如何使用现有的 C++ .NET 中的代码 (C#)
我想创建一个 C# 项目并实现现有的本机 (C++) 代码。 有谁知道有关它的任何好的教程吗？
谢谢！
I would like to create a C# project and implement the existing native (C++) code. Does anyone know about any good tutorial about it?
Thanks!
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您可以使用 P/Invoke，并且可以调用非托管方法。
我将向您发布一些示例：
此是对 MSDN 官方文档的引用。
这是一个社区维护的网站，其中包含大多数常见的 Windows 非托管库以及方法签名和示例
You can use P/Invoke and you can call unmanaged methods.
I'll post you some examples:
This is a reference to MSDN official documentation.
This is a community mantained website with most of the common Windows unmanaged libraries along with method signatures and examples
如果您的 C++ 代码是托管的（如您所说），那么我建议您将其保留为 C++，除非您有充分的理由——未来的 C#（等）程序集应该能够仅“按原样”引用它。
If your C++ code is managed (as you say), then I'd suggest that you leave it as C++ unless you have a very good reason to -- future C# (etc.) assemblies should be able to just reference it 'as is'.
我假设“实现现有代码”意味着您希望从 C# 调用它，并对 C++ 代码进行最少的更改。
我是 C++/CLI in Action 这本书的粉丝和最近购买者，其中有一些内容在线有用的示例章节。
CodeProject 简介是一个很好的起点。
《C++/CLI in Action》的作者在 CodeProject 上发表了许多文章，请向下滚动到 他的索引。
关于 P/Invoke 的维基百科文章有很多原因说明您可能不想使用它方法，我同意：
MSDN 上的最佳起点是 摘要文章。
I assume by implement the existing code you mean you want to call it from C#, with minimal changes to the C++ code.
I'm a fan and recent purchaser of the book C++/CLI in Action which has a couple of useful sample chapters online.
This intro on CodeProject is a good starting point.
The author of C++/CLI in Action has a number of articles on CodeProject, scroll down to the C++/CLI section on his index.
The Wikipedia article on P/Invoke has a number of reasons why you might not want to use that approach, with which I agree:
The best starting point on MSDN is the summary article.
为什么不尝试为您的 C++ 代码使用托管包装器。
http://msdn .microsoft.com/library/default.asp?url=/library/en-us/vcmxspec/html/vcmg_accessingcodefromframeworkobjects.asp
Why don't you try managed wrappers for your C++ code.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcmxspec/html/vcmg_accessingcodefromframeworkobjects.asp
最简单的方法可能是创建一个 C++/CLI 项目，这将使您能够混合托管和非托管 C++。 然后，您可以使用 C# 代码可以直接调用的托管 .Net 包装器来包装现有的非托管 C++ 类。 MSDN 杂志有一篇关于 C++/CLI 的很好的介绍性文章。
互操作仅对调用 C 风格函数真正有用。 您不能真正使用它与纯 C++ 类交互。
Probably the easiest way to do this is to create a C++/CLI project, which will enable you to mix managed and unmanaged C++. You can then wrap your existing unmanaged C++ classes with a managed .Net wrapper that your C# code can call directly. MSDN magazine has a good introductory article on C++/CLI.
Interop will only really be useful for calling C-style functions. You can't really use it to interact with pure C++ classes.
我通过实践学到了这一点，所以我没有一个好的教程，但有几件事您需要注意 - 托管 C++ 和 C++/CLI 都与非托管代码集成，几乎没有丑陋的接缝。 C# 的情况并非如此。 在托管 C++ 中，很可能会执行这样的操作：
而在 C# 中，您必须 P/Invoke 到 SetWindowText 中，但实际上并非如此：这只是一个简单的示例，但您需要注意托管 C++ 编译器是一种奇怪的组合，既透明地为您执行大量互操作，同时又不为您执行任何操作（即，它不会执行隐式编组）。
I learned this by doing it, so I don't have a good tutorial, but there are a couple things you need to be aware of - managed C++ and C++/CLI both integrate with unmanaged code with very few ugly seams. This is not the case with C#. In managed C++, it's quite possible to do something like this:
whereas in C# you would have to P/Invoke into SetWindowText--not that you really would: it's just a simple example, but you need to be aware that the managed C++ compiler is a weird combination of doing a lot of interop for you transparently and doing nothing for you at the same time (ie, it will do no implicit marashalling).