blocks|key|1877090|text|在.NET中定义委托，然后将其传递给非托管代码。CLR将把委托公开为函数指针，您可以从非托管代码中调用该指针。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1877091|互操作层不知道如何处理C%2B%2B中的引用。因此，您需要将对象公开为指针，而不是引用。此外，.NET不知道C%2B%2B对象是什么(它与System.Object不同)。这将需要作为IntPtr传递，我不认为在.NET中可以对它做太多事情。|1877092|C%2B%2B回调：|1877093|typedef+void+(*CBFUNC1)(unsigned+int,+const+char*,+object&);
typedef+object*+(*CBFUNC2)(object*,+struct+_mystruct*+);|code-block|syntax|javascript|1877094|代表的C#签名将是|1877095|delegate+void+CbFunc1(uint+param1,+[MarshalAs(UnmanagedType.LPStr)]+string
param2,+IntPtr+param3);
delegate+IntPtr+CbFunc2(IntPtr+param1,+ref+_mystruct+param2);|1877096|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|T|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|V|8|@]|9|@]|A|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Define a delegate in .NET, and then pass that to your unmanaged code. The CLR will expose the delegate as a function pointer which you can call from your unmanaged code.

The interop layer does not know how to handle references in C++. So You need to expose the object as a pointer, not a reference. Additionally, .NET doesn't know what a C++
object is (it's not the same as System.Object). That will need to be passed
as an IntPtr, and I don't think there is much you can do with it in .NET.

C++ callbacks:

<pre><code>typedef void (*CBFUNC1)(unsigned int, const char*, object&amp;);
typedef object* (*CBFUNC2)(object*, struct _mystruct* );
</code></pre>

C# signatures for the delegates would be

<pre><code>delegate void CbFunc1(uint param1, [MarshalAs(UnmanagedType.LPStr)] string
param2, IntPtr param3);
delegate IntPtr CbFunc2(IntPtr param1, ref _mystruct param2);
</code></pre>

blocks|key|5287267|text|一种选择是使用C%2B%2B/CLI调入C#代码。如果您的C%2B%2B代码必须保持非托管(本机)状态，那么您应该将C#代码包装在COM组件中，并在C%2B%2B代码中使用它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5287268|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

One option you have is to use C++/CLI to call into the C# code. If your C++ code must stay unmanaged (native), then you should wrap your C# code in a COM component and use it from your C++ code.

blocks|key|856202|text|这显然是可以做到的--所有CLR主机从一开始就是本机应用程序。您的选择：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|856203|托管应用程序中的|856204|调用本机DLL+(PInvoke)|unordered-list-item|856205|调用托管COM对象(以Dan+suggested)|856206|host+CLR自己的身份-+sample|offset|length|856207|856208|entityMap|0|LINK|mutability|MUTABLE|url|http://www.codeproject.com/Articles/1481/Creating-a-host-application-for-the-NET-Common-Lan^0|0|0|0|0|F|6|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|X|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|Z|8|@]|9|@$K|10|L|11|1|12]]|A|$]]|$1|M|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]]]

This obviously can be done - all CLR hosts are native applications to start with. Your options:

<ul>
<li>in managed application call your native DLL (PInvoke)</li>
<li>call managed COM object (as Dan suggested)</li>
<li>host CLR yourself - <a href="http://www.codeproject.com/Articles/1481/Creating-a-host-application-for-the-NET-Common-Lan" rel="nofollow">sample</a></li>
</ul>

blocks|key|5287385|text|您正在寻找Marshal.GetFunctionPointerForDelegate()。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5287386|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.marshal.getfunctionpointerfordelegate.aspx^0|5|13|5|13|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

You are looking for <a href="http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.marshal.getfunctionpointerfordelegate.aspx" rel="nofollow"><code>Marshal.GetFunctionPointerForDelegate()</code></a>.

blocks|key|855414|text|Rohit的答案是正确的，但根据你是立即回调(C#调用C%2B%2B，后者回调C#)还是想重复回调(C#调用C%2B%2B，并在一次或多次之后将回调返回给C#)，路径上有更多的陷阱。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|855415|我从Unity/C#和C/C%2B%2B/Objective-C互操作的角度编写了this+example，但是无论您在哪里进行C#/C互操作，您都会发现其中的一些注释和代码片段很有用。|855416|特别是，如果C/非托管代码可能在不同的时间回调，请确保正确地保留/持有从C#/托管代码传递到C/非托管代码的任何委托。|855417|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/users/1155650/rohit|1|https://github.com/natbro/UnityPlugin^0|0|5|0|0|11|C|1|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]]]

<a href="https://stackoverflow.com/users/1155650/rohit">Rohit</a>'s answer is right, but there are lots more gotcha's on the path depending on whether you're calling back immediately (C# calls C++ which calls back C#) or if you want to call back repeatedly (C# calls C++ and after returning calls back one or more times later to C#).

i wrote <a href="https://github.com/natbro/UnityPlugin" rel="nofollow noreferrer">this example</a> from the perspective of Unity/C# and C/C++/Objective-C interop, but you may find some of the comments and code-snippets useful no matter where you are doing C#/C interop.

in particular make sure that you're propertly retaining/holding any delegates you pass from C#/managed to C/unmanaged code if the C/unmanaged code might be calling back at a different time.

In Mono you can pass a delegate from C# to a C++ function which takes in the delegate as a function pointer. Can this be done in C# on Windows for example where you can compile a native C++ unmanaged library, link it against a C# project and get a C++ function to invoke a C# function via a function pointer which C# passed to it as a delegate?

Calling C# code from unmanaged C++?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在Mono中，您可以将委托从C#传递给C++函数，该函数接受委托作为函数指针。例如，在Windows上的C#中，您可以编译本机C++非托管库，将其链接到C#项目中，并通过C#作为委托传递给它的函数指针来获取C++函数来调用C#函数。

问从非托管C++调用C#代码？
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