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TK+ is a system that relies on signals and callback functions. A signal is a notification to your application that the user has performed some action. When a signal is emitted, you can tell GTK+ to run a function named a callback function. To connect a signal, you can use g_signal_connect(). This function accepts four parameters. The first is the GObject you are watching for the signal. The signal_name is a string representing the signal; a list of signal names can be found in the tables throughout this appendix. gulong g_signal_connect (gpointer object, const gchar *signal_name, GCallback handler, gpointer data); The third parameter is the name of the callback function that will be called when the signal is emitted. The form for each callback function can be found in the GTK+ API documentation. However, many of the function prototypes have incomplete documentation, so you can find more information about nonstandard parameters in the signal reference tables throughout this appendix. The last parameter of g_signal_connect() allows you to send data of an arbitrary pointer type to the callback function. You can do this because gpointer is equivalent to C s void pointer type. You can also use g_signal_connect_swapped(), which works the same way as g_signal_ connect(), except the order of the object and data parameters is switched. This allows you to call a function on the data parameter pointer. This appendix provides a complete list of events and signals available to GTK+ objects and widgets. The first section provides information about the GDK event types available to GtkWidget and derivative classes. The sections that follow provide a complete list of signals names and a description for every object with signals in GTK+.

// and # is a delimiter. state = item-id | # | qty | # | address | # | credit_card_no | # | exp_date | # | price; // Compute message authentication code with // server key K. signature_check = MAC(K, state); if (signature == signature_check) { success = authorize_credit_card_charge(price); if (success) { settle_transaction(price); dispatch_delivery_person(); } else { // Could not authorize card tell_user_card_declined(); } } else { // Invalid signature display_transaction_cancelled_page(); log_client_IP_and_info(); } { display_transaction_cancelled_page();

We need to enclose the IE lifecycle in a using block to ensure that the COM resources WatiN uses are properly disposed The IE object is our main gateway to browser automation with WatiN To interact with the browser, the IE object exposes methods for finding, examining, and manipulating DOM elements We use the Link method D to find the Products link by its text, and then click it with the Click method The Link method includes many overloads, and we use the one that selects based on a WatiN BaseConstraint object The Find static class includes helper methods to build constraints that are used to filter the elements in the DOM Once we click the Products link, we navigate to the first Edit link on the page and click it After clicking this link, we re then on the edit screen for a single product.

Events are a special type of signal that are emitted by the X Window System. Once emitted, they are sent from the window manager to your application to be interpreted by the signal system provided by GLib. In doing this, you can use the same signal connection and callback function methods as with normal signals. One difference is that event callback functions return a gboolean value.

We now need to find and fill in the input element for the price Looking at the source, we can see that the input element has a name attribute with a value of "Price", so we search by name attribute to locate the correct Price input element To modify the value of the element, as if we were typing in the value in a browser manually, we set the Value property to a new value E With the value changed, we can now find the Save button by name and click it F If our save completes successfully, we should be redirected back to the products list page If we encounter a validation error, we ll stay on the product edit screen In our scenario, we entered all valid data, so we check to make sure we re redirected back to the products list page G.

If the user clicks yes when asked to confirm the transaction, the server first verifies the signature. The signature is verified by computing signature_check. The algorithm concatenates all the relevant pieces of state information into state. Then, it computes the MAC over the state using the server s key. If signature_check matches the signature provided in the HTTP request, then the request has not been tampered with, and the algorithm proceeds with credit card authorization. If the signature_check does not match the signature provided in the HTTP request, then the client may have tried to alter one or more of the parameters. Even though the parameters are sent to the client in the clear, the server will be able to reliably detect if the client sent back different or altered parameters. By using this signature-based approach, the server does not need to keep track of sessionids. It can continue to be stateless at the expense of having to compute MACs when processing HTTP requests and having to stream state information to and from the client. At the same time, for state-intensive applications, the amount of extra bandwidth required to stream state may be more costly than the server-side storage required for user data in a session-id based solution.