winforms pdf 417 reader

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The local installation deployment model also adds support for application-initiated self-updates for application code. The related API lets you check for updates to the application code at the site of origin and asynchronously download the changes. The Application.CheckAndDownloadUpdateAsync() method checks for any updates to the application code at the site of origin. If it finds an updated version, the updated bits are downloaded to the local machine s application cache asynchronously. The Application.CheckAndDownloadUpdateCompleted event is raised when the download process completes or if the check reveals no changes. The CheckAndDownloadUpdatedCompletedEventArgs.UpdateAvailable property is set to true if updates were downloaded or false if no updates were available. To apply the updates, the user needs to restart the application. Listing 8-3 shows a possible use of the application-update feature. Listing 8-3. Code to Update an Application with Changes private void Application_Startup(object sender, StartupEventArgs e) { if(Application.Current.InstallState == InstallState.Installed && Application.Current.IsRunningOutOfBrowser &&

NetworkInterface.GetIsNetworkAvailable()) { Application.Current.CheckAndDownloadUpdateCompleted+= new CheckAndDownloadUpdateCompletedEventHandler((s,args)=> { if (args.UpdateAvailable) { MessageBox.Show("New updates are available for this application." + "Please restart the application to apply updates.","Update Status", MessageBoxButton.OK); this.RootVisual = new CheckUpdatePage(); } else this.RootVisual = new MainPage(); }); Application.Current.CheckAndDownloadUpdateAsync(); } else this.RootVisual = new MainPage(); } As shown in Listing 8-3, you check to see if the application is running from a locally installed version out of the browser and has network connectivity. If so, you proceed to invoke CheckAndDownloadUpdatesAsync(). In the CheckAndDownloadUpdateCompleted handler, you check to see if updates are available. If there are updates, you display an appropriate message and use a different root visual to prevent the main application from running without the updates being applied. Note that whether you want to enforce the download of an available update depends on application logic specified as shown in Listing 8-3. Should you choose to, you can let the user continue without applying the update, as long as your application can function as an older version without causing any errors.

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The code sample for this recipe builds a simple note-taking application that allows the user to take notes that have a title and a body and stores them on the server categorized by the date the note was taken. The application can also be installed locally; the user can operate the locally installed application even when disconnected from the network by providing a local note store. The user can then synchronize the local note store with the server when network connectivity is restored. Figure 8-7 shows the application two ways, running in-browser and locally installed.

Note A separator is used to insert a space between two components. A space is a variant of separator whose default orientation is vertical. The hbox component is used to create a horizontally oriented box. Each component placed in the hbox will be placed horizontally in a row.

The synchronization illustrated in Figure 1-12 occurs either manually by sharing folders or via source-code integration available in both Visual Studio and in Expression Blend 4. With Expression Blend 2, designers had to use the stand-alone Team Foundation Server client to check files in and out of source code control. Now with Expression Blend 3 or later, designers are even more integrated into the design/development process. A point to emphasize is that, unlike with other technologies, the output from the rich design tool, XAML, is what actually is compiled into the application. For comparison purposes, in Windows Forms development, a designer cannot create a rich, highly visual control in the technology used by the developer directly. Instead, the designer might use a drawing tool such as Adobe Photoshop or Microsoft PowerPoint to create a mock-up. The developer starts from scratch using separate tools and technology and attempts to create a custom control that renders like the mock-up. This creates a developer/designer disconnect, or lag, between design changes and coding implementation because the designer and developer work in separate toolsets. XAML technology enables you to use a wide range of tools since it is well-formed XML. The fact that XAML can be compiled directly permits the developer to take the output from the design team and directly utilize it in the application, completely removing the lag between the designer and the developer.

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