> Why I can not get the actual length from StrLen_or_IndPtr,the last paramter
> of SQLBindCol(). The value of it always keep the input one.
When you want to get the value? You can't get it after SQLBindCol() call.
Please read the specification at:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/odbc/htm/odbcsqlbindcol.asp
If I misunderstand your notice please correct me.
> Also, for varchar string, the return c string is with right length, while
> for fixed chars in DB, the returned c string is
> always with the fixed char length in DB, there are space appended in c
> string.
I see you have no clue what's the difference betwwen char and varchar
type in PostgreSQL. Please read the PostgreSQL manual. It isn't ODBC
related (http://www.postgresql.org/docs).
Regards,
Luf