如何从本机C（++）DLL调用.NET（C＃）代码？ [英] How to call .NET (C#) code from a native C(++) DLL?

问题描述

我有一个C＃app.exe和一个C＃my.dll。 my.dll .NET项目链接到本地​​C ++ DLL（mynat.dll）（extern C DLL接口），并从C＃调用到C ++ DLL工程没有问题。 （使用 [DllImport（mynat.dll，CharSet = CharSet.Unicode，CallingConvention = CallingConvention.Cdecl）] 属性。）

我现在需要添加的是C＃dll提供一些C ++代码可以调用的回调函数。理想情况下，mynat.dll C ++代码将使用LoadLibrary（my.dll）加载C＃dll，然后使用GetProcAddress来解析它可以调用的回调函数。 （注意，在C ++代码调用LoadLibrary的时候，my.dll C＃dll已经加载到进程中 - 这个调用只是获取dll的句柄。）

但是，我不知道正确的方法是从.NET DLL导出extern C DLL接口

我需要做什么 首页/上传/ unmanagedexportsrel =nofollow>链接提供的SLaks 到非管理Exportsutility可能或可能不工作，我们在这里使用类似的工具（从不同的来源）和由于签名的可执行文件的问题有放弃了这种方法。

我们总结了以下内容，并将在未来这样做：

使.NET回调可用于纯本地模块是编写一个C ++ / CLR项目，将上传到.NET汇编并导出一个本地接口。

  [.NET]  - > -----------  - > [C（++）] ...通过DllImport属性
 
 [.NET] < -  [C ++ / CLR] < -  [C（++）] ... NET接口+默认本地接口
  

I have a C# app.exe and one C# my.dll. The my.dll .NET project links to a native C++ DLL (mynat.dll) (extern C DLL interface) and calling from C# into the C++ DLL works without problems. ( By using the [DllImport("mynat.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)] attribute. )

What I need to add now is for the C# dll to provide some callback functions that the C++ code can call into. Ideally the mynat.dll C++ code would use LoadLibrary("my.dll") to load the C# dll and then use GetProcAddress to resolve a callback function it can then call. (Note that at the point the C++ code calls LoadLibrary the my.dll C# dll is already loaded into the process - this call would just be to get a handle to the dll.)

However, I don't know what the correct way is to export an "extern C DLL interface" from a .NET DLL

What do I need to do to achieve this?

解决方案

While the link provided by SLaks to the Unmanaged Exportsutility might or might not work, we used a similar tool (from a different source) here and due to problems with signed executables have abandoned this approach.

We have concluded the following and will do this in the future:

The correct way to make .NET callbacks available to pure native modules is to write a C++/CLR project that does the upcalls to to .NET assembly and exports a native interface.

[ .NET ] -> ----------- -> [ C(++) ]  ... via DllImport Attribute

[ .NET ] <- [ C++/CLR ] <- [ C(++) ]  ... "default" .NET interface + "default" native interface

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