Python控制windows系统音量实现实例
机构师 人气:0使用python可以对windows系统的音量进行读取或者设置。
平台：visual studio code
语言：python
需要的python模块：
1、pyqt5
2、ctypes：
ctypes 是 Python 的外部函数库。它提供了与 C 兼容的数据类型，并允许调用 DLL 或共享库中的函数。可使用该模块以纯
Python 形式对这些库进行封装。
这里是引用
3、comtypes：
comtypes是一个基于ctypes-ffi外部函数库的纯Python COM包
这里是引用
4、pycaw
Python核心音频WindowsAPI库
UI界面：
代码：
1、初始化音量接口
def init_vol(self):
"""初始化音量对应"""
# 音量对应关系
# 0% --- -65.25
# 55% --- -8.92
# 100% --- 0.0
self.volume_match={0: -65.25, 1: -56.99, 2: -51.67, 3: -47.74, 4: -44.62, 5: -42.03, 6: -39.81, 7: -37.89, 8: -36.17, 9: -34.63, 10: -33.24,
11: -31.96, 12: -30.78, 13: -29.68, 14: -28.66, 15: -27.7, 16: -26.8, 17: -25.95, 18: -25.15, 19: -24.38, 20: -23.65,
21: -22.96, 22: -22.3, 23: -21.66, 24: -21.05, 25: -20.46, 26: -19.9, 27: -19.35, 28: -18.82, 29: -18.32, 30: -17.82,
31: -17.35, 32: -16.88, 33: -16.44, 34: -16.0, 35: -15.58, 36: -15.16, 37: -14.76, 38: -14.37, 39: -13.99, 40: -13.62,
41: -13.26, 42: -12.9, 43: -12.56, 44: -12.22, 45: -11.89, 46: -11.56, 47: -11.24, 48: -10.93, 49: -10.63, 50: -10.33,
51: -10.04, 52: -9.75, 53: -9.47, 54: -9.19, 55: -8.92, 56: -8.65, 57: -8.39, 58: -8.13, 59: -7.88, 60: -7.63,
61: -7.38, 62: -7.14, 63: -6.9, 64: -6.67, 65: -6.44, 66: -6.21, 67: -5.99, 68: -5.76, 69: -5.55, 70: -5.33,
71: -5.12, 72: -4.91, 73: -4.71, 74: -4.5, 75: -4.3, 76: -4.11, 77: -3.91, 78: -3.72, 79: -3.53, 80: -3.34,
81: -3.15, 82: -2.97, 83: -2.79, 84: -2.61, 85: -2.43, 86: -2.26, 87: -2.09, 88: -1.91, 89: -1.75, 90: -1.58,
91: -1.41, 92: -1.25, 93: -1.09, 94: -0.93, 95: -0.77, 96: -0.61, 97: -0.46, 98: -0.3, 99: -0.15, 100: 0.0}
#音量值反对应
self.volume_match_2={-65.25:0, -56.99:1, -51.67:2, -47.74:3, -44.62:4, -42.03:5, -39.81:6,-37.89:7, -36.17:8, -34.63:9, -33.24:10,
-31.96:11, -30.78:12, -29.68:13, -28.66:14, -27.7:15, -26.8:16, -25.95:17, -25.15:18, -24.38:19, -23.65:20,
-22.96:21, -22.3:22, -21.66:23, -21.05:24, -20.46:25, -19.9:26, -19.35:27, -18.82:28, -18.32:29, -17.82:30,
-17.35:31, -16.88:32, -16.44:33, -16.0:34, -15.58:35,-15.16:36, -14.76:37, -14.37:38, -13.99:39, -13.62:40,
-13.26:41, -12.9:42, -12.56:43, -12.22:44,-11.89:45, -11.56:46, -11.24:47, -10.93:48, -10.63:49, -10.33:50,
-10.04:51, -9.75:52, -9.47:53, -9.19:54, -8.92:55, -8.65:56, -8.39:57, -8.13:58, -7.88:59, -7.63:60,
-7.38:61, -7.14:62, -6.9:63, -6.67:64, -6.44:65, -6.21:66, -5.99:67, -5.76:68, -5.55:69, -5.33:70,
-5.12:71,-4.91:72, -4.71:73, -4.5:74, -4.3:75, -4.11:76, -3.91:77, -3.72:78, -3.53:79, -3.34:80,
-3.15:81, -2.97:82, -2.79:83, -2.61:84, -2.43:85, -2.26:86, -2.09:87, -1.91:88, -1.75:89, -1.58:90,
-1.41:91, -1.25:92, -1.09:93, -0.93:94, -0.77:95, -0.61:96, -0.46:97, -0.3:98, -0.15:99, 0.0:100}
self.devices11=AudioUtilities.GetSpeakers()
self.interface=self.devices11.Activate(IAudioEndpointVolume._iid_,CLSCTX_ALL,None)
self.volum11=cast(self.interface,POINTER(IAudioEndpointVolume))
self.mute=self.volum11.GetMute()
电脑的音量虽然显示是一个整数，但实际的音量值是一个浮点数，就是上面代码里所列出的，从0到100的对应值。利用pycaw获取音频接口，然后激活，并将获取的输出转为C语言下的指针。
2、获取音量
vm=self.volum11.GetMasterVolumeLevel()
#print(vm)
vm2=round(vm,2)
#print(vm2)
vm3=self.volume_match_2[vm2]
#print(vm3)
#v1=self.volum11.GetVolumeRange()
#print(v1)
#return vm3
self.lbl1.setText(str(vm3))
获取音量，使用GetMasterVolumeLevel函数即可，这个函数获取的是一个浮点数，将浮点数作一下四舍五入的处理，小数点保留两位（与音量值数组对应），然后去数组里匹配，将对应的音量（整数）输出显示即可。
3、设置系统音量：
v11=int(v1)
self.sys_volume_value=self.volume_match[v11]
#print(self.sys_volume_value)
self.volum11.SetMasterVolumeLevel(self.sys_volume_value,None)
设置音量与获取音量正好是相反的过程，在UI界面上设置一个音量值（整数），将其代入第二个数组，来匹配真实音量值（浮点），然后将对应的音量值利用函数SetMasterVolumeLevel输入给电脑音频接口即可。
4、演示视频链接：
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