关于UrlEncode的实现(C++)。网上有非常多不同的版本号。对须要编码的字符集的选取并不统一。那么究竟有没有标准呢？答案是有的。
绝对不编码的，仅仅有字母、数字、短横线(-)、下划线(_)、点(.)和波浪号(~)，其它字符要视情况而定。所以一般性的urlencode仅仅需保留上述字符不进行编码。
以下给出实现：
unsigned char ToHex(unsigned char x) { return x > 9 ? x + 55 : x + 48; } unsigned char FromHex(unsigned char x) { unsigned char y; if (x >= 'A' && x <= 'Z') y = x - 'A' + 10; else if (x >= 'a' && x <= 'z') y = x - 'a' + 10; else if (x >= '0' && x <= '9') y = x - '0'; else assert(0); return y; } std::string UrlEncode(const std::string& str) { std::string strTemp = ""; size_t length = str.length(); for (size_t i = 0; i < length; i++) { if (isalnum((unsigned char)str[i]) || (str[i] == '-') || (str[i] == '_') || (str[i] == '.') || (str[i] == '~')) strTemp += str[i]; else if (str[i] == ' ') strTemp += "+"; else { strTemp += '%'; strTemp += ToHex((unsigned char)str[i] >> 4); strTemp += ToHex((unsigned char)str[i] % 16); } } return strTemp; } std::string UrlDecode(const std::string& str) { std::string strTemp = ""; size_t length = str.length(); for (size_t i = 0; i < length; i++) { if (str[i] == '+') strTemp += ' '; else if (str[i] == '%') { assert(i + 2 < length); unsigned char high = FromHex((unsigned char)str[++i]); unsigned char low = FromHex((unsigned char)str[++i]); strTemp += high*16 + low; } else strTemp += str[i]; } return strTemp; }
补充知识：C++中URL解码/编码
我就废话不多说了，大家还是直接看代码吧~
#include <iostream> #include <string>using namespace std; char dec2hexChar(short int n) {if (0 <= n && n <= 9) {return char(short('0') + n);}else if (10 <= n && n <= 15) {return char(short('A') + n - 10);}else {return char(0);}} short int hexChar2dec(char c) {if ('0' <= c && c <= '9') {return short(c - '0');}else if ('a' <= c && c <= 'f') {return (short(c - 'a') + 10);}else if ('A' <= c && c <= 'F') {return (short(c - 'A') + 10);}else {return -1;}} string escapeURL(const string& URL){string result = "";for (unsigned int i = 0; i < URL.length(); i++) {char c = URL[i];if (('0' <= c && c <= '9') ||('a' <= c && c <= 'z') ||('A' <= c && c <= 'Z') ||c == '/' || c == '.') {result += c;}else {int j = (short int)c;if (j < 0) {j += 256;}int i1, i0;i1 = j / 16;i0 = j - i1 * 16;result += '%';result += dec2hexChar(i1);result += dec2hexChar(i0);}}return result;} string deescapeURL(const string& URL) {string result = "";for (unsigned int i = 0; i < URL.length(); i++) {char c = URL[i];if (c != '%') {result += c;}else {char c1 = URL[++i];char c0 = URL[++i];int num = 0;num += hexChar2dec(c1) * 16 + hexChar2dec(c0);result += char(num);}}return result;}
以上这篇C++ 写的UrlEncode和UrlDecode实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。
我知道按攻略去旅行的人往往玩得过于按步就班，
