Use total number of pages in beamer as counter

Question

I'm trying to set a count in latex on the total number of pages:
newcountmypagecount
mypagecount=insertpresentationendpage

But whenver I do this, it auto "prints" the total number of pages instead of putting the number as a count. Is there a way to set it as a count?
Here is more precisely what I'm trying to do:
newcountmypagenum
newcountmypagecount
newdimenbarwidth

mypagenum=insertpagenumber
mypagecount=insertpresentationendpage
barwidth=paperwidth

multiplybarwidth by mypagenum                                       
dividebarwidth by mypagecount

I tried with counters, but that threw errors as well:
newcounter{mypagecount}
setcounter{mypagecount}{insertpresentationendpage}

Any ideas how I can do the division at the end if I can't use these numbers and/or how to actually use these numbers?

Skillmon · Accepted Answer

The following does essentially the same as the current version of insertpresentationendpage of beamer, but in a way such that your counter is set instead of the result printed. I also included a proof of concept progress bar output.
documentclass[]{beamer}

newlengthbarwidth
newlengthtmpbarwidth
newcountmypagecount

makeatletter
newcommand*progressbar
  {%
    ifnummypagecount=0
      ifxbeamer@startpageofappendix@empty
        mypagecount=beamer@endpageofdocumentrelax
      else
        mypagecount=beamer@startpageofappendixrelax
        advancemypagecountm@ne
      fi
      ifnummypagecount=0
        globalmypagecount=1
      else
        globalmypagecount=mypagecount
      fi
    fi
    begingroup
      tmpbarwidthinsertpagenumberbarwidth
      dividetmpbarwidthmypagecount
      rule{tmpbarwidth}{5pt}%
      advancebarwidth-tmpbarwidth
      textcolor{gray}{rule{barwidth}{5pt}}%
    endgroup
  }
makeatother

setlengthbarwidth{5cm}

begin{document}
begin{frame}
  progressbar
end{frame}
begin{frame}
  progressbar
end{frame}
begin{frame}
  progressbar
end{frame}
begin{frame}
  progressbar
end{frame}

end{document}

Use total number of pages in beamer as counter

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