1

我打算将 2 个或更多 USB 音频适配器（每个都有麦克风和线路）连接到我的树莓派 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上。我不明白这是怎么回事。我尝试使用下面的代码，发生异常处理程序。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.. 它可以工作.. 但似乎我无法正确安排堆栈面板边距。 从我的 XAML 布局 实际显示的对齐不正确

我在下面有我的代码。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>

2017 年 9 月 10 日更新

我不明白我的利润太大了。 它基于我想要的尺寸

4

1 回答 1

1

因为没有您在 xaml 中的代码，我不确定您的数据绑定方式。导致此问题的原因有多种。请参考下面的源代码，也许您需要进行一些修改以适合您的要求。此外，您应该添加xmlns :device="using:Windows.Devices.Enumeration"在页面的标签中。

<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>

于 2017-10-06T02:17:26.797 回答