在C#托管类的方法中，如何传递C++；上课？ 我正在研究一个联合项目，需要包装一个C++ DLL并从C中引用它。

我不是微软技术背景的人，所以如果我的术语不正确，或者这是一个直接的回答，或者是一个已经回答了的问题，我真的很抱歉，但是我肯定找不到这个答案，尽管搜索得很好

到目前为止，另一方已经完成了将相关DLL转换为托管DLL的工作。这使我能够将其作为我的C#项目的参考（我使用的是VS2017）。另一方还向我发送了一个C#示例（仅实现了一个“Clear”方法），说明如何提供包装器，如下所示：

#pragma once
#include "cgcl.h"

using namespace System;
using namespace ThirdParty_DOPRL;

namespace ThirdParty_GCL 
  {
    public ref class CGCL_MAN
      {
        public:
            // Allocate the native object on the C++ Heap via a constructor
            CGCL_MAN() : m_pGCL( new CGCL ) {}

            // Deallocate the native object on a destructor
            ~CGCL_MAN() {
              delete m_pGCL;
            }

        protected:
            // Deallocate the native object on the finalizer just in case no destructor is called
            !CGCL_MAN() {
                delete m_pGCL;
            }

        public:
            void Clear() {
                return m_pGCL->Clear();
            }

        private:
            CGCL * m_pGCL;
      };
  }

  STATUS GetListOfDevProperties(CDeviceObjectPropertyReferenceList &DevicePropertyList) const;

#pragma once

#include "cdoprl.h"

using namespace System;

namespace ThirdParty_DOPRL
{
    public ref class CDOPRL_MAN
    {
    public:
        // Allocate the native object on the C++ Heap via a constructor
        CDOPRL_MAN() : m_pDevObjPropRefList(new CDeviceObjectPropertyReferenceList) {}

        // Deallocate the native object on a destructor
        ~CDOPRL_MAN() {
            delete m_pDevObjPropRefList;
        }

    protected:
        // Deallocate the native object on the finalizer just in case no destructor is called
        !CDOPRL_MAN() {
            delete m_pDevObjPropRefList;
        }

    public:
        bool IsEmpty() {
            return m_pDevObjPropRefList->empty();
        }

        void Clear() {
            return m_pDevObjPropRefList->clear();
        }

        size_t Size() {
            return m_pDevObjPropRefList->size();
        }

    private:
        CDeviceObjectPropertyReferenceList * m_pDevObjPropRefList;
    };
}

            STATUS GetListOfDevProperties(CDOPRL_MAN devPropList) {
                return m_pGCL->GetListOfDevProperties(devPropList);
            }

到目前为止，所有构建都正常工作（即从C#调用Clear（）似乎正在执行）

现在，我想为来自同一非托管类的另一个方法添加存根，如上所述。其在原始头文件中的签名如下：

#pragma once
#include "cgcl.h"

using namespace System;
using namespace ThirdParty_DOPRL;

namespace ThirdParty_GCL 
  {
    public ref class CGCL_MAN
      {
        public:
            // Allocate the native object on the C++ Heap via a constructor
            CGCL_MAN() : m_pGCL( new CGCL ) {}

            // Deallocate the native object on a destructor
            ~CGCL_MAN() {
              delete m_pGCL;
            }

        protected:
            // Deallocate the native object on the finalizer just in case no destructor is called
            !CGCL_MAN() {
                delete m_pGCL;
            }

        public:
            void Clear() {
                return m_pGCL->Clear();
            }

        private:
            CGCL * m_pGCL;
      };
  }

  STATUS GetListOfDevProperties(CDeviceObjectPropertyReferenceList &DevicePropertyList) const;

#pragma once

#include "cdoprl.h"

using namespace System;

namespace ThirdParty_DOPRL
{
    public ref class CDOPRL_MAN
    {
    public:
        // Allocate the native object on the C++ Heap via a constructor
        CDOPRL_MAN() : m_pDevObjPropRefList(new CDeviceObjectPropertyReferenceList) {}

        // Deallocate the native object on a destructor
        ~CDOPRL_MAN() {
            delete m_pDevObjPropRefList;
        }

    protected:
        // Deallocate the native object on the finalizer just in case no destructor is called
        !CDOPRL_MAN() {
            delete m_pDevObjPropRefList;
        }

    public:
        bool IsEmpty() {
            return m_pDevObjPropRefList->empty();
        }

        void Clear() {
            return m_pDevObjPropRefList->clear();
        }

        size_t Size() {
            return m_pDevObjPropRefList->size();
        }

    private:
        CDeviceObjectPropertyReferenceList * m_pDevObjPropRefList;
    };
}

            STATUS GetListOfDevProperties(CDOPRL_MAN devPropList) {
                return m_pGCL->GetListOfDevProperties(devPropList);
            }

