[Tex/LaTex] Footer cannot appear on CV using res.cls

cvresume

I'm trying to add a footer into a CV using res.cls. I use some commands to define the footer but it still doesn't work. Anyone can help me? Thanks.

% LaTeX resume using res.cls
\documentclass[line, margin]{res} 

\usepackage[utf8]{vietnam}
\usepackage{color}
\usepackage{hyperref}

\hypersetup{colorlinks, breaklinks, linkcolor=ceruleanblue, urlcolor=ceruleanblue, anchorcolor=darkpowderblue, citecolor=darkpowderblue}

%%% Redefine font type and font color of section name
\renewcommand{\sectionfont}{\scshape \textcolor{cobalt} }

\usepackage{fancyhdr}
\fancyhf{}

\lfoot{\datestyle Firstname Lastname}
\cfoot{\datestyle Page \thepage\ of \pageref{LastPage}}     % Use \thepage for counting page number
\rfoot{\datestyle Last updated: August 23, 2014}

\begin{document}
\begin{resume}

\end{resume}
\end{document}

Best Answer

That is a very old class and not included in texlive at all.

It does \pagestyle{empty} so there are no headers and footers. You can do

\pagestyle{fancy}

to use the fancyhdr settings, but then I had to define \datestyle which is used without being defined in your example

\documentclass[line, margin]{res} 

\usepackage[utf8]{vietnam}
\usepackage{color}
\usepackage{hyperref}

\hypersetup{colorlinks, breaklinks, linkcolor=ceruleanblue, urlcolor=ceruleanblue, anchorcolor=darkpowderblue, citecolor=darkpowderblue}

%%% Redefine font type and font color of section name
\renewcommand{\sectionfont}{\scshape \textcolor{cobalt} }

\usepackage{fancyhdr}
\pagestyle{fancy}
\newcommand\datestyle{???}

\fancyhf{}

\lfoot{\datestyle Firstname Lastname}
\cfoot{\datestyle Page \thepage\ of \pageref{LastPage}}     % Use \thepage for counting page number
\rfoot{\datestyle Last updated: August 23, 2014}

\begin{document}
\begin{resume}

\end{resume}
\end{document}
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