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结合 \obeyspaces 和 \read

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结合 \obeyspaces 和 \read

似乎不可能以下列方式组合\obeyspaces和：\read

\newread\myread
\openin\myread=myfile.txt
  \obeyspaces  % Deleting this line removes the error
  \read\myread to \myinput
  \myinput
\closein\myread

这\tracingall对我理解问题没有什么帮助。

答案1

您只需保留\read语法周围的正常空格：

\newread\myread
  \def\doread#1#2{\immediate\read#1 to #2}
\immediate\openin\myread=myfile.txt
  {\obeyspaces
   \doread\myread\myinput\immediate\write20{\myinput}%
   \doread\myread\myinput\immediate\write20{\myinput}%
   \doread\myread\myinput\immediate\write20{\myinput}%
   \doread\myread\myinput\immediate\write20{\myinput}%
}
\immediate\closein\myread

\bye

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