How do I copy bytes into a struct variable in C#?

Question

I have a struct abc and I want to copy bytes into a struct variable. Similar to memcpy in C/C++. I receive the bytes over socket and they are the bytes of the same struct abc variable.

[StructLayout(LayoutKind.Sequential, Pack = 1)]    
public struct abc
{ 
         public int a;
         public int b;
         public float c;
         public char[] d; //30 size
}

Answer 1

You can convert the byte array to your structure as follows :

            int size = Marshal.SizeOf(typeof(abc));
            IntPtr ptr = Marshal.AllocHGlobal(size);

            Marshal.Copy(arr, 0, ptr, size);

            var struct = (abc)Marshal.PtrToStructure(ptr, typeof(abc));
            Marshal.FreeHGlobal(ptr);

struct is now your converted structure. Bear in mind the comments that have been made about this though (i.e. byte ordering)