and of course my call to CGDisplayBounds as a result
returns nothing.
So I guess it's more the case that CGGetDisplaysWithPoint() doesn't
appear to function as I would expect for stacked displays.
Are you sure the coordinate space of the mouse coordinates is correct?
How are you getting the mouse coordinates?
I suggest you use CG calls to get a list of active displays and
iterate over that list to output the bounds for all of the displays.
Then take a look at the mouse coordinates you are attempting to use
and see if the fall in the rects you got.
