How to call a hidden default method of an OLE automation collection in Visual C++

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Sample Code

   void IterateCollection(void)
   {
      Application App; // wrapper class for the 'Application' object
      Project Proj;    // wrapper class for the 'Project' object
      Resources Res;   // wrapper class for the 'Resources' object
      CString lpszFileName ("c:\\temp\\project2.mpp");

      App.CreateDispatch("MSProject.Application");

      VARIANT vFileName;
      VariantInit(&vFileName);
      V_VT(&vFileName) = VT_BSTR;
      V_BSTR(&vFileName) = lpszFileName.AllocSysString();
      App.FileOpen(vFileName);

      Proj.AttachDispatch(App.GetActiveProject());
      Res.AttachDispatch(Proj.GetResources());

      VARIANT vCount;
      VariantInit(&vCount);
      V_VT(&vCount) = VT_I4;
      vCount = Res.Count();

      // the index of the collection starts with 1, not 0
      for (int i = 1 ; i <= vCount.lVal ; i++)
      {
         Resource r; // wrapper class for the 'Resource' object

         VARIANT vResult, vIndex, vStr;
         VariantInit(&vResult);
         VariantInit(&vIndex);
         V_VT(&vIndex) = VT_I2;
         V_I2(&vIndex) = i;
         static BYTE parms[] = VTS_VARIANT;

         Res.InvokeHelper(DISPID_VALUE, DISPATCH_METHOD, VT_VARIANT,
   (void*)&vResult, parms, &vIndex);
         r.AttachDispatch(vResult.pdispVal);

         vStr = r.GetName();
         // ... 'vStr' now contains the Name property
      }
   }