listings技巧

1. \lstdefinestyle

参考 https://blog.csdn.net/ProgramChangesWorld/article/details/52142313

我们在使用listings的时候，需要设置语言和样式。用\lstset会设置全局的变量，如果我们文章中有多种代码，那么就需要\lstdefinestyle，设置多种样式，在使用的时候选择对应的样式。

% system=ubuntu
%soft=Tex Live2015
% complie=XeLaTeX
\documentclass[a4paper,UTF8]{article}
\usepackage{listings}
\usepackage{ctex}
\usepackage{color}
\definecolor{keywordcolor}{rgb}{0.8,0.1,0.5}
\definecolor{webgreen}{rgb}{,.,}
\definecolor{bgcolor}{rgb}{0.92,0.92,0.92}

\lstdefinestyle{styleJ}{
    language=[AspectJ]Java,
    keywordstyle=\color{keywordcolor}\bfseries,
    commentstyle=\color{blue} \textit,
    showstringspaces=false,
    numbers=left,
    numberstyle=\small
}
\lstdefinestyle{styleP}{
    language=Python,
    numbers=right,
    frame=single,
    numberstyle=\small ,
}
\begin{document}
\begin{lstlisting}[style=styleJ]
public int sum(int n){
    int sum = ;
    for(int i=;i<n;i++){  //开始的
        sum += i;
    }
    return sum;
}
\end{lstlisting}

\begin{lstlisting}[style=styleP]
def fun():
    print('你好，世界') #我是注释
\end{lstlisting}

\end{document}

可以看到使用lstdefinestyle定义了两个样式，styleJ和styleP，分别是java和python的样式，在使用lstlisting环境的时候调设置了这两个样式。

如果不想把代码放在.tex文件里，也可以把代码放在单独的文件，然后使用下面的命令即可：

\lstinputlisting[style=styleJ]{code.java}

2. \listings样式1

参考 https://tex.stackexchange.com/questions/68091/how-do-i-add-syntax-coloring-to-my-c-source-code-in-beamer

\documentclass{beamer}
 \setbeamercovered{transparent}
\usepackage{listings}

\begin{document}

% Using typewriter font: \ttfamily inside \lstset
\begin{frame}[fragile]
\frametitle{Inserting source code}
\lstset{language=C++,
                basicstyle=\ttfamily,
                keywordstyle=\color{blue}\ttfamily,
                stringstyle=\color{red}\ttfamily,
                commentstyle=\color{green}\ttfamily,
                morecomment=[l][\color{magenta}]{\#}
}
\begin{lstlisting}
    #include<stdio.h>
    #include<iostream>
    // A comment
    int main(void)
    {
    printf("Hello World\n");
    return ;
    }
\end{lstlisting}
\end{frame}

\begin{frame}[fragile]
\frametitle{Inserting source code without setting typewriter}
\lstset{language=C++,
                keywordstyle=\color{blue},
                stringstyle=\color{red},
                commentstyle=\color{green},
                morecomment=[l][\color{magenta}]{\#}
}
\begin{lstlisting}
    #include<stdio.h>
    #include<iostream>
    // A comment
    int main(void)
    {
    printf("Hello World\n");
    return ;
    }
\end{lstlisting}
\end{frame}
\end{document}

第一种使用了\ttfamily，这个是一种打印机字体。

参考 https://www.tug.org/pracjourn/2006-1/schmidt/schmidt.pdf

https://tug.org/FontCatalogue/typewriterfonts.html

\ttfamilyselects a monospaced (“typewriter”) font family

3. listings样式2

参考 https://tex.stackexchange.com/questions/409705/c-code-change-the-font

\documentclass{article}
\usepackage{xcolor}
\usepackage{listings}

\colorlet{mygray}{black!}
\colorlet{mygreen}{green!!blue}
\colorlet{mymauve}{red!!blue}

\lstset{
  backgroundcolor=\color{gray!},
  basicstyle=\ttfamily,
  columns=fullflexible,
  breakatwhitespace=false,
  breaklines=true,
  captionpos=b,
  commentstyle=\color{mygreen},
  extendedchars=true,
  frame=single,
  keepspaces=true,
  keywordstyle=\color{blue},
  language=c++,
  numbers=none,
  numbersep=5pt,
  numberstyle=\tiny\color{blue},
  rulecolor=\color{mygray},
  showspaces=false,
  showtabs=false,
  stepnumber=,
  stringstyle=\color{mymauve},
  tabsize=,
  title=\lstname
}

\begin{document}

\begin{lstlisting}
#include <tesseract/baseapi.h>
#include <leptonica/allheaders.h>

int main()
{
    char *outText;

    tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();
    // Initialize tesseract-ocr with English, without specifying tessdata path
    if (api->Init(NULL, "eng")) {
        fprintf(stderr, "Could not initialize tesseract.\n");
        exit();
    }

    // Open input image with leptonica library
    Pix *image = pixRead("/usr/src/tesseract/testing/phototest.tif");
    api->SetImage(image);
    // Get OCR result
    outText = api->GetUTF8Text();
    printf("OCR output:\n%s", outText);

    // Destroy used object and release memory
    api->End();
    delete [] outText;
    pixDestroy(&image);

    return ;
}
\end{lstlisting}

\end{document}