在10.6之后以编程方式设置Mac OS X音量(Snow Leopard) [英] Setting Mac OS X volume programmatically after 10.6 (Snow Leopard)

问题描述

是否可以使用Objective-C设置Mac的系统音量?我尝试使用:

Is there a way to set the Mac's System Volume using Objective-C? I tried using:

AudioDeviceSetProperty([[self class]defaultOutputDeviceID],
                       NULL, //time stamp not needed
                       0, //channel 0 is master channel
                       false,  //for an output device
                       kAudioDevicePropertyVolumeScalar,
                       sizeof(Float32),
                       &volume);

但是在 OS X 10.6 (Snow  Leopard)之后，它已被弃用；有一个更好的方法吗?还是我必须满足申请量?

But it is deprecated after OS X 10.6 (Snow Leopard); is there a better way to do this? Or will I have to settle for application volume?

推荐答案

在AudioToolbox中检查音频硬件服务:

Check out Audio Hardware Services in AudioToolbox:

• AudioToolbox函数
• 音频硬件服务属性

• AudioToolbox Functions
• Audio Hardware Services Properties

以下是一些示例代码，它们假定与您的其他代码具有相同的上下文:

Here is some sample code assuming the same context as your other code:

AudioObjectPropertyAddress propertyAddress = { 
    kAudioHardwareServiceDeviceProperty_VirtualMasterVolume, 
    kAudioDevicePropertyScopeOutput,
    kAudioObjectPropertyElementMaster 
};

AudioHardwareServiceSetPropertyData([self.class defaultOutputDeviceID], 
                                    &propertyAddress, 
                                    0, 
                                    NULL, 
                                    sizeof(Float32),
                                    &volume);

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