lstlisting in landscape and heading in portrait

Question

I am trying to include some code files in landscape mode into my document which is in portrait mode. I do this using the

\usepackage{lscape}

and

\usepackage{listings}

So far so good. The problem kicks in when a new section begins. The heading is shown in portrait mode (which is fine!) followed by a blank page. On the next page the code appears. Is it possible to combine the portrait mode heading with the landscape mode code on one page? Below is a little example

\documentclass[12pt,a4paper,leqno]{book}
\usepackage[english]{babel}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{listings}
\usepackage{lscape}

\begin{document}
\section*{This is a section}
\begin{landscape}
\begin{lstlisting}
    and here comes the code
\end{lstlisting}
\end{landscape}
\end{document}

Answer 1

You could add a rotated box with a (short) listing after the section title. My answer uses the tcolorbox package for the job. The given width of the box is the height of the rotated box. Obviously, the width/height has to be small enough to fit inside the page. This solution is not adequate, if you want to the listing to continue to the next page. Any options for the listing can be put inside the listing options key.

\documentclass[12pt,a4paper,leqno]{book}
\usepackage[english]{babel}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[listings,skins]{tcolorbox}

\begin{document}
\section*{This is a section}

\begin{tcblisting}{width=19cm,listing only,blank,tikz={rotate=90},
  listing options={basicstyle=\ttfamily}}
and here comes the code
\end{tcblisting}

\end{document}