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POcall C# class from C++CLR
 

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    <p>I want to call <code>C#</code> class from <code>C++CLR</code>. I have also created the wrapper for the same. Suppose In <code>C#</code> class library:</p> <pre><code>namespace MyImage { public class DicomHandler { public void TestImage(DicomImage dicomImage,int height,int width) { } } public class DicomImage { } } </code></pre> <p>Then in the <code>Wrapper</code>, I have created the object of <code>DicomHandler</code> and I need to call the <code>TestImage(DicomImage dicomImage,int height,int width)</code>.</p> <p>Wrapper class library includes,</p> <p>In IWrapper.h</p> <pre><code>#pragma once #include&lt;windows.h&gt; #include &lt;string&gt; using namespace MyImage; #ifdef MANAGEDWRAPPER_EXPORTS #define DLLAPI __declspec(dllexport) #else #define DLLAPI __declspec(dllimport) #pragma comment(lib,"F:\\8May\\firebreath-FireBreath-firebreath-1.7.0-0- gdf8659e\\firebreath\\Wrapper\\Debug\\Wrapper.lib") #endif class IWrapper { public: static IWrapper *CreateInstance(); static void Destroy(IWrapper *instance); virtual DLLAPI void Sethandle(HWND handle)=0; virtual DLLAPI void TestDicomImage(DicomImage^ _dicomImage,int width,int height)=0; }; In Wrapper.h, #pragma once #include &lt;windows.h&gt; #include &lt;vcclr.h&gt; #include "IWrapper.h" #include "stdio.h" #include "string.h" using namespace System; using namespace System::Reflection; using namespace System::IO; using namespace MyImage; using namespace std; using namespace System::Runtime::InteropServices; class Wrapper:public IWrapper { private: gcroot&lt;DicomHandler^&gt; _dicomHandler; //gcroot&lt;DicomImageHandler^&gt; _dicomImageHandler; public: Wrapper(){} virtual DLLAPI void SetHandle(HWND handle); virtual DLLAPI void TestDicomImage(DicomImage^ _dicomImage,int winwidth,int winheight); }; </code></pre> <p>In Wrapper.cpp,</p> <pre><code>#include "stdafx.h" #include "Wrapper.h" #include "IWrapper.h" #include &lt;windows.h&gt; #include&lt;iostream&gt; #include &lt;winuser.h&gt; #include &lt;tchar.h&gt; #include&lt;vcclr.h&gt; #include &lt;msclr\marshal_cppstd.h&gt; #include &lt;string&gt; using namespace System::Reflection; using namespace System::Runtime::InteropServices; using namespace System; using namespace System::IO; using namespace std; using namespace DicomImage; void Wrapper::SetHandle(HWND handle) { _dicomHandler=gcnew DicomHandler; //_dicomImageHandler=gcnew DicomImageHandler; _dicomHandler-&gt;SetHandle((System::IntPtr)handle); } IWrapper *IWrapper::CreateInstance() { IWrapper *instance =(IWrapper*)new Wrapper(); return (instance); } void IWrapper::Destroy(IWrapper *instance) { delete instance; } void Wrapper::TestDicomImage(DicomImage^ _dicomImage,int width,int height) { _dicomHandler-&gt;TestImage(_dicomImage,width,height); } </code></pre> <p>then It raises three Errors like</p> <p>1)error C3395: 'Wrapper::TestDicomImage' : __declspec(dllexport) cannot be applied to a function with the __clrcall calling convention</p> <p>2)error C3395: 'IWrapper::TestDicomImage' : __declspec(dllexport) cannot be applied to a function with the __clrcall calling convention </p> <p>3)error C2259: 'Wrapper' : cannot instantiate abstract class </p> <p>How to fix these errors?Please provide me the solution for it.</p>
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