Request Help With Gdk.Display

[MRAB]

On 2017-08-16 18:57, Wildman via Python-list wrote:
> I am working on a program for the Linux platform that
> reports system information.  The program reports screen
> information, number of monitors, resolution of each one
> and the total resolution.  It does it using a couple of
> external utils, Xrandr and Xdpyinfo.  It is my goal to
> replace the existing code with a python solution without
> depending on the external programs.
> 
> With the help of a code snippet I found, I came up with
> this but it only reports the resolution of the primary
> monitor...
> 
> #! /usr/bin/env python3
> 
> import gi
> gi.require_version('Gdk', '3.0')
> from gi.repository import Gdk
> 
> display = Gdk.Display.get_default()
> pm = display.get_primary_monitor()
> geo = pm.get_geometry()
> w = geo.width
> h = geo.height
> print(w,h)
> 
> 
> I know that the number of monitors can be obtained by
> using...
> 
> mc = Gdk.Display.get_n_monitors(display)
> 
> Then to get each monitor, this can be used...
> 
> monitor = Gdk.Display.get_monitor(display, monitor_num)
> 
> My problem is that I can't find any information on how
> "monitor_num" is obtained.  The only thing I have been
> able to find out is that it is an integer.  Can anybody
> point me in the right direction?  Much appreciated.
> 
If get_n_monitors tells you how many monitors there are, isn't 
monitor_num just an index (0, 1, 2, ...)?