//struct转换为byte[]
        public static byte[] StructToBytes(object structObj)
        {
            int size = Marshal.SizeOf(structObj);
            IntPtr buffer = Marshal.AllocHGlobal(size);
            try
            {
                Marshal.StructureToPtr(structObj, buffer, false);
                byte[] bytes = new byte[size];
                Marshal.Copy(buffer, bytes, 0, size);
                return bytes;
            }
            finally
            {
                Marshal.FreeHGlobal(buffer);
            }
        }

        //byte[]转换为struct
        public static object BytesToStruct(byte[] bytes, Type type)
        {
            int size = Marshal.SizeOf(type);
            IntPtr buffer = Marshal.AllocHGlobal(size);
            try
            {
                Marshal.Copy(bytes, 0, buffer, size);
                return Marshal.PtrToStructure(buffer, type);
            }
            finally
            {
                Marshal.FreeHGlobal(buffer);
            }
        }

//IntPtr转byte[]

IntPtr y;//初始化 略
byte[] ys = new byte[yLength];
Marshal.Copy(y, ys, 0, yLength);

//byte[]转换为Intptr
        public static Intptr BytesToIntptr(byte[] bytes)
        {
            int size = bytes.Length;
            IntPtr buffer = Marshal.AllocHGlobal(size);
            try
            {
                Marshal.Copy(bytes, 0, buffer, size);
                return buffer;
            }
            finally
            {
                Marshal.FreeHGlobal(buffer);
            }
        }