Microsoft DirectX 9.0

IDirectMusicBuffer8::PackStructured

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

Syntax

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 can return one of the error values shown in the following table.

Return code
DMUS_E_INVALID_EVENT
E_OUTOFMEMORY

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 immediately, retrieve the time from the latency clock, and use this as rt. See IDirectMusicPort8::GetLatencyClock.

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

Requirements

  Header: Declared in dmusicc.h.

See Also