cannot mock CDatabase Open using google mock c++

I am trying to mock Cdatabase method "Open". bellow are the files where I do mock class configurations.

afxdb.h

...
    virtual BOOL Open(LPCTSTR lpszDSN, BOOL bExclusive = FALSE,
            BOOL bReadonly = FALSE, LPCTSTR lpszConnect = _T("ODBC;"),
            BOOL bUseCursorLib = TRUE);
...

mock_myCDatabase.h

...<linkers>

class mock_my_CDatabase :public CDatabase
{
public:
    mock_my_CDatabase()
    {}
    ~mock_my_CDatabase()
    {}
    **MOCK_METHOD5(Open, BOOL(LPCTSTR lpszDSN, BOOL bExclusive,BOOL bReadonly, LPCTSTR lpszConnect,BOOL bUseCursorLib));**
};

DemoClassB.cpp

    ...<linkers>
  ...
    CDemoClassB::CDemoClassB(CDatabase  &p_db)
    {
        m_db = &p_db;
    }
  ...
  ...
    **BOOL CDemoClassB::fun2()
    {
        m_db->Open((LPCTSTR)NULL, FALSE, FALSE, (LPCTSTR)"ODBC;DRIVER={MICROSOFT ACCESS DRIVER (*.mdb, *.accdb)};DSN='';DBQ=C:\\Karthik\\GMockDemo\\GMockDemo\\RepolyticsDB.accdb", CDatabase::noOdbcDialog);
            return TRUE;
    }**

GMockDemo.cpp

// GMockDemo.cpp : Defines the entry point for the console application.
//

...<linkers>

using namespace testing;
using ::testing::Return;


**TEST(mock, mockCDatabase)
{
    mock_my_CDatabase mockDb;

    EXPECT_CALL(mockDb, OpenEx((LPCTSTR)"ODBC;DRIVER={MICROSOFT ACCESS DRIVER (*.mdb, *.accdb)};DSN='';DBQ=C:\\Karthik\\GMockDemo\\GMockDemo\\RepolyticsDB.accdb", CDatabase::noOdbcDialog)).Times(8).WillRepeatedly(Return(TRUE));
    CDemoClassB m_Bt(mockDb);
    ASSERT_EQ(m_Bt.fun2(), TRUE);
}**
...
...
int _tmain(int argc, _TCHAR* argv[])
{
    ::testing::InitGoogleMock(&argc, argv);
    RUN_ALL_TESTS();
    std::getchar(); // keep console window open until Return keystroke
    return 0;
}

I am not able to mock the CDatabase method: Open . When I run the code I get

Expected: to be called once Actual: never called - unsatisfied and active

Can anyone please help me in mocking a CDatabase method