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The sample iPad app we ll create will let the user create some on-screen graphics using a handful of tools, similar to what you might see in a vector-drawing application like Adobe Illustrator. We ll call it Dudel. See Figure 4 2 for a glimpse of Dudel in action. Apart from showing the use of B zier paths, this application will serve as the foundation for demonstrating other technologies throughout the book. We ll add one piece at a time as we work through the book, evolving and improving the app as we introduce new features. This means that in this chapter, we ll need to do a bit of project setup before we get to the actual B zier paths. Please bear with me it s going to be worth the wait!

In the next example, you specify ClassInterfaceType.AutoDual as the class interface designation. In this way, late binding clients such as VBScript can access the Add() and Subtract() methods using IDispatch, while early bound clients (such as VB 6.0 or C++) can use the class interface (named _VbDotNetCalc).

Also, to ensure you focus on how the services are created, we will use only IIS as the hosting environment. ( 5 discusses other WCF hosting options.)

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To illustrate a COM type communicating with managed code, assume you have created a simple VB 2005 Class Library project named ComUsableDotNetServer, which defines a class named DotNetCalc. This class will define two simple methods named Add() and Subtract(). The implementation logic is trivial; however, notice the use of the <ClassInterface> attribute: ' We need this to obtain the necessary ' interop attributes. Imports System.Runtime.InteropServices <ClassInterface(ClassInterfaceType.AutoDual)> _ 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 As mentioned earlier in this chapter, in the world of COM, just about everything is identified using a 128-bit number termed a GUID. These values are recorded into the system registry in order to define an identity of the COM type. Here, we have not specifically defined GUID values for our DotNetCalc class, and therefore the type library exporter tool (tlbexp.exe) will generate GUIDs on the fly. The problem with this approach, of course, is that each time you generate the type library (which we will do shortly), you receive unique GUID values, which can break existing COM clients. To define specific GUID values, you may make use of the guidgen.exe utility, which is accessible from the Tools Create Guid menu item of Visual Studio 2005. Although this tool provides four GUID formats, the <Guid> attribute demands the GUID value be defined using the Registry Format option, as shown in Figure 17-16.

Once you copy this value to your clipboard (via the Copy GUID button), you can then paste it in as an argument to the <Guid> attribute. Be aware that you must remove the curly brackets from the GUID value! This being said, here is our updated DotNetCalc class type:

Listing 4-2 shows MyService.asmx. Listing 4-2. MyService.asmx <%@ WebService Language="C#" Class="MyService" %> using System.Web.Services; [WebService] public class MyService : System.Web.Services.WebService { [WebMethod] public string HelloWorld ( string yourName ) { return "Hello, World to " + yourName; } }

Launch Xcode, and use the menu or Xcode s friendly startup panel to create a new project. Select iPhone OS Application in the upper left, which will bring up the familiar set of application templates in the main section. Here, you ll see a few changes compared to older SDKs. First is the addition of the new Split View-based Application template, which we ll cover in 8. Click around to explore the various application templates. You ll see that each shows a product type in the center of the window. Some project types are only for the iPhone or only for the iPad; for those, the product type (iPhone or iPad) is displayed in a label. Other project types can apply to either platform; for those, you get a popup menu that lets you choose iPhone, iPad, or Universal (to support both). Of course, our focus is iPad apps, but in 11, you ll learn how to have your app support both the iPhone and the iPad. For our project, pick the View-based Application template, select iPad from the product menu, and click the Choose button. Tell the familiar save panel where you want to save this new project, and name it Dudel.

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