在C＃中使用C ++ DLL中的导出类 [英] Using an exported class from a C++ DLL in C#

问题描述

大家好，



我想在c＃winform应用程序中使用c ++ dll



Dll导出一个继承自另一个基类的类（CMyClass）。



导出由包装器完成，该包装器以这种方式封装CTor DTor和另一个函数：



externC{

extern __declspec（dllexport）CMyClass * CreateMyClass（）;

.DTor ..

。功能..

}



和CreateMyClass是这样的：





CMyClass * CreateMyClass（）{return new CMyClass（）;}





在c＃中调用CreateMyClass是通过声明

[DllImport（MyDllPath .....）]

static public extern IntPtr CreateMyClass（）;



然后调用IntPtr p = CreateMyClass（）。



调用失败试图读取或写入受保护的内存



是否有可能le调用一个c ++类，它是c＃中的派生类？



谢谢!!



< b>我尝试了什么：



这个dll在另一个C ++应用程序中工作正常。



C＃app。如果CMyClass不是派生类，则成功调用CreateMyClass

解决方案

简而言之：在类中编写COM包装器。



您可以使用编组或 C ++ COM Interop 执行此操作，如下所述微软。这是一篇如何制作C ++类的文章，其中包含一个演示项目

Hi all,

I am trying to use a c++ dll in c# winform application

The Dll exports a class (CMyClass) which inherits from another base class.

The export is done by a wrapper which encapsulates the CTor DTor and another function in this manner:

extern "C" {
extern __declspec(dllexport) CMyClass* CreateMyClass();
.DTor..
.function..
}

and CreateMyClass is something like that:


CMyClass* CreateMyClass (){return new CMyClass();}


The call to CreateMyClass in c# is done by declaring
[DllImport("MyDllPath.....")]
static public extern IntPtr CreateMyClass ();

and then calling IntPtr p = CreateMyClass() .

The call fails with Attempted to read or write protected memory"

Is it possible to invoke a c++ class which is a derived class in c#?

Thanks!!

What I have tried:

The dll works fine in an another C++ app.

The C# app. succeeded in calling the CreateMyClass if CMyClass is not a derived class

解决方案

In a nutshell: write a COM wrapper around the class.

You can do this with Marshalling or C++ COM Interop as described by Microsoft. Here is an article How to Marshal a C++ Class which has a demo project included.

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