bool UrlEncode(const string& src, string& dst)
{
	if(src.size() == 0)
		return false;
	char hex[] = "0123456789ABCDEF";
    size_t size = src.size();
    for (size_t i = 0; i < size; ++i)
	{
		unsigned char cc = src[i];
		if (isascii(cc))
		{
			//程式碼這裡沒寫全，這裡只轉碼了空格 / & 這三個字元，實際應用的時候需要補全
			if (cc == ' ')
			{
				dst += "%20";
			}
			else if (cc == '/')
			{
				dst += "%2f";
			}
			else if (cc == '&')
			{
				dst += "%26";
			}
			else
				dst += cc;
		}
		else
		{
			unsigned char c = static_cast<unsigned char>(src[i]);
			dst += '%';
			dst += hex[c / 16];
			dst += hex[c % 16];
		}
	}
	return true;
}

bool UrlDecode(const string& src, string& dst)
{
	if(src.size() == 0)
		return false;
	int hex = 0;
	for (size_t i = 0; i < src.length(); ++i)
	{
		switch (src[i])
		{
			case '+':
				dst += ' ';
				break;
			case '%':
				{
					if (isxdigit(src[i + 1]) && isxdigit(src[i + 2]))
					{
						string hexStr = src.substr(i + 1, 2);
						hex = strtol(hexStr.c_str(), 0, 16);
						//字母和數字[0-9a-zA-Z]、一些特殊符號[$-_.+!*'(),] 、以及某些保留字[$&+,/:;
 
[email protected]]
						//可以不經過編碼直接用於URL
						if (!((hex >= 48 && hex <= 57) || //0-9
						(hex >=97 && hex <= 122) ||   //a-z
						(hex >=65 && hex <= 90) ||    //A-Z
						//一些特殊符號及保留字[$-_.+!*'(),]  [$&+,/:;[email protected]]
						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
						))
						{
							dst += char(hex);
							i += 2;
						}
						else
							dst += '%';
					}
					else
						dst += '%';
				}
				break;
			default:
				dst += src[i];
				break;
		}
	}
	return true;
}