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waveOutWrite function (mmeapi.h)

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The waveOutWrite function sends a data block to the given waveform-audio output device.

Syntax

MMRESULT waveOutWrite(
  HWAVEOUT  hwo,
  LPWAVEHDR pwh,
  UINT      cbwh
);

Parameters

hwo

Handle to the waveform-audio output device.

pwh

Pointer to a WAVEHDR structure containing information about the data block.

cbwh

Size, in bytes, of the WAVEHDR structure.

Return value

Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error values include the following.

Return code Description
MMSYSERR_INVALHANDLE
 Specified device handle is invalid.
MMSYSERR_NODRIVER
 No device driver is present.
MMSYSERR_NOMEM
 Unable to allocate or lock memory.
WAVERR_UNPREPARED
 The data block pointed to by the pwh parameter hasn't been prepared.

Remarks

When the buffer is finished, the WHDR_DONE bit is set in the dwFlags member of the WAVEHDR structure.

The buffer must be prepared with the waveOutPrepareHeader function before it is passed to waveOutWrite. Unless the device is paused by calling the waveOutPause function, playback begins when the first data block is sent to the device.

Requirements

Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header mmeapi.h (include Windows.h)
Library Winmm.lib
DLL Winmm.dll

See also

Waveform Audio

Waveform Functions