What encoding is the wide character,UCS2, UTF-8, other?

Question

(please view using simplified chinese encode )
environment sets:
LC_CTYPE=zh_CN.GB18030 LC_ALL=zh_CN.GB18030
my C program code:
wchar_t *pwc = L"��";
main()
printf("\n [%x]", *pwc);
run it, the printing result: [2bc7]
I expect to get the UCS2 code value 0x6c49 of ����"(the character in GB2312 standar) ,but the result is wrong.
my questions:
1. What is the wide character that had be got by adding 'L' before locale character ������. Is it UCS2 , UTF-8, other code?
2. How to getting the UCS2 code of the locale character '��' by adding "L"?

Answer 1

I see your issue. I tried to reproduce this issue using sqlplus.
Setup NLS_LANG as you mentioned using WE8ISO8859P1 and connect to a UTF8 db.
[oracle@server ~]$ locale -a | grep en_US
en_US
en_US.iso88591
en_US.iso885915
en_US.utf8
[oracle@server ~]$ export LC_ALL=en_US.iso88591
[oracle@server ~]$ locale
LANG=en_US.UTF-8
LC_CTYPE="en_US.iso88591"
LC_NUMERIC="en_US.iso88591"
LC_TIME="en_US.iso88591"
LC_MEASUREMENT="en_US.iso88591"
LC_IDENTIFICATION="en_US.iso88591"
LC_ALL=en_US.iso88591
[oracle@server ~]$ echo $NLS_LANG
AMERICAN_AMERICA.WE8ISO8859P1
SQL> select value from nls_database_parameters where parameter='NLS_CHARACTERSET';
AL32UTF8
SQL> select nchr(223) from dual;
NCHR
ß
SQL> select chr(223) from dual;
ERROR:
ORA-29275: partial multibyte character
SQL> SELECT CHR (223 USING NCHAR_CS) from dual;
C
ß
SQL>  select  CONVERT('ß', 'WE8ISO8859P1','UTF8') FROM DUAL;
CO
SQL> select  CONVERT(CHR(223 USING NCHAR_CS), 'WE8ISO8859P1','UTF8') FROM DUAL;
select  CONVERT(CHR (223 USING NCHAR_CS), 'WE8ISO8859P1','UTF8') FROM DUAL
ERROR at line 1:
ORA-12703: this character set conversion is not supportedI found that beta is in WE8ISO8859P1 character set
here[url http://docs.oracle.com/cd/E11882_01/server.112/e10729/ch2charset.htm#NLSPG164]What Characters Does a Character Set Support?
But I don't really understand whats the problem in the conversion.