[转]C++URL编码和解码

以下是url中可能用到的特殊字符及在url中的经过编码后的值：
特殊字符的含义

URL编码

#include<iostream>    
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;    
	}    
}    

CString escapeURL(const CString &URL)    
{    
	CString result = "";    
	for ( unsigned int i=0; i<URL.GetLength(); 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;    
}    

CString deescapeURL(const CString &URL) {    
	CString result = "";    
	for ( unsigned int i=0; i < URL.GetLength(); 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;    
}  



void CURlDlg::OnBnClickedOk()
{
	CString str = "小草--";    
	CString temp = escapeURL(str);   
	AfxMessageBox(temp);


}

字符 汉字都会被转换