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mixerGetLineControls
The mixerGetLineControls function retrieves one or more controls associated with an audio line.
MMRESULT mixerGetLineControls(
HMIXEROBJ hmxobj,
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| LPMIXERLINECONTROLS pmxlc,
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| DWORD fdwControls
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| );
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|
Parameters
hmxobj
Handle of the mixer device object that is being queried.
pmxlc
Address of a MIXERLINECONTROLS structure. This structure is used to reference one or more MIXERCONTROL structures to be filled with information about the controls associated with
an audio line. The cbStruct member of the MIXERLINECONTROLS structure must always be initialized to be the size, in bytes, of the MIXERLINECONTROLS structure.
fdwControls
Flags for retrieving information about one or more controls associated with an
audio line. The following values are defined:
MIXER_GETLINECONTROLSF_ALL
The pmxlc parameter references a list of MIXERCONTROL structures that will receive information on all controls associated with the
audio line identified by the dwLineID member of the MIXERLINECONTROLS structure. The cControls member must be initialized to the number of controls associated with the
line. This number is retrieved from the cControls member of the MIXERLINE structure returned by the mixerGetLineInfo function. The cbmxctrl member must be initialized to the size, in bytes, of a single MIXERCONTROL structure. The pamxctrl member must point to the first MIXERCONTROL structure to be filled. The dwControlID and dwControlType members are ignored for this query.
MIXER_GETLINECONTROLSF_ONEBYID
The pmxlc parameter references a single MIXERCONTROL structure that will receive information on the control identified by the dwControlID member of the MIXERLINECONTROLS structure. The cControls member must be initialized to 1. The cbmxctrl member must be initialized to the size, in bytes, of a single MIXERCONTROL structure. The pamxctrl member must point to a MIXERCONTROL structure to be filled. The dwLineID and dwControlType members are ignored for this query. This query is usually used to refresh a
control after receiving a MM_MIXM_CONTROL_CHANGE control change notification message by the user-defined callback (see mixerOpen).
MIXER_GETLINECONTROLSF_ONEBYTYPE
The mixerGetLineControls function retrieves information about the first control of a specific class
for the audio line that is being queried. The pmxlc parameter references a single MIXERCONTROL structure that will receive information about the specific control. The audio
line is identified by the dwLineID member. The control class is specified in the dwControlType member of the MIXERLINECONTROLS structure.
The dwControlID member is ignored for this query. This query can be used by an application to
get information on a single control associated with a line. For example, you
might want your application to use a peak meter only from a waveform-audio
output line.
MIXER_OBJECTF_AUX
The hmxobj parameter is an auxiliary device identifier in the range of zero to one less
than the number of devices returned by the auxGetNumDevs function.
MIXER_OBJECTF_HMIDIIN
The hmxobj parameter is the handle of a MIDI input device. This handle must have been
returned by the midiInOpen function.
MIXER_OBJECTF_HMIDIOUT
The hmxobj parameter is the handle of a MIDI output device. This handle must have been
returned by the midiOutOpen function.
MIXER_OBJECTF_HMIXER
The hmxobj parameter is a mixer device handle returned by the mixerOpen function. This flag is optional.
MIXER_OBJECTF_HWAVEIN
The hmxobj parameter is a waveform-audio input handle returned by the waveInOpen function.
MIXER_OBJECTF_HWAVEOUT
The hmxobj parameter is a waveform-audio output handle returned by the waveOutOpen function.
MIXER_OBJECTF_MIDIIN
The hmxobj parameter is the identifier of a MIDI input device. This identifier must be
in the range of zero to one less than the number of devices returned by the midiInGetNumDevs function.
MIXER_OBJECTF_MIDIOUT
The hmxobj parameter is the identifier of a MIDI output device. This identifier must be
in the range of zero to one less than the number of devices returned by the midiOutGetNumDevs function.
MIXER_OBJECTF_MIXER
The hmxobj parameter is the identifier of a mixer device in the range of zero to one
less than the number of devices returned by the mixerGetNumDevs function. This flag is optional.
MIXER_OBJECTF_WAVEIN
The hmxobj parameter is the identifier of a waveform-audio input device in the range of
zero to one less than the number of devices returned by the waveInGetNumDevs function.
MIXER_OBJECTF_WAVEOUT
The hmxobj parameter is the identifier of a waveform-audio output device in the range of
zero to one less than the number of devices returned by the waveOutGetNumDevs function.
Return Values
Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error
values include the following:
MIXERR_INVALCONTROL
| The control reference is invalid.
| MIXERR_INVALLINE
| The audio line reference is invalid.
| MMSYSERR_BADDEVICEID
| The hmxobj parameter specifies an invalid device identifier.
| MMSYSERR_INVALFLAG
| One or more flags are invalid.
| MMSYSERR_INVALHANDLE
| The hmxobj parameter specifies an invalid handle.
| MMSYSERR_INVALPARAM
| One or more parameters are invalid.
| MMSYSERR_NODRIVER
| No mixer device is available for the object specified by hmxobj.
|
See Also
MIXERLINECONTROLS, MIXERCONTROL, MIXERLINE, mixerGetLineInfo, MM_MIXM_CONTROL_CHANGE, mixerOpen, auxGetNumDevs, midiInOpen, midiOutOpen, waveInOpen, waveOutOpen, midiInGetNumDevs, midiOutGetNumDevs, mixerGetNumDevs, waveInGetNumDevs, waveOutGetNumDevs
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