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waveOutUnprepareHeader 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.
VB4-32,5,6
Declare Function waveOutUnprepareHeader Lib "winmm.dll" Alias "waveOutUnprepareHeader" (ByVal hWaveOut As Long, lpWaveOutHdr As WAVEHDR, ByVal uSize As Long) As Long |
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Operating Systems Supported |
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Requires Windows NT 3.1 or later; Requires Windows 95 or later |
- 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. |
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. |
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