public partial class YIDong : Page{public YIDong(){InitializeComponent();cb.ItemsSource = MultimediaUtil.VideoInputNames;//获得所有摄像头if (MultimediaUtil.VideoInputNames.Length > 0){cb.SelectedIndex = 0;//第0个摄像头为默认摄像头
            }else{MessageBox.Show("电脑没有安装任何可用摄像头");}cameraTimer.IsEnabled = false;cameraTimer.Interval = new TimeSpan(200); //执行间隔0.2秒cameraTimer.Tick += cameraTimer_Tick; ;}/// <summary>/// ZXING 二维码扫描类/// </summary>BarcodeReader codeReader = new BarcodeReader();/// <summary>/// 定时器/// </summary>DispatcherTimer cameraTimer = new DispatcherTimer();private void cameraTimer_Tick(object sender, EventArgs e){RenderTargetBitmap bmp = new RenderTargetBitmap((int)vce.ActualWidth, (int)vce.ActualHeight, 96, 96, PixelFormats.Default);vce.Measure(vce.RenderSize);vce.Arrange(new Rect(vce.RenderSize));bmp.Render(vce);BitmapEncoder encoder = new JpegBitmapEncoder();encoder.Frames.Add(BitmapFrame.Create(bmp));using (MemoryStream ms = new MemoryStream()){encoder.Save(ms);Bitmap btiMap = new Bitmap(ms);var result = codeReader.Decode(btiMap);//解析条码if (result != null){string shelve_index = result.ToString();ObservableCollection<XModel.STORe_DetailVm> list = XDAL.STORE_goods_Detail.GetGoodsByShelve_Index(shelve_index);Dialog.OpenWindow open = Lib.pubMethod.GetOpenWindow(this);if (open != null){Application.Current.Properties["SweepList"] = list;open.CloseAsTrue();}}}}private void btnCapture_Click(object sender, RoutedEventArgs e){cameraTimer.Start();}private void Restart_Click(object sender, RoutedEventArgs e){cameraTimer.Stop();vce.Play();}private void cb_SelectionChanged(object sender, SelectionChangedEventArgs e){//控件制定摄像头vce.VideoCaptureSource = (string)cb.SelectedItem;}

 <Grid><Grid.ColumnDefinitions><ColumnDefinition Width="86*"/><ColumnDefinition Width="237*"/></Grid.ColumnDefinitions><Grid.RowDefinitions><RowDefinition Height="5*"/><RowDefinition Height="*"/><RowDefinition Height="*"/></Grid.RowDefinitions><StackPanel Background="LightBlue" Grid.Row="0" Grid.ColumnSpan="2"><wpfmedia:VideoCaptureElement x:Name="vce" Stretch="Fill" Width="auto" Height="auto" Margin="0" Grid.Row="0" RenderTransformOrigin="0.5,0.5"><wpfmedia:VideoCaptureElement.RenderTransform><TransformGroup><ScaleTransform/><SkewTransform/><TranslateTransform/></TransformGroup></wpfmedia:VideoCaptureElement.RenderTransform></wpfmedia:VideoCaptureElement></StackPanel><Label x:Name="label" Content="摄像头：" Grid.Row="1" Grid.Column="0"  Width="49" HorizontalAlignment="Right" Margin="0,14,0,4" /><ComboBox x:Name="cb" Style="{StaticResource Query_Combo}" Grid.Row="1" Width="204" HorizontalAlignment="Left" Margin="2,13,0,8" SelectionChanged="cb_SelectionChanged" Grid.Column="1"  /><Button  Content="开始" x:Name="btnCapture" Style="{StaticResource Query_Button}" Click="btnCapture_Click"  Width="50" Grid.Row="2" Grid.Column="1" Height="20" HorizontalAlignment="Left" Margin="9,10,0,14"/><Button  Content="暂停" x:Name="btnReStart" Style="{StaticResource Query_Button}" Click="Restart_Click" Width="50" Grid.Row="2" Grid.Column="1" Height="20" HorizontalAlignment="Left" Margin="67,11,0,15"/></Grid>