枚举\位域\结构综合实验-白红宇

枚举\位域\结构综合实验

阅读量：5961 次

发布时间：2019-06-19

本文共 5621 字，大约阅读时间需要 18 分钟。

1.枚举项和数值,字符串如何互相转换?2.结构和byte[]数组间如何互相转换? 这在通讯上普遍使用!

3.位域在工控上DIO控制普遍使用,如何借鉴.

OK,上代码!

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{    ///     /// 测量类型:仪迪检测设备测量的类型    /// 
    public enum MeasureType : byte    {        ITEM_NULL = 0,    //空        ITEM_NY = 1,      //耐压        ITEM_JD = 2,      //接地        ITEM_JY = 3,      //绝缘        ITEM_XL = 4,      //泄漏        ITEM_GL = 5,      //功率        ITEM_QD = 6,      //启动        ITEM_KD = 7       //开短    }    ///     /// Binary flag, flag enum.     /// 二进制位标志,一个枚举实例包含多个枚举值    /// 输入控制信号：到达位置，测量结束    /// 
    [System.Flags()]    public enum DigitalIN : byte    {        PositionOK = 0x01,        idiMeasureFinish = 0x02,    }    ///     /// 输出控制信号:仪迪设备开始测量,启动传动点击,点亮报警灯    /// 
    [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,....    }     ///     /// 仪迪命令数据帧结构定义    /// 
    public struct Frame    {        public byte Head;       //0.帧头 'I'        public byte Protocal;   //1.协议编号 '1'        public byte AddrHigh;   //2-3.通讯地址高位在前，占用2字节：0~16383        public byte AddrLow;        public byte bytCount;   //4.本帧总字节数        public byte Reserve;    //5.保留，总是0        public byte Command;    //6.主命令编号**        public byte frameEnd;   //7.帧尾，总是'D'        public byte chkSum;     //8.校验和，所有字节和的低字节        public void Display() { }    }    ///     /// struct to byte    /// 
    /// truct object    /// 
     
      string array
         public class StructConvert    {        ///         /// 根据传入的结构对象,返回对应的字节数组的引用.        /// 
        /// 传入对象        /// 
     
      托管字节数组
             public static byte[] StructToBytes(object obj)        {            int size = Marshal.SizeOf(obj);            byte[] bytes = new byte[size];//在托管堆上分配字节数组            //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.            //从托管对象obj封装数据到非托管内存块            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;        }        ///         /// (StructName)convert.BytesToStruct(bytes, StructName.GetType());        /// 
        /// byte array        /// struct type        /// 
     
      the converted struct 
             public static object BytesToStruct(byte[] bytes, Type structType, int indexFrom = 0)        {            //结构的大小总是>=字节数组, 拷贝字节数组到结构,取字节数组大小合适            int sizeStruct = Marshal.SizeOf(structType);            int sizeBytes = bytes.Length;            //通过使用指定的字节数，从进程的非托管内存中分配内存。分配目标对象缓冲区            IntPtr structPtr = Marshal.AllocHGlobal(sizeStruct);            //将数据从一维托管 8 位无符号整数数组复制到非托管内存指针。拷贝bytes到缓冲区            Marshal.Copy(bytes, indexFrom, structPtr, sizeBytes);            //将数据从非托管内存块封送到新分配的指定类型的托管对象,传回托管对象的引用. 非托管内存块可销毁!            //Marshals data from an unmanaged block of memory to a [newly allocated managed object] of the specified type.            object objStruct = Marshal.PtrToStructure(structPtr, structType);            //释放以前从进程的非托管内存中分配的内存。            //Frees memory previously allocated from the unmanaged memory of the process.            Marshal.FreeHGlobal(structPtr);            return objStruct;        }    }    class Program    {        static void Main(string[] args)        {            //*************枚举测试***            foreach (var item in Enum.GetNames(typeof(MeasureType)))                Console.WriteLine(item);            //根据数值获得枚举对象,接收仪器数据后,分析测试数据的类型            MeasureType meas = (MeasureType)1;//1代表耐压            meas = (MeasureType)Enum.Parse(typeof(MeasureType), "ITEM_NY", ignoreCase: true);            //获取枚举对象的[数值],串口发送指令时可用枚举项代表命令类型            byte jd = (byte)MeasureType.ITEM_JD;//接地是2            //测试枚举项是否为指定标识,如是否为耐压测试            bool ny = meas.HasFlag(MeasureType.ITEM_NY);            Console.WriteLine("jd={0},ny={1}", jd, ny);//jd = 2,ny = True            //*************位域测试***            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("启动仪迪测试...");            //*************结构测试***            Frame frame = new Frame();//结构初始化,值类型为0,引用类型为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();        }    }}