调用从非托管C ++ C＃的功能（通过托管包装） [英] Calling a C# function from unmanaged c++ (via a managed wrapper)

问题描述

我有C ++源&放大器;标头一组，我需要从C＃应用程序调用的库。我创建围绕我需要和我能够从C＃调用它们向后和向前编组的数据功能的托管C ++包装。

现在最困难的部分。<因为它运行，我希望能够从调用C＃应用程序中显示这些/ p>

我的非托管C ++库生成状态消息。我目前的想法是这样的：

我想非托管C ++库代码来调用我的C＃代码的函数，我传递给托管包装，因为我创造它。我发现一些教程代码项目，但语法似乎是过时了。

如果任何人有一些示例代码或可能指向我的方向很好的教程，这将是巨大的。

在事先的任何帮助感谢。

解决方案

您可以通过一个.NET委托到C ++ / CLI函数，它指向一个功能是匹配的论点。

注意事项

1. 的指针到函数必须STDCALL调用约定


2. 如果委托是一个对象的成员，这个函数指针不会算作一个参考，以保持对象存活。你必须在时间内保持对对象的引用回调举行

既然你认为你的例子是过时的，我会假设你正在使用C ++ / CLI的新语法。这里是一个CodeProject上对如何做到这一点。

的 http://www.codeproject.com/KB/mcpp/FuncPtrDelegate.aspx

I have C++ source & headers for a set of libraries which I need to call from a C# application. I've created a managed C++ wrapper around the functions I need and am able to call them from C# marshalling the data backwards and forwards.

Now the hard part..

My unmanaged C++ library generates status messages as it runs and I'd like to be able to display these from the calling C# application. My current thinking goes like this:

I'd like the unmanaged C++ library code to call a function in my C# code that I pass to the managed wrapper as I create it. I've found a few tutorials on Code Project but the syntax seem to be out of date.

If anyone has some sample code or could point me in the direction of a good tutorial that would be great.

Thanks in advance for any help.

解决方案

You can pass a .NET delegate to a C++/CLI function that takes a pointer to a function with "matching" arguments.

Caveats

1. The pointer-to-function must be STDCALL calling conventions
2. If the delegate is a member of an object, this pointer to function will not count as a reference to keep the object alive. You have to maintain a reference to the object during the time that the callback is held

Since you think your examples are out of date, I am going to assume you are using the new syntax of C++/CLI. Here is a CodeProject with an example of how to do that

http://www.codeproject.com/KB/mcpp/FuncPtrDelegate.aspx

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