如何在 UWP 中获取耳机插入事件

Question

我正在编写一个 UWP 应用程序，当耳机从设备（PC 或移动 UWP）插入/拔出时，我需要在其中监听耳机插入事件。

我已经尝试处理MediaDevice::DefaultAudioRenderDeviceChanged 和Windows::Devices::Enumeration::DeviceWatcher。 但它们都不能按预期工作。

我可以使用MediaDevice::DefaultAudioRenderDeviceChanged 处理默认设备更改事件。但对于耳机插头盒，默认设备不会改变。因此不会触发渲染设备更改事件。

Windows::Devices::Enumeration::DeviceWatcher 也无法捕获该事件。

所以请帮忙分享一下我如何在 UWP 中获取耳机插入事件的事件？非常感谢。

Answer 1

我尝试处理 MediaDevice::DefaultAudioRenderDeviceChanged 和 Windows::Devices::Enumeration::DeviceWatcher。但它们都不能按预期工作。

您可以使用DeviceWatcher 来处理DeviceWatcher.Added 或DeviceWatcher.Removed 事件。

MainPage.xaml.cpp：

using namespace Windows::Devices::Enumeration;
using namespace Windows::UI::Core;

MainPage::MainPage()
{
    InitializeComponent();
}

void DeviceWatcherCppSample::MainPage::btnClick_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e)
{
    watcher=DeviceInformation::CreateWatcher(DeviceClass::AudioRender);
    handlerAddedToken=watcher->Added += ref new     Windows::Foundation::TypedEventHandler<DeviceWatcher ^, DeviceInformation ^>(this, &DeviceWatcherCppSample::MainPage::OnAdded);

    handlerRemovedToken= watcher->Removed += ref new Windows::Foundation::TypedEventHandler<DeviceWatcher ^, DeviceInformationUpdate ^>(this, &DeviceWatcherCppSample::MainPage::OnRemoved);
    handlerUpdatedToken= watcher->Updated += ref new Windows::Foundation::TypedEventHandler<Windows::Devices::Enumeration::DeviceWatcher ^, Windows::Devices::Enumeration::DeviceInformationUpdate ^>(this, &DeviceWatcherCppSample::MainPage::OnUpdated);
    watcher->Start();
}


void DeviceWatcherCppSample::MainPage::OnAdded(DeviceWatcher ^sender, DeviceInformation ^args)
{
    this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new Windows::UI::Core::DispatchedHandler([this, args]()
    {
        tbResult->Text = args->Name +"is Added";
    }));
}


void DeviceWatcherCppSample::MainPage::OnRemoved(DeviceWatcher ^sender, DeviceInformationUpdate ^args)
{
    this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new Windows::UI::Core::DispatchedHandler([this, args]()
    {
        tbResult->Text = args->Id + "is Removed";
    }));
}


void DeviceWatcherCppSample::MainPage::OnUpdated(Windows::Devices::Enumeration::DeviceWatcher ^sender, Windows::Devices::Enumeration::DeviceInformationUpdate ^args)
{
    this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new Windows::UI::Core::DispatchedHandler([this, args]()
    {
        tbResult->Text = args->Id + "is Updated";
    }));

}

MainPage.xaml：

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <StackPanel VerticalAlignment="Center">
        <Button Name="btnClick" Click="btnClick_Click">Click Me to Watch</Button>
        <TextBlock Name="tbResult"></TextBlock>
    </StackPanel>
</Grid>

这里是完整的演示：DeviceWatcherSample。也可以参考Official Sample的场景二。