下面的 MWE 在scrpage2注释掉该行后工作正常，但在注释掉该行后则不行。取消注释该行后，我收到错误：
Class scrlttr2 Warning: Usage of package `fancyhdr' together
(scrlttr2) with a KOMA-Script class is not recommended.
(scrlttr2) I'd suggest to use
(scrlttr2) package `scrpage2' or `scrlayer-scrpage'.
(scrlttr2) Nevertheless, using requested
(scrlttr2) package `fancyhdr' on input line 7.
(/usr/share/texlive/texmf-dist/tex/latex/fancyhdr/fancyhdr.sty
! LaTeX Error: Command \chead already defined.
Or name \end... illegal, see p.192 of the manual.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.270 ...chead}{\@ifnextchar[{\@xchead}{\@ychead}}
因此，scrlttr2建议显然是从 转移fancyhdr到基于scrpage2/ 的内容scrheadings，我已经在使用它了\rohead。该怎么做？如果我得到答案，我会更新对“第 # 页，共 ## 页”问题的回答。
\documentclass[12pt]{scrlttr2}
%\usepackage{scrpage2}
%\pagestyle{scrheadings}
%\rohead{\jobname.tex\hspace{0.5cm}\today}
\usepackage{lastpage}
\usepackage{fancyhdr}
\pagestyle{fancy}
\renewcommand{\headrulewidth}{0pt}
\fancyfoot[C]{\thepage\ of \pageref{LastPage}}
\fancypagestyle{plain}{%
\renewcommand{\headrulewidth}{0pt}%
\fancyhf{}%
\fancyfoot[C]{\thepage\ of \pageref{LastPage}}}
\usepackage[T1]{fontenc}
\usepackage{fouriernc}
\begin{document}
\def\today{10th December, 2015}
\begin{letter}{To Address}
\opening{Addressee}
\closing{Yours Sincerely,}
\end{letter}
\end{document}
答案1
和KOMA-Script 版本 3.19 或更新版本和 documentclassscrlttr2不需要加载额外的包来获取page # of ##您的信件。您只需\pagemark使用以下方法重新定义\pageref{\thisletter.lastpage}：
\renewcommand\pagemark{{\usekomafont{pagenumber}%
\pagename\nobreakspace\thepage\nobreakspace
of\nobreakspace\pageref{\thisletter.lastpage}%
}}
如果页码也应该在第一页，请添加以下行：
\setkomavar{firstfoot}{\parbox{\linewidth}{\centering\pagemark}}
梅威瑟：
\documentclass[12pt]{scrlttr2}[2015/10/03]
\setkomavar{firstfoot}{\parbox{\linewidth}{\centering\pagemark}}
\renewcommand\pagemark{{\usekomafont{pagenumber}%
\pagename\nobreakspace\thepage\nobreakspace
of\nobreakspace\pageref{\thisletter.lastpage}%
}}
\usepackage[T1]{fontenc}
\usepackage{fouriernc}
\usepackage{blindtext}
% only for dummytext
\begin{document}
\setkomavar{date}{10th December, 2015}% note that I have changed the koma variable date instead \today
\begin{letter}{To Address}
\opening{Addressee}
\Blindtext[10]
\closing{Yours Sincerely,}
\end{letter}
\end{document}
或者使用你的标题：
\documentclass[12pt]{scrlttr2}[2015/10/03]
\usepackage{scrlayer-scrpage}
\ohead*{\jobname.tex\hspace{0.5cm}\usekomavar{date}}
\setkomavar{firstfoot}{\parbox{\linewidth}{\centering\pagemark}}
\renewcommand\pagemark{{\usekomafont{pagenumber}%
\pagename\nobreakspace\thepage\nobreakspace
of\nobreakspace\pageref{\thisletter.lastpage}%
}}
\usepackage[T1]{fontenc}
\usepackage{fouriernc}
\usepackage{blindtext}
% only for dummytext
\begin{document}
\setkomavar{date}{10th December, 2015}
\begin{letter}{To Address}
\opening{Addressee}
\Blindtext[10]
\closing{Yours Sincerely,}
\end{letter}
\end{document}
还可以在同一文档中打印具有正确页码的第二封信件：
\documentclass[12pt]{scrlttr2}[2015/10/03]
\usepackage{scrlayer-scrpage}
\ohead*{\jobname.tex\hspace{0.5cm}\usekomavar{date}}
\setkomavar{firstfoot}{\parbox{\linewidth}{\centering\pagemark}}
\renewcommand\pagemark{{\usekomafont{pagenumber}%
\pagename\nobreakspace\thepage\nobreakspace
of\nobreakspace\pageref{\thisletter.lastpage}%
}}
\usepackage[T1]{fontenc}
\usepackage{fouriernc}
\usepackage{blindtext}% only for dummytext
\begin{document}
\setkomavar{date}{10th December, 2015}
\begin{letter}{To Address}
\opening{Addressee}
\Blindtext[10]
\closing{Yours Sincerely,}
\end{letter}
\begin{letter}{To Address}
\setkomavar{subject}{Second letter}
\opening{Second Addressee}
\Blindtext[20]
\closing{Yours Sincerely,}
\end{letter}
\end{document}
旧版本的信息：使用KOMA-Script 版本 3.18 或更早版本您必须加载包lastpage。
\documentclass[12pt]{scrlttr2}
\usepackage{lastpage}
%\usepackage{scrlayer-scrpage}
%\ohead*{\jobname.tex\hspace{0.5cm}\usekomavar{date}}
\setkomavar{firstfoot}{\parbox{\linewidth}{\centering\pagemark}}
\renewcommand\pagemark{{\usekomafont{pagenumber}%
\pagename\nobreakspace\thepage\nobreakspace
of\nobreakspace\pageref{\thisletter.lastpage}%
}}
\usepackage[T1]{fontenc}
\usepackage{fouriernc}
\usepackage{blindtext}
\begin{document}
\setkomavar{date}{10th December, 2015}
\begin{letter}{To Address}
\opening{Addressee}
\Blindtext[10]
\closing{Yours Sincerely,}
\end{letter}
\end{document}
other classes另外，这里是只有一个页码方案的示例。如果您加载两个包scrlayer-scrpage，则lastpage可以重新定义\pagemark：
\documentclass{book}
\usepackage{lastpage}
\usepackage{scrlayer-scrpage}
\renewcommand\pagemark{{\usekomafont{pagenumber}%
\pagename\nobreakspace\thepage\nobreakspace
of\nobreakspace\pageref{\thisletter.lastpage}%
}}
\usepackage{blindtext}
\begin{document}
\blinddocument
\end{document}