error LNK2001: unresolved external symbol IID_IPOutlookApp

From:

Vincent RICHOMME <richom.v@free.fr>

Newsgroups:

microsoft.public.vc.mfc

Date:

Mon, 04 Sep 2006 21:33:35 +0200

Message-ID:

<44fc7ed1$0$27242$636a55ce@news.free.fr>

Hi,

I have ported one class from .NET into standard C++ but I have issues
with some constant.

My class is defined lke this :

#ifndef _SYSTEMWINDOWSMOBILEPOCKETOUTLOOK_H
#define _SYSTEMWINDOWSMOBILEPOCKETOUTLOOK_H

#include "System.h"

#include <objbase.h>
#include <pimstore.h>

namespace System{
    namespace WindowsMobile{
        namespace PocketOutlook{

            class PimItem;
            class Contact;
            class Appointment;
            class PimItemCollection;
            class ContactCollection;
            class Folder;
            class ContactFolder;
            class OutlookSession;

            ...

class OutlookSession
{
public:

    friend class Folder;
    friend class ContactCollection;
    friend class TaskCollection;

    OutlookSession();
    ~OutlookSession();

    bool get_IsLoggedIn() {return m_bLoggedIn; }

    //AppointmentFolder* get_Appointments();
    ContactFolder* get_Contacts();
    //EmailAccountCollection* get_EmailAccounts();
    //SmsAccount* get_SmsAccount();
    TaskFolder* get_Tasks();

protected:

    bool m_bLoggedIn;
    IPOutlookAppPtr m_pPOOMApp;
    Folder* m_pAppointmentFolder;
    Folder* m_pContactFolder;
    Folder* m_pTaskFolder;
};
        } // PocketOutlook
    } // WindowsMobile
} // System

#endif //_SYSTEMWINDOWSMOBILEPOCKETOUTLOOK_H

and inside my cpp :

OutlookSession::OutlookSession()
:m_bLoggedIn(false),
m_pAppointmentFolder(NULL),
m_pContactFolder(NULL),
m_pTaskFolder(NULL)

{
HRESULT hr = 0;
CLSID clsid;
LPOLESTR pProgID = L"PocketOutlook.Application";

hr = ::CoInitializeEx(NULL, 0);
hr = ::CLSIDFromProgID(pProgID,&clsid);

IPOutlookApp* l_pIOutlookApp;
hr = ::CoCreateInstance(clsid, 0, CLSCTX_INPROC_SERVER,
IID_IPOutlookApp, reinterpret_cast<void **>(&l_pIOutlookApp));

    if ( SUCCEEDED(hr) )
    {
        if(SUCCEEDED(m_pPOOMApp->Logon(NULL)))
        {
            m_bLoggedIn = true;
        }
    }
}

I GET the error : error LNK2001: unresolved external symbol IID_IPOutlookApp

while this symbol is defined in pimstore.h as :
EXTERN_C const GUID FAR IPOutlookApp;(GUID is a struct)

I don't understand why it cannot find it?????????