Casting an Integer to a Single, preserving bit representation
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.
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