How to query X11 display resolution?

Question

It seems like an simple problem, but I can\'t find the answer: How do you query (via X11) what monitors exist and their resolutions?

Answer 1

Check out display macros and screen macros from the Xlib manual.

Specifically:

• From the first link: ScreenCount(), ScreenOfDisplay()
• From the second link: WidthOfScreen(), HeightOfScreen()