message Configure{    required string host = 1;    required uint32 port = 2;}

Configure config;

config.set_host("127.0.0.1");
config.set_port(8080);

string contect;google::protobuf::TextFormat::PrintToString(config, & contect);

ofstream fout;fout.open("config.cfg", ios::out| ios_base::ate);if (!fout.is_open()){    fprintf(stderr, "open config.cfg fail\n");    return -1;}fout << contect <<endl;fout.flush();fout.close();

int fd = open("config.cfg", O_RDONLY);if (fd < 0){    printf("open config.cfg failure:%s \n",strerror(errno));    return false;}google::protobuf::io::FileInputStream fileInput(fd);fileInput.SetCloseOnDelete(true);google::protobuf::TextFormat::Parse(&fileInput, &config);