waveInPrepareHeader function

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

Syntax

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 value

Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error values include the following.

Return code	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

Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Header	Mmsystem.h (include Windows.h)
Library	Winmm.lib
DLL	Winmm.dll

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