Creating MAPI Property with CreateIProp

[ReinerWolff]

Hello,

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

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;
			
}

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

[ReinerWolff]

can anybody help me?