waveInPrepareHeader

The waveInPrepareHeader function prepares a buffer for waveform-audio input.

MMRESULT waveInPrepareHeader(
  HWAVEIN hwi,    
  LPWAVEHDR pwh,  
  UINT cbwh       
);

Parameters

hwi

Handle to the waveform-audio input device.

pwh

Pointer to a WAVEHDR structure that identifies the buffer 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.

Value Description
MMSYSERR_INVALHANDLE Specified device handle is invalid.
MMSYSERR_NODRIVER No device driver is present.
MMSYSERR_NOMEM Unable to allocate or lock memory.

Remarks

The lpData, dwBufferLength, and dwFlags members of the WAVEHDR structure must be set before calling this function (dwFlags must be zero).

Requirements

  Windows NT/2000/XP: Included in Windows NT 3.1 and later.
  Windows 95/98/Me: Included in Windows 95 and later.
  Header: Declared in Mmsystem.h; include Windows.h.
  Library: Use Winmm.lib.

See Also

Waveform Audio, Waveform Functions

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