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titleps \setfoot 出现奇怪错误

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titleps \setfoot 出现奇怪错误

我正在尝试编译这个：

\documentclass{minimal}
\usepackage{graphicx}
\usepackage{titleps}

\newpagestyle{mystyle}{
    \setfoot{}{}{\includegraphics[width=30mm]{logo}}
}
\pagestyle{mystyle}

\begin{document}

Test.

\end{document}

但失败了：

This is pdfTeX, Version 3.14159265-2.6-1.40.18 (TeX Live 2017) (preloaded format=pdflatex)
 restricted \write18 enabled.
entering extended mode
(./mwe.tex
LaTeX2e <2017-04-15>
Babel <3.10> and hyphenation patterns for 84 language(s) loaded.
(/usr/local/texlive/2017/texmf-dist/tex/latex/base/minimal.cls
Document Class: minimal 2001/05/25 Standard LaTeX minimal class
) (/usr/local/texlive/2017/texmf-dist/tex/latex/graphics/graphicx.sty
(/usr/local/texlive/2017/texmf-dist/tex/latex/graphics/keyval.sty)
(/usr/local/texlive/2017/texmf-dist/tex/latex/graphics/graphics.sty
(/usr/local/texlive/2017/texmf-dist/tex/latex/graphics/trig.sty)
(/usr/local/texlive/2017/texmf-dist/tex/latex/graphics-cfg/graphics.cfg)
(/usr/local/texlive/2017/texmf-dist/tex/latex/graphics-def/pdftex.def
(/usr/local/texlive/2017/texmf-dist/tex/generic/oberdiek/infwarerr.sty)
(/usr/local/texlive/2017/texmf-dist/tex/generic/oberdiek/ltxcmds.sty))))
(/usr/local/texlive/2017/texmf-dist/tex/latex/titlesec/titleps.sty
(/usr/local/texlive/2017/texmf-dist/tex/latex/titlesec/ttlps.def))

! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...

l.8 \pagestyle{mystyle}

?

但是如果我将移动\includegraphics到的第二个参数\setfoot，那么它就可以工作：

\setfoot{}{\includegraphics[width=30mm]{logo}}{}

我读了titleps文档，但没有找到任何可以解释这一点的内容，但我可能忽略了一些显而易见的东西。有什么提示吗？

答案1

由于某些原因， 的可选参数会使\includegraphics的工作产生混淆\pagestyle。添加括号：

\newpagestyle{mystyle}{%
    \setfoot{}{}{{\includegraphics[width=30mm]{logo}}}%
}

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