vc根据ip改host文件

//参数ip
void configservice::save_ip_domain_host(std::string ip)
{
	std::stringstream ss;	
	std::string domain = "glscsmp.com";
	std::string  ipdomain = ip + " " + domain + "\n";
	std::string hostfile = "C:\\Windows\\System32\\drivers\\etc\\hosts";
	std::ifstream inf(hostfile, ios_base::in);
	bool find = false;
	if (inf.is_open())
	{
		
		std::string line;
		while (std::getline(inf, line))
		{
			if (line.find(domain) != std::string::npos)
			{
				find = true;
				ss << ipdomain;
			}
			else
			{
				ss << line << "\n";
			}
		}
		inf.close();
		if (!find)
		{
			ss << ipdomain;
		}
		std::string outstr = ss.str();	
		std::ofstream ofs(hostfile, ios_base::out);
		if (ofs.is_open())
		{
			ofs << outstr;
			ofs.close();
		}
	}
}
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