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If you add a registry key at installation time, you should remove it when the .NET class is unregistered as a COM component. In this case, you create another static procedure and mark it with the ComUnregisterFunction attribute:

You determine how many states you want the machine to have based on the job the machine is doing The simplest state machine has only two states (perhaps active and inactive), but a game might have many different states (attract mode, main menu, game active, paused, and game over) 8 False We saw that a game can have a master state machine that holds the state of the game itself (Main Menu, Playing, or Paused) Then when in the Playing state a game can be in a variety of modes, depending on the game For example, the game could have a Boss mode when the player is fighting the end of level boss A game will have lots of state machines inside it And remember that individual game objects for example, an alien game sprite can have states as well 9 False.

<ComUnregisterFunction()>_ Private Shared Sub UnRegister(ByVal ty As Type) Registry.CurrentUser.DeleteSubKey(COMPANYKEY) End Sub

Both these procedures can be private or public, provided that they are marked with the Shared keyword and take a System.Type argument; this Type value identifies the class being registered or unregistered.

configuration that includes the Component Services plug-in by running the mmc.exe application with the /a switch (for Author mode) and then choosing the Add/Remove Snap-In command from the File menu.

Figure 31-1

See Also For information about grouped objects, see Connecting and Grouping Shapes in 2, Creating Visual Interest.

The MMC application gives you a visual front end to the COM+ catalog. The COM+ cat alog contains essential information about all registered COM+ components, such as whether they run in the client s memory or in the server s memory, which users can instantiate them or call their methods, and under which account they run. You can expand the Running Process element to list the COM+ applications that are currently running, actually see their components spinning, and determine how many objects are running and how many methods have been called on them.

A program has to respond only to events that are relevant to a particular state However, keep in mind that it is not possible for events to upset a program and make it do the wrong thing if they occur 10 False The game receives a messages saying that it has been deactivated, but the game itself will continue to run However, it will not have the foreground of the display, so the player will not be able to interact with it When a game is deactivated in this way, it should go into pause mode..

Instead of describing how to leverage COM+ features from Visual Basic .NET in an abstract fashion, I will begin by showing you how to create a simple serviced compo nent with Visual Basic .NET and how to use it from a client application. I will then implement new features in most cases by just adding attributes and explain how you can leverage them to create better applications. COM+ transactions are used in portions of the .NET Framework other than serviced components. You might want to review the Transaction attribute in the @Page directive of Web Forms (which I briefly mentioned in 24) and the TransactionOption argument of the WebMethod for Web services (which I covered in 29). Remember that serviced components are supported only under Windows 2000, Win dows XP, and Windows Server 2003 that is, all platforms that support COM+. Serviced components aren t supported under MTS running under Windows NT 4.

31:

Note To keep the code as concise as possible, all the code samples in this chapter assume the use of the following Import statements at the file or project level:

Imports Imports Imports Imports System.EnterpriseServices System.Runtime.InteropServices System.Messaging System.Data.SqlClient

In this exercise, you will open an existing publication, move from page to page, and then change the zoom level to suit your needs. USE the Opening publication. This practice le is located in the Documents\Microsoft Press\