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The waveOutPrepareHeader function prepares a waveform-audio data block for playback.

Declare Function waveOutPrepareHeader Lib "winmm.dll" Alias "waveOutPrepareHeader" (ByVal hWaveOut As Long, lpWaveOutHdr As WAVEHDR, ByVal uSize As Long) As Long

Operating Systems Supported
Requires Windows NT 3.1 or later; Requires Windows 95 or later


Parameter Information
- hwo
Handle of the waveform-audio output device.

- pwh
Address of a WAVEHDR structure that identifies the data block to be prepared.

- 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.

Last update: 07 April 2006