Converting counters?

["Zhichu Chen" <zhichu.chen@gmail.com>]

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Hi,

I'm trying to convert the counter to Chinese character one on one, like
0->a, 1->b, etc., so 10 will be "ba" (I use a, b, c, . . . to denote the
Chinese
glyphs which makes more sense for you). I used some codes like:
======================================================
\def\ChineseZero {o}
\def\ChineseOne  {a}
\def\ChineseTwo  {b}
\def\ChineseThree{c}
\def\ChineseFour {d}
\def\ChineseFive {e}
\def\ChineseSix  {f}
\def\ChineseSeven{g}
\def\ChineseEight{h}
\def\ChineseNine {i}

\unexpanded\def\zhnumber
  {\bgroup
   \catcode`\0=\active \uccode`\~=`\0 \uppercase{\let~\ChineseZero}%
   \catcode`\1=\active \uccode`\~=`\1 \uppercase{\let~\ChineseOne}%
   \catcode`\2=\active \uccode`\~=`\2 \uppercase{\let~\ChineseTwo}%
   \catcode`\3=\active \uccode`\~=`\3 \uppercase{\let~\ChineseThree}%
   \catcode`\4=\active \uccode`\~=`\4 \uppercase{\let~\ChineseFour}%
   \catcode`\5=\active \uccode`\~=`\5 \uppercase{\let~\ChineseFive}%
   \catcode`\6=\active \uccode`\~=`\6 \uppercase{\let~\ChineseSix}%
   \catcode`\7=\active \uccode`\~=`\7 \uppercase{\let~\ChineseSeven}%
   \catcode`\8=\active \uccode`\~=`\8 \uppercase{\let~\ChineseEight}%
   \catcode`\9=\active \uccode`\~=`\9 \uppercase{\let~\ChineseNine}%
   \loggingall
   \dozhnumber }

\def\stripunwantedspaces{}

\def\dozhnumber#1%
  {\expandafter\scantokens\expandafter
        {\detokenize{#1\stripunwantedspaces}}\egroup}
======================================================
It works fine with \zhnumber{15}, it gives "ae" which is exactly what I
want.
But it won't work in the following situation:
++++++++++++++++++++++++++
\newcount\tcpageno
\advance\tcpageno15
\zhnumber{\number\tcpageno}
++++++++++++++++++++++++++
I know it's not weird, I just don't know how to expand the counter to
number.


Thank you in advance.

-- 
Best Regards
Chen
----------------------------------------------------------------

Zhi-chu Chen | Shanghai Synchrotron Radiation Facility
No. 2019 | Jialuo Rd. | Jiading | Shanghai | P.R. China
tel: 086 21 5955 3405 | zhichu.chen.googlepages.com
| www.sinap.ac.cn
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