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That wraps up our investigation of how a .NET application can communicate with a legacy COM application. Now be aware that the techniques you have just learned would work for any COM server at all. This is important to remember, given that many COM servers might never be rewritten as native .NET applications. For example, the object models of Microsoft Outlook and Microsoft Office products are currently exposed as COM types. Thus, if you needed to build a .NET program that interacted with these products, the interoperability layer is (currently) mandatory.

The next topic of this chapter is to examine the process of a COM application communicating with a NET type This direction of interop allows legacy COM code bases (such as your existing VB 60 projects) to make use of functionality contained within newer NET assemblies As you might imagine, this situation is less likely to occur than NET to COM interop; however, it is still worth exploring For a COM application to make use of a NET type, we somehow need to fool the COM program into believing that the managed NET type is in fact unmanaged In essence, you need to allow the COM application to interact with the NET type using the functionality required by the COM architecture.

So, Table 4-3 compares WCF s programming model to ASP .NET 2.0 web services and WSE. Table 4-3. Attribute Programming Model Comparison

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For example, the COM type should be able to obtain new interfaces through QueryInterface() calls, simulate unmanaged memory management using AddRef() and Release(), make use of the COM connection point protocol, and so on Again, although VB 60 does not expose this level of COM infrastructure to the surface, it must exist nonetheless Beyond fooling the COM client, COM to NET interoperability also involves fooling the COM runtime As you know, a COM server is activated using the COM runtime rather than the CLR For this to happen, the COM runtime must look up numerous bits of information in the system registry (ProgIDs, CLSIDs, IIDs, and so forth) The problem, of course, is that NET assemblies are not registered in the registry in the first place! In a nutshell, to make your NET assemblies available to COM clients, you must take the following steps: 1 Register your .

When exploring the new iPad-centric SDK features in later chapters, you ll immediately see that Apple has provided extensive tools for creating very robust apps With this newfound power at your fingertips, many of you may be inclined to build apps that mimic traditional desktop interface models, derived from years of programming for Mac OS X, Microsoft Windows, or Linux Even though the iPad platform removes many of the user interface design restraints and memory limitations that developers grappled with on the iPhone, this would be entirely the wrong approach There s a reason Apple used iOS instead of Mac OS X as the iPad s operating system Beyond the fact that it was designed for a finger-based touchscreen, iOS also serves another valuable role Unlike traditional desktop operating systems, iOS hides the filesystem from users, placing the focus instead on content.

NET assembly in the system registry to allow the COM runtime to locate it 2 Generate a COM type library (*tlb) file (based on the NET metadata) to allow the COM client to interact with the public types 3 Deploy the assembly in the same directory as the COM client or (more typically) install it into the GAC As you will see, these steps can be performed using Visual Studio 2005 or at the command line using various tools that ship with the NET Framework 20 SDK..

[WebServiceAttribute] [WebMethodAttribute]

In addition to performing these steps, you will typically also need to decorate your VB 2005 types with various .NET attributes, all of which are defined in the System.Runtime.InteropServices namespace. These attributes ultimately control how the COM type library is created and therefore control how the COM application is able to interact with your managed types. Table 17-4 documents some (but not all) of the attributes you can use to control the generated COM type library. Table 17-4. Select Attributes of System.Runtime.InteropServices

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