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The first instance, pkg-config --cflags gtk+-2.0, returns directory names to the compiler s include path. This will make sure that the GTK+ header files are available to the compiler. Try running pkg-config --cflags gtk+-2.0 in your terminal to see an example of what is being output to the compiler. The second call, pkg-config --libs gtk+-2.0, appends options to the command line used by the linker including library directory path extensions and a list of libraries needed for linking to the executable. The libraries that are returned in a standard Linux environment follow: GTK+ (-lgtk): Graphical widgets GDK (-lgdk): The standard graphics rendering library GdkPixbuf (-lgdk_pixbuf): Client-side image manipulation Pango (-lpango): Font rendering and output GObject (-lgobject): Object-oriented type system GModule (-lgmodule): Dynamically loading libraries GLib (-lglib): Data types and utility functions Xlib (-lX11): X Window System protocol library Xext (-lXext): X extensions library routines GNU math library (-lm): The GNU library from which GTK+ uses many routines As you can see, pkg-config provides a convenient way for you to avoid hard-coding a long list of includes and libraries manually every time you compile a GTK+ application. Listing 2-1 is one of the simplest applications that you can create with GTK+. It produces a top-level GtkWindow widget with a default width and height of 200 pixels, as displayed in Figure 2-2.

Guid entityId; try { entityId = new Guid(value.AttemptedValue); } catch (FormatException) { return null; }

Figure 2-2. The Hello World window at the default size Even though the window includes the standard X on the right side of the title bar, you ll notice that clicking that X will only cause the window to disappear. The application continues to wait for events, and control will not be returned to the launching terminal until you press Ctrl+C. You will learn how to implement a shutdown callback with signals in the next example.

With these changes, our test now passes. We surrounded our original GUID constructor with a try..catch block for the specific FormatException type thrown when the parsed value isn t of the right format B. There are other interesting scenarios we could add tests for, but all of them employ the same technique of creating a ModelBindingContext representative of a certain model-binding scenario. Unit tests for model binders go a long way to proving the design of a model binder, but they still don t guarantee a working application.

National Computer Security Center 1996 Auditing issues in secure database management systems National Computer Security Center Technical Report 005, vol 4/5, May Nechvatal, James 1996 A public-key-based key escrow system Journal of Systems and Software 35 (1): 73 83 Ng, Sam 2006 Advanced topics in SQL injection protection, wwwowasporg/images/7/7d/ Advanced_Topics_on_SQL_Injection_Protectionppt Oppliger, Rolf 1997 Internet security: Firewalls and beyond Communications of the ACM 40 (5): 92 102 Paul, Souradyuti, and Bart Preneel 2004 A new weakness in the RC4 keystream generator and an approach to improve the security of the cipher In Fast Software Encryption: 11th International Workshop, FSE 2004, Delhi, India, February 2004, revised papers (LNCS 3017), 245 259 Berlin: Springer-Verlag Perlman, Radia 1998 Network layer protocols with Byzantine robustness PhD thesis, Department of Electrical Engineering and Computer Science, MIT Picciotto, Jeffery 1987 The design of an effective auditing subsystem.

Up to this point, you have only learned about one type of cell renderer, GtkCellRendererText. This renderer allows you to display strings, numbers, and Boolean values as text. You are able to customize how the text is displayed with cell renderer attributes and cell data functions and allow it to be edited by the user. GTK+ provides a large number of cell renderers that can display other types of widgets besides text. These are toggle buttons, images, spin buttons, combo boxes, progress bars, and accelerators, which will all be covered in this section.

Guid.TryParse and Enum.TryParse<T> have both been added to .NET 4. Up through .NET 3.5 SP1, there was no built-in way to see if a string was a valid GUID, although you can find plenty of regular-expression solutions on the web. If you d like to look into this issue yourself, please browse the original Microsoft Connect issue and workarounds logged since 2004 at http://mng.bz/VuSa.