IDirectMusicSegment::GetParam

The IDirectMusicSegment::GetParam method retrieves data from a track inside this segment.

HRESULT GetParam(
  REFGUID rguidType,
  DWORD dwGroupBits,
  DWORD dwIndex,
  MUSIC_TIME mtTime, 
  MUSIC_TIME* pmtNext,
  void* pParam
);
 

Parameters

rguidType

Reference to (C++) or address of (C) the identifier of the type of data to obtain. See Track Parameter Types.

dwGroupBits

Group the desired track is in. Use 0xFFFFFFFF for all groups. For more information, see Identifying the Track.

dwIndex

Index of the track in the group identified by dwGroupBits from which to obtain the data.

mtTime

Time from which to obtain the data.

pmtNext

Address of a variable to receive the segment time (relative to mtTime) until which the data is valid. If this returns a value of 0, it means either that the data will always be valid, or that it is unknown when it will become invalid. If this information is not needed, pmtNext can be set to NULL. See Remarks.

pParam

Address of an allocated structure in which the data is to be returned. The structure must be of the appropriate kind and size for the data type identified by rguidType.

Return Values

If the method succeeds, the return value is S_OK.

If it fails, the method may return one of the following error values:

Remarks

The data can become invalid before the time returned in *pmtNext if another control segment is cued. For more information on control segments, see Segments.

QuickInfo

  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in dmusici.h.

See Also

IDirectMusicPerformance::GetParam, IDirectMusicSegment::SetParam, IDirectMusicTrack::GetParam, Music Parameters