waveOutUnprepareHeader (Windows CE 5.0)
This function cleans up the preparation performed by waveOutPrepareHeader. The function must be called after the device driver is finished with a data block. You must call this function before freeing the data buffer.
MMRESULT waveOutUnprepareHeader(HWAVEOUThwo,LPWAVEHDRpwh,UINTcbwh );
Handle to the waveform-audio output device.
Pointer to a WAVEHDR structure identifying the data block to be cleaned up.
Size, in bytes, of the WAVEHDR structure.
One of the values described in the following table is returned.
|MMSYSERR_INVALHANDLE||Specified device handle is invalid.|
|MMSYSERR_NODRIVER||No device driver is present.|
|MMSYSERR_NOMEM||Unable to allocate or lock memory.|
|WAVERR_STILLPLAYING||Data block pointed to by the pwh parameter is still in the queue.|
This function complements waveOutPrepareHeader. You must call this function before freeing the buffer. After passing a buffer to the device driver with the waveOutWrite function, you must wait until the driver is finished with the buffer before calling waveOutUnprepareHeader.
Unpreparing a buffer that has not been prepared has no effect, and the function returns zero.
OS Versions: Windows CE 2.0 and later.
Link Library: Coredll.lib.
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