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CHAPTER 12 INTEROPERABILITY
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// allows static T* // allows static T* };
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access to the underlying pointer operator&(native_root% n) { return n.t; } -> to be used to access members operator->(native_root% n) { return n.t; }
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class native_exception {}; // typical native class class NativeClass { FILE* fp; static const int TIME_BUFFER_SIZE = 32; public: NativeClass() { printf("Opening the file.\n"); // Open a file for Unicode writing. int errcode = fopen_s(&fp, "myfile.txt", "a+, ccs=UNICODE"); if (errcode != 0) { throw new native_exception; } } void OutputText(const wchar_t* text) { if (fp) { wprintf(text); fwprintf(fp, text); } else { throw new native_exception; } } void TimeStamp() { tm newtime; __time32_t time; wchar_t time_text[TIME_BUFFER_SIZE]; _time32( &time ); _localtime32_s( &newtime, &time ); _wasctime_s(time_text, TIME_BUFFER_SIZE, &newtime);
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if (fp) { wprintf(time_text); fwprintf(fp, time_text); } else { throw new native_exception; } } ~NativeClass() { printf("Closing the file.\n"); if (fp) { fclose(fp); } } }; // A reference type enclosing a Native Class ref class R { native_root<NativeClass> n; public: R() { } // Marshal the String to a Unicode string // and pass the pointer to the native class method void OutputToFile(String^ s) { IntPtr ptr = Marshal::StringToHGlobalUni(s); n->OutputText(static_cast<wchar_t*>( ptr.ToPointer())); n->TimeStamp(); Marshal::FreeHGlobal(ptr); } }; int main() { R^ r1 = gcnew R(); r1->OutputToFile("Output through native class!\n"); delete r1; // the file is closed
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R r2; r2.OutputToFile("More output\n"); // File is closed again when r2 is cleaned up. } The output of Listing 12-21 is something like the following: Opening the file. Output through native class! Tue Sep 05 23:39:57 2006 Closing the file. Opening the file. More output Tue Sep 05 23:39:57 2006 Closing the file. Notice that a static member, StringToHGlobalUni of the Marshal class, is used to convert from String to wchar_t*. This creates a new wide character array and returns a pointer to it in the form of an IntPtr, which must be freed. We can free the memory with Marshal::FreeHGlobal to say in managed code rather than calling the native API GlobalFree to free the memory. IntPtr has the ToPointer method, which returns a void pointer that we then cast to the desired type for the managed function call.
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Native and Managed Entry Points
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A native function is said to have a native entry point, which is its address. Similarly, a managed function has a managed entry point. A function that may be called by both native and managed code has two separate entry points, one that is the actual function, and another that is a small compiler-generated function known as a thunk, which handles the context switch between native and managed code, and then calls the real function. You know that functions in Visual C++ have calling conventions specifying how parameters are handled by a function you looked at some earlier. The native calling conventions, such as __cdecl, __stdcall, and __thiscall, specify certain ways of passing parameters. Managed functions similarly have a calling convention, __clrcall, that characterizes the particulars about how managed functions are called. A function with the __clrcall calling convention only has a managed entry point. There is no native entry point generated for it. The calling convention for managed functions, and hence the set of entry points that get generated for a function, depends on the compilation mode. In pure mode and safe mode, __clrcall is the default for all managed functions. If you compile in safe mode or pure mode, a managed function will be generated with a managed entry point only, because in those modes, there is no native code that would require a native entry point. However, when you compile in mixed mode (/clr), as is likely in an interop scenario, both native and managed entry points are generated. This is because the calling convention is a native calling convention (__thiscall for methods and likely __cdecl for global functions, but this may be changed by a compiler option).
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