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 string转utf8编码：

std::string string_To_UTF8(const std::string & str)
{ 
	int nwLen = ::MultiByteToWideChar(CP_ACP, 0, str.c_str(), -1, NULL, 0);

	wchar_t * pwBuf = new wchar_t[nwLen + 1];//一定要加1，不然会出现尾巴
	ZeroMemory(pwBuf, nwLen * 2 + 2);
	::MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.length(), pwBuf, nwLen);
	int nLen = ::WideCharToMultiByte(CP_UTF8, 0, pwBuf, -1, NULL, NULL, NULL, NULL);
	char * pBuf = new char[nLen + 1];
	ZeroMemory(pBuf, nLen + 1);
	::WideCharToMultiByte(CP_UTF8, 0, pwBuf, nwLen, pBuf, nLen, NULL, NULL);
	std::string retStr(pBuf);
	delete []pwBuf;
	delete []pBuf;
	pwBuf = NULL;
	pBuf = NULL;

	return retStr;
}

字符串替换：

std::string subreplace(std::string resource_str, std::string sub_str, std::string new_str)
{
	std::string dst_str = resource_str;
	std::string::size_type pos = 0;
	while ((pos = dst_str.find(sub_str)) != std::string::npos)   //替换所有指定子串
	{
		dst_str.replace(pos, sub_str.length(), new_str);
	}
	return dst_str;
}