问题
I'd like to change the window/frame size of my XEmacs based on the current display resolution.
This is useful when I run my laptop either by itself or attached to a docking station with an external monitor. In either situation, I'd like Emacs to detect the primary screen resolution and adjust its main window frame size accordingly when I start it up.
回答1:
The current display resolution is available using the following functions (both non-interactive).
(x-display-pixel-width)
(x-display-pixel-height)
回答2:
For a more cross-platform solution, look at
(display-pixel-width)
(display-pixel-height)
If what you actually want to do is set the Emacs window to full screen on start-up, check out maxframe.el.
来源：https://stackoverflow.com/questions/2151449/can-i-detect-the-display-size-resolution-in-emacs