Creates an IStream object from a memory buffer using SHCreateMemStream.
_SHCreateMemStream($pBuffer, $cbInit)
| $pBuffer | Pointer to the memory buffer. |
| $cbInit | Size of the initial data in the buffer. |
| Success: | IStream COM object. |
| Failure: | 0, sets @error to: 1 - Invalid buffer. 2 - DllCall failed. 3 - Failed to create COM object. |