电话号码不显示字母类别

Question

我正在使用 Letter 类撰写正式信件。添加\telephone{}以下命令\address{}在示例中这里，该电话号码尚未添加。

\documentclass{letter}
\usepackage{hyperref}
\signature{Joe Bloggs}
\address{21 Bridge Street \\ Smallville \\ Dunwich DU3 4WE}
\telephone{123456789}
\begin{document}
    
    \begin{letter}{Director \\ Doe \& Co \\ 35 Anthony Road
            \\ Newport \\ Ipswich IP3 5RT}
        \opening{Dear Sir or Madam:}
        
        I am writing to you on behalf of the Wikipedia project (http://www.wikipedia.org/),
        an endeavour to build a fully-fledged multilingual encyclopaedia in an entirely
        open manner, to ask for permission to use your copyrighted material.
        
        % The \ldots command produces dots in a way that will not upset
        % the typesetting of the document.
        \ldots 
        
        That said, allow me to reiterate that your material will be used to the noble end of
        providing a free collection of knowledge for everyone; naturally enough, only if you
        agree. If that is the case, could you kindly fill in the attached form and post it
        back to me? We shall greatly appreciate it.
        
        Thank you for your time and consideration.
        
        I look forward to your reply.
        
        \closing{Yours Faithfully,}
        
        \ps
        
        P.S. You can find the full text of GFDL license at
        \url{http://www.gnu.org/copyleft/fdl.html}.
        
        \encl{Copyright permission form}
        
    \end{letter}
\end{document}

为什么不显示电话号码？另外问一下，我还可以添加我的电子邮件地址吗？

Answer 1

信件文档中关于电话宏的描述如下：

以防万一某种风格把它放在信上。

要添加它，您可以例如重新定义\opening：

\documentclass{letter}
\usepackage{hyperref}
\signature{Joe Bloggs}
\address{21 Bridge Street \\ Smallville \\ Dunwich DU3 4WE}
\telephone{123456789}

\makeatletter
\renewcommand*\opening[1]{\ifx\@empty\fromaddress
  \thispagestyle{firstpage}%
    {\raggedleft\@date\par}%
  \else  % home address
    \thispagestyle{empty}%
    {\raggedleft\begin{tabular}{l@{}}\ignorespaces
      \fromaddress\\
      Phone~\telephonenum\\*[2\parskip]%
      \@date \end{tabular}\par}%
  \fi
  \vspace{2\parskip}%
  {\raggedright \toname \expandafter\\\toaddress \par}%
  \vspace{2\parskip}%
  #1\par\nobreak}
\makeatother


\begin{document}


    
    \begin{letter}{Director \\ Doe \& Co \\ 35 Anthony Road
            \\ Newport \\ Ipswich IP3 5RT}
        \opening{Dear Sir or Madam:}    
        I am writing to you on behalf of the Wikipedia project (http://www.wikipedia.org/),
        an endeavour to build a fully-fledged multilingual encyclopaedia in an entirely
        open manner, to ask for permission to use your copyrighted material.
        
        % The \ldots command produces dots in a way that will not upset
        % the typesetting of the document.
        \ldots 
        
        That said, allow me to reiterate that your material will be used to the noble end of
        providing a free collection of knowledge for everyone; naturally enough, only if you
        agree. If that is the case, could you kindly fill in the attached form and post it
        back to me? We shall greatly appreciate it.
        
        Thank you for your time and consideration.
        
        I look forward to your reply.
        
        \closing{Yours Faithfully,}
        
        \ps
        
        P.S. You can find the full text of GFDL license at
        \url{http://www.gnu.org/copyleft/fdl.html}.
        
        \encl{Copyright permission form}
        
    \end{letter}
\end{document}