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pomijam ze nie napisales systemu operacyjnego dlatego napisalem wszystko pod windowsa

https://www.google.nl/search?[...];sourceid=chrome&ie=UTF-8

https://stackoverflow.com/que[...]or-state-in-windows-on-or-off

GetDevicePowerState sometimes works for monitors. If it's present, you can open the \.\LCD device. Close it immediately after you've finished with it.

Essentially, you're out of luck -- there is no reliable way to detect the monitor power state, short of writing a device driver and filtering all of the power IRPs up and down the display driver chain. And that's not very reliable either.

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