데이터 타입 - MFC

 // BSTR

COleVariant // VARIANT

COleCurrency // CURRENCY (VT_CY)
COleDateTime // DATE (VT_DATE)

COleSafeArray // SAFEARRAY

.GetUBound()
.GetElement()

OLE_HANDLE

HWND

      //Create the SAFEARRAY from the VARIANT ret.
      COleSafeArray sa(ret);

      //Determine the array's dimensions.
      long lNumRows;
      long lNumCols;
      sa.GetUBound(1, &lNumRows);
      sa.GetUBound(2, &lNumCols);

      //Display the elements in the SAFEARRAY.
      long index[2];
      VARIANT val;
      int r, c;
      TRACE("Contents of SafeArray\n");
      TRACE("=====================\n\t");
      for(c=1;c<=lNumCols;c++)
      {
         TRACE("\t\tCol %d", c);
      }
      TRACE("\n");
      for(r=1;r<=lNumRows;r++)
      {
         TRACE("Row %d", r);
         for(c=1;c<=lNumCols;c++)
         {
            index[0]=r;
            index[1]=c;
            sa.GetElement(index, &val);
            switch(val.vt)
            {
            case VT_R8:
               {
                  TRACE("\t\t%1.2f", val.dblVal);
                  break;
               }
            case VT_BSTR:
               {
                  TRACE("\t\t%s",(CString)val.bstrVal);
                  break;
               }

            case VT_EMPTY:
               {
                  TRACE("\t\t<empty>");
                  break;
               }
            }
         }
         TRACE("\n");
      }