IDirectMusicBuffer::PackStructured

The IDirectMusicBuffer::PackStructured method inserts fixed-length data (typically a MIDI channel message), along with timing and routing information, into the buffer.

HRESULT PackStructured(
  REFERENCE_TIME rt,
  DWORD dwChannelGroup,
  DWORD dwChannelMessage
);
 

Parameters

rt

Absolute time of the message. See Remarks.

dwChannelGroup

Channel group to which the data belongs.

dwChannelMessage

Data (MIDI message) to pack.

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

At least 32 bytes (the size of DMUS_EVENTHEADER plus dwChannelMessage) must be free in the buffer.

The rt parameter must contain the absolute time at which the data is to be sent to the port. To play a message "now," retrieve the time from the latency clock and use this as rt. See IDirectMusicPort::GetLatencyClock.

Messages stamped with the same time do not necessarily play in the same order in which they were placed in the buffer.

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 dmusicc.h.

See Also

IDirectMusicBuffer::PackUnstructured