DB Connection Problem

[ktmdwn]

i had this Problem, DB Connection fail!

O.S :Windows_XP
tool :Qt_Program(Ver. 4.3.3) installed on VisualStudio 2005
DataBase : Oracle 10g

I want to Connect DataBase , this is my source code

frist, i added Qt Module(Sql)

#include <QtSql>
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QSqlQueryModel>
 
QSqlDatabase db;
db = QSqlDatabase::addDatabase("QOCI");
db.setHostName("192.168.1.223");
db.setDatabaseName("SSS");
db.setPort(1521);
db.setUserName("kkkk");
db.setPassword("1111");
bool ok = db.open();

#include <QtSql>
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QSqlQueryModel>

QSqlDatabase db;
db = QSqlDatabase::addDatabase("QOCI");
db.setHostName("192.168.1.223");
db.setDatabaseName("SSS");
db.setPort(1521);
db.setUserName("kkkk");
db.setPassword("1111");
bool ok = db.open();

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and....... This defined tnsname.ora file

SSS =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.223)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = SSS)
    )
  )

SSS =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.223)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = SSS)
    )
  )

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compile Result : No error , but ok's value is false!

so... what's is the problem?