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 |