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The waveOutUnprepareHeader function cleans up the preparation performed by the waveOutPrepareHeader function. This function must be called after the device driver is finished with a data block. You must call this function before freeing the buffer.

Declare Function waveOutUnprepareHeader Lib "winmm.dll" Alias "waveOutUnprepareHeader" (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 identifying the data block to be cleaned up.

- 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_STILLPLAYING The data block pointed to by the pwh parameter is still in the queue.

Last update: 07 April 2006