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A best practice in WCF is to define a contract up front, as an interface, and then provide the implementation of that interface in a concrete class. Why This provides a clear abstraction of the contract from the implementation. The other aspect of this approach is a clear distinction of the service boundary (remember the boundaries are explicit SOA tenet) from the implementation. Although the service interface definition is in code, and not in metadata, it s a clear perimeter that permits some flexibility for exposing only what s necessary and that provides design-time and configuration-time flexibility.

Once you have run regasm.exe or enabled the Register for COM Interop option, you will find that your bin\Debug folder now contains a COM type library file (taking a *.tlb file extension).

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Now that you have generated the corresponding COM type library, you can view its contents using the OLE View utility by loading the *.tlb file. If you load ComUsableDotNetServer.tlb (via the File View Type Library menu option), you will find the COM type descriptions for each of your .NET class types. For example, the DotNetCalc class has been defined to support the default _DotNetClass interface (due to the <ClassInterface> attribute, as well as an interface named (surprise, surprise) _Object. As you would guess, this is a unmanaged definition of the functionality defined by System.Object: [uuid(88737214-2E55-4D1B-A354-7A538BD9AB2D), version(1.0), custom({0F21F359-AB84-41E8-9A78-36D110E6D2F9}, "ComUsableDotNetServer.DotNetCalc")] coclass DotNetCalc { [default] interface _DotNetCalc; interface _Object; }; As specified by the <ClassInterface> attribute, the default interface has been configured as a dual interface, and can therefore be accessed using early or late binding: [odl, uuid(AC807681-8C59-39A2-AD49-3072994C1EB1), hidden, dual, nonextensible, oleautomation, custom({0F21F359-AB84-41E8-9A78-36D110E6D2F9}, "ComUsableDotNetServer.DotNetCalc")] interface _DotNetCalc : IDispatch { [id(00000000), propget, custom({54FC8F55-38DE-4703-9C4E-250351302B1C}, "1")] HRESULT ToString([out, retval] BSTR* pRetVal); [id(0x60020001)] HRESULT Equals( [in] VARIANT obj, [out, retval] VARIANT_BOOL* pRetVal);

// DudelView.h #import <UIKit/UIKit.h> @protocol DudelViewDelegate @end @interface DudelView : UIView { IBOutlet id <DudelViewDelegate> delegate; } @end

[id(0x60020002)] HRESULT GetHashCode([out, retval] long* pRetVal); [id(0x60020003)] HRESULT GetType([out, retval] _Type** pRetVal); [id(0x60020004)] HRESULT Add([in] long x, [in] long y, [out, retval] long* pRetVal); [id(0x60020005)] HRESULT Subtract( [in] long x, [in] long y, [out, retval] long* pRetVal); }; Notice that the _DotNetCalc interface not only describes the Add() and Subtract() methods, but also exposes the members inherited by System.Object! As a rule, when you expose a .NET class type to COM, all public methods defined up the chain of inheritance are also exposed through the autogenerated class interface.

The next example (Example02 in the downloadable code) follows the best practice of implementing the contract in a defined interface with the implementation provided for separately. The mapping, as you ll soon see, is managed through the framework either programmatically or through configuration options. Listing 4-5 shows MyService.svc. Listing 4-5. MyService.svc <%@ ServiceHost Language="C#" Service="MyService" %> using System.ServiceModel; [ServiceContract] public interface IMyInterface { [OperationContract] string HelloWorld ( string yourName ); } public class MyService : IMyInterface { public string HelloWorld( string yourName ) { return "Hello, World to " + yourName; } }

Now that the .NET assembly has been properly configured to interact with the COM runtime, you can build some COM clients. You can create a simple VB 6.0 Standard *.exe project type (named VB6_DotNetClient) and set a reference to the new generated type library (see Figure 17-20).

As for the GUI front end, keep things really simple. A single Button object will be used to manipulate the DotNetCalc .NET type. Here is the code (notice that you are also invoking ToString(), defined by the _Object interface): Private Sub btnUseDotNetObject_Click() ' Create the .NET object. Dim c As New DotNetCalc MsgBox c.Add(10, 10), , "Adding with .NET"

s Note For Vista users, if you ve run CreateVirtualDirs.bat (from an elevated prompt as required) and

That defines just enough for us to be able to hook it up in Interface Builder. Now we will continue to pull together the rest of the pieces for the nib-based portion of the app. Later on, we ll go back and implement the view itself. The source code archive accompanying this book includes a set of buttons meant for use in Dudel. If you don t have the archive at hand, use your favorite graphics editor (I m partial to GIMP) to create buttons similar to what you see in Table 4-1. They don t need to be pixel-perfect, but should be roughly similar so that your version of the app looks and feels about the same as mine. The button images shown here are 46 by 32, and you should try to stick to a similar size.

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