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The DispatcherServlet and Spring Controllers treat views in an implementation-agnostic manner. That means you can define one or more views using different technologies and either use them together or switch them around without impacting any of your Controller code. In many cases, you need make no more than a single change to a configuration file in order to replace the entire view tier of your application with a new one! Two interfaces org.springframework.web.servlet.View and org.springframework.web.servlet.ViewResolver primarily make this possible. Listing 7-1 shows the definition of the View interface.

// when this application is built with /clr, GetLastError will be 0, // otherwise it will be 0x57! printf("Indirect call caused error code 0x%X\n", GetLastError()); } When this application is built with /clr, the output will be as follows: Direct call caused error code 0x57 Indirect call caused error code 0x0 If you face this problem in your code, you must move the indirect function call and the call to GetLastError to native code. This will ensure that neither the native function nor the GetLastError function will be called via a thunk, and the correct GetLastError value will be returned.

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The DrawRectangle method class in Listing 11-2 will draw a simple solid-filled white rectangle. In this example, no outline will be drawn, so the code uses an outline thickness of 0 pixels. The start color and end color are both set to white, which causes the rectangle to be filled entirely with the same color. Listing 11-2. Drawing a White, Solid-Filled Rectangle bmp.DrawRectangle(Color.White, 0, 100, 100, 200, 100, 0, 0, Color.White, 0, 0, Color.White, 0, 0, Bitmap.OpacityOpaque); // // // // // // // // // // outline color outline thickness x and y of top left corner width and height x and y corner radius gradient start color gradient start coordinates gradient end color gradient end coordinates opacity

Listing 7-1. View Interface Definition public interface View { void render(Map model, HttpServletRequest request, HttpServletResponse response) throws Exception; }

So far, I have discussed P/Invoke metadata and thunks only from a performance point of view. If you call managed functions in a context that is not performance critical, you probably prefer convenience over performance. C++/CLI interoperability already provides a lot of convenience you only need normal function declarations to call a managed function from native code. However, depending on the argument types of the target method, it is still possible that you have to write some code yourself to marshal managed types to native argument types manually. In the following code sample, the managed class System:Environment is used to get the name of the user that executes the current thread. To pass the content of the managed string returned by Environment::UserName to a function like MessageBoxA, which expects a native null-terminated ANSI code string, the managed string must be marshaled first. Therefore, Marshal::StringToCoTaskMemAnsi is called. To clean up the native string returned by Marshal::StringToCoTaskMemAnsi, the helper function Marshal::FreeCoTaskMem is used: // ManualMarshaling.cpp // build with "CL /clr ManualMarshaling.cpp" #include <windows.h> #pragma comment(lib, "user32.lib") using namespace System; using namespace System::Runtime::InteropServices; int main() { String^ strUserName = Environment::UserName; IntPtr iptrUserName = Marshal::StringToCoTaskMemAnsi(strUserName); const char* szUserName = static_cast<const char*>(iptrUserName.ToPointer()); MessageBoxA(NULL, szUserName, "Current User", 0); Marshal::FreeCoTaskMem(iptrUserName); }

Note Many of Spring s high-level interfaces consist only of a single method. This facilitates the maximum

To draw a rectangular frame, you need to set the opacity to Bitmap.OpacityTransparent (see Listing 11-3), which draws an unfilled rectangle with only a border with the selected border color and thickness. The border frame is always drawn fully opaque with the border color regardless of the opacity value; the opacity value only affects filling.

amount of reuse from interfaces and makes them good candidates for anonymous inner class implementations.

Listing 11-3. Drawing a Rectangular Frame bmp.DrawRectangle( Color.White, 1, 100, 100, 200, 100, 0, 0, Color.White, 0, 0, Color.White, 0, 0, Bitmap.OpacityTransparent);

Instead of writing explicit code to marshal managed string arguments to native strings passed to the target function, you can write a custom P/Invoke function that benefits from P/Invoke type marshaling: // PInvokeMarshaling.cpp" // build with "CL /clr PInvokeMarshaling.cpp" #include <windows.h> using namespace System; using namespace System::Runtime::InteropServices; namespace PInvoke { [DllImport("user32.dll", CharSet=CharSet::Ansi, // marshal String^ to LPCSTR EntryPoint = "MessageBoxA", ExactSpelling = true)] UINT MessageBoxA(HWND, String^, String^, UINT); } int main() { String^ strUserName = Environment::UserName; PInvoke::MessageBoxA(NULL, strUserName, "Current User", 0); }

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