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To begin this chapter, allow me to provide a formal definition of the interface type. An interface is nothing more than a named set of abstract members. Recall from 6 that abstract methods (defined using the VB 2005 MustOverride keyword) are pure protocol, in that they do not provide a default implementation. The specific members defined by an interface depend on the exact behavior it is modeling. Yes, it s true. An interface expresses a behavior that a given class or structure may choose to implement. As you might guess, the .NET base class libraries ship with hundreds of predefined interface types that are implemented by various classes and structures. For example, as you will see in 24, ADO.NET ships with multiple data providers that allow you to communicate with a particular database management system. Thus, unlike COM-based ADO, under ADO.NET we have numerous connection objects we may choose between (SqlConnection, OracleConnection, OdbcConnection, etc.). Regardless of the fact that each connection object has a unique name, are defined within different namespaces, and (in some cases) are bundled within different assemblies, they all implement a common interface named IDbConnection: ' The IDbConnection interface defines a common ' set of members supported by all connection objects. Public Interface IDbConnection Implements IDisposable

You have actually instructed the VB runtime to query the COM type for the IDispatch interface. Note that calling CreateObject() alone does not trigger a query for IDispatch. In addition, you must store the return value in a VB 6.0 Object data type.

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The final bit of IDL that you need to be aware of is how VB 6.0 parameters are expressed under the hood. As you know, under VB 6.0 all parameters are passed by reference, unless the ByVal keyword is used explicitly, which is represented using the IDL [in] attribute. Furthermore, a function s return value is marked using the [out, retval] attributes. Thus, the following VB 6.0 function: ' VB 6.0 function Public Function Add(ByVal x as Integer, ByVal y as Integer) as Integer Add = x + y End Function would be expressed in IDL like so: HRESULT Add([in] short* x, [in] short* y, [out, retval] short* ); On the other hand, if you do not mark a parameter using the VB 6.0 ByVal keyword, ByRef is assumed: ' These parameters are passed ByRef under VB 6.0! Public Function Subtract(x As Integer, y As Integer) As Integer Subtract = x - y End Function ByRef parameters are marked in IDL via the [in, out] attributes: HRESULT Subtract([in, out] short x, [in, out] short y, [out, retval] short* );

This chapter focuses on getting up and running with WCF services and using the simplest of hosts the ASP .NET development server and IIS. You can use IIS for both developing and deploying WCF services. Most of the mechanics of hosting WCF services inside ASP.NET are handled by an implementation of an HttpHandler. This handler is System.ServiceModel. Activation.HttpHandler and is mapped on a per-machine basis in the machine s Web.config file, which is located in the directory %windir%\Microsoft.NET\Framework\v2.0.50727\CONFIG.

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To be sure, the VB 6.0 compiler generates many other IDL attributes under the hood, and you see additional bits and pieces where appropriate. However, at this point, I am sure you are wondering exactly why I spent the last several pages describing the COM IDL. The reason is simple: when you add a reference to a COM server using Visual Studio 2005, the IDE reads the type library to build the corresponding interop assembly. While VS 2005 does a very good job of generating an interop assembly, the Add Reference dialog box follows a default set of rules regarding how the interop assembly will be constructed and does not allow you to fine-tune this construction. If you require a greater level of flexibility, you have the option of generating interop assemblies at the command prompt, using a .NET tool named tlbimp.exe (the type library importer utility). Among other things, tlbimp.exe allows you to control the name of the .NET namespace that will contain the types and the name of the output file. Furthermore, if you wish to assign a strong name to your interop assembly in order to deploy it to the GAC, tlbimp.exe provides the /keyfile flag to specify the *.snk file (see 13 for details regarding strong names). To view all of your options, simply type tlbimp at a Visual Studio 2005 command prompt and hit the Enter key, as shown in Figure 17-12.

While this tool has numerous options, the following command could be used to generate a strongly named interop assembly named CalcInteropAsm.dll: tlbimp SimpleComServer.dll /keyfile:myKeyPair.snk /out:CalcInteropAsm.dll Again, if you are happy with the interop assembly created by Visual Studio 2005, you are not required to directly make use of tlbimp.exe.

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