Hi,

This topic seems to be related to the bug report
   [ODBC] Localized error messages, wrong charset
.

Bruce Momjian wrote:
Added to TODO:

        Improve encoding of connection startup messages sent to the client
        
            Currently some authentication error messages are sent in the server
            encoding

It it true ?
IIRC the backend knows nothing about the server encoding in
authentication phase.

Psqlodbc Unicode driver sends connection startup message which
contains the client_encoding(=UTF8) guc parameter. Attached is
 a trial patch so that the psqlodbc Unicode driver can get
properly localized password error messages.

regards,
Hiroshi Inoue
Index: postmaster/postmaster.c
===================================================================
RCS file: /projects/cvsroot/pgsql/src/backend/postmaster/postmaster.c,v
retrieving revision 1.570
diff -c -c -r1.570 postmaster.c
*** postmaster/postmaster.c     4 Jan 2009 22:19:59 -0000       1.570
--- postmaster/postmaster.c     30 Jan 2009 14:05:35 -0000
***************
*** 1552,1557 ****
--- 1552,1560 ----
                                                                                
        pstrdup(nameptr));
                                port->guc_options = lappend(port->guc_options,
                                                                                
        pstrdup(valptr));
+                               if (stricmp(nameptr, "client_encoding") == 0 &&
+                                   stricmp(valptr, "UTF8") == 0)
+                                       
bind_textdomain_codeset(PG_TEXTDOMAIN("postgres"), "UTF-8");
                        }
                        offset = valoffset + strlen(valptr) + 1;
                }
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