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Windows 2003, Windows XP Service Pack 2, and Windows Vista all provide the HTTP API to allow applications that create HTTP listeners to gain a series of advantages over the traditional Winsock mechanism that has been available in current and prior releases of Windows. WCF is positioned to take full advantage of this capability, which for the most part sat dormant on the client platform. Check out the article Http.sys in WinXP SP2: What It Means with Windows Communication Foundation located at http://www.dotnetjunkies.com/Tutorial/99DD7042-532D-4DB4-86251CD8BF422D64.dcik.

Once you have generated an interop assembly, your .NET applications are now able to make use of their types using early binding or late binding techniques. Given that you have already seen how to create a COM type using early binding at the opening of this chapter (via the VB 2005 New keyword), let s turn our attention to activating a COM object using late binding. As you recall from 14, the System.Reflection namespace provides a way for you to programmatically inspect the types contained in a given assembly at runtime. In COM, the same sort of functionality is supported through the use of a set of standard interfaces (e.g., ITypeLib, ITypeInfo, and so on). When a client binds to a member at runtime (rather than at compile time), the client is said to exercise late binding. By and large, you should always prefer the early binding technique using the VB 2005 New keyword. There are times, however, when you must use late binding to a coclass. For example, some legacy COM servers may have been constructed in such a way that they provide no type information whatsoever. If this is the case, it should be clear that you cannot run the tlbimp.exe utility in the first place. For these rare occurrences, you can access classic COM types using .NET reflection services. The process of late binding begins with a client obtaining the IDispatch interface from a given coclass. This standard COM interface defines a total of four methods, only two of which you need to concern yourself with at the moment. First, you have GetIDsOfNames(). This method allows a late bound client to obtain the numerical value (called the dispatch ID, or DISPID) used to identify the method it is attempting to invoke.

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In COM IDL, a member s DISPID is assigned using the [id] attribute If you examine the IDL code generated by Visual Basic (using the OLE View tool), you will see that the DISPID of the Add() method has been assigned a DISPID such as the following: [id(0x60030000)] HRESULT Add( [in] short x, [in] short y, [out, retval] short* ); This is the value that GetIDsOfNames() returns to the late bound client Once the client obtains this value, it makes a call to the next method of interest, Invoke() This method of IDispatch takes a number of arguments, one of which is the DISPID obtained using GetIDsOfNames() In addition, the Invoke() method takes an array of COM VARIANT types that represent the parameters passed to the function In the case of the Add() method, this array contains two shorts (of some value).

With these plist keys in place, you then want your launch image filenames to adhere to that assigned prefix. For example, your iPad launch images would be named iPadDefault-Portrait.png, iPadDefault-Landscape.png, and so on. Your iPhone launch image would remain Default.png.

Within the httpHandler section of the machine s Web.config, the mapping appears as shown in Listing 4-1. Listing 4-1. *.svc Mapping for WCF Handler <add path="*.svc" verb="*" type="System.ServiceModel.Activation.HttpHandler, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" validate="false" /> The System.ServiceModel.Activation.HttpHandler class is responsible for providing the ServiceHost environment inside the ASP .NET worker process for applications that are hosted on IIS. This handler, just as handlers provide for other extensions (*.aspx, *.asmx), is responsible for providing any runtime compilation of source code embedded inside the *.svc files, in addition to providing update detection of the same source code as is done for the other handler types.

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