用VC（MFC）实现ASP中的Server.URLEncode与URLDecode
今天做程序因为要用到UrlEncode和UrlDecode，所以到网上找了一下，想用个现成的。找来找去，发现郑昀老师的代码思路是最清晰的，也很和胃口，但可惜的是只有一半 —— UrlEncode()，又看了看其他人写的，都不怎么样。所以一咬牙，干脆自己动手把UrlDecode()补上了，再做成头文件，以后用起来也方便（懒人啦）。看见还有很多人搜索，所以贴出来一份给其他懒人。代码如下：inline BYTE toHex(const BYTE &x){
return x > 9 ? x + 55: x + 48;
}
inline BYTE toByte(const BYTE &x)
{
return x > 57? x - 55: x - 48;
}
CString URLDecode(CString sIn)
{
CString sOut;
const int nLen = sIn.GetLength() + 1;
register LPBYTE pOutTmp = NULL;
LPBYTE pOutBuf = NULL;
register LPBYTE pInTmp = NULL;
LPBYTE pInBuf =(LPBYTE)sIn.GetBuffer(nLen);
//alloc out buffer
pOutBuf = (LPBYTE)sOut.GetBuffer(nLen);if(pOutBuf)
{
pInTmp = pInBuf;
pOutTmp = pOutBuf;
// do encoding
while (*pInTmp)
{
if('%'==*pInTmp)
{
pInTmp++;
*pOutTmp++ = (toByte(*pInTmp)%16<<4) + toByte(*(pInTmp+1))%16;//高4位+低4位
pInTmp++;
}
else if('+'==*pInTmp)
*pOutTmp++ = ' ';
else
*pOutTmp++ = *pInTmp;
pInTmp++;
}
*pOutTmp = '\0';
sOut.ReleaseBuffer();
}
sIn.ReleaseBuffer();return sOut;
}
CString URLEncode(CString sIn)
{
CString sOut;
const int nLen = sIn.GetLength() + 1;
register LPBYTE pOutTmp = NULL;
LPBYTE pOutBuf = NULL;
register LPBYTE pInTmp = NULL;
LPBYTE pInBuf =(LPBYTE)sIn.GetBuffer(nLen);
//alloc out buffer
pOutBuf = (LPBYTE)sOut.GetBuffer(nLen*3);if(pOutBuf)
{
pInTmp = pInBuf;
pOutTmp = pOutBuf;
// do encoding
while (*pInTmp)
{
if(isalnum(*pInTmp) || '-'==*pInTmp || '_'==*pInTmp || '.'==*pInTmp)
*pOutTmp++ = *pInTmp;
else if(isspace(*pInTmp))
*pOutTmp++ = '+';
else
{
*pOutTmp++ = '%';
*pOutTmp++ = toHex(*pInTmp>>4);//高4位
*pOutTmp++ = toHex(*pInTmp%16);//低4位
}
pInTmp++;
}
*pOutTmp = '\0';
sOut.ReleaseBuffer();
}
sIn.ReleaseBuffer();return sOut;
}
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