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This ProgID generation process usually works flawlessly because ProgIDs can contain periods, except when the complete class name is longer than 39 characters or contains punctuation symbols other than periods In such cases, you should specify a ProgID attribute in your NET source code (See the next section) Noncreatable classes are marked with the noncreatable attribute in the type library Only creatable classes are registered by the RegAsm utility Any coclass generated by the conversion process is assigned a CLSID calculated using a hash function on the complete class name (including its namespace) This technique ensures that different classes generate different CLSIDs, and therefore each NET class is converted to a distinct COM class This technique also ensures that the same CLSID is generated regardless of how many times the conversion process is performed.

You can also assign a custom ID if you need to, as explained in the following section The conversion process generates one class interface for each NET class Interfaces gen erated by the conversion process are assigned an IID calculated using a hash function on the complete interface name (including its namespace) as well as the signatures of its methods The hash function ensures that a different IID is generated if the interface name, the order of its methods, or the signature of any method changes The generation of a new IID is necessary to comply with the immutable interface concept in COM Notice that method names aren t taken into account by the hash function and that you can control the IID value using the Guid attribute, as explained in the next section.

resources for th s chapter conta ns the Update and Draw methods presented n th s sect on and prov des a smooth y chang ng mood ght that goes from dark to ght and back aga n

Only public instance members are exposed through a class interface; shared members, nondefault constructors, and members with a scope other than Public aren t exported to COM You can selectively hide one or more public methods to COM by means of the ComVisible attribute, as I explain in the next section Methods preserve their name when they are exported to a class interface (or any interface, for that matter) However, NET supports method overloading, whereas COM doesn t To let COM clients call overloaded versions of a method, TlbExp generates a distinct method for each overloaded variant and decorates the name of additional.

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methods with an ordinal number, starting at 2, so that each method is assigned a unique name. For example, three overloaded versions of a method named MyMethod are exported as MyMethod, MyMethod_2, and MyMethod_3. There is no guarantee that numbers will be assigned always in the same order if you repeat the export process. Marshaling data from COM to .NET works along the same general guidelines described earlier in this chapter. However, you should be careful about .NET method signatures when working with Visual Basic 6 as a client. A Visual Basic 6 client can t call a .NET method that takes an array by value. You should change the method signature so that the array is passed ByRef, which is the only legal way to pass array arguments in earlier Visual Basic versions.

4

Set o = CreateObject( SampleNetComponent.NetComponent )

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o.MyMethod()

You can control which type of class interface the export process generates by means of the ClassInterface attribute. This attribute can take one of the following ClassInterfaceType enumerated values: AutoDispatch (the default methods are accessible via late binding only), AutoDual (methods are accessible through early and late binding), and None (no class interface is created and only methods in secondary interfaces can be accessed). Here s how you must decorate a class to offer support for both early binding and late binding:

Clients of a class flagged with the ClassInterface attribute that specifies an AutoDual interface type can access public fields and the four instance methods that all .NET classes inherit from System.Object; these two kinds of members aren t visible if you decorate the class with the ComClass attribute. However, a class flagged with just the ClassInterface attribute doesn t make its events visible to clients. To solve this problem, I need to introduce two more attributes.

pane of the Design Gallery, click Logos. If necessary, enlarge the gallery window by dragging its border so you can see the logos in the center pane.

Let s say that you have the following .NET class:

Public Class Person Public Event GotEmail(ByVal msg As String) Public Event TodayIsMyBirthday(ByVal age As Integer) End Class

1. False. If only. The phone is constrained by the amount of energy that can be stored in the batteries it uses. Although these batteries do provide an impressive amount of power, they are finite. This means that programs designed for the platform must take into account that they are working in a constrained environment.

Part VII: