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。该my.dll .NET项目链接到一个本地C ++ DLL（mynat.dll）（外部C DLL接口）并调用从C＃到C ++ DLL工作没有问题。 （通过使用函数[DllImport（mynat.dll，字符集= CharSet.Unicode，CallingConvention = CallingConvention.Cdecl）] 属性。）

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. )

我需要什么，现在补充的是为C＃DLL提供一些回调函数的C ++代码可以调用。理想情况下，mynat.dll C ++代码将使用调用LoadLibrary（my.dll）来加载C＃DLL，然后使用GetProcAddress的解决回调函数，然后它可以调用。 （请注意，在C ++代码调用LoadLibrary点的my.dll C＃DLL已加载到进程 - 这一呼吁也只是得到一个句柄DLL。）

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.)

不过，我不知道正确的方法是从一个.NET的DLL导出一个外部C DLL接口是什么

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

我需要做什么做实现这一目标？

What do I need to do to achieve this?

推荐答案

虽然的按SLaks提供非托管Exportsutility链接可能会或可能无法正常工作，我们使用了一个类似的工具（从不同的来源），这里因问题签名的可执行程序有。放弃了这种做法。

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.

的正确方法使.NET回调可用于纯本机模块是写一个C ++ / CLR项目，做了向上调用到.NET程序集和导出原生界面。

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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