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For integration with COM, COM callable wrappers (CCWs) are used for COM clients accessing NET components, whereas runtime callable wrappers (RCWs) are used for NET clients accessing COM objects Of course, in such scenarios, the NET client can be a NET component itself, whereas a COM client can be a COM object A CCW behaves like a COM object for a COM client, such as a COM client would expect As Figure 4-1 demonstrates, a CCW offers interfaces such as IUnknown and IDispatch for COM clients, although these are not implemented by the NET component Also, the CCW can be found in the registry, because COM clients always expect to find their components there When methods of the CCW are invoked, the CCW invokes methods of the NET components and deals with the issues of garbage collection by doing COM reference counting
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Figure 4-1 A COM callable wrapper (CCW)
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The CCW also deals with the transformation of data types because the data types are different with NET and COM Some data types can
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be mapped directly because they have the same representation in memory, whereas others must be converted The data types with the same memory representation are known as blittable data types (eg, SystemInt16, SystemInt32, SystemInt64) The NET data type SystemString is converted to a COM BSTR data type BSTR is nonblittable If interoperability is used the other way around, an RCW (see Figure 4-2) offers the functionality that a NET client expects and manages a COM object The RCW is a good behavioral client to the COM object and offers pure NET functionality for the NET client With NET, you do not have to pay attention to the release of every reference to every COM interface because this is done by the RCW However, you still have to pay attention to the behavior of the garbage collector with the undeterministic behavior of freeing memory Because you are [6] dealing with native resources (COM objects), you must be aware of the dispose pattern To explicitly release the references to the COM object, you can use the class Marshal with the method ReleaseComObject You can find this class in the namespace SystemRuntimeInteropServices
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Figure 4-2 A runtime callable wrapper (RCW)
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First let's look at a NET component that is used from a COM client Here a simple example is shown with no attributes used to configure COM options In this example, two serviced component classes, and some classes that will be used to pass data to and from the components, are created The first two classesshown in Listing 4-1, Customer and CourseInfoare two simple classes that can be passed as arguments These classes just have private member variables and public properties to access these variables To make it possible that these classes can be transferred across the network, you must mark them with the [Serializable] attribute
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Listing 4-1 Serializable Classes
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[Serializable] public class Customer { private string name; private string company; public Customer(string name, string company)
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{ thisname = name; thiscompany = company; } public string Name { get { return name; } } public string Company { get { return company; } } } [Serializable] public class CourseInfo { private string number; private string title; private int length; private DateTime date;
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public CourseInfo(string number, string title, int length, DateTime date) { thisnumber = number; thistitle = title; thislength = length; thisdate = date; } public string Number { get { return number; } } public string Title { get { return title; } } public int Length { get { return length; }
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} public DateTime Date { get { return date; } } }
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Listings 4-2 and 4-3 show the implementation of the serviced component classes The classCourseManagement implements the interface ICourseManagement, which defines three methods: GetCourse, SetCourse, and GetCourseControl GetCourse returns a CourseInfo object to the client With SetCourse, a CourseInfo object is passed to the server GetCourseControl returns a reference to a CustomerControl object that by itself is a serviced component class The method SetCourse displays a message box just for testing the component To use the MessageBox class, you have to reference the assembly SystemWindowsForms and import the namespace SystemWindowsForms
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