[XeTeX] A problem with \XeTeXglyph

[Stephen Moye]

For my own quick-and-dirty purposes, I have devised a little TeX routine to show me where the glyphs of a font are:

%!TEX TS-program =  xetex
%!TEX encoding =  UTF-8 Unicode

\font\test="Hoefler Text" at 14pt

\newcount\charcount \charcount0

\raggedright

\loop\number\charcount 
  \hbox{\test\char\charcount}
  \ifnum\charcount<1000 \advance\charcount1 \repeat

\bye

It works. I thought I might press \XeTeXglyph into service:

%!TEX TS-program =  xetex
%!TEX encoding =  UTF-8 Unicode

\font\test="Hoefler Text" at 14pt

\newcount\charcount \charcount0

\raggedright

\loop\number\charcount 
\hbox{\test\XeTeXglyph\charcount}
 \ifnum\charcount<1000 \advance\charcount1 \repeat

\bye

But that produces a page of nonsense. I guess I need to know how \XeTeXglyph works.

Thanks

SGM