Disable Unicode mode in VB6

Question

My Database characterset is AL32UTF8. In VB6, I have to use controls with some Vietnames fonts to display text. When I use MS Provider for Oracle, because it doesn't support Unicode, so if I set NLS_LANG to VN8VN3, the conversion always happens and I can happily do things like:
Text1.Font="Some Vietnamese Font"
Text1.Text= rs1.Fields("Name").Value
When I move on to OraOLEDB (to use LOB and advanced things Oracle provides), I found out that it will use Unicode mode in my case (because VN8VN3 is not a superset of AL32UTF8), so the rs1.Fields("Name").Value is encoded in UCS16 and I can't get it displayed in text boxes.
I found that I can use Oracle ODBC driver through MS Provider for ODBC, and unset "Force SQL_WCHAR for Varchar2 columnms" , but it seems to have some limits.
Any one can help me out?
Thank you very much.

Answer 1

Maybe I didn't make myself clear enough.
I'm using ADO on top of OraOLEDB to connect to Oracle 9.2. The database characterset is AL32UTF8. Since my client can't
handle Unicode characters, I need a character conversion. However, arcording to the OraOLEDB document( which can be
obtained here http://download-west.oracle.com/docs/cd/B10501_01/win.920/a95498/using.htm#1010255):
How Oracle Unicode Support Works
OraOLEDB works in two modes, Unicode mode and non-Unicode mode. When the client character set is not a superset of
the server character set, OraOLEDB automatically enables the Unicode mode. In this mode, OraOLEDB stores the data in its
cache in the UCS2 encoding scheme. The user should ensure that the database's character set is UTF8 in order to prevent
any data loss.
If the client character set is a superset of the server's, the provider operates in the non-Unicode mode. This mode provides
slightly better performance as it does not have to deal with larger character buffers required by the UCS2 encoding.
My client can only use NLS_LANG VN8VN3, which is NOT a superset of AL32UTF8, so "OraOLEDB automatically enables
the Unicode mode". So if I code like this:
Text1.Font="Some Vietnamese Font"
Text1.Text= rs1.Fields("Name").Value
the display is bad ('?' all over the place). This is because rs1.Fields("Name").Type is adVarWChar, so
rs1.Fields("Name").Value is encoded in UCS2. What I need is to make rs1.Fields("Name").Type is adVarChar, but it seem to
be impossible since Field.Type is readonly.
When I use MS provider for Oracle, I found out that rs1.Fields("Name").Type is adVarChar, so Oracle do the conversion from/to
AL32UTF8 (database character set) and VN8VN3(NLS_LANG) for me.
Since I use LOB and things that MS does not support, I want to use OraOLEDB, so anyone can help me out? It's ugent. If I
don't make myself clear enough, please let me know.
Thank you very much.