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copied!<p>You can create a managed C++ interop DLL to act as a wrapper around the C# library. </p> <p>Most tutorials on managed C++ unfortunately only explain how to wrap unmanaged C++ for use in C#. But it can work the other way also.</p> <p>Define an abstract interface class in your native C++ code, then create a concrete subclass inside the managed C++ DLL. Call into your C# objects in the method implementations.</p> <p>Finally, export a factory function that will instantiate the implementation class and return a base-class pointer that your native code can use.</p> <p>Here's a quick example:</p> <p>First, define the class interface in your native DLL.</p> <p><strong>interopclassbase.h</strong></p> <pre><code>class InteropClassBase { public: virtual void doStuff() = 0; virtual int getValue() = 0; virtual void getString(CString* outStr) = 0; }; </code></pre> <p>Now you need to create a C++/CLI DLL that will allow you to mix native and managed code in a single assembly. Add a new C++ project to your solution, and in the project configuration set the <a href="http://msdn.microsoft.com/en-us/library/k8d11d4s(VS.80).aspx" rel="nofollow noreferrer">"Common Language Runtime Support"</a> option to <strong>Mixed</strong> (/clr). </p> <p>Once you've added a reference to your C# library (which we'll call ManagedLibrary) we can implement the interop class:</p> <p><strong>interopclass.cpp</strong></p> <pre><code>#include "interopclassbase.h" #include <vcclr.h> public class InteropClass : public InteropClassBase { protected: gcroot<ManagedLibrary::ManagedObject^> m_managedObject; public: InteropClass() { m_managedObject = gcnew ManagedLibrary::ManagedObject(); } virtual void doStuff() { m_managedObject->doStuff(); } virtual int getValue() { return m_managedObject->getValue(); } virtual void getString(CString* pOutStr) { System::String^ managedString = m_managedObject->getString(); CString nativeString(managedString); // overloaded CString constructor if (pOutStr) *pOutStr = nativeString; } }; __declspec(dllexport) InteropClassBase* getImplementationPointer() { return new InteropClass(); } </code></pre> <p>Now you just need to load the interop DLL from your native project and call the exported function.</p>

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