在Windows 7上以编程方式更改系统范围的扬声器平衡

Question

我该如何在Windows 7上通过编程方式改变系统级扬声器平衡？

(我只会用Python和AHK编程。)

- Ram Rachum

Answer 1

快捷方式（由@AndreMiras创建）-->使用Pycaw，可以在此处找到Pycaw的用法说明。

详细步骤 -- >首先安装python包Comtypes:

1. 使用pip install comtypes

   或者

2. 从https://pypi.python.org/pypi/comtypes下载并解压缩下载文件夹。在提取的文件夹中找到setup.py文件。打开命令提示符，进入setup.py路径，然后运行命令python setup.py install。

现在只需运行code.py文件，您可以通过更改函数SetMasterVolumeLevel(-25, None)的第一个参数来调整音量，第一个参数必须在-65到0之间。 我已经在Windows 8中尝试了这段代码，希望它也能在Windows 7上工作。

请查看代码的最后一行，以找到volume.SetMasterVolumeLevel(-25, None)来调整电脑的音量。

Code.py

from comtypes import *
import comtypes.client
from ctypes import POINTER
from ctypes.wintypes import DWORD, BOOL

MMDeviceApiLib = \
    GUID('{2FDAAFA3-7523-4F66-9957-9D5E7FE698F6}')
IID_IMMDevice = \
    GUID('{D666063F-1587-4E43-81F1-B948E807363F}')
IID_IMMDeviceEnumerator = \
    GUID('{A95664D2-9614-4F35-A746-DE8DB63617E6}')
CLSID_MMDeviceEnumerator = \
    GUID('{BCDE0395-E52F-467C-8E3D-C4579291692E}')
IID_IMMDeviceCollection = \
    GUID('{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}')
IID_IAudioEndpointVolume = \
    GUID('{5CDF2C82-841E-4546-9722-0CF74078229A}')

class IMMDeviceCollection(IUnknown):
    _iid_ = GUID('{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}')
    pass

class IAudioEndpointVolume(IUnknown):
    _iid_ = GUID('{5CDF2C82-841E-4546-9722-0CF74078229A}')
    _methods_ = [
        STDMETHOD(HRESULT, 'RegisterControlChangeNotify', []),
        STDMETHOD(HRESULT, 'UnregisterControlChangeNotify', []),
        STDMETHOD(HRESULT, 'GetChannelCount', []),
        COMMETHOD([], HRESULT, 'SetMasterVolumeLevel',
            (['in'], c_float, 'fLevelDB'),
            (['in'], POINTER(GUID), 'pguidEventContext')
        ),
        COMMETHOD([], HRESULT, 'SetMasterVolumeLevelScalar',
            (['in'], c_float, 'fLevelDB'),
            (['in'], POINTER(GUID), 'pguidEventContext')
        ),
        COMMETHOD([], HRESULT, 'GetMasterVolumeLevel',
            (['out','retval'], POINTER(c_float), 'pfLevelDB')
        ),
        COMMETHOD([], HRESULT, 'GetMasterVolumeLevelScalar',
            (['out','retval'], POINTER(c_float), 'pfLevelDB')
        ),
        COMMETHOD([], HRESULT, 'SetChannelVolumeLevel',
            (['in'], DWORD, 'nChannel'),
            (['in'], c_float, 'fLevelDB'),
            (['in'], POINTER(GUID), 'pguidEventContext')
        ),
        COMMETHOD([], HRESULT, 'SetChannelVolumeLevelScalar',
            (['in'], DWORD, 'nChannel'),
            (['in'], c_float, 'fLevelDB'),
            (['in'], POINTER(GUID), 'pguidEventContext')
        ),
        COMMETHOD([], HRESULT, 'GetChannelVolumeLevel',
            (['in'], DWORD, 'nChannel'),
            (['out','retval'], POINTER(c_float), 'pfLevelDB')
        ),
        COMMETHOD([], HRESULT, 'GetChannelVolumeLevelScalar',
            (['in'], DWORD, 'nChannel'),
            (['out','retval'], POINTER(c_float), 'pfLevelDB')
        ),
        COMMETHOD([], HRESULT, 'SetMute',
            (['in'], BOOL, 'bMute'),
            (['in'], POINTER(GUID), 'pguidEventContext')
        ),
        COMMETHOD([], HRESULT, 'GetMute',
            (['out','retval'], POINTER(BOOL), 'pbMute')
        ),
        COMMETHOD([], HRESULT, 'GetVolumeStepInfo',
            (['out','retval'], POINTER(c_float), 'pnStep'),
            (['out','retval'], POINTER(c_float), 'pnStepCount'),
        ),
        COMMETHOD([], HRESULT, 'VolumeStepUp',
            (['in'], POINTER(GUID), 'pguidEventContext')
        ),
        COMMETHOD([], HRESULT, 'VolumeStepDown',
            (['in'], POINTER(GUID), 'pguidEventContext')
        ),
        COMMETHOD([], HRESULT, 'QueryHardwareSupport',
            (['out','retval'], POINTER(DWORD), 'pdwHardwareSupportMask')
        ),
        COMMETHOD([], HRESULT, 'GetVolumeRange',
            (['out','retval'], POINTER(c_float), 'pfMin'),
            (['out','retval'], POINTER(c_float), 'pfMax'),
            (['out','retval'], POINTER(c_float), 'pfIncr')
        ),

