URLEncode与URLDecode总结与实现
URLEncode：
用于编码URL字符串，数字和字母保持不变，空格变为‘+‘，其他（如：中文字符）先转换为十六进制表示，然后在每个字节前面加一个标识符%，
例如：“啊”字 Ascii的十六进制是0xB0A1——>%B0%A1
代码实现：
1 unsigned char CHAR_TO_HEX( unsigned char ch ) 2 { 3 ????//0xa(10)转化为字符‘A‘(65)，要加上55 //0x0(0)转化为字符‘0‘(48)，要加上48 4 ????return (unsigned char)(ch > 9 ? ch + 55: ch + 48); 5 } 6 ?7 std::string URLEncode(const char* pSrc) 8 { 9 ????unsigned char chTemp;10 ????std::string strDest;11 12 ????while (*pSrc)13 ????{14 ????????chTemp = (unsigned char)*pSrc;15 ????????if ( (chTemp >= ‘a‘ && chTemp <= ‘z‘) || (chTemp >= ‘A‘ && chTemp <= ‘Z‘) || (chTemp >= ‘0‘ && chTemp <= ‘9‘)16 ????????????|| strchr("-_.!~*‘()", chTemp))17 ????????{18 ????????????strDest += chTemp;19 ????????}20 ?????????else if (chTemp == ‘ ‘)21 ?????????{22 ?????????????*pDest++ = ‘+‘;23 ?????????}24 ????????else25 ????????{26 ????????????strDest += ‘%‘;27 ????????????strDest += CHAR_TO_HEX( (unsigned char)(chTemp >> 4) );28 ????????????strDest += CHAR_TO_HEX( (unsigned char)(chTemp & 0x0f) );29 ????????}30 ????????++pSrc;31 ????}32 33 ????return strDest;34 }URLDecode：
用于解码已编码的URL 字符串，解码方式与URLEncode相反
代码实现：
1 unsigned char* URLDecode(unsigned char* pSrc, std::string &strDest) 2 { 3 ????char szTemp[2]; 4 ?5 ????while (*pSrc) 6 ????{ 7 ????????memset(szTemp, ‘/0‘, 2 ); 8 ????????if( *pSrc != ‘%‘ && *pSrc != ‘ ‘) 9 ????????{10 ????????????strDest += *pSrc++;11 ????????????continue;12 ????????}13 ????????else if( *pSrc == ‘ ‘ )14 ????????{15 ????????????strDest += ‘+‘;16 ????????????continue;17 ????????}18 ????????//忽略%19 ????????++pSrc;20 ????????unsigned char cTmp = 0;21 22 ????????for (int k = 0; k < 2 && *pSrc; ++k, ++pSrc) //例如：将%3f ---> 0x3f23 ????????{24 ????????????if(*pSrc <= ‘9‘)//0x30~0x3925 ????????????{26 ????????????????cTmp |= (*pSrc & 0x0f) << (1 - k) * 4;27 ????????????}28 ????????????else if(*pSrc >= ‘a‘)//0x61~7a29 ????????????{30 ????????????????cTmp |= (*pSrc - 0x57) << (1 - k) * 4;31 ????????????}32 ????????????else//0x41~5a33 ????????????{34 ????????????????cTmp |= (*pSrc - 0x37) << (1 - k) * 4;35 ????????????}36 ????????}37 ????????strDest += cTmp;38 ????}39 ????return 0;40 }原文地址：http://www.cnblogs.com/dongsheng/p/4383516.html
（转载）URLEncode与URLDecode总结与实现
原文地址：https://www.cnblogs.com/wodehao0808/p/8616799.html