C#中结构体定义并转换字节数组详解

 [StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)] public struct Head { public ushort proMagic;     //包起始标记：固定0x7e7e public ushort proPackLen;    //包长度：包头 + 数据区 + 包尾长度，注意不要超过最大长度限制 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;    //命令码：参见以上命令码定义 public ushort proVersion;    //版本号：不使用，填1 public char  proSerial;     //报文序号：一条报文实例对应一个序号，不同报文叠加，0-255往复 public ushort proPackSum;    //总包数：当包长超过最大长度限制时，需要拆包，大包拆小包总数，不拆默认1 public ushort proPackId;     //当前包号：对应以上总包数的小包标识，不拆默认0 } 

 /// 
 /// 终端信息查询 /// 
 [StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)] public struct PackTerminalSearch5001 { [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 6)] /// 
 /// 终端编号 /// 
 public string stationCode; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)] /// 
 /// 回复指令 /// 
 public Byte[] order; } /// 
 /// 终端信息数据 /// 
 [StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)] public struct PackTerminalSearch3004 { [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 6)] /// 
 /// 终端编号 /// 
 public string stationCode; /// 
 /// 终端IP /// 
 public long terminalIP; /// 
 /// 终端端口 /// 
 public ushort terminalPort; /// 
 /// 中心IP /// 
 public long serverIP; /// 
 /// 测站端口 /// 
 public ushort serverPort; /// 
 /// 磁盘信息数组 /// 
 [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)] public PackDiskInfo[] diskInfoArray; } /// 
 /// 磁盘信息 /// 
 [StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)] public struct PackDiskInfo { /// 
 /// 盘符 /// 
 public char drive; /// 
 /// 总空间 /// 
 public double totalSize; /// 
 /// 可用空间 /// 
 public double usableSize; } 

 PackTerminalSearch5001 info; info.stationCode = "12345"; info.order = new byte[6] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05 }; Byte[] recv = StructToBytes(info); object obj = BytesToStuct(recv, typeof(PackTerminalSearch5001)); PackTerminalSearch5001 info5001 = (PackTerminalSearch5001)obj; byte[] order = info5001.order; //// 
 /// 结构体转byte数组 /// 
 /// 要转换的结构体 /// 转换后的byte数组 public static byte[] StructToBytes(object structObj) { //得到结构体的大小 int size = Marshal.SizeOf(structObj); //创建byte数组 byte[] bytes = new byte[size]; //分配结构体大小的内存空间 IntPtr structPtr = Marshal.AllocHGlobal(size); //将结构体拷到分配好的内存空间 Marshal.StructureToPtr(structObj, structPtr, false); //从内存空间拷到byte数组 Marshal.Copy(structPtr, bytes, 0, size); //释放内存空间 Marshal.FreeHGlobal(structPtr); //返回byte数组 return bytes; } /// 
 /// byte数组转结构体 /// 
 /// byte数组 /// 结构体类型 /// 转换后的结构体 public static object BytesToStuct(byte[] bytes, Type type) { //得到结构体的大小 int size = Marshal.SizeOf(type); //byte数组长度小于结构体的大小 if (size > bytes.Length) { //返回空 return null; } //分配结构体大小的内存空间 IntPtr structPtr = Marshal.AllocHGlobal(size); //将byte数组拷到分配好的内存空间 Marshal.Copy(bytes, 0, structPtr, size); //将内存空间转换为目标结构体 object obj = Marshal.PtrToStructure(structPtr, type); //释放内存空间 Marshal.FreeHGlobal(structPtr); //返回结构体 return obj; }