I'm trying to select a Face of a Feature in a Part document. I've gotten the Feature I wanted, but I can't seem to assign the Faces I get to my IFace object! Pardon my code and obvious lack of experience, I've only just learnt C++.

CComPtr swFace;
  VARIANT facearr = swFeat->GetFaces(); //GetFaceCount() is correct, at 3. 
  SAFEARRAY* psa = V_ARRAY(&facearr); //Variant to SafeArray
  LPDISPATCH swFacep;
  hr = SafeArrayAccessData(psa, (void **)&swFacep); //SafeArray to array of IDispatch pointers. 

At this point, I've tried the methods laid out in the Solidworks API help, but have gotten nowhere. To add: I've also tried

swFacep[i]->QueryInterface(IID_IFace2, &swFace)

But IID_IFace2 is undefined.

I'm not sure what I'm doing wrong or how to proceed. I would be grateful for any help!