winforms ean 13 reader

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You check to see if there is an ongoing capture, and if so, stop it. You then create a new CaptureSource instance and initialize the VideoCaptureSource and the AudioCaptureSource property with the currently selected devices in the user interface or the respective default devices in those categories if no selections are currently made. You then check to see if access has been granted in this application session already, and if not, request access to use the capture devices. Once the user opts in, you start the capture calling CaptureSource.Start(). To display the captured video, you create a VideoBrush, with its source set to the CaptureSource, and use the VideoBrush as the Background property of a Border element in the user interface. Finally, you attach a handler to the CaptureImageCompleted event on the CaptureSource to handle still image capture and store each WriteableBitmap in a collection that was previously bound to an ItemsControl. Listing 10-36 shows the code to capture a still image. Listing 10-36. Capture a still image private void btnSnapPic_Click(object sender, RoutedEventArgs e) { //capture a still image currentCaptureSource.CaptureImageAsync(); } Listing 10-37 shows the code to display the supported video formats for the selected video capture device. Listing 10-37. Listing supported video formats private void btnVideoDeviceProperties_Click(object sender, RoutedEventArgs e) { //use either the selected video capture device or the default one if none //is selected VideoCaptureDevice Device = cbxVideoDevices.SelectedItem == null CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice() : cbxVideoDevices.SelectedItem as VideoCaptureDevice; //create a child window with a title ChildWindow cwDeviceProperties = new ChildWindow() { Title = string.Format("Properties - {0}", Device.FriendlyName) , Height=300, Width=400 }; //set the child window content to a content control //bind the content control to the list of supported formats //set the content template to the data template for displaying //video formats cwDeviceProperties.Content = new ContentControl() { Content = Device.SupportedFormats,

ContentTemplate = this.Resources["dtVideoDeviceProperty"] as DataTemplate }; //show the child window cwDeviceProperties.Show(); } You start by picking either the selected video capture device or the default one. You then create a ChildWindow instance with its Title property set to displaying the FriendlyName for the device. You set the content of the ChildWindow instance to a ContentControl instance, with the ContentControl.Content set to the collection of supported video formats by the device. You also set the ContentControl.ContentTemplate to a DataTemplate used to display the supported formats, and then show the ChildWindow instance. Listing 10-38 shows the DataTemplate used to display the supported video format collection. Listing 10-38. DataTemplate to display the collection of supported video formats <DataTemplate x:Key="dtVideoDeviceProperty"> <DataControls:DataGrid AutoGenerateColumns="True" ItemsSource="{Binding}" HorizontalAlignment="Stretch"/> </DataTemplate> You simply use a DataGrid with auto generated columns to bind to the collection of VideoFormat objects. Figure 10-29 shows the video formats listed.

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The StatusEllipse_MouseLeftButtonDown event checks to see if the background worker thread is actually running and then sets PromptCancelCanvas.Visibility to Visibility.Visible. That displays the dialog that simply consists of a large rectangle with a transparent look and a rounded white rectangle with the two buttons. Clicking Yes fires the ButtonConfirmCancelYes_Click event handler that calls the worker.CancelAsync method. That completes the walkthrough of the code. Most of the other UI code is generated using Expression Blend, which is covered in 3. We recommend playing with the UI a bit to understand what it does and then reviewing the corresponding code. Listings 2-13 and 2-14 list the code for this recipe s test application. We don t show the keyframe animation in the AnimateStatusEllipse to make Listing 2-14 easier to navigate.

<UserControl x:Class="Ch02_ProgrammingModel.Recipe2_7.MainPage xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"> <UserControl.Resources> <Storyboard x:Name="AnimateStatusEllipse"> . </Storyboard> </UserControl.Resources> <Grid x:Name="LayoutRoot" Background="#FFFFFFFF"> <Grid.ColumnDefinitions> <ColumnDefinition Width="0.068*"/> <ColumnDefinition Width="0.438*"/> <ColumnDefinition Width="0.495*"/> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="0.08*"/> <RowDefinition Height="0.217*"/> <RowDefinition Height="0.61*"/> <RowDefinition Height="0.093*"/> </Grid.RowDefinitions> <Button HorizontalAlignment="Stretch" Margin="5,8,5,8" VerticalAlignment="Stretch" Grid.Column="1" Grid.Row="1" Content="Save Form Data" Click="SaveFormData_Click"/> <StackPanel HorizontalAlignment="Stretch" Margin="5,8,6,8" Grid.Column="1" Grid.Row="2"> <TextBlock Height="Auto" Width="Auto" Text="Work Results Appear Below" TextWrapping="Wrap" Margin="4,4,4,4"/> <TextBox Height="103" Width="Auto" Text="" TextWrapping="Wrap" Margin="4,4,4,4" x:Name="WorkResultsTextData"/>

The zscript element, shown in Listing 4-9, is a special ZUML element to define Java code to be evaluated when a ZUML page is rendered. It is most often used to initialize page or component creation or to declare global functions.

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