Writes out the contents of the supporting object in the specified format onto a Stream (IStream). If once-dereferenced Stream pointer is NULL, then a Stream is allocated and must be 'Release-d()' by caller.
| Name | Type | Description |
| Format | String | Input String that specifies the format of the data to be written to the stream. |
| Stream | Unknown | Input/output object from which to read the formatted data. |