C++二进制字符串转十六进制字符串 十六进制字符串转二进制字符串

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　　　　二进制转十六进制

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//__二进制转十六进制
std::string BinToHex(const std::string &strBin, bool bIsUpper/* = false*/)
{
 std::string strHex;
 strHex.resize(strBin.size() * 2);
 for (size_t i = 0; i < strBin.size(); i++)
 {
     uint8_t cTemp = strBin[i];
     for (size_t j = 0; j < 2; j++)
     {
         uint8_t cCur = (cTemp & 0x0f);
         if (cCur < 10)
         {
             cCur += '0';
         }
         else
         {
             cCur += ((bIsUpper ? 'A' : 'a') - 10);
         }
         strHex[2 * i + 1 - j] = cCur;
         cTemp >>= 4;
     }
 }

 return strHex;
}

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　　　　十六进制转二进制

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//十六进制转二进制
std::string HexToBin(const std::string &strHex)
{
    if (strHex.size() % 2 != 0)
    {
        return "";
    }
 
    std::string strBin;
    strBin.resize(strHex.size() / 2);
    for (size_t i = 0; i < strBin.size(); i++)
    {
        uint8_t cTemp = 0;
        for (size_t j = 0; j < 2; j++)
        {
            char cCur = strHex[2 * i + j];
            if (cCur >= '0' && cCur <= '9')
            {
                cTemp = (cTemp << 4) + (cCur - '0');
            }
            else if (cCur >= 'a' && cCur <= 'f')
            {
                cTemp = (cTemp << 4) + (cCur - 'a' + 10);
            }
            else if (cCur >= 'A' && cCur <= 'F')
            {
                cTemp = (cTemp << 4) + (cCur - 'A' + 10);
            }
            else
            {
                return "";
            }
        }
        strBin[i] = cTemp;
    }
 
    return strBin;
}

 附1：C++二进制字符串转Base64字符串 Base64字符串转二进制字符串