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Listing 5-12. Using StreamWriter StreamWriter^ sw = gcnew StreamWriter("textfile.txt"); sw->WriteLine("Can code be poetry "); sw->Flush(); sw->Close(); // The File class's CreateText static method is used to // create a text file. StreamWriter^ sw2 = File::CreateText("newtextfile.txt"); To read text, use the StreamReader class (see Listing 5-13). Listing 5-13. Using StreamReader StreamReader^ sr = gcnew StreamReader("textfile.txt"); String^ line; // Read each line and write it out to the console. while ((line = sr->ReadLine()) != nullptr) { Console::WriteLine(line); } Whenever you deal with files, of course, you cannot neglect proper error handling. The .NET Framework classes throw exceptions of type System::IO::IOException to indicate error conditions, so you would normally use a try/catch block around any attempt to work with a file. This code is a typical example: the exception has a Message property that contains an informative error message, as in Listing 5-14. Listing 5-14. Using an Exception s Message Property String^ filename = "textfile.txt"; try { // Another way of creating a StreamReader class is with // static methods of the File class. StreamReader^ sr2 = File::OpenText(filename); String^ line; // Read each line and write it out to the console. while ((line = sr2->ReadLine()) != nullptr) { Console::WriteLine(line); } } catch(IOException^ e) { Console::WriteLine("Exception! {0}", e->Message ); }

This MyIPAddress widget is a very simple example of creating a new widget. For use in an actual application, it would have to be expanded greatly. For example, you would want to customize the pop-up menu that is displayed when the user right-clicks the widget. Another enhancement would be to allow the programmer to define custom IP address formats. You may want to try expanding the MyIPAddress widget before continuing on to the next section so that you can better understand what was covered in this section.

I ve only scratched the surface here, to give you some of the simplest examples. Refer to the documentation for the .NET Framework for all the methods of the File, StreamWriter, StreamReader, and related classes to learn more.

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Now that you have learned how to derive a new widget from one that already exists, it is time to learn how to create a widget from scratch. You will notice that a lot of the code in this section is similar to that in the previous. This is because new widgets are implemented in the same way as those that are derived, since they both have a base type of GObject; it just takes a little more work. In this section, you will learn how to implement a widget called MyMarquee. This widget scrolls a message from the right side of the widget to the left side, over and over. Make sure you understand this widget, because it will be your job to extend it in this chapter s exercise. You can view a screenshot of the MyMarquee widget in Figure 11-2. As with all of the examples in this book, you can download the full source code for this example on the book s web site.

You use the NUnit framework to run tests in an organized manner. NUnit is so simple and straightforward that it s tempting to believe that NUnit is missing something. However, NUnit is complete, and when used in conjunction with logging and proper exceptions, tells you what s working and not working. Remember, when using NUnit and TDD you don t need to test each method individually. TDD is about testing scenarios and defining what all the possible scenarios are. For reference purposes, scenarios that fail are just as important as scenarios that succeed. As much as we d like to have shortcuts to develop test scripts using auto-generated code, this neither works nor helps the test. Auto-generated code is good if you re testing mathematical algorithms or programming languages. Auto-generated code generates a large list of numbers that you can use as a check mark to indicate success or failure. These numbers make it sound good that an application passes x thousand tests. I d rather have three well-defined scenario tests than a hundred auto-generated tests. There s no best way to write tests. Essentially, tests need to provide coverage and be realistic. The best way to start writing tests is to choose a problem that the assembly or application attempts to solve. From there, determine the overall operation, define the correct parameters, and then test the generated outputs when the operation has been called.

The first step in setting up a new widget is to create the header file. This allows you to define the programmatic interface that will be used to control the widget. Listing 11-7 gives the full header file for the MyMarquee widget, which should appear very similar to the MyIPAddress header file. Listing 11-17. MyMarquee Widget Header (mymarquee.h) #ifndef __MY_MARQUEE_H__ #define __MY_MARQUEE_H__ #include <glib.h> #include <gdk/gdk.h> #include <gtk/gtkwidget.h>

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