waveOutWrite - Win32 Multimedia Programmer's Reference

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waveOutWrite

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

MMRESULT waveOutWrite(

HWAVEOUT hwo,
LPWAVEHDR pwh,
UINT cbwh
);

Parameters
hwo

Handle of the waveform-audio output device.

pwh

Address of a WAVEHDR structure containing information about the data block.

cbwh

Size, in bytes, of the WAVEHDR structure.

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

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.

See Also
WAVEHDR, waveOutPrepareHeader, waveOutPause

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