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In Visual C++ 2008, a new library has been introduced that simplifies the code in this chapter. This feature is known as the marshaling library. Before the marshaling library, the traditional approach involved using pinning pointers, which I ll cover later in this chapter. The marshaling library is referenced by including the <msclr\marshal.h> header. The marshal_as template function in the msclr::interop namespace performs the conversions. This template function takes two template parameters, but only one of the template parameters must be explicitly specified, namely, the destination type. The other template parameter is conveniently inferred from the type of the arguments supplied when marshal_as is called. Thus, if you want to marshal from a pointer to const wchar_t to a handle to String, you would write the following: const wchar_t* source; String^ dest = marshal_as<String^>(source); Some conversions require memory to be allocated, which must later be freed. Such conversions require an object called a context that can be deleted when it is no longer needed. Converting from a managed String to a native character pointer requires a context, because a temporary copy of the String is used during the conversion. The code would look like this:

You now have a working and waiting correlation set and type. To use those, you ll need to create the appropriate Send and Receive shapes that will take advantage of the newfound ability. If an incoming order satisfies the greater than $1,000 requirement, you ll need to export the file to a send port and create a corresponding receive port to receive it after the accounting department has updated the file. You ll then need to handle the logic for approved and denied orders. When the order is sent out for approval, the corresponding <Status> element will be modified to either Approved or Denied. Based on that status code, you ll need to take the appropriate actions. In the current scenario, you ll simply dump approved orders into one folder and denied orders into another. 1. Add a Send shape, just below the LargeOrder shape. 2. Set the Message property of the shape to order. 3. Change the Name property to SendLargeOut. 4. Click the Initializing Correlation Sets drop-down list and select the only option listed.

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marshal_context context; String^ str; const wchar_t* dest = context.marshal_as<const wchar_t*>(str); Some conversions are predefined, mostly involving various string types, and some you need to define yourself. Fortunately, the marshaling library is easily extended. Alternatively, you can find code for many conversions on the Internet site http://marshal-as.net. Using the marshaling library, you could rewrite Listing 13-6 as shown in Listing 13-10. Listing 13-10. P/Invoke Using the Marshaling Library // pinvoke_marshaling.cpp #include <msclr\marshal.h> using namespace System; using namespace System::Runtime::InteropServices; using namespace msclr::interop; // Use the native string types directly this time [DllImport("user32.dll", CharSet=CharSet::Auto)] int MessageBox(IntPtr, const wchar_t*, const wchar_t*, unsigned int type); int main() { String^ message = "Hello World!"; String^ caption = "Win32 Message Box"; marshal_context context; MessageBox(IntPtr::Zero, context.marshal_as<const wchar_t*>(message), context.marshal_as<const wchar_t*>(caption), 0); } The behavior and output is the same as before. However, you ll notice that the first parameter, a window handle (HWND), wasn t marshaled. It was just left as IntPtr::Zero. The definition of HWND is in the Windows headers, which you cannot include in safe mode. In practice, P/Invoke is usually used in safe mode. Also, because P/Invoke does its own marshaling anyway, the marshaling library doesn t add a lot to P/Invoke code. In the following sections, you ll see that the marshaling library is extremely useful when you are writing mixed-mode code, since you may be doing a lot of conversions between native and managed types.

But all the intricacies of building the HTML and updating the region of the page are handled for you, so you don t have to explicitly code all the asynchronous handling and HTML updating yourself.

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