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.
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MIXERR_INVALLINE
| The audio line reference is invalid.
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MMSYSERR_BADDEVICEID
| The hmxobj parameter specifies an invalid device identifier.
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MMSYSERR_INVALFLAG
| One or more flags are invalid.
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MMSYSERR_INVALHANDLE
| The hmxobj parameter specifies an invalid handle.
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MMSYSERR_INVALPARAM
| One or more parameters are invalid.
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MMSYSERR_NODRIVER
| No mixer device is available for the object specified by hmxobj.
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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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