|
waveInOpen
The waveInOpen function opens the given waveform-audio input device for recording.
MMRESULT waveInOpen(
LPHWAVEIN phwi,
|
| UINT uDeviceID,
|
| LPWAVEFORMATEX pwfx,
|
| DWORD dwCallback,
|
| DWORD dwCallbackInstance,
|
| DWORD fdwOpen
|
| );
|
|
Parameters
phwi
Address filled with a handle identifying the open waveform-audio input device.
Use this handle to identify the device when calling other waveform-audio input
functions. This parameter can be NULL if WAVE_FORMAT_QUERY is specified for fdwOpen.
uDeviceID
Identifier of the waveform-audio input device to open. It can be either a
device identifier or a handle of an open waveform-audio input device.You can use
the following flag instead of a device identifier:
WAVE_MAPPER
The function selects a waveform-audio input device capable of recording in the
specified format.
pwfx
Address of a WAVEFORMATEX structure that identifies the desired format for recording waveform-audio
data. You can free this structure immediately after waveInOpen returns.
dwCallback
Address of a fixed callback function, an event handle, a handle to a window,
or the identifier of a thread to be called during waveform-audio recording to
process messages related to the progress of recording. If no callback function is
required, this value can be zero. For more information on the callback
function, see waveInProc.
dwCallbackInstance
User-instance data passed to the callback mechanism. This parameter is not
used with the window callback mechanism.
fdwOpen
Flags for opening the device. The following values are defined:
CALLBACK_EVENT
The dwCallback parameter is an event handle.
CALLBACK_FUNCTION
The dwCallback parameter is a callback procedure address.
CALLBACK_NULL
No callback mechanism. This is the default setting.
CALLBACK_THREAD
The dwCallback parameter is a thread identifier.
CALLBACK_WINDOW
The dwCallback parameter is a window handle.
WAVE_FORMAT_DIRECT
If this flag is specified, the ACM driver does not perform conversions on the
audio data.
WAVE_FORMAT_QUERY
The function queries the device to determine whether it supports the given
format, but it does not open the device.
WAVE_MAPPED
The uDeviceID parameter specifies a waveform-audio device to be mapped to by the wave
mapper.
Return Values
Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error
values include the following:
MMSYSERR_ALLOCATED
| Specified resource is already allocated.
| MMSYSERR_BADDEVICEID
| Specified device identifier is out of range.
| MMSYSERR_NODRIVER
| No device driver is present.
| MMSYSERR_NOMEM
| Unable to allocate or lock memory.
| WAVERR_BADFORMAT
| Attempted to open with an unsupported waveform-audio format.
|
Remarks
Use the waveInGetNumDevs function to determine the number of waveform-audio input devices present on
the system. The device identifier specified by uDeviceID varies from zero to one less than the number of devices present. The
WAVE_MAPPER constant can also be used as a device identifier.
If you choose to have a window or thread receive callback information, the
following messages are sent to the window procedure or thread to indicate the
progress of waveform-audio input: MM_WIM_OPEN, MM_WIM_CLOSE, and MM_WIM_DATA.
If you choose to have a function receive callback information, the following
messages are sent to the function to indicate the progress of waveform-audio
input: WIM_OPEN, WIM_CLOSE, and WIM_DATA.
See Also
WAVEFORMATEX, waveInGetNumDevs, waveInProc, MM_WIM_OPEN, MM_WIM_CLOSE, MM_WIM_DATA
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