structure in .NET

Posted by redpaladin on Stack Overflow See other posts from Stack Overflow or by redpaladin
Published on 2010-03-11T19:51:20Z Indexed on 2010/03/11 19:54 UTC
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struct

|

interop

My problem is very simple.. My problem is to send a structure beetween a program in C to a C# program..

I made a struct in C#:

public struct NetPoint { 
    public float lat; // 4 bytes
    public float lon; // 4 bytes
    public int alt; // 4 bytes
    public long time; // 8 bytes
}

Total size of the struct must be 20 bytes

When i do a sizeof() of this struct

System.Diagnostics.Debug.WriteLine("SizeOf(NetPoint)=" + System.Runtime.InteropServices.Marshal.SizeOf(new NetPoint()));

The debug console show : SizeOf(NetPoint)=24

But i expected to have 20 bytes ? Why do I have a difference ?

Thank you in advance

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