获取系统当前输出音量,求解
说起来有点蛋疼
就是win7下面,右下角不是有个量化的音量控制器么(小喇叭那个)
点开之后,可以看到有一个灰色的条和一个绿色的条,灰色的代表原本应该输出的音量(量化后的),绿色的代表真正输出音量,
这个怎么分别获取到呢? 音量
[解决办法]
1楼摘自MSDN98，以下摘自MSDN2008：（如有必要在MSDN2010中搜mixerGetControlDetails）
mixerGetControlDetails
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.
See Also
Audio Mixers, Audio Mixer Functions, MIXERCONTROLDETAILS, MIXERCONTROLDETAILS_LISTTEXT, auxGetNumDevs, midiInOpen, midiOutOpen, mixerOpen, waveInOpen, waveOutOpen, midiInGetNumDevs, midiOutGetNumDevs, mixerGetNumDevs, waveInGetNumDevs, waveOutGetNumDevs
