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There are several kinds of interop that you should be aware of. Cross-language interop is the one you ll see first, and that refers to the ability of C++/CLI to work closely with C# and Visual Basic, and other languages that target the CLR. Because of the common platform, common IL, and assembly and metadata formats, you can use a C# or Visual Basic assembly pretty much as you would another C++/CLI assembly. You can reference it with #using, you can create instances of the types declared in those assemblies, call methods, and so on. You can also go a step further and create inheritance hierarchies that cross language boundaries, such as a C# class that implements a C++/CLI interface, or a C++/CLI class that inherits from a class written in Visual Basic. Once these types are compiled to MSIL, there is little that indicates the original language in which they were authored. In addition to cross-language interop, you may also need to interoperate with native C++ code. The way you choose to interoperate depends on whether you have source code available or only have a binary, whether the native API is exposed as a function or a class, whether the API is exposed via COM, and whether you can recompile the code. Let s first consider the case where you don t have source access, and you simply have a library function in a native DLL that you d like to call from a managed environment. The CLR provides a mechanism for doing this; it s usually referred to as Platform Invoke, or P/Invoke,

To demonstrate how to add map constants using the BizTalk Mapper, suppose that you want to use a constant in conjunction with a String Extraction functoid. In this example, you would like to extract a specified number of characters (five) from the left of the source element value. In the source schema, Customer, you have Zip elements like this: <Zip>98103 00001</Zip> In the destination schema, CustomerRecord, you have Zip elements like this: <Zip>98103</Zip>

To map constants, follow these steps: 1. Set up the BizTalk map with the appropriate source and destination schema, as shown in Figure 3 12.

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Events^ events = gcnew Events(); // Add the event handlers for Start and Exit. events->Start += gcnew EventHandler(events, &Events::OnStart); events->Exit += gcnew EventHandler(events, &Events::OnExit); f(events); // Remove the event handlers. events->Start -= gcnew EventHandler(events, &Events::OnStart); events->Exit -= gcnew EventHandler(events, &Events::OnExit); } The output of Listing 7-17 is as follows: Adding Start event handler. Adding Exit event handler. Firing Start event. Starting Doing something. Firing Exit event. Exiting Removing Start event handler. Removing Exit event handler. The lock object will release its lock when it goes out of scope at the end of the method in which it is used. We have used the EventHandler and EventArgs classes provided by the framework, although in fact any delegate may be used as the event type instead with this pattern. Listing 7-18 is an example of using a delegate unrelated to the System::EventHandler class. You can see that much of the earlier example applies, but the parameters to the event are determined by parameters of the delegate type, EventProcessor. Differences are indicated in boldface. Listing 7-18. Using a Delegate Unrelated to System::EventHandler // events_custom2.cpp #include <msclr\lock.h> using namespace System; using namespace msclr; delegate void EventProcessor(String^ eventString); ref class Events { public:

Figure 3 12. The source and destination schema for the constant mapping example 2. 3. 4. 5. In the left pane, click the Toolbox, and then click the String Functoids tab. Click and drag a String Left functoid onto the map surface. Click the Zip element in the source schema and drag it across to the left point of the String Left functoid. Click the String Left functoid on your map surface, and select Input Parameters in the Properties window. The Configure Functoid Inputs dialog box is now displayed, as shown in Figure 3 13. Notice the first input parameter is the source schema s Zip element. This is automatically configured as a result of dragging the source Zip element onto the map surface.

Figure 2-13. Configure Functoid Inputs dialog box 6. 7. In the Configure Functoid Inputs dialog box, click the Index row (BizTalk will automatically add required input variables). Type in the value 4. As noted, you are extracting five characters for the zip code. Because the functoid is zero-based, the start position will be 0 and the end position will be 4, resulting in five characters.

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