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<ClassInterface(ClassInterfaceType.AutoDual)> _ <Guid("88737214-2E55-4d1b-A354-7A538BD9AB2D")> _ Public Class DotNetCalc Public Function Add(ByVal x As Integer, ByVal y As Integer) As Integer Return x + y End Function Public Function Subtract(ByVal x As Integer, ByVal y As Integer) As Integer Return x - y End Function End Class On a related note, click the Show All Files button on the Solution Explorer and open up the assemblyInfo.vb file located under the My Project icon. By default, all Visual Studio 2005 project workspaces are provided with an assembly-level <Guid> attribute used to identify the GUID of the type library generated based on the .NET server (if exposed to COM). ' The following GUID is for the ID of the typelib if this project is exposed to COM <Assembly: Guid("EB268C4F-EB36-464C-8A25-93212C00DC89")>

While you are always able to manually add attributes to a .NET type for purposes of COM interop, Visual Studio 2005 provides a project item named Com Class, which can be inserted using the Project Add New Item dialog box. To illustrate, insert a new COM type named DotNetPerson, as you see in Figure 17-17.

Listing 4-3 shows MyService.svc, and Listing 4-4 shows Web.config. Listing 4-3. MyService.svc <%@ ServiceHost Language="C#" Service="MyService" %> using System.ServiceModel; [ServiceContract] public class MyService { [OperationContract] public string HelloWorld ( string yourName ) { return "Hello, World to " + yourName; } }

Although the name of this project item is termed Com Class, it should be clear that what you are really inserting into your project is a .NET class type that is adorned with several attributes that expose this type to COM. Here is the initial code definition of the DotNetPerson:

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Xcode will make a new project for you, containing h and m files for the DudelAppDelegate and DudelViewController classes These contain the exact same sort of boilerplate code that you would typically find in an iPhone project You ll also see that the project has a Resources-iPad directory, which contains the same kind of Interface Builder files you re used to seeing in iPhone projects: MainWindowxib and DudelViewControllerxib The main difference is that these files are set up for iPad, with windows and views that are already iPad-sized The default DudelViewControllerxib file contains a top-level UIView instance, but we re going to make our own view subclass, capable of drawing all the shapes a user creates in the app.

<ComClass(DotNetPerson.ClassId, _ DotNetPerson.InterfaceId, DotNetPerson.EventsId)> _ Public Class DotNetPerson #Region "COM GUIDs" ' These GUIDs provide the COM identity for this class ' and its COM interfaces. If you change them, existing ' clients will no longer be able to access the class. Public Const ClassId As String = "ec2a6ec2-a681-41a1-a644-30c16c7409a9" Public Const InterfaceId As String = "ea905f17-5f7f-4958-b8c6-a95f419063a8" Public Const EventsId As String = "57c3d0e3-9e15-4b6a-a96e-b4c6736c7b6d" #End Region ' A creatable COM class must have a Public Sub New() ' with no parameters; otherwise, the class will not be ' registered in the COM registry and cannot be created ' via CreateObject. Public Sub New() MyBase.New() End Sub End Class As you can see, DotNetPerson has been attributed with the <ComClass> attribute, rather than the <ClassInterface> attribute used previously. One benefit of <ComClass> is that it allows us to establish the necessary GUIDs as direct arguments, as opposed to making use of additional attributes (such as <Guid>) individually. As well, notice that we have already been provided with a set of GUID values, and thus have no need to manually run the guidgen.exe utility.

As explained in the generated code comments, all .NET types exposed to COM must have a default constructor. Recall that when you define a custom constructor, the default is removed from the class definition. Here, the Com Class template ensures this does not happen by explicitly defining the default constructor in the initial code.

Listing 4-4. Web.config < xml version="1.0" > <configuration> <system.serviceModel> <services> <service name="MyService" behaviorConfiguration="returnFaults"> <endpoint contract="MyService" binding="wsHttpBinding"/> </service> </services> <behaviors> <serviceBehaviors> <behavior name="returnFaults"> <serviceMetadata httpGetEnabled="true"/> <serviceDebug httpHelpPageEnabled="true" includeExceptionDetailInFaults="true"/> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> </configuration>

For testing purposes, add a single method to your DotNetPerson type that returns a hard-coded string. Public Function GetMessage() As String Return "I am alive..." End Function

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