二进制值和十六进制字符串相互转换的C++代码

 #include <iostream>
 #include <string>
 #include <stdint.h>

 using namespace std;

 string BinToHex(const string &strBin, bool bIsUpper = false)
 {
     string strHex;
     strHex.resize(strBin.size() * );
     for (size_t i = ; i < strBin.size(); i++)
     {
         uint8_t cTemp = strBin[i];
         for (size_t j = ; j < ; j++)
         {
             uint8_t cCur = (cTemp & 0x0f);
             if (cCur < )
             {
                 cCur += '';
             }
             else
             {
                 cCur += ((bIsUpper ? 'A' : 'a') - );
             }
             strHex[ * i +  - j] = cCur;
             cTemp >>= ;
         }
     }

     return strHex;
 }

 string HexToBin(const string &strHex)
 {
     if (strHex.size() %  != )
     {
         return "";
     }

     string strBin;
     strBin.resize(strHex.size() / );
     for (size_t i = ; i < strBin.size(); i++)
     {
         uint8_t cTemp = ;
         for (size_t j = ; j < ; j++)
         {
             char cCur = strHex[ * i + j];
             if (cCur >= '' && cCur <= '')
             {
                 cTemp = (cTemp << ) + (cCur - '');
             }
             else if (cCur >= 'a' && cCur <= 'f')
             {
                 cTemp = (cTemp << ) + (cCur - 'a' + );
             }
             else if (cCur >= 'A' && cCur <= 'F')
             {
                 cTemp = (cTemp << ) + (cCur - 'A' + );
             }
             else
             {
                 return "";
             }
         }
         strBin[i] = cTemp;
     }

     return strBin;
 }

 int main()
 {
     string strBin = "!@#$%^&*()_+~`1234567890-=";
     string strHex = "21402324255E262A28295F2B7E60313233343536373839302D3D";

     string strBinToHex = BinToHex(strBin);
     cout << strBinToHex << endl;
     strBinToHex = BinToHex(strBin, true);
     cout << strBinToHex << endl;

     string strHexToBin = HexToBin(strHex);
     cout << strHexToBin << endl;

     return ;
 }