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When you use the methods described so far, your code gets the virtual key state. This means it gets the state of the keyboard based on the messages you have retrieved from your input queue. This is not necessarily the same as the physical keyboard state. For example, consider what happens if the user types faster than your code executes. Each time your KeyPress event fires, you ll have access to the keystroke that fired the event, not the typed-ahead characters. This is almost always the behavior you want. Longtime Windows programmers know that the Win32 API also allows you to get the current state of the keyboard, which might be important if you re building some sort of keyboard logger or macro tool. Although this functionality isn t exposed through .NET, you can get in through an unmanaged call to the Win32 API (known as a Platform Invoke, or PInvoke). The method you need to use is called GetAsyncKeyState(). (By contrast, the .NET behavior matches the unmanaged GetKeyState() function.) GetAsyncKeyState() takes a key value, and returns a value that tells you whether this key is currently pressed, and whether it has been pressed at all since the last GetAsyncKeyState() call. Here s how you make the GetAsyncKeyState() function available in an application: [DllImport("User32.dll")] private static extern short GetAsyncKeyState(System.Windows.Forms.Keys key); Now you can call GetAsyncKeyState() to check the state of any key. There are three possible values that can be returned, as illustrated in this example: // Test for the letter D. short state = GetAsyncKeyState(Keys.D).ToString(); switch (state) { case 0: lbl.Text = "D has not been pressed since the last call."; case 1: lbl.Text = "D is not currently pressed, but has been pressed since the last call." case -32767: lbl.Text = "D is currently pressed."; }

Caution If this newly added drive contains any data that you want to keep, stop the process now!

Once you ve started perfected your table of contents, you re ready to move on to the last stage and compile your project into a single HTML Help file. The compilation process isn t anything like the compilation of a programming language. In fact, your pages aren t changed in any way; they re simply compressed and combined into a single binary file using a proprietary standard. To start the compilation process, select File Compile and click the Compile button. A log that lists the number of topics, links, and the final file size appears. To try out your Help, double-click the .chm file. You ll see something like Figure 22-11.

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// create a plane and add it to the given mesh let addPlaneToMesh (mesh : MeshGeometry3D) xRes yRes = mesh.Positions <- mapPositionsCenter (createPlanePositions xRes yRes) mesh.TextureCoordinates <- createPlaneTextures xRes yRes mesh.TriangleIndices <- createIndicesPlane xRes yRes let movingWaves (t : float) x y = (Math.Cos((x + t) * Math.PI * 4.0) / 3.0) * (Math.Cos(y * Math.PI * 2.0) / 3.0) // create our window let window = createWindow "Window2.xaml" let mesh = // grab the 3D view port let viewport = window.FindName("ViewPort") : > Viewport3D // find all the meshes and get the first one let meshes = findMeshes viewport let mesh = Seq.head meshes // add plane to the mesh addPlaneToMesh mesh 20 20 mesh let changePositions () = let dispatcherTimer = new DispatcherTimer() dispatcherTimer.Tick.Add (fun e -> let t = (float DateTime.Now.Millisecond) / 2000.0 let newPositions = mesh.Positions |> Seq.map (fun position -> let z = movingWaves t position.X position.Y new Point3D(position.X, position.Y, z)) mesh.Positions <- new Point3DCollection(newPositions)) dispatcherTimer.Interval <- new TimeSpan(0,0,0,0,100) dispatcherTimer.Start() let main() = let app = new Application() changePositions()

Now you re ready to use the Help file in a project Just follow these steps: 1 Right-click on your project and choose Add Existing Item Browse to the compiled Help file, and add it to the project (This step is optional, but it makes it easier to keep track of the file and to make sure it s deployed along with the executable) 2 Select the chm file in the Solution Explorer Using the Properties window, change the Copy to Output Directory setting to Copy Always or Copy If Newer 3 Add a HelpProvider to your form and set the HelpProviderHelpNamespace property to the file name of your chm file (like HelpTestchm) Don t worry about specifying a fully qualified path, because you ll be placing the chm file in the same directory as the application executable 4.

Remove the drive from the Windows Home Server, connect it to one of your other home computers, and copy the data.

Add a control that can receive focus (like a button or text box) Set the HelpNavigator property to Topic and set the HelpKeyword property to the original file name of the topic For example, in the previous example you could use Introductionhtm, Welcomehtm, BadHelphtm, and so on 5 Repeat the previous step with a second control, but use a different HelpKeyword value 6 Run the application Switch to one of the controls and press F1 The HTML Help window will appear with the corresponding topic If you switch back to the application, choose a different control, and press F1 again, the original Help window will return to the foreground with the new topic shown This is the preferred way to set up context-sensitive Help, but NET 20 also adds support for the older system of topic numbers.

// show the window app.Run(window) |> ignore [<STAThread>] do main() Executing the code in Listing 8-8 produces the window shown in Figure 8-8. It doesn t show off the animated results, but you should try out the application and see the animated effects for yourself.

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