ifstream ifs;
	ifs.open("image_server.conf");
	if(!ifs){
		cerr << "failed to open config file";
		exit(1);
	}
	string line, info;
	while(ifs.eof() == false){
		getline(ifs,line);
		info = line.substr(line.find("="+1));
		if(line.substr(0,line.find("=")) == "LISTEN_PORT")
			LISTEN_PORT = atoi(info.c_str());
		else if(line.substr(0,line.find("=")) == "IMAGE_SAVE_DIR")
			IMAGE_SAVE_DIR = info;
		else if(line.substr(0,line.find("=")) == "LOG_FILE")
			LOG_FILE = info;
	}
	ifs.close();