关于c# 2进制数据高位和低位的问题

Question

c#二进制数据高位

Answer 1

个人觉得在string转成byte的时候，可以将byte反转Array.Reverse(bytes);

Answer 2

这是C语言的算法 得出的值是正确的。  不太懂C语言- -
 void data_prepare(){
 
 
// UART_receive_buf(R_Data);//memcpy  --mem copy
buff_pos=0; 
 
Rad.object_id=R_Data[0]>>2;//  6bit
Rad.length=((R_Data[0]&0x03)<<6)|((R_Data[1]&0xfc)>>2);//8bit
Rad.speed_y=((R_Data[1]&0x03)<<9)|(R_Data[2]<<1)|((R_Data[3]&0x80)>>7);//11bit
Rad.speed_x=((R_Data[3]&0x7f)<<4)|((R_Data[4]&0xf0)>>4);//11bit
Rad.y_point=((R_Data[4]&0x0f)<<10)|(R_Data[5]<<2)|((R_Data[6]&0xc0)>>6);//14bit
Rad.x_point=((R_Data[6]&0x3f)<<8)|R_Data[7];//14bit

if((FeatureMeg[7]&0x02)==0){
//FeatureMeg 1
statis.Avspeed=FeatureMeg[0]<<8 | FeatureMeg[1];
statis.speed85=FeatureMeg[2]<<2 | (FeatureMeg[3]&0xc0);
statis.headway=FeatureMeg[4]<<9 |(FeatureMeg[5]<<1)|(FeatureMeg[6]&0x80);
statis.lane=(FeatureMeg[6]>>4)&0x07;
statis.measureline=(FeatureMeg[6]&0x03)>>2;
}
else{
//FeatureMeg 2
statis.Occupancy=FeatureMeg[0]<<6 | FeatureMeg[1]>>2;
statis.Volume=(FeatureMeg[1]&0x03)<<12 | (FeatureMeg[2]<<4)| ((FeatureMeg[3]&0xf0)>>4);
statis.VehicleClass=FeatureMeg[3] & 0x0f;
statis.Gap=FeatureMeg[4]<<9 |(FeatureMeg[5]<<1)|(FeatureMeg[6]&0x80);
}
}
//static void data_calc(){
void data_calc(){
int ID;
float Length;
float X_Speed,Y_Speed;
float X_Point,Y_Point;
//
float Avspeed;
int speed85,lane,measureline;
long headway;
//
//?′ê±êy?Y????
ID=Rad.object_id;
Length=Rad.length * 0.2;
X_Point=(Rad.x_point - 8192) * 0.064;
Y_Point=(Rad.y_point - 8192) * 0.064;
X_Speed=(Rad.speed_x - 1024) * 0.1;
Y_Speed=(Rad.speed_y - 1024) * 0.1;
//í3??êy?Y????
Avspeed=(statis.Avspeed-32767) * 0.01;
speed85=(statis.speed85-300);
headway=statis.headway * 0.028;
lane=statis.lane;
measureline=statis.measureline;
  printf("ID=%d\n",ID);
printf("Length= %4.2f m\n",Length);
printf("X_Speed= %4.2f m/s\n",X_Speed);
printf("Y_Speed= %4.2f m/s \n",Y_Speed);
printf("X_Point= %4.2f m\n",X_Point);
printf("Y_Point= %4.2f m\n",Y_Point);}

Answer 3

C语言和Java都是通过移位来实现的

Answer 4

C语言，Java都是从高位到低位的转换的，但是C#貌似是相反的，所以得反转一下再处理

Answer 5

看下这个样子和C的代码结果一致不，C#这边的位移和逻辑运算和C没什么区别，一般都能移植的。你那段代码不对是因为this.bits = new BitArray(bytes);的时候每一个byte里的二进制位被反向了。internal class Program
{
    private static void Main(string[] args)
    {
        string temp = "58.29.FE.C0.A8.12.64.57";
        byte[] bytes = Hex2ByteArr(temp);
        MyData data = new MyData(bytes);
    }    public static byte[] Hex2ByteArr(string hexStr)
    {
        return hexStr.Split('.').Select(h => Convert.ToByte(h, 16)).ToArray();
    }
}internal class MyData
{
    public MyData(byte[] bytes)
    {
        if (bytes == null || bytes.Length != 8)
            throw new ArgumentException("must be an array of 8 bytes");        var object_Id = bytes[0] >> 2;//  6bit
        var length = ((bytes[0] & 0x03) << 6) | ((bytes[1] & 0xfc) >> 2);//8bit
        var speed_y = ((bytes[1] & 0x03) << 9) | (bytes[2] << 1) | ((bytes[3] & 0x80) >> 7);//11bit
        var speed_x = ((bytes[3] & 0x7f) << 4) | ((bytes[4] & 0xf0) >> 4);//11bit
        var y_point = ((bytes[4] & 0x0f) << 10) | (bytes[5] << 2) | ((bytes[6] & 0xc0) >> 6);//14bit
        var x_point = ((bytes[6] & 0x3f) << 8) | bytes[7];//14bit           ObjectId = object_Id;
        ObjectLength = length * 0.2f;
        RangeX = (x_point - 8192) * 0.064f;
        RangeY = (y_point - 8192) * 0.064f;
        VelocityX = (speed_x - 1024) * 0.1f;
        VelocityY = (speed_y - 1024) * 0.1f;
    }    public int ObjectId { get; set; }
    public float ObjectLength { get; set; }
    public float VelocityY { get; set; }
    public float VelocityX { get; set; }
    public float RangeY { get; set; }
    public float RangeX { get; set; }
}