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The example will use a simple Visual Basic 6 COM (ActiveX DLL) component that exposes two interfaces The complete solution is contained in the chapter sample code s Visual Basic 6 Project folder The following code snippets listings 10 1 and 2 are just the method signatures representing the Visual Basic 6 COM interface This example is meant as an illustration of a Visual Basic 6 component and should not be viewed as a Visual Basic 6 best practice When looking at Visual Basic 6 COM components, you ll soon notice some issues related to how the WCF interfaces leverage type library information in regard to COM+ application components Visual Basic 6 COM packs both the component logic and the type library information inside the COM DLL; this adds some attributes that prevent some interfaces from being initially wrapped in WCF COM+ integration.

code that you create to work directly against the schema (there is no good reason for doing this) is created at your own risk because it may not be compatible with the next version.

The following code is invalid due to invalid placement of the #pragma directives:

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Prior to working through this example, set up a virtual directory in IIS called VB6ComSample that is set for ASPNET 20 and has anonymous access enabled The PositionManagement interface shown in Listing 10 1 provides a set of simple methods that allow the retrieval of the position for a given ticker, in addition to a method for updating the persisted quantity associated with a ticker3 One element that is not shown is a constructor COM+ objects don t offer a constructor They can provide information in other ways, such as with an initialization method Visual Basic 6 and COM offer several ways of providing static configuration information, such as COM+ initialization strings on the configured component; however, that requires implementing IObjectConstructString in Visual Basic 6 and using the ConstructionEnable attribute in NET For the sake of simplicity in this example, we re just showing method interfaces.

int ErrorFunction(int a, int b) { #pragma unmanaged // Some unmanaged code #pragma managed // Some managed code }

When we first looked at this, we had only two questions: How does the designer know what is contained within the class if it is not held in the XML, and what the heck is the HashCode for It turns out that both are excellent questions, although the answer to the first question was obvious after it was explained to us All of the information displayed on the design surface is gathered from the class itself It is not stored as metadata specifically for the Class Designer This is how Microsoft ensures that the data displayed on the designer is identical to the information in the code The HashCode s purpose turns out to be a lot more complicated As noted in Table 11-10, the HashCode is a hash of everything found in the type.

Unsafe Code Since the #pragma unmanaged directive causes unsafe code to be generated, you need to compile it with the /clr option. If you try to compile it with the /clr:safe option, you will get a whole bunch of errors.

But what is it used for It is used to match the object on the designer to the type in the code It allows the Class Designer to know what object to find and interrogate in order to populate the class details The explanation makes sense, but then you may have yet another question: What if you change the name of the file that your type is stored in, change the name of the type, change the method names, add or a delete a few methods or properties, and so on Another good question The Class Designer uses a fuzzy logic search algorithm to try to match up the type of the Class Designer with the type in your solution If it cannot do this, the type shape will still appear in the designer, though it will be red.

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