Creating MAPI Property with CreateIProp

Hello,

I have a problem creating a MAPI property.
I have code like this:

Code:

---

int        SetProperty( LPPROFSECT lpProfileSection, LPSPropValue lpPropValue) {
        HRESULT hr;
       
        LPPROPDATA lpPropData;
        SPropValue spvEID;

        //printf("Server DN: %d\n", lpPropValue->Value.b); for good select auto
                        cout << "CustomBook: PropValue " << lpPropValue << endl;

                lpPropValue->Value.l = false;

                if (SUCCEEDED(hr = HrSetOneProp(lpProfileSection, lpPropValue)))

                        return S_OK; // good

                else
                        spvEID.ulPropTag = PR_AB_CHOOSE_DIRECTORY_AUTOMATICALLY;
                        spvEID.Value.l = 0;
                        CreateIProp (NULL,MAPIAllocateBuffer, MAPIAllocateMore, MAPIFreeBuffer, 0,  &lpPropData);

                        //lpPropData.Tag = spvEID;

                        cout << "CustomBook: HrSetOneProp failed (hr=" << hr << ")" << endl ;
                        return 3;
                       
}

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I want to create the choose_directory_Automatically property if its not exists.
But I don't know how.
If the CreateIProp method returns me a pointer in lpPropData how can I put the PropTag and the Value in it?

I am totally new to C++ (normally I do programming in VB, VB.net and T-SQL) and its driving me crazy for days now.
Can anybody help me coding these few lines of code?
I have already implemented change the property if it exists already but the Outlook Addressbook stays on automatically until I or the user creates this property.
I took a look with OutlookSpy at this property but I could not come any further.

Plese help me.
Thanks in advance
Regards
Reiner

can anybody help me?