gdk-screen-monitor-width-mm (screen monitor-num)

screen -- a gdk-screen object
monitor-num -- an integer with the number of the monitor, between 0 and and the result of (gdk-screen-n-monitors screen)

An integer with the width of the monitor, or -1 if not available.

Gets the width in millimeters of the specified monitor, if available. The gdk-screen-monitor-width-mm function has been deprecated since version 3.22 and should not be used in newly written code. Use the gdk-monitor-width-mm function instead.