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Like any COM object, the CCW is a reference-counted entity. This should make sense, given that the COM client is assuming that the CCW is a real COM type and thus must abide by the rules of AddRef() and Release(). When the COM client has issued the final release, the CCW releases its reference to the real .NET type, at which point it is ready to be garbage collected. The CCW implements a number of COM interfaces automatically to further the illusion that the proxy represents a genuine coclass. In addition to the set of custom interfaces defined by the .NET type (including an entity termed the class interface that you examine in just a moment), the CCW provides support for the standard COM behaviors described in Table 17-5. Table 17-5. The CCW Supports Many Core COM Interfaces

If the .NET type supports any events, they are represented as COM connection points. If the .NET type supports the IEnumerable interface, it appears to the COM client as a standard COM enumerator. These interfaces allow coclasses to send COM error objects.

s Note With some of the IIS-hosted samples, a set of scripts provides the IIS virtual directory creation

These interfaces allow the COM client to pretend to manipulate an assembly s COM type information. In reality, the COM client is interacting with .NET metadata. These core COM interfaces provide support for early and late binding to the .NET type. IDispatchEx can be supported by the CCW if the .NET type implements the IExpando interface.

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In this chapter, we re going to build an example that demonstrates various uses of UIBezierPath. You ll learn how to create complex paths, define drawing characteristics for the paths you create, and use different colors to draw a path s outline (with the stroke color) and its interior (with the fill color).

In classic COM, the only way a COM client can communicate with a COM object is to use an interface reference. In contrast, .NET types do not need to support any interfaces whatsoever, which is clearly a problem for a COM caller. Given that classic COM clients cannot work with object references, another responsibility of the CCW is to expose a class interface to represent each member defined by the type s public sector. As you can see, the CCW is taking the same approach as Visual Basic 6.0!

To define a class interface for your .NET types, you will need to apply the <ClassInterface> attribute on each public class you wish to expose to COM. Again, doing so will ensure that each public member of the class is exposed to a default autogenerated interface that follows the same exact naming convention as VB 6.0 (_NameOfTheClass). Technically speaking, applying this attribute is optional; however, you will almost always wish to do so. If you do not, the only way the COM caller can communicate with the type is using late binding (which is far less type safe and typically results in slower performance). The <ClassInterface> attribute supports a named property (ClassInterfaceType) that controls exactly how this default interface should appear in the COM type library. Table 17-6 defines the possible settings. Table 17-6. Values of the ClassInterfaceType Enumeration ClassInterfaceType Member Name AutoDispatch

and ASP.NET mapping, along with a script to remove the IIS virtual directory when done. The creation/removal scripts are in each example s directory and are named CreateVirtualDirs.bat and DeleteVirtualDirs.bat, respectively. You must be an administrator on the system from where these files are executed. Additionally, if you re on Vista, you must run from an elevated command prompt from the directory where these files exist.

Indicates the autogenerated default interface will only support late binding, and is equivalent to not applying the <ClassInterface> attribute at all. Indicates that the autogenerated default interface is a dual interface and can therefore be interacted with using early binding or late binding. This would be the same behavior taken by VB 6.0 when it defines a default COM interface. Indicates that no interface will be generated for the class. This can be helpful when you have defined your own strongly typed .NET interfaces that will be exposed to COM, and do not wish to have the freebee interface.

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