c# - 从 C++CLR 调用 C# 类

Question

我想从 C++CLR 调用 C# 类。我还为此创建了包装器。假设在 C# 类库中:

namespace MyImage
{
   public class DicomHandler
   {
       public void TestImage(DicomImage dicomImage,int height,int width)
       {
       }
   }
   public class DicomImage
   {
   }
}

然后在 Wrapper 中，我创建了 DicomHandler 对象，我需要调用 TestImage(DicomImage dicomImage,int height,int width).

包装类库包括，

在 IWrapper.h 中

#pragma once
#include<windows.h>
#include <string>

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 <windows.h>
#include <vcclr.h>
#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<DicomHandler^> _dicomHandler;
//gcroot<DicomImageHandler^> _dicomImageHandler;
 public:
     Wrapper(){}

virtual DLLAPI void  SetHandle(HWND  handle);
virtual DLLAPI void  TestDicomImage(DicomImage^ _dicomImage,int winwidth,int winheight);


  };

在 Wrapper.cpp 中，

#include "stdafx.h"
#include "Wrapper.h"
#include "IWrapper.h"
#include <windows.h>
#include<iostream>
#include <winuser.h>
#include <tchar.h>
 #include<vcclr.h>
 #include <msclr\marshal_cppstd.h>
    #include <string>
 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->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->TestImage(_dicomImage,width,height);
    }

然后它引发了三个错误，例如

1)error C3395: 'Wrapper::TestDicomImage' : __declspec(dllexport) 不能应用于具有 __clrcall 调用约定的函数

2)error C3395: 'IWrapper::TestDicomImage' : __declspec(dllexport) 不能应用于具有 __clrcall 调用约定的函数

3)error C2259: 'Wrapper': 无法实例化抽象类

如何解决这些错误？请提供解决方案。

Answer 1

解决方案一

这个 SO 答案描述了如何使用 CLI 从 C++ 调用 C# 类(这个例子展示了如何传递一些托管对象的数组):

public ref class CSharpClassName
{
     //code
}

C++ Interop: How do I call a C# class from native C++, with the twist the class is non-static?

这个网站也很有用:

http://www.functionx.com/cppcli/examples/array1.htm

或者这个(有例子):

http://1code.codeplex.com/wikipage?title=Invoke%20.NET%20Assembly%20from%20Native%20C%2b%2b#CLIWrapper

方案二

宿主 CLR

http://1code.codeplex.com/wikipage?title=Invoke%20.NET%20Assembly%20from%20Native%20C%2b%2b#HostCLR

方案三

将 .NET 程序集转换为 COM 服务器，并通过 .NET-COM 互操作从 C++ 调用它 http://1code.codeplex.com/wikipage?title=Invoke%20.NET%20Assembly%20from%20Native%20C%2b%2b#COMInterop