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In all the other cases, you rely on the menu item s ability to change its checked state, and you invalidate the form content to force the redraw of the window: let setupMenu () = let menu = new MenuStrip() let fileMenuItem = new ToolStripMenuItem("&File") let settMenuItem = new ToolStripMenuItem("&Settings") let exitMenuItem = new ToolStripMenuItem("&Exit").

Using stateful packet inspection (SPI), a firewall appliance holds the significant attributes of each connection in memory. These attributes, collectively known as the state of the connection, include such details as the IP addresses and ports involved in the connection and the sequence of packets traversing the connection. The most CPUintensive checking is performed at the time of the start of the connection. All packets after that (for that session) are processed rapidly because it is simple and fast to

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menu.Items.Add(fileMenuItem) |> ignore menu.Items.Add(settMenuItem) |> ignore fileMenuItem.DropDownItems.Add(exitMenuItem) |> ignore settMenuItem.DropDownItems.Add(menuBezier) |> ignore settMenuItem.DropDownItems.Add(menuCanonical) |> ignore settMenuItem.DropDownItems.Add(menuControlPoints) |> ignore exitMenuItem.Click.Add(fun _ -> form.Close ()) menuBezier.Click.Add(fun _ -> form.Invalidate()) menuCanonical.Click.Add(fun _ -> form.Invalidate()) menuControlPoints.Click.Add(fun _ -> form.Invalidate()) menu You re now ready to use the functions you defined to configure the controls. You set up the scrollbar and register the controls in the form and the event handlers for the various events. Finally, you start the application s event loop and play with it: scrollbar.ValueChanged.Add(fun _ -> form.Invalidate()) form.Controls.Add(scrollbar) form.MainMenuStrip <- setupMenu() form.Controls.Add(form.MainMenuStrip) form.Paint.Add(fun e -> paint(e.Graphics)) form.MouseDown.Add(fun e -> mouseDown(e.Location)) form.MouseMove.Add(fun e -> mouseMove(e.Location)) form.MouseUp.Add(fun e -> movingPoint <- -1) form.Show() If you re not using F# Interactive, don t forget to add the following: [<STAThread>] do Application.Run(form)

Lookout Mobile (Figure 14 14) is a free app that provides three valuable services: phone location, virus protection, and backup. You can enable or disable the services as you choose. For remote location and backup, you need to register with their web site at www.mylookoutmobile.com. You can also schedule backup times for times when you know your phone will be in its charger. Virus protection may not seem like a huge deal right now, but as smartphones and the Android platform gain popularity, it s a problem that could grow. Lookout Mobile scans apps as you download them, which means downloads do take slightly longer to install.

determine whether they belong to an existing, prescreened session. Once the session has ended, its entry in the state table is discarded. Most modern firewalls, including those in some Linksys and Netgear routers found at your local consumer electronics store, will have basic SPI features, as does the Mac OS X Snow Leopard software firewall. Consumer-grade appliances have a limited amount of memory and cannot inspect as many packets as rapidly or as closely as a more advanced device, such as some CheckPoints, SonicWalls, or Ciscos. Typically, SPI on these firewalls will check only the source of the packet against the source defined in the header. Deep packet inspection (DPI) is a subclass of SPI that examines the data portion of a packet and searches for protocol noncompliance, or some predefined pattern, in order to decide whether the packet is allowed to pass. This is in contrast to the simple packet inspection found in non-stateful firewalls, in which just the header portion of a packet is checked. DPI classifies traffic based on a signature database (as does SPI), and will allow you to redirect, mark, block, rate limit, and of course report based on the classification. Many DPI devices, rather than simply relying on signature-based detection, can also identify patterns of potentially malicious traffic in the flow of traffic. This allows devices to detect newer attacks rather than react to predefined attacks, providing for a more secure network. If your environment has the budget to acquire a firewall that performs deep packet inspection, you should strongly consider adding one to your network. For the security it provides, it is well worth the investment.

The Curves example from the previous section draws inside a form by handling events. This is a rare way to draw things in graphical applications, because the resulting code is scarcely reusable, and drawing on the surface of a form raises issues when additional controls have to be placed in its client area. User controls are the abstraction provided by the Windows Forms framework to program custom controls. If delegation is used to handle events generated from controls, inheritance and method overriding are the tools used to handle them in controls.

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