C#中結(jié)構(gòu)體定義并轉(zhuǎn)換字節(jié)數(shù)組詳解

  [StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
  public struct Head
  {
    public ushort proMagic;     //包起始標(biāo)記：固定0x7e7e
    public ushort proPackLen;    //包長度：包頭 + 數(shù)據(jù)區(qū) + 包尾長度，注意不要超過最大長度限制
    public long  proSrcAddr;    //源地址：不使用，填0
    public ushort proSrcPort;    //源地址端口:不使用，填0
    public long  proDstAddr;    //目的地址：不使用，填0
    public ushort proDstPort;    //目的端口：不使用，填0
    public ushort proCmdCode;    //命令碼：參見以上命令碼定義

    public ushort proVersion;    //版本號：不使用，填1
    public char  proSerial;     //報文序號：一條報文實(shí)例對應(yīng)一個序號，不同報文疊加，0-255往復(fù)
    public ushort proPackSum;    //總包數(shù)：當(dāng)包長超過最大長度限制時，需要拆包，大包拆小包總數(shù)，不拆默認(rèn)1
    public ushort proPackId;     //當(dāng)前包號：對應(yīng)以上總包數(shù)的小包標(biāo)識，不拆默認(rèn)0

  }

  /// <summary>
  /// 終端信息查詢
  /// </summary>
  [StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
  public struct PackTerminalSearch6001
  {
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 6)]
    /// <summary>
    /// 終端編號
    /// </summary>
    public string stationCode;

    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
    /// <summary>
    /// 回復(fù)指令
    /// </summary>
    public Byte[] order;
  }
  /// <summary>
  /// 終端信息數(shù)據(jù)
  /// </summary>

  [StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
  public struct PackTerminalSearch4004
  {
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 6)]
    /// <summary>
    /// 終端編號
    /// </summary>
    public string stationCode;
    /// <summary>
    /// 終端IP
    /// </summary>
    public long terminalIP;
    /// <summary>
    /// 終端端口
    /// </summary>
    public ushort terminalPort;
    /// <summary>
    /// 中心IP
    /// </summary>
    public long serverIP;
    /// <summary>
    /// 測站端口
    /// </summary>
    public ushort serverPort;
    /// <summary>
    /// 磁盤信息數(shù)組
    /// </summary>
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
    public PackDiskInfo[] diskInfoArray;
  }

  /// <summary>
  /// 磁盤信息
  /// </summary>
  [StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
  public struct PackDiskInfo
  {
    /// <summary>
    /// 盤符
    /// </summary>
    public char drive;
    /// <summary>
    /// 總空間
    /// </summary>
    public double totalSize;
    /// <summary>
    /// 可用空間
    /// </summary>
    public double usableSize;
  }

    PackTerminalSearch6001 info;
    info.stationCode = "12345";
    info.order = new byte[6] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05 };
    Byte[] recv = StructToBytes(info);

    object obj = BytesToStuct(recv, typeof(PackTerminalSearch6001));
    PackTerminalSearch6001 info5001 = (PackTerminalSearch6001)obj;
    byte[] order = info5001.order;


    //// <summary>
    /// 結(jié)構(gòu)體轉(zhuǎn)byte數(shù)組
    /// </summary>
    /// <param name="structObj">要轉(zhuǎn)換的結(jié)構(gòu)體</param>
    /// <returns>轉(zhuǎn)換后的byte數(shù)組</returns>
    public static byte[] StructToBytes(object structObj)
    {
      //得到結(jié)構(gòu)體的大小
      int size = Marshal.SizeOf(structObj);
      //創(chuàng)建byte數(shù)組
      byte[] bytes = new byte[size];
      //分配結(jié)構(gòu)體大小的內(nèi)存空間
      IntPtr structPtr = Marshal.AllocHGlobal(size);
      //將結(jié)構(gòu)體拷到分配好的內(nèi)存空間
      Marshal.StructureToPtr(structObj, structPtr, false);
      //從內(nèi)存空間拷到byte數(shù)組
      Marshal.Copy(structPtr, bytes, 0, size);
      //釋放內(nèi)存空間
      Marshal.FreeHGlobal(structPtr);
      //返回byte數(shù)組
      return bytes;
    }

    /// <summary>
    /// byte數(shù)組轉(zhuǎn)結(jié)構(gòu)體
    /// </summary>
    /// <param name="bytes">byte數(shù)組</param>
    /// <param name="type">結(jié)構(gòu)體類型</param>
    /// <returns>轉(zhuǎn)換后的結(jié)構(gòu)體</returns>
    public static object BytesToStuct(byte[] bytes, Type type)
    {
      //得到結(jié)構(gòu)體的大小
      int size = Marshal.SizeOf(type);
      //byte數(shù)組長度小于結(jié)構(gòu)體的大小
      if (size > bytes.Length)
      {
        //返回空
        return null;
      }
      //分配結(jié)構(gòu)體大小的內(nèi)存空間
      IntPtr structPtr = Marshal.AllocHGlobal(size);
      //將byte數(shù)組拷到分配好的內(nèi)存空間
      Marshal.Copy(bytes, 0, structPtr, size);
      //將內(nèi)存空間轉(zhuǎn)換為目標(biāo)結(jié)構(gòu)體
      object obj = Marshal.PtrToStructure(structPtr, type);
      //釋放內(nèi)存空間
      Marshal.FreeHGlobal(structPtr);
      //返回結(jié)構(gòu)體
      return obj;
    }