枚舉\位域\結構綜合實驗

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1.枚舉項和數值,字串如何互相轉換?2.結構和byte[]數組間如何互相轉換? 這在通訊上普遍使用!
3.位域在工控上DIO控制普遍使用,如何借鑒.
OK,上代碼!

using System;using System.Runtime.InteropServices;//http://www.cnblogs.com/pato/archive/2011/08/15/2139705.html//https://msdn.microsoft.com/zh-cn/library/asx0thw2%28v=vs.110%29.aspxnamespace EnumStructDemo{    /// <summary>    /// 測量類型:儀迪檢測裝置測量的類型    /// </summary>    public enum MeasureType : byte    {        ITEM_NULL = 0,    //空        ITEM_NY = 1,      //耐壓        ITEM_JD = 2,      //接地        ITEM_JY = 3,      //絕緣        ITEM_XL = 4,      //泄漏        ITEM_GL = 5,      //功率        ITEM_QD = 6,      //啟動        ITEM_KD = 7       //開短    }    /// <summary>    /// Binary flag, flag enum.     /// 二進位位標誌,一個枚舉執行個體包含多個枚舉值    /// 輸入控制訊號：到達位置，測量結束    /// </summary>    [System.Flags()]    public enum DigitalIN : byte    {        PositionOK = 0x01,        idiMeasureFinish = 0x02,    }    /// <summary>    /// 輸出控制訊號:儀迪裝置開始測量,啟動傳動點擊,點亮警示燈    /// </summary>    [System.Flags()]    public enum DigitalOut : byte    {        idiStart = 0x01,    //first bit is true, others is false        chuandong = 0x02,   //second bit is true,...        light = 0x04,       //third bit is true,....    }     /// <summary>    /// 儀迪命令資料幀結構定義    /// </summary>    public struct Frame    {        public byte Head;       //0.幀頭 ‘I‘        public byte Protocal;   //1.協議編號 ‘1‘        public byte AddrHigh;   //2-3.郵寄地址高位在前，佔用2位元組：0~16383        public byte AddrLow;        public byte bytCount;   //4.本幀總位元組數        public byte Reserve;    //5.保留，總是0        public byte Command;    //6.主命令編號**        public byte frameEnd;   //7.幀尾，總是‘D‘        public byte chkSum;     //8.校正和，所有位元組和的低位元組        public void Display() { }    }    /// <summary>    /// struct to byte    /// </summary>    /// <param name="obj">truct object</param>    /// <returns>string array</returns>    public class StructConvert    {        /// <summary>        /// 根據傳入的結構對象,返回對應的位元組數組的引用.        /// </summary>        /// <param name="obj">傳入對象</param>        /// <returns>託管位元組數組</returns>        public static byte[] StructToBytes(object obj)        {            int size = Marshal.SizeOf(obj);            byte[] bytes = new byte[size];//在託管堆上分配位元組數組            //Allocates memory from the unmanaged memory of the process by using the pointer to the specified number of bytes.            IntPtr structPtr = Marshal.AllocHGlobal(size);            //Marshals data from a managed object to an unmanaged block of memory.            //從託管對象obj封裝資料到非託管記憶體塊            Marshal.StructureToPtr(obj, structPtr, false);            //Copies data from an unmanaged memory pointer to a managed 8-bit unsigned integer array.            Marshal.Copy(structPtr, bytes, 0, size);            Marshal.FreeHGlobal(structPtr);            return bytes;        }        /// <summary>        /// (StructName)convert.BytesToStruct(bytes, StructName.GetType());        /// </summary>        /// <param name="bytes">byte array</param>        /// <param name="structType">struct type</param>        /// <returns>the converted struct </returns>        public static object BytesToStruct(byte[] bytes, Type structType, int indexFrom = 0)        {            //結構的大小總是>=位元組數組, 拷貝位元組數組到結構,取位元組數組大小合適            int sizeStruct = Marshal.SizeOf(structType);            int sizeBytes = bytes.Length;            //通過使用指定的位元組數，從進程的非託管記憶體中分配記憶體。分配目標對象緩衝區            IntPtr structPtr = Marshal.AllocHGlobal(sizeStruct);            //將資料從一維託管 8 位不帶正負號的整數數組複製到非託管記憶體指標。拷貝bytes到緩衝區            Marshal.Copy(bytes, indexFrom, structPtr, sizeBytes);            //將資料從非託管記憶體塊封送到新分配的指定類型的託管對象,傳回託管對象的引用. 非託管記憶體塊可銷毀!            //Marshals data from an unmanaged block of memory to a [newly allocated managed object] of the specified type.            object objStruct = Marshal.PtrToStructure(structPtr, structType);            //釋放以前從進程的非託管記憶體中分配的記憶體。            //Frees memory previously allocated from the unmanaged memory of the process.            Marshal.FreeHGlobal(structPtr);            return objStruct;        }    }    class Program    {        static void Main(string[] args)        {            //*************枚舉測試***            foreach (var item in Enum.GetNames(typeof(MeasureType)))                Console.WriteLine(item);            //根據數值獲得枚舉對象,接收儀器資料後,分析測試資料的類型            MeasureType meas = (MeasureType)1;//1代表耐壓            meas = (MeasureType)Enum.Parse(typeof(MeasureType), "ITEM_NY", ignoreCase: true);            //擷取枚舉對象的[數值],串口發送指令時可用枚舉項代表命令類型            byte jd = (byte)MeasureType.ITEM_JD;//接地是2            //測試枚舉項是否為指定標識,如是否為耐壓測試            bool ny = meas.HasFlag(MeasureType.ITEM_NY);            Console.WriteLine("jd={0},ny={1}", jd, ny);//jd = 2,ny = True            //*************位域測試***            DigitalOut DI = DigitalOut.light | DigitalOut.chuandong;            Console.WriteLine("{0}\tDI={1}", DI, (byte)DI);//chuandong, light DI = 6            if ((DI & DigitalOut.idiStart) > 0)                Console.WriteLine("啟動儀迪測試...");            //*************結構測試***            Frame frame = new Frame();//結構初始化,實值型別為0,參考型別為null                        UInt16 a = 5;            byte b = 0xf1;            int c = 0xf1f2;            Int64 d = c;            int size = Marshal.SizeOf(frame);            size = Marshal.SizeOf(a);//2            //size = Marshal.SizeOf(DI);//Error!            size = Marshal.SizeOf(b);//1            size = Marshal.SizeOf(c);//4            size = Marshal.SizeOf(d);//8            byte[] bytMeasStart = { 0x49, 0x31, 0x00, 0x01, 0x08, 0x00, 0x00, 0x44, 0xC7 };            frame = (Frame)StructConvert.BytesToStruct(bytMeasStart, frame.GetType());            byte[] bytNew = StructConvert.StructToBytes(frame);            //frame.chkSum = 199, bytNew[8] = 199            Console.WriteLine("frame.chkSum={0}, bytNew[8]={1}", frame.chkSum, bytNew[8]);            Console.ReadKey();        }    }}

 

枚舉\位域\結構綜合實驗