开发者

Casting an Integer to a Single, preserving bit representation

开发者 https://www.devze.com 2023-03-15 02:21 出处:网络
Is there a fast way in VB.NET to take a 32-bit int and cast to a 32-b开发者_StackOverflow社区it float while preserving the underlying bit structure?BitConverter will do this, but I\'d like to cast it

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


Damn, how could I possibly forget about The C-style Union?

<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

Well, how about writing a helper function in C# similar to one shown here:

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

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

0

精彩评论

暂无评论...
验证码 换一张
取 消