| DirectX SDK | 
The IDirectMusicPortDownload::GetBuffer method retrieves the IDirectMusicDownload interface pointer of a buffer whose unique identifier is known.
HRESULT GetBuffer( DWORD dwDLId, IDirectMusicDownload** ppIDMDownload );
If the method succeeds, the return value is S_OK.
If it fails, the method can return one of the following error values:
| E_POINTER | 
| DMUS_E_INVALID_DOWNLOADID | 
| DMUS_E_NOT_DOWNLOADED_TO_PORT | 
  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in dmusicc.h.
IDirectMusicPortDownload::GetDLId, IDirectMusicDownload::GetBuffer, Low-Level DLS.