API GetScreenWidth

Returns the width of the window in pixels, affected by UI scale.
 screenWidth = GetScreenWidth()
==Returns==
:;screenWidth: - Width of window in pixels
==Example==
-- Note that the return value does not match the screen resolution set in the Video Options, but will instead represent a dimension with the same aspect ratio.
 DEFAULT_CHAT_FRAME:AddMessage( ( GetScreenWidth() * UIParent:GetEffectiveScale() ).."x"..( GetScreenHeight() * UIParent:GetEffectiveScale() ) )