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hex 与ASCII 、字符串相互转换

news 来源：原创 2024/9/16 19:20:45

ascii转换为hex

例如：{'A'} --> 0xA

unsigned char AsciiToHex(unsigned char cNum)
{
    if(cNum>='0'&&cNum<='9')
    {
        cNum -= '0';
    }
    else if(cNum>='A'&&cNum<='F')
    {
        cNum -= 'A';
        cNum += 10;
    }
    else if(cNum>='a'&&cNum<='f')
    {
        cNum -= 'a';
        cNum += 10;
    }
    return cNum;
}

字符串转换为hex

例如："C8329BFD0E01" --> {0xC8, 0x32, 0x9B, 0xFD, 0x0E, 0x01}

void StrToHex(char *ptr, unsigned char *pdst,unsigned short len)
{
    unsigned char n1 = 0;
    unsigned char n2 = 0;
    unsigned char num = 0;
    unsigned short i = 0;
    unsigned short index = 0;

    for (i = 0; i < len; i++)
    {
        index = i << 1;                //index=i*2
        n1 = AsciiToHex(ptr[index]);
        n2 = AsciiToHex(ptr[index + 1]);
        num = (n1 << 4) + n2;
        pdst[i] = num;
        
    }
}

数字转化为字符串

比如：123——>"123"

void Dnum2Str(unsigned char * str, unsigned int num, unsigned char digit)
{
    unsigned char index[] = "0123456789";
    char i = digit;
    do
    {
        str[--i] = index[num%10];
        num /= 10;
    } while (i);
}

数字转化为hex十六进制的字符串

例如：十进制24 = 十六进制18 再转成字符串"18"

void Num2HexStr(char *str, unsigned long num, unsigned char digit)
{
    unsigned char index[]="0123456789ABCDEF";
    char i = digit;
    do
    {
        str[--i] = index[num%16];
        num /= 16;
    }while(i);

}

16进制hex转化成字符串

例如：{0xC8, 0x32, 0x9B, 0xFD, 0x0E, 0x01} --> "C8329BFD0E01"

void Hex2Str(char* pSrc, char* pDst, unsigned int nSrcLength)
{
    int i = 0;
    const char tab[]="0123456789ABCDEF";    // 0x0-0xf的字符查找表

    for (i = 0; i < nSrcLength; i++)
    {
        *pDst++ = tab[*pSrc >> 4];        // 输出高4位
        *pDst++ = tab[*pSrc & 0x0f];    // 输出低4位
        pSrc++;
    }

    // 输出字符串加个结束符
    *pDst = '\0';
}

字符串转为hex(字符串形式)

例如：str = +002321N ->hex = 2b3030323332314e

void Str2HexStr(char * Str,char * HexStr)
{
    int i =0;
    u8 dec;
    char * p = HexStr;
    u8 hex = 0;
    const char tab[]="0123456789ABCDEF";// 0x0-0xf的字符查找表
    for(i = 0;Str[i];i++)
    {
        dec = *(Str+i);//十进制表示一个ACCII
        hex = dec/16;
        *p = tab[hex];
        p++;
        hex = dec%16;
        *p = tab[hex];
        p++;
    }
    *p = 0;//最后一位赋值0
}

hex字符串转为字符串

例如：hex = 2b3030323332314e ->str = +002321N

u16 HexStr2Str(char * HexStr,char * Str)
{
    u16 i =0;
    char * p = Str;
    
    for(i = 0;HexStr[i]&&HexStr[i+1];i+=2,p++)
    {
        //高四位
        if((HexStr[i]<='9')&&(HexStr[i]>='0'))
        {
            *p = (HexStr[i]-'0')*16;
        }
        else if((HexStr[i]<='F')&&(HexStr[i]>='A'))
        {
            *p = (HexStr[i]-'A'+10)*16;
        }
        else if((HexStr[i]<='f')&&(HexStr[i]>='a'))
        {
            *p = (HexStr[i]-'a'+10)*16;
        }
        else//不符合格式，因为可能出现了除了0-9,a-f或者A-F之外的数据
            return 0;
        
        //低四位
        if((HexStr[i+1]<='9')&&(HexStr[i+1]>='0'))
        {
            *p += (HexStr[i+1]-'0');
        }
        else if((HexStr[i+1]<='F')&&(HexStr[i+1]>='A'))
        {
            *p += (HexStr[i+1]-'A'+10);
        }
        else if((HexStr[i+1]<='f')&&(HexStr[i+1]>='a'))
        {
            *p += (HexStr[i+1]-'a'+10);
        }
        else//不符合格式，因为可能出现了除了0-9,a-f或者A-F之外的数据
            return 0;
    }
    *p = 0;//最后一位赋值0
    return i/2;//返回数据的位数
}