Windows IoT Raspberry Pi 3 C# 枚举 USB 音频适配器

Question

我打算将 2 个或更多 USB 音频适配器（每个都带有麦克风和线路）连接到我的 raspberry pi 3. 因此我需要分别枚举音频渲染和音频捕获的音频设备并将它们显示在listbox 类似于 audioinsample 。我不明白这是怎么回事。我尝试使用下面的代码，发生了异常处理程序。请指教。谢谢。

        captureDeviceList = new ObservableCollection<DeviceInformation>();
        audioCaptureList.ItemsSource = captureDeviceList;

        renderDeviceList = new ObservableCollection<DeviceInformation>();
        audioRenderList.ItemsSource = renderDeviceList;


  private async void enumerateAudioDevice()
    {
        var renderDevices = await DeviceInformation.FindAllAsync(DeviceClass.AudioRender);

        if (renderDevices.Count > 0)
        {
            for (var i = 0; i < renderDevices.Count; i++)
            {
                renderDeviceList.Add(renderDevices[i]);
            }
            audioRenderList.SelectedItem = renderDevices[0];

        }


        var captureDevices = await DeviceInformation.FindAllAsync(DeviceClass.AudioCapture);
        if (captureDevices.Count > 0)
        {
            for (var i = 0; i < captureDevices.Count; i++)
            {
                captureDeviceList.Add(captureDevices[i]);
            }
            audioCaptureList.SelectedItem = captureDevices[0];

        }
    }

<PivotItem Header="Info">
            <Grid>
                <ListBox x:Name="audioRenderList" HorizontalAlignment="Left" Height="100" VerticalAlignment="Top" Width="288" Margin="0,25,0,0" FontSize="10"/>
                <ListBox x:Name="audioCaptureList" HorizontalAlignment="Left" Height="100" VerticalAlignment="Top" Width="288" Margin="318,25,0,0" FontSize="10"/>
                <TextBlock x:Name="renderDeviceCount" HorizontalAlignment="Left" Margin="248,0,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Width="40"/>
                <TextBlock x:Name="captureDeviceCount" HorizontalAlignment="Left" Margin="566,0,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Width="40" RenderTransformOrigin="0.425,-0.5"/>
                <TextBlock HorizontalAlignment="Left" Margin="318,0,0,0" TextWrapping="Wrap" Text="Capture Devices" VerticalAlignment="Top"/>
                <TextBlock HorizontalAlignment="Left" TextWrapping="Wrap" Text="Render Devices" VerticalAlignment="Top"/>
                <ListBox x:Name="usbList" HorizontalAlignment="Left" Height="100" Margin="0,158,0,0" VerticalAlignment="Top" Width="288"/>
                <TextBlock HorizontalAlignment="Left" TextWrapping="Wrap" Text="USB Devices" VerticalAlignment="Top" Margin="0,133,0,0"/>
                <TextBlock x:Name="usbDeviceCount" HorizontalAlignment="Left" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Margin="248,133,0,0" Width="40"/>

            </Grid>
        </PivotItem>

更新：我已经修改了我的 XAML 代码..它有效..但似乎我无法正确安排堆栈面板边距。

我的代码如下。有什么建议吗？谢谢。

<PivotItem Header="Info">
            <Grid>
                <ListBox x:Name="audioRenderList" Margin="10,28,358,144" Width="250" Height="90">
                    <ListBox.ItemTemplate>
                        <DataTemplate x:DataType="device:DeviceInformation">
                            <StackPanel Orientation="Horizontal">
                                <TextBlock Text="{x:Bind Path=Name, Mode=OneWay}" Margin="0,0,0,0" FontSize="18"/>
                            </StackPanel>
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>
                <ListBox x:Name="audioCaptureList" Margin="344,28,10,144" Width="250" Height="90">
                    <ListBox.ItemTemplate>
                        <DataTemplate x:DataType="device:DeviceInformation">
                            <StackPanel Orientation="Horizontal">
                                <TextBlock Text="{x:Bind Path=Name, Mode=OneWay}" Margin="0,0,0,0" FontSize="18"/>
                            </StackPanel>
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>
                <TextBlock x:Name="renderDeviceCount" HorizontalAlignment="Left" Margin="220,4,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Width="40"/>
                <TextBlock x:Name="captureDeviceCount" HorizontalAlignment="Left" Margin="560,4,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Width="40" RenderTransformOrigin="0.425,-0.5"/>
                <TextBlock HorizontalAlignment="Left" Margin="350,4,0,0" TextWrapping="Wrap" Text="Capture Devices" VerticalAlignment="Top"/>
                <TextBlock HorizontalAlignment="Left" TextWrapping="Wrap" Text="Render Devices" VerticalAlignment="Top" Margin="10,4,0,0"/>
                <ListBox x:Name="usbList" Margin="10,156,358,16" Width="250" Height="90">
                    <ListBox.ItemTemplate>
                        <DataTemplate x:DataType="device:DeviceInformation">
                            <StackPanel Orientation="Horizontal">
                                <TextBlock Text="{x:Bind Path=Name, Mode=OneWay}" Margin="0,0,0,0" FontSize="18" />
                            </StackPanel>
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>
                <TextBlock HorizontalAlignment="Left" TextWrapping="Wrap" Text="USB Storage" VerticalAlignment="Top" Margin="10,131,0,0"/>
                <TextBlock x:Name="usbDeviceCount" HorizontalAlignment="Left" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Margin="220,131,0,0" Width="40" RenderTransformOrigin="0.575,-0.75"/>

            </Grid>
        </PivotItem>
    </Pivot>

更新于 2017 年 9 月 10 日

Answer 1

因为 xaml 中没有你的代码，我不确定你的数据方式 binding.There 有几个原因导致这个 problem.Please 引用下面的源代码，也许你需要做一些修改可以适合您的 reqiurement.In 添加，您应该在页面的标记中添加 xmlns:device="using:Windows.Devices.Enumeration"。

<Page
x:Class="AudioInSample.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:AudioInSample"
xmlns:device="using:Windows.Devices.Enumeration"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">

<Grid Background="White">
    <StackPanel Margin="10" MinWidth="500">

        <ListBox x:Name="audioCaptureList">
            <ListBox.ItemTemplate>
                <DataTemplate  x:DataType="device:DeviceInformation">
                    <StackPanel>
                        <TextBlock Text="{x:Bind Path=Name, Mode=OneWay}" Margin="12, 15, 12, 0" FontSize="18.667" />
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

        <ListBox x:Name="audioRenderList">
            <ListBox.ItemTemplate>
                <DataTemplate x:DataType="device:DeviceInformation">
                    <StackPanel>
                        <TextBlock Text="{x:Bind Path=Name, Mode=OneWay}" Margin="12, 15, 12, 0" FontSize="18.667" />
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>


    </StackPanel>
</Grid>

Windows IoT Raspberry Pi 3 C# 枚举 USB 音频适配器

Windows IoT Raspberry Pi 3 C# Enumerate USB Audio Adapter

c#

audio

raspberry-pi3

windows-iot-core-10

enumerate-devices