1

I would like to provide the follwing class:

\ProvidesClass{pdfatest}[2018/04/12 V0.1 PDF/A Test]
\LoadClass[a4paper,11pt]{article}

\newcommand{\cnumber}[1]{\def\@cnumber{#1}}
\newcommand{\cauthor}[1]{\def\@cauthor{#1}}

% Set PDF/A properties using pdfx and filecontens packages
\usepackage[a-3b]{pdfx}
\RequirePackage{filecontents}
\begin{filecontents}{\jobname.xmpdata}
    \Title{Certificate of Calibration No \@cnumber} % not working because \@cnumber not defined
    \Author{\@cauthor} % not working because \@cauthor not defined
\end{filecontents}

The problem is that I can't set the \Title and \Author inside the filecontents block when I'm using variables \@....

Using \hypersetup inside \AtBeginDocument I was able to set the properties, see the following code:

% Set PDF properties using the hyperref package.
% Not used, because it's not working with PDF/A.
\usepackage{hyperref}
\AtBeginDocument{
    \hypersetup{
        pdftitle=Certificate of Calibration No \@cnumber,
        pdfauthor=\@cauthor
    }
}

I tried as well to put filecontents block inside \AtBeginDocument. But I get an Undefined control sequence error if I do that.

I'm using my class for example like that:

\documentclass{pdfatest}

\cnumber{123-45678}
\cauthor{My Name}

\begin{document}
Bla bla ...
\end{document}

Any ideas how I can use the filecontents block with variables in my class definition?

2

The pdfx package should be loaded at the end of the preamble, this prevents \Title etc. being undefined when \begin{filecontents}...\end{filecontents} is used.

So load the etoolbox package and wrap the loading of pdfx into \AtEndPreamble.

The \@c.... macros are written unexpanded anyway and only expanded at the time of writing the meta data.

\ProvidesClass{pdfatest}[2018/04/12 V0.1 PDF/A Test]
\LoadClass[a4paper,11pt]{article}


\newcommand{\cnumber}[1]{\def\@cnumber{#1}}
\newcommand{\cauthor}[1]{\def\@cauthor{#1}}


% Set PDF/A properties using pdfx and filecontens packages
\RequirePackage{filecontents}

\RequirePackage{etoolbox}

\AtEndPreamble{
  \RequirePackage[a-3b]{pdfx}
}
\begin{filecontents}{\jobname.xmpdata}
  \Title{Certificate of Calibration No \@cnumber} % not working because \@cnumber not defined
  \Author{\@cauthor} % not working because \@cauthor not defined
\end{filecontents}

\endinput

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