winforms qr code reader

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In the property implementation, you use the COMIndexedPropertyToList() static method on the COMHelpers class In COMIndexedPropertyToList() you enumerate a COM indexed property and return an CLR List instance populated with the same items The DeviceManager COM object also implements a RegisterEvent and an UnregisterEvent method that allows for callers to register and unregister for specific events defined in the WIA automation API as GUIDs You define a RegisterEvents() wrapper method on WIADeviceManager that accepts a collection of event GUID s and registers each of them Similarly, WIADeviceManagerUnregisterEvents() unregisters an already registered set of events The first parameter to the RegisterEvent() and UnregisterEvent() methods are DeviceID s for the device in whose events you may be interested You can pass the string * if you are interested in a specific event for all connected devices at the moment The DeviceManager object also raises a COM event named OnEvent.

FCKConfig.ToolbarSets["seller"] = [['Bold','Italic','Underline','StrikeThrough','-','TextColor', 'BGColor']] ;

You attach a handler to OnEvent in the WIADeviceManager constructor, and raise your own OnEvent implementation, passing in a new instance of WIAEventArgs type populated with the individual parameters obtained from the COM OnEvent handler There are several more WIA automation types that you have wrapped around in your wrapper object model, but we do not list all of them here for brevity The purpose of this section was to show you a sample of COM Interop code, and the rest of the wrapper object model follows the exact same principles and techniques shown so far For the rest of the recipe, whenever you encounter a type with a name starting with the string WIA , know that it is one of your wrapper types defined in wiaomcs wrapping around a corresponding automation type..

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Figure 8-12. The client application user interface On the left is a list of devices connected to the computer that WIA recognizes. The right side shows the photo viewer with a pager control at the bottom to navigate through the photos on a connected camera, plus as a button that allows the user to save a specific photo to the disk. To test the application s functionality, you will need a digital camera with some images already stored in it. Run the application with the camera connected, or connect it to your PC with the application running. Then select the camera device; the right hand pane should let you navigate through the images on the camera as well as save them to your computer s local file system Note that Figure 8-12 shows both a scanner and a camera connected to the computer. Recall from the earlier section that WIA recognizes scanners as source devices for digital images as well. In this sample, however, you will only deal with digital camera-specific features. Listing 8-11 shows relevant portions of the code for the MainPage.xaml from the application. Listing 8-11. Portions of MainPage.xaml <Grid x:Name="LayoutRoot" Background="Black"> <Grid.ColumnDefinitions> <ColumnDefinition Width="0.294*"/> <ColumnDefinition Width="0.706*"/> </Grid.ColumnDefinitions> <Border BorderBrush="White" BorderThickness="1" Margin="2"> <ListBox Margin="0" x:Name="lbxDevices" ItemContainerStyle="{StaticResource styleImagingDeviceListBoxItem}" SelectionChanged="lbxDevices_SelectionChanged" Background="Black"/> </Border> <Border BorderBrush="White" BorderThickness="1" Margin="2" Grid.Column="1">

<ContentControl x:Name="cntctlDataPane" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch" Margin="0" /> </Border> </Grid> The ListBox named lbxDevices implements the device list shown in Figure 8-12 The ContentControl cntctldataPane is used to display the photos; we will discuss the mechanics of that later in the recipe. Listing 8-12 shows the codebehind for MainPage.xaml. Listing 8-12. Codebehind for MainPage.xaml public partial class MainPage : UserControl { //event handler delegate to handle the WIADeviceManager.OnEvent event public delegate void WIADeviceManageOnEventHandler(string EventID, string DeviceID, string ItemID); //WIADeviceManager singleton WIADeviceManager wiaDeviceManager = null; //the collection of all connected devices ObservableCollection<WIADevice> WIADevicesColl = new ObservableCollection<WIADevice>(); public MainPage() { InitializeComponent(); //create the DeviceManager wiaDeviceManager = WIADeviceManager.Create(); //register for connection and disconnection events for all devices //that WIA might recognize wiaDeviceManager.RegisterEvents("*", new string[]{WIAEventID.DeviceConnected,WIAEventID.DeviceDisconnected}); //attach event handler for OnEvent wiaDeviceManager.OnEvent += new EventHandler<WIAOnEventArgs>(wiaDeviceManager_OnEvent); //get and connect all the devices WIADevicesColl = new ObservableCollection<WIADevice>( wiaDeviceManager.DeviceInfos.Select((di) => di.Connect())); //set the device list lbxDevices.ItemsSource = WIADevicesColl; } void wiaDeviceManager_OnEvent(object sender, WIAOnEventArgs e) { //if a device just connected

crucial even for those meetings where you sit around discussing how to do something best: brilliant programmers who have trouble explaining their ideas just can t make as much of a contribution. In this particular category, we also consider the neatness and orderliness of their resume. A disorganized resume rife with grammatical errors where nothing lines up is a pretty big red flag for a disorganized thinker or just general sloppiness; for many jobs this can be fine, but not for software development. In particular, we usually completely disqualify resumes that are full of English mistakes. It s not that hard, even for a nonnative speaker, to find someone to check your resume, and failure to do that usually reflects a profound lack of concern over the quality of the things that you do. That said, we try to be considerate of nonnative speakers who are nonetheless excellent communicators: leaving out articles in charming Eastern European way, or starting every paragraph with So in the charming Pacific Northwestian way, is not a showstopper.

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