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g_signal_connect (G_OBJECT (toggle1), "toggled", G_CALLBACK (button_toggled), (gpointer) toggle2); g_signal_connect (G_OBJECT (toggle2), "toggled", G_CALLBACK (button_toggled), (gpointer) toggle1); gtk_box_pack_start_defaults (GTK_BOX (vbox), toggle1); gtk_box_pack_start_defaults (GTK_BOX (vbox), toggle2); gtk_container_add (GTK_CONTAINER (window), vbox); gtk_widget_show_all (window); gtk_main (); return 0; } /* If the toggle button was activated, set the other as disabled. Otherwise, * enable the other toggle button. */ static void button_toggled (GtkToggleButton *toggle, GtkWidget *other_toggle) { if (gtk_toggle_button_get_active (toggle)) gtk_widget_set_sensitive (other_toggle, FALSE); else gtk_widget_set_sensitive (other_toggle, TRUE); } The only signal added by the GtkToggleButton class is toggled, which is emitted when the user activates or deactivates the button. This signal was triggered in Listing 4-2 by one toggle button in order to disable the other. In Listing 4-2, another important piece of information was shown: multiple widgets can use the same callback function. We did not need to create a separate callback function for each toggle button, since each required the same functionality. It is also possible to connect one signal to multiple callback functions, although this is not recommended. Instead, you should just implement the whole functionality in a single callback function.

If you must use a database ID in a URL, consider adding additional information that has no purpose other than to make the URL readable. Consider a URL for a specific session in our events application. The Title property isn t necessarily going to be unique, and it s probably not practical to have people add a text identifier for a session. If we add the word session just for readability, the URL might look something like this:

To secure an entire application against XSRF attacks without requiring the user to explicitly enter a secret, we need to find an alternative approach What we need to accomplish is in essence to allow our application to determine whether an HTTP request resulted from the POST of an HTML form that our application itself had earlier sent to our user s browser, or whether the form was one that may have been included in a document sent to the browser by a third party We will attempt to distinguish genuine instances of forms that our application has produced from ones that were forged by a third party based on a token included in a hidden form field (or URL query parameter, if we must use GET requests) Due to the browser s same-origin policy, a malicious page from a third-party site such as wwwhackerhome.

One important property of a widget is its ability to become disabled or inactive. This is managed by the sensitive property, which will disable the widget when set to FALSE with gtk_widget_set_sensitive(). gtk_widget_set_sensitive (other_toggle, FALSE);

http://example.com/houstonTechFest2008/session-87

Sensitivity is actually only one of many widget flags provided by the GtkWidgetFlags enumeration Widget flags, which are in the following list, can be set with GTK_WIDGET_SET_FLAGS() or disabled with GTK_WIDGET_UNSET_FLAGS() You can also get a list of the flags that are set for a widget with GTK_WIDGET_FLAGS() GTK_TOPLEVEL: The widget does not have a parent widget This is usually set for widgets such as windows and menus This flag should always be set throughout a top-level widget s lifetime GTK_NO_WINDOW: The widget does not have its own GdkWindow, so drawing is done with the GdkWindow of the parent You can use this flag to test whether a widget needs a GtkEventBox to catch GDK events GTK_REALIZED: The widget was realized with gtk_widget_realize() This flag will be automatically unset when you unrealize the widget GTK_MAPPED: The widget was mapped with gtk_widget_map().

This isn t good enough though, as it gives no indication what the session is about. Let s add another superfluous parameter to it. The addition has no purpose other

org cannot inspect pages loaded into the browser from our site, wwwmywwwservicecom In particular, the page from wwwhackerhomeorg would not be able to obtain the correct value for the token by inspecting our application's page that contains the form in question If we are able to devise a scheme for generating and validating these tokens such that a malicious third party cannot guess or otherwise obtain a valid token value, we can indeed use the token to distinguish forged from genuine requests Since the token is used to control the execution of state changes or transactions, we refer to it as an action token.