C#关于byte的操作说明

获取byte中每一位的值

byte byData = 0x36;

int n0, n1, n2, n3, n4, n5, n6, n7;
n0 = (byData & 0x01) == 0x01 ? 1 : 0;
n1 = (byData & 0x02) == 0x02 ? 1 : 0;
n2 = (byData & 0x04) == 0x04 ? 1 : 0;
n3 = (byData & 0x08) == 0x08 ? 1 : 0;
n4 = (byData & 0x10) == 0x10 ? 1 : 0;
n5 = (byData & 0x20) == 0x20 ? 1 : 0;
n6 = (byData & 0x40) == 0x40 ? 1 : 0;
n7 = (byData & 0x80) == 0x80 ? 1 : 0;

获取int16中其中某几位的数值

bit	内容
11-15	预留
10	值7
6-9	值6
5	值5
4	值4
3	值3
2	值2
0-1	值1

        /// <param name="val"></param>
        public virtual void SetValue(UInt16 val)
        {
            Fac = (Enmus.FactoryDebugStatus)(val & 0x03);
            Fligh = (Enmus.FlyLock)((val & 0x04));
            Remoti = (Enmus.RemotingLock)(val & 0x08);
            Air = (Enmus.AirCtrl)((val & 0x10));
            Alt = (Enmus.AltHold)((val & 0x20));
            Vertl = (Enmus.VerticalCtrl)(((val >> 6) & 0x0F));
            Engin= (Enmus.Start_StopState)((val & 0x400));     
        }

　　　　　　

public UInt16 ToByte()
{
UInt16 ret = 0x00;
ret = (UInt16)(ret | ((UInt16)Waypoint << 9));
ret = (UInt16)(ret | ((UInt16)Side << 8));
ret = (UInt16)(ret | ((UInt16)Head << 7));
ret = (UInt16)(ret | ((UInt16)ToHeight << 6));
ret = (UInt16)(ret | ((UInt16)Height << 5));
ret = (UInt16)(ret | ((UInt16)LostContact << 3));
ret = (UInt16)(ret | ((UInt16)TaskDevice << 2));
ret = (UInt16)(ret | ((UInt16)Line));
return ret;
}

 结构体和byte数组互相转换

        /// <summary>
        /// 结构体转byte数组
        /// </summary>
        /// <param name="structObj"></param>
        /// <returns></returns>
        public static byte[] StructToBytes<T>(T structObj) where T : struct
        {
            //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;
        }

        /// <summary>
        /// byte数组转结构体
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public static T BytesToStuct<T>(byte[] bytes) where T : struct
        { 
            //得到结构体的大小
            Type type = typeof(T);
            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 default(T);
            }
            //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
            var obj = Marshal.PtrToStructure(structPtr, type);
            //释放内存空间
            Marshal.FreeHGlobal(structPtr);
            if (obj is T t)
            {
                return t;
            }
            return default(T);
        }

 

设置byte每一位的值

        /// <summary>
        /// 设置该字节的某一位的值(将该位设置成0或1)
        /// </summary>
        /// <param name="data">要设置的字节byte</param>
        /// <param name="index">要设置的位， 值从低到高为 1-8</param>
        /// <param name="flag">要设置的值 true(1) / false(0)</param>
        /// <returns></returns>
        public static byte SetbitValue(byte data, int index, bool flag)
        {
            if (index > 8 || index < 1)
                throw new ArgumentOutOfRangeException();
            int v = index < 2 ? index : (2 << (index - 2));
            return flag ? (byte)(data | v) : (byte)(data & ~v);
        }

获取byte中其中某一位的值

        /// <summary>
        /// 获取字节中的指定Bit的值
        /// </summary>
        /// <param name="this">字节</param>
        /// <param name="index">Bit的索引值(0-7)</param>
        /// <returns></returns>
        public static int GetBit(byte data, short index)
        {
            byte x = 1;
            switch (index)
            {
                case 0: { x = 0x01; } break;
                case 1: { x = 0x02; } break;
                case 2: { x = 0x04; } break;
                case 3: { x = 0x08; } break;
                case 4: { x = 0x10; } break;
                case 5: { x = 0x20; } break;
                case 6: { x = 0x40; } break;
                case 7: { x = 0x80; } break;
                default: { return 0; }
            }
            return (data & x) == x ? 1 : 0;
        }