Question

我正在编写一个UWP应用程序，当耳机插入/拔出设备（PC或Mobile UWP）时，我需要收听耳机插头事件。

我试图处理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处理默认的设备更改事件。但对于耳机插头外壳，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无法捕获该事件。

那么请帮助分享我如何在UWP中获得耳机插件事件？非常感谢。

Answer 1

我曾尝试处理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个事件。

MainPage.xaml.cpp：

<bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
    <property name="targetObject" ref="the.message" />
    <property name="targetMethod" value="setMessage" />
    <property name="arguments">
        <list>
            <value type="java.lang.String">This message was set in importing context file</value>
        </list>
    </property>
</bean>

MainPage.xaml中：

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";
    }));

}

这是完整的演示：DeviceWatcherSample。您也可以参考Official Sample的方案2。

如何在UWP中获取耳机插件事件

1 个答案: