本文介绍了在C ++ / CLI中包装C回调的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我有一个静态C库,其中有非静态回调函数。注册此回调的客户端程序从摄像机获取视频数据。

I have a static C library where I have non static call back function. The Client program that register this callback gets Video data from camera .

现在,我正在C ++ / CLI中为此编写Wrapper( DLL )。该包装器Dll将用在C#应用程序中。

Now I am writing Wrapper(DLL) for this in C++/CLI.This Wrapper Dll will be used in C# application.

如何在C ++ / CLI中实现回调,以便C#代码可以注册该回调并从中获取视频数据。 / p>

How to Implement the callback in C++/CLI so that C# code can register it and gets the video data from it.

推荐答案

在C ++ / CLI中,您可以具有静态函数(带有本机C签名,可以用作C库的回调) ),调用托管代表:

In C++/CLI, you can have static functions (with native C signature, which can work as a callback from a C library), calling managed delegates:

// MyDispatcherClass.h
#pragma once

public delegate void MyDelegateType();

public ref class MyDispatcherClass
{
public:
    static MyDelegateType^ MyDelegate;
};

static void MyCallback(/*...*/)
{
    if (MyDispatcherClass::MyDelegate != nullptr)
        MyDispatcherClass::MyDelegate(/* do some type mapping here if needed */);
}


// MyDispatcherClass.cpp:
#include "stdafx.h"
#include "MyDispatcherClass.h"

因此在C库中注册 MyCallback ,将C#委托注册为 MyDispatcherClass :: MyDelegate 完成。

So register MyCallback at your C library, register your C# delegate to MyDispatcherClass::MyDelegate and you are done.

这篇关于在C ++ / CLI中包装C回调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!

08-20 01:09