使用MarshalAs进行P/调用签名的F#语法 [英] F# syntax for P/Invoke signature using MarshalAs

问题描述

我不确定此语法.我正在尝试将此C#代码转换为F#.

I'm unsure of the syntax for this. I'm trying to translate this C# code into F#.

struct LASTINPUTINFO
{
    public uint cbSize;
    public uint dwTime;
}

public class IdleTimer
{
    [DllImport("User32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);
}

这是我到目前为止所拥有的.

This is what I have so far.

type LASTINPUTINFO = {
    cbSize : UInt32;
    dwTime : UInt32;
}

type IdleTimer =
    [<DllImport("User32.dll")>]
    [<return: MarshalAs(UnmanagedType.Bool)>]
    extern GetLastInputInfo(plii : LASTINPUTINFO ref)

推荐答案

除了Brian的评论外，值得指出的是，F#extern签名相当忠实地反映了C签名，因此不要在其上使用[<In>][<Out>]属性引用，您可能只需将参数声明为LASTINPUTINFO* plii，然后使用&&将引用传递给本地实例调用该函数时的操作符.

In addition to Brian's comment, it may be worth pointing out that F# extern signatures reflect C signatures fairly faithfully, so that rather than using the [<In>][<Out>] attributes on the reference you can probably just declare the parameter as LASTINPUTINFO* plii, and then pass a reference to a local instance using the && operator when calling the function.

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