How to have window's batch file detect when the screensaver is on?

Question

How to program a batch program to determine if a the screensaver is running or if the user went to sleep, or locked the computer?

In bash in Ubuntu Linux I am using the code: /gnome-screensaver-command -q | grep "is active" to determine if screensaver is running.

Note: I am not seeking recommendations for books, tools, software libraries...

Unless there is a better approach, I am working off of this script to look for processes running. But I have to find the name of the screensaver process.

@echo off
set pn=%1
echo looking for %pn%
tasklist /FI "IMAGENAME eq %pn%" 2>NUL | find /I /N "%pn%">NUL
if %ERRORLEVEL%==0 (
    echo Found program running
) else (
    echo NOT FOUND running  
)

Answer 1

The name of the screensaver process will vary by which screensaver is running, but it should always end in .scr.

tasklist | find ".scr" >nul
if %errorlevel% EQU 0 (
    echo Screensaver is running
) else (
    echo Screensaver is not running
)

The default Windows 10 screensavers have the following process names:

3D Text - ssText3d.scr
Blank   - scrnsave.scr
Bubbles - Bubbles.scr
Mystify - Mystify.scr
Photos  - PhotoScreensaver.scr
Ribbons - Ribbons.scr

---

When the computer is locked, the process LogonUI.exe runs.

tasklist | find "LogonUI.exe"
if %errorlevel% EQU 0 (
    echo Computer is locked
) else (
    echo Computer is unlocked
)