因此，我做的第一件事是围绕非托管类CDeviceObjectPropertyReferenceList创建另一个包装器类，如下所示：

#pragma once
#include "cgcl.h"

using namespace System;
using namespace ThirdParty_DOPRL;

namespace ThirdParty_GCL 
  {
    public ref class CGCL_MAN
      {
        public:
            // Allocate the native object on the C++ Heap via a constructor
            CGCL_MAN() : m_pGCL( new CGCL ) {}

            // Deallocate the native object on a destructor
            ~CGCL_MAN() {
              delete m_pGCL;
            }

        protected:
            // Deallocate the native object on the finalizer just in case no destructor is called
            !CGCL_MAN() {
                delete m_pGCL;
            }

        public:
            void Clear() {
                return m_pGCL->Clear();
            }

        private:
            CGCL * m_pGCL;
      };
  }

  STATUS GetListOfDevProperties(CDeviceObjectPropertyReferenceList &DevicePropertyList) const;

#pragma once

#include "cdoprl.h"

using namespace System;

namespace ThirdParty_DOPRL
{
    public ref class CDOPRL_MAN
    {
    public:
        // Allocate the native object on the C++ Heap via a constructor
        CDOPRL_MAN() : m_pDevObjPropRefList(new CDeviceObjectPropertyReferenceList) {}

        // Deallocate the native object on a destructor
        ~CDOPRL_MAN() {
            delete m_pDevObjPropRefList;
        }

    protected:
        // Deallocate the native object on the finalizer just in case no destructor is called
        !CDOPRL_MAN() {
            delete m_pDevObjPropRefList;
        }

    public:
        bool IsEmpty() {
            return m_pDevObjPropRefList->empty();
        }

        void Clear() {
            return m_pDevObjPropRefList->clear();
        }

        size_t Size() {
            return m_pDevObjPropRefList->size();
        }

    private:
        CDeviceObjectPropertyReferenceList * m_pDevObjPropRefList;
    };
}

            STATUS GetListOfDevProperties(CDOPRL_MAN devPropList) {
                return m_pGCL->GetListOfDevProperties(devPropList);
            }

现在回到ThirdParty_GCL（在本文顶部），我假设必须在存根中使用托管类类型，并声明存根如下：

#pragma once
#include "cgcl.h"

using namespace System;
using namespace ThirdParty_DOPRL;

namespace ThirdParty_GCL 
  {
    public ref class CGCL_MAN
      {
        public:
            // Allocate the native object on the C++ Heap via a constructor
            CGCL_MAN() : m_pGCL( new CGCL ) {}

            // Deallocate the native object on a destructor
            ~CGCL_MAN() {
              delete m_pGCL;
            }

        protected:
            // Deallocate the native object on the finalizer just in case no destructor is called
            !CGCL_MAN() {
                delete m_pGCL;
            }

        public:
            void Clear() {
                return m_pGCL->Clear();
            }

        private:
            CGCL * m_pGCL;
      };
  }

  STATUS GetListOfDevProperties(CDeviceObjectPropertyReferenceList &DevicePropertyList) const;

#pragma once

#include "cdoprl.h"

using namespace System;

namespace ThirdParty_DOPRL
{
    public ref class CDOPRL_MAN
    {
    public:
        // Allocate the native object on the C++ Heap via a constructor
        CDOPRL_MAN() : m_pDevObjPropRefList(new CDeviceObjectPropertyReferenceList) {}

        // Deallocate the native object on a destructor
        ~CDOPRL_MAN() {
            delete m_pDevObjPropRefList;
        }

    protected:
        // Deallocate the native object on the finalizer just in case no destructor is called
        !CDOPRL_MAN() {
            delete m_pDevObjPropRefList;
        }

    public:
        bool IsEmpty() {
            return m_pDevObjPropRefList->empty();
        }

        void Clear() {
            return m_pDevObjPropRefList->clear();
        }

        size_t Size() {
            return m_pDevObjPropRefList->size();
        }

    private:
        CDeviceObjectPropertyReferenceList * m_pDevObjPropRefList;
    };
}

            STATUS GetListOfDevProperties(CDOPRL_MAN devPropList) {
                return m_pGCL->GetListOfDevProperties(devPropList);
            }

但是，当然，VS警告我，在上面的返回语句中提到devPropList是无效的（“简单的非跟踪引用不能绑定到托管堆上的实体”）——简单来说，这意味着我非法混合了对非托管类和托管类的引用

简而言之，有没有一种方式可以在原来的C++ DLL？

所要求的托管CoprrLHman类类型与非托管CdVice对象属性的引用类型之间转换？

---

希望我提供了足够的信息。

您是否错过了符号？它在第一个例子中，而不是在第二个例子中。谢谢，但没有乐趣。我不擅长C++，我尝试了所有的参数组合，在声明和返回语句中都预先设置了参数，所有这些都与标记无效。我认为问题是变量位于哪里。变量不能在C++执行堆栈上（参数列表或返回对象）。变量必须在全局内存中。本条可能会中止：