介绍三种将二进制字节字符转换为ASCII方法

转载地址:https://blog.csdn.net/rabbit729/article/details/3937528

下面代码分别给出了三种将二进制字节字符转换为ASCII的方法

/*
* @brief 该函数实现了将二进制字节数据转换为可打印ASCII码字符串
* @param[in] pSrc 源数据指针
* @param[in] nSrcLength 源数据长度
* @param[out] pDst 目标字符串指针
* @return 目标字符串长度
*/

#include <assert.h>
#include <iostream>
using namespace std;

int BinaryBytes2String1(const unsigned char *pSrc, unsigned int nSrcLength, char *pDst) 
{
    if(pSrc == 0 || pDst == 0)
        return 0;

    char *p = pDst;
    
    for (unsigned  i=0; i<nSrcLength; i++) {
        *p = (pSrc[i] >> 4) & 0x0f;
        *p += *p < 10 ? 0x30 : (0x61 - 10);
        p++;

        *p = pSrc[i] & 0x0f;
        *p += *p < 10 ? 0x30 : (0x61 - 10);
        p++;

        *p = pSrc[i] & 0x0f;
        *p += *p < 10 ? 0x30 : (0x61 - 10);
        p++;
    }
    
    *p = '/0';
    return nSrcLength * 2;
}

int BinaryBytes2String2(const unsigned char *pSrc, unsigned int nSrcLength, char *pDst) 
{
    if (pSrc == 0 || pDst == 0)
        return 0;

    const char tab[] = "0123456789abcdef";

    for (int i=0; i<nSrcLength; i++) {
        *pDst++ = tab[*pSrc >> 4];
        *pDst++ = tab[*pSrc & 0x0f];
        pSrc++;
    }

    *pDst = '/0';

    return nSrcLength * 2;
}

int BinaryBytes2String3(const unsigned char *pSrc, int nSrcLength, char *pDst)
{
    if (pSrc == 0 || pDst == 0)
        return 0;

    for (int i=0; i<nSrcLength; i++) {
        sprintf(pDst, "%02x", *pSrc);
        pDst++;
        pDst++;
        pSrc++;
    }
    *pDst = '/0';

    return nSrcLength * 2;
}

void main(void)
{
    unsigned char test[3] = {0x23, 0xa4, 0xB7};
    char result[7];
    memset(result, 0, 7);

    BinaryBytes2String1(test, 3, result);
    cout << result << endl;

    BinaryBytes2String2(test, 3, result);
    cout << result << endl;

    BinaryBytes2String3(test, 3, result);
    cout << result << endl;
}

输出结果为:

  23a4b7
  23a4b7
  23a4b7