将整数转换为单个，保留位表示 [英] Casting an Integer to a Single, preserving bit representation

问题描述

在VB.NET中有一种快速的方法来获取32位int并转换为32位浮点数，同时保留底层位结构？ BitConverter会做到这一点，但是我想直接转换它而不涉及字节数组。

Is there a fast way in VB.NET to take a 32-bit int and cast to a 32-bit float while preserving the underlying bit structure? BitConverter will do this, but I'd like to cast it directly without involving byte arrays.

推荐答案

忘记C风格联盟？

<Runtime.InteropServices.StructLayout(Runtime.InteropServices.LayoutKind.Explicit)> _
Public Structure IntFloatUnion
    <Runtime.InteropServices.FieldOffset(0)> Public i As Integer
    <Runtime.InteropServices.FieldOffset(0)> Public f As Single
End Structure


Sub Main()
    Dim u As IntFloatUnion

    u.i = 42
    Console.WriteLine(u.f)

    Console.ReadLine()
End Sub

---

那么，如何在C＃中编写一个类似于此处：

public static class FancyConverter
{
    public static unsafe float FloatFromBytes(int i)
    {
        return *((float*)(void*)(&i));
    }
}

这可以编译为单独的dll， VB项目。

This can be compiled to a separate dll and referenced from the VB project.

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