ODBC access driver

I am working with the Microsoft 6 Visual Studio C++ standartd edition

I have an ODBC access driver, and I got it to work in a tester program, but
I get C++ mangled names when I try to use an MFC application.

Can I get microsoft support for this.
I put these statements in a header but it still didn't work..

I would like to ask for a support but I forgot how.

extern "C" {
SQLRETURN SQL_API SQLFreeEnv(HENV );
SQLRETURN SQL_API SQLFreeConnect( HDBC);
SQLRETURN SQL_API SQLDisconnect(H DBC);
SQLRETURN SQL_API SQLFreeStmt(SQL HSTMT,SQLUSMALL INT);
SQLRETURN SQL_API SQLBindCol(SQLH STMT,SQLUSMALLI NT,SQLSMALLINT, SQLPOINTER,
SQLINTEGER,SQLI NTEGER*);
SQLRETURN SQL_API SQLFetch(SQLHST MT);
SQLRETURN SQL_API SQLAllocStmt(SQ LHDBC,SQLHSTMT* );
SQLRETURN SQL_API SQLDriverConnec t(SQLHDBC,SQLHW ND,SQLTCHAR*,SQ LSMALLINT,
SQLTCHAR*,SQLSM ALLINT,SQLSMALL INT*,SQLUSMALLI NT);
SQLRETURN SQL_API SQLAllocConnect (SQLHENV, SQLHDBC*);
SQLRETURN SQL_API SQLAllocEnv(SQL HENV*);
SQLRETURN SQL_API SQLExecDirect(S QLHSTMT,SQLTCHA R*,SQLINTEGER);
e.g.
error LNK2001: unresolved external symbol _SQLFreeEnv@4
error LNK2001: unresolved external symbol _SQLFreeConnect @4
error LNK2001: unresolved external symbol _SQLDisconnect@ 4
error LNK2001: unresolved external symbol _SQLFreeStmt@8
error LNK2001: unresolved external symbol _SQLBindCol@24
error LNK2001: unresolved external symbol _SQLFetch@4
error LNK2001: unresolved external symbol _SQLAllocStmt@8
error LNK2001: unresolved external symbol _SQLDriverConne ct@32
error LNK2001: unresolved external symbol _SQLAllocConnec t@8
error LNK2001: unresolved external symbol _SQLAllocEnv@4
error LNK2001: unresolved external symbol _SQLExecDirect@ 12

(I know some of these functions are depreciated but they worked in one but
program)

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