How to determine that a screensaver is running?

Question

One solution that one could suggest is to periodically look for a special \'Screen-saver\' desktop, and if it\'s present then count it as a running screensaver.

But

Answer 1

This is my implementation of screen saver event detection.

Notes:

• SPI_GETSCREENSAVERRUNNING detects Windows Event id 4802 and 4803 which weren't accurate in my case, see my problem hence user idle time calculation is added
• GetLastInputInfo apparently doesn't work if process is a service.