Converting a structure to a byte array

Thanks Alan works fine.

In the structure I did need to use the Pack =1 attribute as for unpacking it's going to a program written in C++ but thanks for the info.

No, it's not exactly obvious :)

Incidentally, Gordon, if you need to unpack the byte array into a struct following transmission, then this code should do it (same variables as before):

ip = Marshal.AllocHGlobal(size);
Marshal.Copy(ba, 0, ip, size);
ss = (SomeStruct)Marshal.PtrToStructure(ip, typeof(SomeStruct));
Marshal.FreeHGlobal(ip);

Well, you could do it in a few lines with this code:

using System.Runtime.InteropServices;

.......

SomeStruct ss = new SomeStruct();
int size = Marshal.SizeOf(ss);
byte[] ba = new byte[size];
IntPtr ip = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(ss, ip, true);
Marshal.Copy(ip, ba, 0, size);
Marshal.FreeHGlobal(ip);

However, for this to work properly, you need to mark your struct definition with the following attribute:

[StructLayout(LayoutKind.Sequential)]
public struct SomeStruct
{
   // code
}