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Exercise 6-1 is straightforward. You need to create a normal GTK+ application as always. In the main window, the entry, file chooser button, and Save button should be added and packed by a GtkVBox. The exercise solution can be found in Appendix F. When the button is pressed, you need to save the text in the entry to a file. That file should be created in the specified location under whatever name you choose. Then, you need to use the GError structure to make sure the file was successfully created.

(continued)

Most tools and techniques that security designers have invented generally attempt to do the following: Prevent security concerns from ever becoming a problem by designing the system to make it theoretically or practically impossible for the problem to occur Detect the problem such that administrators, users, or other software can be made aware of the problem Contain the problem once it occurs such that the system can continue to function correctly even in light of the problem Recover from damage that has been caused by the problem after the problem has occurred Table A-1 shows several tools and techniques that can be used to prevent, detect, contain, and recover from failure, lies, and infiltration. Table A-1. The FLI Framework

For this exercise, create a window that contains a GtkLabel and a button. The label should initially display the number 0 . The timeout function should be called every second, incrementing the label up one digit. When the button is pressed, the counter should be reset and begin counting again. As stated before, you should never use timeouts to count time if you need accuracy. Therefore, you should reimplement this example using timers. Consider placing two labels in the window, one using a timeout function for counting and one using a timer. What can you conclude from this example

Overall, it s best to favor code-generation techniques where you never version or maintain the generated code. In this way, you can modify the templates and regenerate code at build time. Some code generators actually work at runtime, generating code right before executing it.

Exercise 6-2 is a little more difficult than the previous one, because you need to figure out how to get both the GtkLabel and the current count to the timeout function. Of course, you could use a global variable, but this is not the preferred method in most cases. In the solution in Appendix F, both elements were stored in a structure that could easily be passed to the timeout function. This is the method that you should use in most of your applications, because it will make them easier to manage when they grow in size. The purpose of the application was to count the number of seconds that have gone by using a timeout function. Whenever the Clear button is clicked, the count should be reset to 0 seconds for each button. Both of these exercises are meant to stimulate your imagination. You have learned a great deal in this chapter as well as previous chapters. You should experiment with integrating your previous knowledge of GTK+ with the topics in this chapter.

Authentication Access control Non-repudiation Timestamping Digital signatures Fail-stop digital signatures

T4 templates can be a little intimidating, but you can do a lot with them. If you re interested in customizing the templates, download Visual T4 Editor for Visual Studio 2008 Community Edition free from Clarius Consulting (www.visualt4.com/downloads.html). This will give you syntax highlighting, which is helpful when you find yourself writing code that writes code! To learn more about T4 template syntax and the ASP.NET MVC integration, check out T4 Templates: A Quick-Start Guide for ASP.NET MVC Developers on the Visual Web Developer Team Blog (http://mng.bz/g65j).

Every programming book I have read in my lifetime has begun with a Hello World example application. I do not want to be the one to break with tradition. Before we get to the example, you should know that all of the source code for every example is downloadable from this book s web site, found at www.gtkbook.com. You can compile each example with the method presented in a later section of this chapter or follow the instructions found in the base folder of the package. Listing 2-1 is the first and most simple GTK+ application in this book. It initializes GTK+, creates a window, displays it to the user, and waits for the program to be terminated. It is very basic, but it shows the essential code that every GTK+ application you create must have!