C#里使用CopyMemory

Socket接收到的byte []要转换成自定义的struct / 自定义Struct转换成byte []都相当麻烦
用循环去转换太浪费时间了……于是想到用CopyMemory，Google一圈终于搞定
下面的代码是在Snippet Compiler里编译通过的

C#代码

#region Imports
using System;
using System.IO;
using System.Net;
using System.Xml;
using System.Text;
using System.Data;
using System.Drawing;
using System.Threading;
using System.Reflection;
using System.Collections;
using System.Net.Sockets;
using System.Windows.Forms;
using System.ComponentModel;
using System.Drawing.Imaging;
using System.Security.Cryptography;
using System.Runtime.InteropServices;
using System.Text.RegularExpressions;
#endregion
#region Assembly Info
[assembly: AssemblyTitle("Test Application by eglic")]
[assembly: AssemblyDescription("Test Application by eglic")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("eGlic.Com")]
[assembly: AssemblyProduct("Test Application by eglic")]
[assembly: AssemblyCopyright("Copyright (C) eGlic.Com 2007")]
[assembly: AssemblyTrademark("eGlic.Com")]
[assembly: AssemblyCulture("")]
[assembly: ComVisible(false)]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]
#endregion

namespace eGlic
{
    #region Application Entrance
    public class Test{
        [STAThread]
        public static void Main() {
            byte [] buffer=new byte [20];
            DataGraphHeader header=new DataGraphHeader();
            string data="ABCDEFGH";

            header.Signature=0xFF;
            header.Protocol.Type=1;
            header.Protocol.Version=1;
            header.Type=99;
            header.SerialID=1234567;
            header.Size=8;

            Win32API.CopyMemoryEx(buffer,ref header);
            Win32API.CopyMemoryEx(buffer,12,System.Text.Encoding.ASCII.GetBytes(data),0,8);

            string o="";
            for(int i=0;i
                if(buffer[i]<10) o+="0";
                o+=String.Format("{0:X}",buffer[i]);
                o+=" ";
            }
            MessageBox.Show(o,"转成Byte []之后的数据包",MessageBoxButtons.OK,MessageBoxIcon.Information);

            DataGraphHeader h=new DataGraphHeader();
            byte [] buf;
            string d="";

            Win32API.CopyMemoryEx(ref h,buffer);
            buf=new byte [h.Size];
            Win32API.CopyMemoryEx(buf,buffer,12,h.Size);

            o="h.Signature=" +h.Signature.ToString()+"/r/n";
            o+="h.Protocol.Type=" +h.Protocol.Type.ToString()+"/r/n";
            o+="h.Protocol.Version=" +h.Protocol.Version.ToString()+"/r/n";
            o+="h.Type=" +h.Type.ToString()+"/r/n";
            o+="h.SerialID=" +h.SerialID.ToString()+"/r/n";
            o+="h.Size=" +h.Size.ToString()+"/r/n";
            o+="附加数据为："+System.Text.Encoding.ASCII.GetString(buf);
            MessageBox.Show(o,"解析后数据包",MessageBoxButtons.OK,MessageBoxIcon.Information);
        }

    }
    #endregion

    #region Win32API
    public class Win32API {
        [DllImport("kernel32.dll", EntryPoint = "RtlMoveMemory", CharSet = CharSet.Ansi)]
        public extern static long CopyMemory(IntPtr dest, IntPtr source, int size);
        #region CopyMemoryEx
        ///
        /// CopyMemoryEx
        ///
        /// 目标缓存区
        /// DataGraphPackage
        ///
        public unsafe static long CopyMemoryEx(byte[] dest, ref DataGraphHeader source) {
            return CopyMemoryEx(dest, 0,ref source);
        }
        ///
        /// CopyMemoryEx
        ///
        /// 目标缓存区
        /// 目标缓存区中的开始位置
        /// DataGraphPackage
        ///
        public unsafe static long CopyMemoryEx(byte[] dest,int DestStart, ref DataGraphHeader source) {
            IntPtr dp;
            IntPtr sp;
            fixed (byte* ds = &dest[DestStart]) {
                fixed (DataGraphHeader* sr = &source) {
                    dp = (IntPtr)ds;
                    sp = (IntPtr)sr;
                    return CopyMemory(dp, sp, sizeof(DataGraphHeader));
                }
            }
        }
        ///
        /// CopyMemoryEx
        ///
        /// DataGraphPackage
        /// 源数据缓存
        ///
        public unsafe static long CopyMemoryEx(ref DataGraphHeader dest, byte[] source) {
            return CopyMemoryEx(ref dest, source, 0);
        }
        ///
        /// CopyMemoryEx
        ///
        /// DataGraphPackage
        /// 源数据缓存
        ///
        public unsafe static long CopyMemoryEx(ref DataGraphHeader dest, byte[] source,int SourceStart) {
            IntPtr dp;
            IntPtr sp;
            fixed (DataGraphHeader* ds = &dest) {
                fixed (byte* sr = &source[SourceStart]) {
                    dp = (IntPtr)ds;
                    sp = (IntPtr)sr;
                    return CopyMemory(dp, sp, sizeof(DataGraphHeader));
                }
            }
        }
        ///
        /// CopyMemoryEx
        ///
        /// 目标缓存
        /// 源数据
        /// 要从源数据中复制的长度
        ///
        public unsafe static long CopyMemoryEx(byte[] dest, byte[] source, int size) {
            return CopyMemoryEx(dest, 0, source, 0, size);
        }
        ///
        /// CopyMemoryEx
        ///
        /// 目标缓存
        /// 源数据
        /// 源数据缓存中开始位置
        /// 要从源数据中复制的长度
        ///
        public unsafe static long CopyMemoryEx(byte[] dest, byte[] source, int SourceStart,int size) {
            return CopyMemoryEx(dest, 0, source, SourceStart, size);
        }
        ///
        /// CopyMemoryEx
        ///
        /// 目标缓存
        /// 目标缓存中开始复制的位置
        /// 源数据
        /// 源数据缓存中开始位置
        /// 要从源数据中复制的长度
        ///
        public unsafe static long CopyMemoryEx(byte[] dest,int DestStart, byte[] source, int SourceStart, int size) {
            IntPtr dp;
            IntPtr sp;
            fixed (byte* ds = &dest[DestStart]) {
                fixed (byte* sr = &source[SourceStart]) {
                    dp = (IntPtr)ds;
                    sp = (IntPtr)sr;
                    return CopyMemory(dp, sp, size);
                }
            }
        }
        #endregion
    }
    #endregion

    [StructLayout(LayoutKind.Sequential)]
    public struct ProtocolInfo {
        public byte Type;
        public byte Version;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct DataGraphHeader {
        public byte Signature;              //包头：    1字节
        public ProtocolInfo Protocol;       //协议：    2字节
        public byte Type;                   //包类型：  1字节
        public uint SerialID;               //包序号    4字节
        public int Size;                    //包尺寸    4字节
    }
}