如何在C#应用程序和C ++ dll之间相互调用对象的接口类 [英] how to inter call object's interface class between C# app and C++dll

问题描述

在我的c ++ dll中执行以下操作:

我的dll头文件(例如:test.h):

(1)定义一个回调接口类:

class CClassCallback
{
public:
   virtual HRESULT OnAdded() = 0;
   virtual HRESULT OnDeled() = 0;
   virtual HRESULT OnFailed() = 0;
};

(2)这样的结构:

struct SAType
{
  CString         strTest;
  int             nTest;
  CClassCallback* pClassCallback;
};

(3)对象接口类，例如:

class CTestInterface
{
public:
	virtual HRESULT Test1(SAType* pTest) = 0;
	virtual HRESULT Test2() = 0;
	virtual void Release() = 0;
};

(4)唯一的导出dll功能:

__declspec(dllexport) CTestInterface* ConstructInterface();

我的dll cppfile(例如:test.cpp):

(1)从CTestInterface派生一个类

class CTestObject:public CTestInterface
{
public:
	HRESULT Test1(SAtype& Test) 
	{
		m_sType = Test;
	}
	HRESULT Test2()
	{
		
	}
	void Release()
	{
		delete this; //delete this object
	}
private:
	void InnerDemoFuc()
	{
		if(true)
		{
//in some condition callback the app by a callback object
			m_sType.pClassCallback->OnAdded();
		}
	}
	SAtype m_sType;
}

(2)构造一个对象并返回其接口:

CTestInterface* ConstructInterface()
{
    return new CTestObject();
}

dll没关系.(实际代码更复杂)

当我在MFC UI APP中使用我的dll时，如下所示:
(1)从CClassCallback派生一个类:

class CClassCallbackEx : public CClassCallback
{
public:
	CClassCallbackEx();
	
	virtual HRESULT OnAdded()
	{
		.....//do UI app job independly from dll..
	}
	virtual HRESULT OnDeled()
	{
	}
	virtual HRESULT OnFailed()
	{
	}

// can add other func ,var for app needs.
}

(2)像这样使用dll:

//construct a dll''s object,and get its interface
        CTestInterface* m_pInterface = ConstructInterface(); 
 	SAType sAtype;
//new a callback object 
	sAtype->pClassCallback = new CClassCallbackEx();
	m_pInterface->Test1(sAtype);
			
.......

// all are ok ,delete the ojbject through interface
	m_pInterface->Relese();				
	m_pInterface=NULL;	
  	
       delete (CClassCallbackEx)sAtype->pClassCallback ;

好吧.
但是当我想在C#+ .net UI应用程序中使用我的dll时，会出现一些问题:
(1)我无法获取CTestObject实例的接口的成员函数，
由于接口类未导出.我尝试获取对象的虚拟功能表失败.
(2)我必须使用C#代码从C ++接口派生一个类，并在C ++ dll中使用，这意味着ojbect回调，而不是funccallback(OOP)
我不知道该怎么办.

换句话说:
(1)C#通过virture类使用C ++ Dll对象
(2)C ++ dll通过虚拟类使用C#对象

给我一些建议，请给我一些建议.

我建​​议将托管C ++用作本地C ++库的包装器".以后，您可以根据需要在C#(VB)代码中使用它.

In a my c++ dll do like this:

my dll headerfile(eg:test.h):

(1) define a callback interface class:

class CClassCallback
{
public:
   virtual HRESULT OnAdded() = 0;
   virtual HRESULT OnDeled() = 0;
   virtual HRESULT OnFailed() = 0;
};

(2) a struct like this:

struct SAType
{
  CString         strTest;
  int             nTest;
  CClassCallback* pClassCallback;
};

(3)a object interface class like:

class CTestInterface
{
public:
	virtual HRESULT Test1(SAType* pTest) = 0;
	virtual HRESULT Test2() = 0;
	virtual void Release() = 0;
};

(4) the only export dll function:

__declspec(dllexport) CTestInterface* ConstructInterface();

my dll cppfile(eg:test.cpp):

(1) derived a class from CTestInterface

class CTestObject:public CTestInterface
{
public:
	HRESULT Test1(SAtype& Test) 
	{
		m_sType = Test;
	}
	HRESULT Test2()
	{
		
	}
	void Release()
	{
		delete this; //delete this object
	}
private:
	void InnerDemoFuc()
	{
		if(true)
		{
//in some condition callback the app by a callback object
			m_sType.pClassCallback->OnAdded();
		}
	}
	SAtype m_sType;
}

(2) construct a object and return its interface:

CTestInterface* ConstructInterface()
{
    return new CTestObject();
}

that''s ok for dll.(real code is more complex)

when I use my dll in MFC UI APP like this:
(1) derive a class from CClassCallback:

class CClassCallbackEx : public CClassCallback
{
public:
	CClassCallbackEx();
	
	virtual HRESULT OnAdded()
	{
		.....//do UI app job independly from dll..
	}
	virtual HRESULT OnDeled()
	{
	}
	virtual HRESULT OnFailed()
	{
	}

// can add other func ,var for app needs.
}

(2) Use the dll like this:

//construct a dll''s object,and get its interface
        CTestInterface* m_pInterface = ConstructInterface(); 
 	SAType sAtype;
//new a callback object 
	sAtype->pClassCallback = new CClassCallbackEx();
	m_pInterface->Test1(sAtype);
			
.......

// all are ok ,delete the ojbject through interface
	m_pInterface->Relese();				
	m_pInterface=NULL;	
  	
       delete (CClassCallbackEx)sAtype->pClassCallback ;

run ok.
but when i want use my dll in c# + .net UI app,some questions:
(1) i cannot get the CTestObject instance''s interface''s member function,
because the interface class is not export.i try to get the object''s virture function table,failed.
(2) i have to derive a class from c++ interface in c# code, and use in C++dll, means ojbect callback, not funccallback (OOP)
i donot know how to do.

other words:
(1) C# use a C++Dll ojbect through virture class
(2) C++dll use a C# object through virture class

Give me some suggestions,pls

解决方案

I would suggest usage of managed C++ as a "wrapper" around the native C++ library. Later you can consume it in your C# (VB) code as you want.

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