.net core qr code reader

.net core qr code reader

.net core qr code reader

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The final element is simply an empty canvas. This is where your application s user interface will appear. <Canvas x:Name="FrameLayoutRoot" Grid.Row="1"> </Canvas> The most important aspect to the ErrorFrame is a method used to set the exception: public void setException(Exception ex) { exceptionTB.Text = "An unhandled exception has occurred.\n\nMessage: " + ex.Message + "\n\nStack trace:\n" + ex.StackTrace; errorBar.Visibility = Visibility.Visible; } Inside the App.xaml.cs file, the ErrorFrame becomes the root container, instead of the XAML_Viewer, which has been the root throughout this book. The ErrorFrame instance is stored so the unhandled exception handler can communicate the exception to the ErrorFrame. private ErrorFrame errorFrame; private void Application_Startup(object sender, StartupEventArgs e) { XAML_Viewer viewer = new XAML_Viewer(); viewer.addXamlPage("Generate Exception", new CreateException()); errorFrame = new ErrorFrame(); errorFrame.setLayoutRoot(viewer); this.RootVisual = errorFrame; } The rest is as simple as invoking the setException method of the ErrorFrame class in the unhandled exception handler. errorFrame.setException(e.ExceptionObject); Now any time your application encounters an exception it can t recover from (otherwise you d be handling the exception), the user will get immediate feedback and can optionally choose to report the error (if you don t do this automatically or remove this button in case of the automatic notification to the server).

Notice that Listing 3-9 reduces the amount of code and increases the readability of the earlier template example by replacing the User class definition with Expando, which contains the firstName and lastName properties.

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Another important concept to Groovy and Grails is Meta Object Protocol (MOP). This protocol enables you to add properties and behaviors to existing classes, much like the Expando class discussed in the previous section. The capability of MOP to extend classes doesn t just exist for classes you write or Groovy classes. MOP enables you to add functionality to the Java API, including classes such as java.lang.String, which is marked as final to prevent standard Java classes from extending it and adding functionality. This is how the Groovy JDK10 provides more Groovy idiomatic behavior to the standard Java classes. You will learn in 6 how Grails uses this technique to add amazing persistence features to your domain classes.

Summary

The shell is the primary means of communication with the computer. Much can be done with a graphical interface, but many things are difficult or even impossible. Many more tasks are much slower to perform by point-and-click. Shell scripts, on the other hand, use the language that you use to talk to the computer; the same commands you type at the command prompt can be put into a file and used as a script. Shell scripts fall into three basic categories: automation, encapsulation, and computation. Automation scripts are for oft-repeated series of commands. Encapsulation scripts are for storing complex commands under a simple name. Computation scripts are for deriving information from data. The three are not mutually exclusive; indeed, all are forms of automation. In its simplest form, automation is a series of simple commands For example, this script prints some information about the current directory:

10. http://groovy.codehaus.org/groovy-jdk/

Testing and debugging are vital activities to develop software effectively. When combined, testing and debugging help form proactive and reactive strategies to reduce the number of defects in software. In this chapter you learned how to leverage the unit testing framework libraries and the test harness that you can obtain from Microsoft in order to construct and execute unit tests for Silverlight applications. You also briefly saw how user interface automation is used to interact with Silverlight, and the attached properties you can use to instrument

Note An in-depth explanation of the entire MOP and dispatch mechanism is beyond the scope of a book

set -- * files=$# set -- */ dirs=$# echo "Number of files in $PWD: $files (including $dirs directories)" I can put those lines in a file (e.g., $HOME/bin/ff) and turn on execute permissions (chmod +x $HOME/bin/ff). If I execute that script (ff) in the main directory for this book, it produces this output: Number of files in /home/chris/Documents: 156 (including 34 directories) Encapsulation scripts store an obscure, long, or complex command in an easy-toremember name. For instance, I regularly copy a file from my home computer to my web page. For a long time I had to look up the location on my home computer and the destination address every time (Which one had the directory name capitalized ). I finally got smart and put it in a script called ttcp: eval "`date "+DATE=%Y-%m-%d"`" src=$HOME/work/Tuesday-Tips/$DATE.html dest=cfaj@freeshell.org:html/shell/tuesday-tips/ [ -f "$src" ] && scp -p "$src" "$dest" My phone number look-up command, ph, is a very simple computational script that takes a name supplied on the command line and searches for it in a file: egrep -ih "$*" $HOME/.phones Shell scripts range from simple one-liners to complex applications, and they are easily adaptable to different situations. You may very likely find scripts in this book that almost do what you want, and you can modify them to fit the bill exactly.

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