包装C＃C ++ [英] Wrapping C# C++

问题描述

我想换用C ++ / CLI本机库。这是一个与原始类型的工作。但是，在以下情况下，它更复杂的：

I would like to wrap a native library with C++/CLI. It's work with primitive type. But in the following case, it's more complicated :

interface ISampleInterface
{
    void SampleMethod();
}

public ref class NativeClassWrapper {
    NativeClass* m_nativeClass;

public:
    NativeClassWrapper() { m_nativeClass = new NativeClass(); }
    ~NativeClassWrapper() { delete m_nativeClass; }
    void Method(ISampleInterface ^i) {
        ???
        m_nativeClass->Method(i);
    }
};

如何来包装呢？由于本机code C ++不知道ISampleInterface类型...（同样的问题与虚拟类）

How to wrap this ? Because the native code C++ doesn't know the ISampleInterface type... (Same question with a virtual class)

谢谢你。

推荐答案

有在code段一些错误。让我们先从一个干净的例子，首先声明的本机类：

There are some mistakes in the code snippet. Let's start with a clean example, declaring the native class first:

#pragma unmanaged
class INativeInterface {
public:
    virtual void SampleMethod() = 0;
};

class NativeClass {
public:
    void Method(INativeInterface* arg);
};

和被管理的接口：

#pragma managed
public interface class IManagedInterface
{
    void SampleMethod();
};

所以，你需要的是一个派生自INativeInterface本地包装类，这样就可以通过它的一个实例来NativeClass ::方法（）。所有这包装所要做的就是简单地委托调用相应的管理接口方法。通常需要一个简单的一行，除非参数类型转换。像这样的：

So what you need is a native wrapper class that derives from INativeInterface so that you can pass an instance of it to NativeClass::Method(). All that this wrapper has to do is simply delegate the call to the corresponding managed interface method. Usually a simple one-liner unless argument types need to be converted. Like this:

#pragma managed
#include <msclr\gcroot.h>

class NativeInterfaceWrapper : public INativeInterface {
    msclr::gcroot<IManagedInterface^> itf;
public:
    NativeInterfaceWrapper(IManagedInterface^ arg) : itf(arg) {};
    virtual void SampleMethod() {
        itf->SampleMethod();
    }
};

现在你的方法实现变得简单：

Now your method implementation becomes easy:

void Method(IManagedInterface^ i) {
    NativeInterfaceWrapper wrap(i);
    m_nativeClass->Method(&wrap);
}

这篇关于包装C＃C ++的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！