How to determine the visible buffer width in characters

Question

I'm using a custom modeline and I'm starting to get how to configure it but here I'm stuck as to how to get the info I want: I'd like to show, in each buffer's modeline, the width in characters of the buffer.

I'm also using linum-mode (with always at least two columns used) and ideally I'd like to deduce the number of characters used by linum from the width.

Answer 1

函数(window-width)是您要查找的功能，其中不包含linum-mode使用的字符，但是您可以从(window-margins)获取其宽度