导出导入一个 tex 文件中生成的值并在另一个 tex 文件中有效使用它

Question

基于这里，下面的代码应该可以工作，但是却不行。为什么？我只想将一个或两个值从一个.tex文件复制到另一个文件：12从复制A.tex到B.tex。有没有简单的方法可以做到这一点？谢谢

% % A.tex =============================

\documentclass[12pt]{article}

\usepackage{xfp}

\begin{document}

% % File write

\xdef\exportedvalue{12}
\exportedvalue % prints 12

\newwrite\file
\immediate\openout\file=myfilename.txt
% \immediate\write\file{Column}
\immediate\write\file{\fpeval{\exportedvalue}}
\closeout\file

% \end{document}

% % B.tex =============================

% \documentclass[12pt]{article}

% \usepackage{xfp}

% \begin{document}

% % File read

\newread\file
\openin\file=myfilename.txt
\loop\unless\ifeof\file
    \read\file to\fileline % Reads a line of the file into \fileline
    \xdef\importedvalue{\fpeval{\fileline}} % Do something with \fileline % when I commenting out this line (and \importedvalue), it compiles, but does not import the number
\repeat
\closein\file

\importedvalue %does not print 12 that I can reuse elsewhere in the document % when I commenting out this line (and \xdef\importedvalue{\fpeval{\fileline}}), it compiles, but does not import the number

\end{document}

Answer 1

我认为你可以安排简单地输入文件

\documentclass[12pt]{article}

\begin{document}

% % File write

\xdef\exportedvalue{12}
\exportedvalue % prints 12

\newwrite\file
\immediate\openout\file=myfilename.txt
% \immediate\write\file{Column}
\immediate\write\file{\def\noexpand\importedvalue{\fpeval{\exportedvalue}}}
\immediate\closeout\file

% \end{document}

% % B.tex =============================

% \documentclass[12pt]{article}

% \usepackage{xfp}
% \begin{document}

% % File read

\input{myfilename.txt}

\importedvalue

\end{document}