当我想进行邮件合并时，\label{}我\footref{}收到了警告There were multiply-defined labels，并且引用指向具有相同名称的最后一个标签。
我搜索了解决方案，但没有找到任何解决方案。这是我的代码：
\documentclass[english]{scrartcl}
\usepackage[colorlinks]{hyperref}
\usepackage{xspace}
\usepackage[paperheight=5cm,paperwidth=10cm, margin=0.5cm]{geometry}
\parindent 0pt % no space for the first line of a paragraph
% ---------- informations to read from the file ---------
\def\chopline#1,#2,#3 \\{ % number of arguments per line
\def\salutation{#1} % Sir/Mrs
\def\firstname{#2\xspace}
\def\lastname{#3\xspace}
}
\newif\ifmore % defines a new "if" of the name "more"
\moretrue % sets more to true
\begin{document}
\newread\source % creates a new variable "source"
\openin\source=path/datas.csv % opens a data file
\loop % runs until the end of file (EOF)
\read\source to \line % reads every line
\ifeof\source % in the case the EOF is reached
\global\morefalse % setzt more auf false
\else
\expandafter\chopline\line\\ % breaks datas into lines
Dear \salutation \lastname,
\bigskip
here is the first Information\footnote{\label{fn:informations}special informations} and then we want to show another one\footnote{another information}.
\newpage
After that we reference back to the first one\footref{fn:informations}.
\setcounter{footnote}{0}% resets counter for footnotes to zero
\fi % end of if-else
\ifmore\newpage\repeat % creates a new site and goes back to loop
\closein\source % closes data file
\end{document}
其datas.csv内容如下：
Mr., James, Bond
Mrs., Ada, Lovelace
问题是，\footref{fn:informations}詹姆斯邮件中第一个脚注的第二次调用指向艾达邮件的引用。
答案1
因此，我想到不仅要给每个标签赋予名称，还要赋予一个数字，并且每次都会增加该数字。
\documentclass[english]{scrartcl}
\usepackage[colorlinks]{hyperref}
\usepackage{xspace}
\usepackage[paperheight=5cm,paperwidth=10cm, margin=0.5cm]{geometry}
\newcommand{\Label}[1]{\label{#1\number\PersonNo}}
\newcommand{\Footref}[1]{\footref{#1\number\PersonNo}}
\parindent 0pt % no space for the first line of a paragraph
% ---------- informations to read from the file ---------
\def\chopline#1,#2,#3 \\{ % number of arguments per line
\def\salutation{#1} % Sir/Mrs
\def\firstname{#2\xspace}
\def\lastname{#3\xspace}
}
\newcount\PersonNo % counter for each person, it is necessary, that no label is created twice
\PersonNo=0 % starts with zero
\newif\ifmore % defines a new "if" of the name "more"
\moretrue % sets more to true
\begin{document}
\newread\source % creates a new variable "source"
\openin\source=path/datas.csv % opens a data file
\loop % runs until the end of file (EOF)
\read\source to \line % reads every line
\ifeof\source % in the case the EOF is reached
\global\morefalse % setzt more auf false
\else
\expandafter\chopline\line\\ % breaks datas into lines
Dear \salutation \lastname,
\bigskip
here is the first Information\footnote{\Label{fn:informations}special informations} and then we want to show another one\footnote{another information}.
\newpage
After that we reference back to the first one\Footref{fn:informations}.
\setcounter{footnote}{0}% resets counter for footnotes to zero
\advance\PersonNo by 1 % increases person counter by 1
\fi % end of if-else
\ifmore\newpage\repeat % creates a new site and goes back to loop
\closein\source % closes data file
\end{document}
现在每个标签都是唯一的，因为名称和编号的组合。您只需通过以下方式创建和引用标签：\Label{name}和\Footref{name}。