mixerGetControlDetails

Article
12/10/2007

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

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 Values

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

Value	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

**  Windows NT/2000/XP:** Included in Windows NT 3.1 and later.
**  Windows 95/98/Me:** Included in Windows 95 and later.
**  Header:** Declared in Mmsystem.h; include Windows.h.
**  Library:** Use Winmm.lib.
**  Unicode:** Implemented as Unicode and ANSI versions on Windows NT/2000/XP.

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