#include <ctype.h>
std::string UrlEncode(const std::string& szToEncode)
{
std::string src = szToEncode;
char hex[] = "0123456789ABCDEF"; string dst; for (size_t i = 0; i < src.size(); ++i) { unsigned char cc = src[i]; if (isascii(cc)) { if (cc == ' ') { dst += "%20"; } else dst += cc; } else { unsigned char c = static_cast<unsigned char>(src[i]); dst += '%'; dst += hex[c / 16]; dst += hex[c % 16]; } } return dst;}std::string UrlDecode(const std::string& szToDecode){ std::string result; int hex = 0; for (size_t i = 0; i < szToDecode.length(); ++i) { switch (szToDecode[i]) { case '+': result += ' '; break; case '%': if (isxdigit(szToDecode[i + 1]) && isxdigit(szToDecode[i + 2])) { std::string hexStr = szToDecode.substr(i + 1, 2); hex = strtol(hexStr.c_str(), 0, 16); //字母和数字[0-9a-zA-Z]、一些特殊符号[$-_.+!*'(),] 、以及某些保留字[$&+,/:;=?@] //可以不经过编码直接用于URL if (!((hex >= 48 && hex <= 57) || //0-9 (hex >=97 && hex <= 122) || //a-z (hex >=65 && hex <= 90) || //A-Z //一些特殊符号及保留字[$-_.+!*'(),] [$&+,/:;=?@] hex == 0x21 || hex == 0x24 || hex == 0x26 || hex == 0x27 || hex == 0x28 || hex == 0x29 || hex == 0x2a || hex == 0x2b|| hex == 0x2c || hex == 0x2d || hex == 0x2e || hex == 0x2f || hex == 0x3A || hex == 0x3B|| hex == 0x3D || hex == 0x3f || hex == 0x40 || hex == 0x5f )) { result += char(hex); i += 2; } else result += '%'; }else { result += '%'; } break; default: result += szToDecode[i]; break; } } return result;}