mixerGetControlDetails function

项目
06/06/2016

The mixerGetControlDetails function retrieves details about a single control associated with an audio line.

Syntax

MMRESULT mixerGetControlDetails(
   HMIXEROBJ             hmxobj,
   LPMIXERCONTROLDETAILS pmxcd,
   DWORD                 fdwDetails
);

Parameters

hmxobj
Handle to the mixer device object being queried.
pmxcd
Pointer to a MIXERCONTROLDETAILS structure, which is filled with state information about the control.

fdwDetails
Flags for retrieving control details. The following values are defined.

Value	Meaning
MIXER_GETCONTROLDETAILSF_LISTTEXT	The paDetails member of the MIXERCONTROLDETAILS structure points to one or more MIXERCONTROLDETAILS_LISTTEXT structures to receive text labels for multiple-item controls. An application must get all list text items for a multiple-item control at once. This flag cannot be used with MIXERCONTROL_CONTROLTYPE_CUSTOM controls.
MIXER_GETCONTROLDETAILSF_VALUE	Current values for a control are retrieved. The paDetails member of the MIXERCONTROLDETAILS structure points to one or more details structures appropriate for the control class.
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 (Musical Instrument Digital Interface) 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 value

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

Return code	Description
MIXERR_INVALCONTROL	The control 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.

Remarks

All members of the MIXERCONTROLDETAILS structure must be initialized before calling this function.

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
Unicode and ANSI names	mixerGetControlDetailsW (Unicode) and mixerGetControlDetailsA (ANSI)

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