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Returns the width of the window in pixels, affected by UI scale.

screenWidth = GetScreenWidth()

Returns

screenWidth
number - 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() ) )