c#中關於結構體和字節數組轉化

最近在使用結構體與字節數組轉化來實現socket間數據傳輸。現在開始整理一下。對於Marshal可以查閱msdn，關於字節數組與結構體轉代碼如下：

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Runtime.InteropServices;
namespace FileSendClient
{

    [StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
    struct StructDemo
    {
       
        public byte a;
        public byte c;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
        public byte[] b;
        public byte d;
        public int e;
       
    }
    unsafe class Program
    {
        static void Main(string[] args)
        {
            StructDemo sd;
            sd.a = 0;
            sd.d = 0;
            sd.c = 0;
            sd.b = new byte[3] { 0, 0, 1 };
            sd.e = 5;
            int size = 0;
            //此處使用非安全代碼來獲取到StructDemo的值
            unsafe
            {
                size = Marshal.SizeOf(sd);
            }
            
            byte[] b = StructToBytes(sd,size);

            ByteToStruct(b, typeof(StructDemo));

        }


        //將Byte轉換為結構體類型
        public static byte[] StructToBytes(object structObj,int size)
        {
            StructDemo sd;
            int num = 2;
            byte[] bytes = new byte[size];
            IntPtr structPtr = Marshal.AllocHGlobal(size);
            //將結構體拷到分配好的內存空間
            Marshal.StructureToPtr(structObj, structPtr, false);
            //從內存空間拷貝到byte 數組
            Marshal.Copy(structPtr, bytes, 0, size);
            //釋放內存空間
            Marshal.FreeHGlobal(structPtr);
            return bytes;

        }

        //將Byte轉換為結構體類型
        public static object ByteToStruct(byte[] bytes, Type type)
        {
            int size = Marshal.SizeOf(type);
            if (size > bytes.Length)
            {
                return null;
            }
            //分配結構體內存空間
            IntPtr structPtr = Marshal.AllocHGlobal(size);
            //將byte數組拷貝到分配好的內存空間
            Marshal.Copy(bytes, 0, structPtr, size);
            //將內存空間轉換為目標結構體
            object obj = Marshal.PtrToStructure(structPtr, type);
            //釋放內存空間
            Marshal.FreeHGlobal(structPtr);
            return obj;
        }
    }
}