如何将 out/ref extern 参数转换为 F#

问题描述

我有一个像这样的 C# extern 声明:

I've got a C# extern declaration that goes like this:

    [DllImport("something.dll")]
    public static extern ReturnCode GetParent(IntPtr inRef, out IntPtr outParentRef);

如何将其翻译成 F#?

How to translate that to F#?

推荐答案

您可以尝试类似下面的代码.我不知道 ReturnCode 是什么，所以下面的代码期望它是一个整数.对于任何更复杂的类型，您需要使用 [] 属性，如 A-Dubb 引用的答案中所述.

You can try something like the code below. I don't know what ReturnCode is, so the code below expects it is an integer. For any more complex type, you'll need to use [<Struct>] attribute as in the answer referenced by A-Dubb.

type ReturnCode = int

[<System.Runtime.InteropServices.DllImport("something.dll")>]
extern ReturnCode GetParent(System.IntPtr inRef, System.IntPtr& outParentRef);

要调用该函数，您可以这样写:

To call the function, you'd write something like this:

let mutable v = nativeint 10
let n = GetParent(nativeint 0, &v)

顺便说一句:您能否也发布一个示例 C 代码来实现 something.dll 中的功能?如果是，我们可以在发送答案之前尝试运行该解决方案...

BTW: Could you also post a sample C code that implements the function in something.dll? If yes, we could try running the solution before sending an answer...

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