c++ ADO 连接ORACLE 数据库 windows系统验证方式连接老是失败.

OLE DB Provider for Oracle (from Oracle).
For Standard security:
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strConnect = _T("Provider=OraOLEDB.Oracle;Data Source=MyOracleDB;"
"User Id=myUsername;Password=myPassword;");
For a Trusted connection:
OS Authenticated connect setting user ID to "/":
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strConnect = _T("Provider=OraOLEDB.Oracle;Data Source=MyOracleDB;"
"User Id=/;Password=;");
OS Authenticated connect using OSAuthent:
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strConnect = _T("Provider=OraOLEDB.Oracle;Data Source=MyOracleDB;OSAuthent=1;")
Note: "Data Source=" must be set to the appropriate Net8 name which is known to the naming method in use. For example, for Local Naming, it is the alias in the tnsnames.ora file; for Oracle Names, it is the Net8 Service Name.
For more information, see: Oracle Provider for OLE DB Developer's Guide.

求大神指导啊，好几天了，就是无法用系统的验证连接数据库(Administrator用户已经加入到SYSDBA组里面了的）