    ]

class IMMDevice(IUnknown):
    _iid_ = GUID('{D666063F-1587-4E43-81F1-B948E807363F}')
    _methods_ = [
        COMMETHOD([], HRESULT, 'Activate',
            (['in'], POINTER(GUID), 'iid'),
            (['in'], DWORD, 'dwClsCtx'),
            (['in'], POINTER(DWORD), 'pActivationParans'),
            (['out','retval'], POINTER(POINTER(IAudioEndpointVolume)), 'ppInterface')
        ),
        STDMETHOD(HRESULT, 'OpenPropertyStore', []),
        STDMETHOD(HRESULT, 'GetId', []),
        STDMETHOD(HRESULT, 'GetState', [])
    ]
    pass

class IMMDeviceEnumerator(comtypes.IUnknown):
    _iid_ = GUID('{A95664D2-9614-4F35-A746-DE8DB63617E6}')

    _methods_ = [
        COMMETHOD([], HRESULT, 'EnumAudioEndpoints',
            (['in'], DWORD, 'dataFlow'),
            (['in'], DWORD, 'dwStateMask'),
            (['out','retval'], POINTER(POINTER(IMMDeviceCollection)), 'ppDevices')
        ),
        COMMETHOD([], HRESULT, 'GetDefaultAudioEndpoint',
            (['in'], DWORD, 'dataFlow'),
            (['in'], DWORD, 'role'),
            (['out','retval'], POINTER(POINTER(IMMDevice)), 'ppDevices')
        )
    ]





enumerator = comtypes.CoCreateInstance( 
    CLSID_MMDeviceEnumerator,
    IMMDeviceEnumerator,
    comtypes.CLSCTX_INPROC_SERVER
)

print enumerator
endpoint = enumerator.GetDefaultAudioEndpoint( 0, 1 )
print endpoint
volume = endpoint.Activate( IID_IAudioEndpointVolume, comtypes.CLSCTX_INPROC_SERVER, None )
print volume
print volume.GetMasterVolumeLevel()
print volume.GetVolumeRange()
#volume.SetMasterVolumeLevel(-65, None) uncomment for 0 volume
#volume.SetMasterVolumeLevel(-1, None) uncomment for full volume
volume.SetMasterVolumeLevel(-25, None) #Change the first argument for controlling the volume remember it should be -ve not less than -65

- Himanshu dua

---

1. 太棒了。
2. 如何让它更改余额而不仅仅是音量？这就是问题所在。

- Ram Rachum

您可以使用SetChannelVolumeLevel(0,-65,None)函数来更改扬声器的平衡。请转到代码的最后一行，并添加以下行：volume.SetChannelVolumeLevel(0,-30,None)。您可以更改第二个参数以调整平衡，范围从0到-65。 - Himanshu dua

做得好！我已经创建了一个Python库https://github.com/AndreMiras/pycaw。 - Andre Miras

@AndreMiras 干得好 - Himanshu dua

有没有办法取消静音？ - Vladimir Shevyakov