| Microsoft DirectX 9.0 SDK Update (October 2004) |
The Compose method recomposes the track based on data from a segment. DirectMusic implements this method on the signpost track to compose a chord track.
Syntax
HRESULT Compose(
IUnknown* pContext,
DWORD dwTrackGroup,
IDirectMusicTrack** ppResultTrack
);
Parameters
pContext
IUnknown interface pointer of the object to use in the composition. This is usually the segment that owns this track.
dwTrackGroup
DWORD value that specifies group bits for the track. For more information on group bits, see Identifying the Track.
ppResultTrack
Address of a variable that receives the IDirectMusicTrack interface of the composed track. Use QueryInterface to obtain IDirectMusicTrack8.
Return Values
If the method succeeds, the return value is S_OK.
If it fails, the method can return one of the error values shown in the following table.
| Return code |
| E_INVALIDARG |
| E_POINTER |
Requirements
Header: Declared in dmplugin.h.
See Also