Windows C++ Url编码

在windows平台下，对url进行utf-8编码，相关代码如下：

CString UrlUTF8(char *str)
{
	CString strResult = "";
	string tt;
	string dd;
	GB2312ToUTF_8(tt,str,(int)strlen(str));

	size_t len=tt.length();
	for (size_t i=0;i>4,((BYTE)tt.at(i)) %16);
			dd.append(tempbuff);
		}

	}
	strResult = dd.c_str();
	return strResult;
}

void GB2312ToUTF_8(string& pOut,char *pText, int pLen)
{
	char buf[4];
	memset(buf,0,4);
	pOut.clear();
	int i = 0;
	while(i < pLen)
	{
		//如果是英文直接复制就可以
		if( pText[i] >= 0)
		{
			char asciistr[2]={0};
			asciistr[0] = (pText[i++]);
			pOut.append(asciistr);
		}
		else
		{
			WCHAR pbuffer;
			Gb2312ToUnicode(&pbuffer,pText+i);
			UnicodeToUTF_8(buf,&pbuffer);
			pOut.append(buf);
			i += 2;
		}
	}
	return;
}

void Gb2312ToUnicode(WCHAR* pOut,char *gbBuffer)
{
	::MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,gbBuffer,2,pOut,1);
	return;
}

void UnicodeToUTF_8(char* pOut,WCHAR* pText)
{
	// 注意 WCHAR高低字的顺序,低字节在前，高字节在后
	char* pchar = (char *)pText;
	pOut[0] = (0xE0 | ((pchar[1] & 0xF0) >> 4));
	pOut[1] = (0x80 | ((pchar[1] & 0x0F) << 2)) + ((pchar[0] & 0xC0) >> 6);
	pOut[2] = (0x80 | (pchar[0] & 0x3F));
	return;
}