如何从C#导入和使用非托管C ++类? [英] How to import and use a unmanaged C++ class from C#?
问题描述
我有一个原生的C ++ DLL,一些头文件和导入库。是否有一种方法如何实例化在dll中定义的C#中的对象?
I have an native C++ dll, some header files and the import library. Is there a way how to instantiate an object within C# that is defined in the dll?
我知道的两种方式是:
- 将C ++代码封装到COM
- 中以使用DLLImport和外部C函数
推荐答案
C ++ / CLI是您的朋友。你会遇到一个问题,虽然:不可能存储标准C ++对象在C ++ / CLI ref或值类(.NET中的)。所以你必须使用我在生产代码中使用的下面的类(你可以修改):
C++/CLI is your friend for this. You'll run into one problem though: it is not possible to store standard C++ objects inside C++/CLI ref or value classes (the ones for .NET). So you'll have to resort to the following class (that you can modify) that I use in production code:
#pragma once
#include <boost/shared_ptr.hpp>
template <typename T>
ref class Handle
{
boost::shared_ptr<T>* t;
!Handle()
{
if (t != nullptr)
{
delete t;
t = nullptr;
}
}
~Handle() { this->!Handle(); }
public:
Handle() : t(new boost::shared_ptr<T>((T*)0)) {}
Handle% operator=(T* p)
{
if (p != t->get()) t->reset(p);
return *this;
}
static T* operator&(Handle% h) { return h.t->get(); }
static boost::shared_ptr<T> operator->(Handle% h) { return *h.t; }
T& reference() { return *t->get(); }
T const& const_reference() { return *t->get(); }
};
用法: Handle< MyCppClass> ^ handle;
在C ++ / CLI类中。然后实现stub方法,将它们转发到句柄
成员。垃圾收集的对象将调用C ++类实例的析构函数,如果没有更多的指针:
Usage: Handle<MyCppClass>^ handle;
inside a C++/CLI class. You then implement stub methods, forwarding them to the handle
member. Garbage collected objects will call destructors of the C++ class instance iff there is no more pointer to it:
public ref class Foo
{
void bar() { handle->bar(); }
internal:
Handle<CppNamespace::Foo>^ handle;
};
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