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In this example, when the Notfound action is invoked, the HTTP status code is set to 404 and we render a custom view. The example in listing 16.8 is a true catchall route that will literally match any URL that hasn t been caught by the higher-priority rules. It s valid to have other catchall parameters used in regular routes, such as /events/{*info}, which would catch every URL starting with /events/. But be cautious using these catchall parameters, because they ll include any other text on the URL, including slashes and period characters (which are usually reserved as separators for route segments). It s a good idea to use a regular expression parameter wherever possible so you remain in control of the data being passed into your controller action, rather than just grabbing everything. Another interesting use for a catchall route is for dynamic hierarchies, such as product categories. When you reach the limits of the routing system, you can create a catchall route and do it yourself.

need to directly interface with it at this point, because GtkFileChooserButton will handle all interactions with the dialog.

Consider a scenario in which Alice is a bank customer who wants to communicate with her bank s customer service representative, Bob, over a computer network. Alice may first need to authenticate herself to Bob by sending her account number and PIN. If Alice sends her account number and PIN to Bob in the clear (without any encryption), then an eavesdropper, Eve, may be able to intercept Alice s credentials and impersonate Alice. We can use an encryption algorithm to protect the confidentiality of data exchanged between Alice and Bob. When Alice encrypts data, the message that she sends to Bob will look like garbage to everybody else but Bob. Bob can use a decryption algorithm to decode the message.

If you re using Internet Explorer to develop and browse your application, be careful that you aren t seeing Internet Explorer s friendly error messages when developing these custom 404 errors, because IE will replace your custom page with its own. To avoid this, select Tools > Internet Options and deselect the Show Friendly HTTP Error Messages option under the Browsing options on the Advanced tab. Your custom 404 page should appear. Don t forget, though, that users of your application using IE may not see your custom error pages.

You are able to change basic settings such as the currently selected file, the current folder, and the title of the file selection window. Listing 4-10 shows you how to use both types of file chooser buttons.

At this point, the default {controller}/{action}/{id} route can be removed because we ve completely customized the routes to match our URL schema. Or you might choose to keep it around to serve as a default way to access your other controllers.

We first describe a strawman encryption algorithm called a substitution cipher. We use this example only to concretely demonstrate what an encryption algorithm is and how it works, and also introduce some terminology and provide some intuition as to why it is hard to come up with a good encryption algorithm.

Listing 4-10. Using the File Chooser Button (filechooserbuttons.c) #include <gtk/gtk.h> static void folder_changed (GtkFileChooser*, GtkFileChooser*); static void file_changed (GtkFileChooser*, GtkLabel*); int main (int argc, char *argv[]) { GtkWidget *window, *chooser1, *chooser2, label, *vbox; GtkFileFilter *filter; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "File Chooser Button"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); label = gtk_label_new (""); /* Create two buttons, one to select a folder and one to select a file. */ chooser1 = gtk_file_chooser_button_new ("Chooser a Folder", GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER); chooser2 = gtk_file_chooser_button_new ("Chooser a Folder", GTK_FILE_CHOOSER_ACTION_OPEN); /* Monitor when the selected folder or file are changed. */ g_signal_connect (G_OBJECT (chooser1), "selection_changed", G_CALLBACK (folder_changed), (gpointer) chooser2); g_signal_connect (G_OBJECT (chooser2), "selection_changed", G_CALLBACK (file_changed), (gpointer) label); /* Set both file chooser buttons to the location of the user's home directory. */ gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (chooser1), g_get_home_dir()); gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (chooser2), g_get_home_dir());

We ve now customized the URL schema for our website. We ve done this with complete control over our URLs, and without modifying where we keep our controllers and actions. This means that any ASP.NET MVC developer can come and look at our application and know exactly where everything is. This is a powerful concept. Next, we ll discover how to use the routing system from within our application.

/* Provide a filter to show all files and one to show only 3 types of images. */ filter1 = gtk_file_filter_new (); filter2 = gtk_file_filter_new (); gtk_file_filter_set_name (filter1, "Image Files"); gtk_file_filter_set_name (filter2, "All Files"); gtk_file_filter_add_pattern (filter1, "*.png"); gtk_file_filter_add_pattern (filter1, "*.jpg"); gtk_file_filter_add_pattern (filter1, "*.gif"); gtk_file_filter_add_pattern (filter2, "*"); /* Add both the filters to the file chooser button that selects files. */ gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (chooser2), filter1); gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (chooser2), filter2); vbox = gtk_vbox_new (FALSE, gtk_box_pack_start_defaults gtk_box_pack_start_defaults gtk_box_pack_start_defaults 5); (GTK_BOX (vbox), chooser1); (GTK_BOX (vbox), chooser2); (GTK_BOX (vbox), label);