Ggoogle Protocol Buffer的使用 (基于C++语言)

1 #include<iostream>                                                                                                                         
  2 #include<fstream>
  3 #include<string>
  4 $include "tutorial.addressbook.pb.h"
  5 using namespace std;
  6 
  7 //定义一个函数,用于设置person对象的值;
  8 //参数为: 一个person 对象的指针; 返回为空;
  9 void PromptForAddress(tutorial::Person* person) {
 10         cout << "Enter person ID number :";
 11         int id;
 12         cin >> id;
 13         person->set_id(id);
 14         cin.ignore(256, ‘\n‘)       //作用:用于清除缓冲区的内容,防止对下次输入产生影响.
 15 
 16         cout << "Enter name: ";
 17         getline(cin, *person->mutable_name()); //mutable_name()返回一个指针,再加上*,要干什么?看来要补补getline()函数了;
 18         
 19         cout<< "Enter email address(blank for none): ";
 20         string email;
 21         getline(cin, email);
 22         if (!email.empty()) {
 23                 person->set_email(email);
 24         }
 25 
 26         while (true) {
 27                 cout << "Enter a phone number (or leave blank to finish): ";
 28                 string number;
 29                 getline(cin, number);
 30                 if (number.empty()) {
 31                         break;
 32                 }
 33 
 34 
 35         tutorial::Person::PhoneNumber* phone_number = person->add_phone();
 36         phone_number->set_number(number);
 37 
 38         cout <<"Is this a mobile, home, or work phone? ";
 39         string type;
 40         getline(cin, type);
 41         if (type == "mobile") {
 42                 phone_number->set_type(tutorial::Person::MOBILE);
 43         } else if (type == "home") {
 44                 phone_number->set_type(tutorial::Person::HOME);
 45         } else if (type =="work") {
 46                 phone_number->set_type(tutorial::Person::WORK);
 47         } else {
 48                 cout << "Unknown phone type. Using  default." <<endl;
 49         }
 50         }
 51 }
 52 
 53 
 54 int main(int argc, char* argv[]) {
 55         GOOGLE_PROTOBUF_VERIFY_VERSION; //这是一个宏命令,用于检查看看用的protobuf的库是否兼容;最好加上它;
 56 
 57         if (argc !=2) {
 58                 cerr << "Usage: " << argv[0] << "ADDRESS_BOOK_FILＥ"　<<　endl;
 59                 return -1;
 60         }
 61 
 62 tutorial::AddressBook address_book;
 63 
 64 //读文件,如果不存在,就创建;
 65 fstream input(argv[1], ios::in | ios::binary);
 66 if (!input) {
 67         cout << argv[1] << ":File not found, Creating a new file." <<endl;
 68 } else if (!address_book.ParseFromeIstream(&input)) {
 69         cerr << "Failed to parse address book." << endl;
 70         return -1;
 71 }
 72 
 73 //增加address;
 74 PromptForAddress(address_book.add_person());
 75 
 76 //写放盘中;
 77 fstream output(argv[1], ios::out | ios::trunc | ios::binary);
 78 if (!address_book.SerializeToOstream(&output)) {
 79         cerr << "Failed to write address book." << endl;
 80         return -1;
 81 }                     
 82 
 83 //用于把全局的由libprotobuf申请的对象空间;
 84 google::protobuf::ShutdownProtobufLibrary();
 85 
 86 return 0;
 87 }

#include <iostream>
#include <fstream>
#include <string>
#include "addressbook.pb.h"
using namespace std;

// Iterates though all people in the AddressBook and prints info about them.
void ListPeople(const tutorial::AddressBook& address_book) {
  for (int i = 0; i < address_book.person_size(); i++) {
    const tutorial::Person& person = address_book.person(i);

    cout << "Person ID: " << person.id() << endl;
    cout << "  Name: " << person.name() << endl;
    if (person.has_email()) {
      cout << "  E-mail address: " << person.email() << endl;
    }

    for (int j = 0; j < person.phone_size(); j++) {
      const tutorial::Person::PhoneNumber& phone_number = person.phone(j);

      switch (phone_number.type()) {
        case tutorial::Person::MOBILE:
          cout << "  Mobile phone #: ";
          break;
        case tutorial::Person::HOME:
          cout << "  Home phone #: ";
          break;
        case tutorial::Person::WORK:
          cout << "  Work phone #: ";
          break;
      }
      cout << phone_number.number() << endl;
    }
  }
}

// Main function:  Reads the entire address book from a file and prints all
//   the information inside.
int main(int argc, char* argv[]) {
  // Verify that the version of the library that we linked against is
  // compatible with the version of the headers we compiled against.
  GOOGLE_PROTOBUF_VERIFY_VERSION;

  if (argc != 2) {
    cerr << "Usage:  " << argv[0] << " ADDRESS_BOOK_FILE" << endl;
    return -1;
  }

  tutorial::AddressBook address_book;

  {
    // Read the existing address book.
    fstream input(argv[1], ios::in | ios::binary);
    if (!address_book.ParseFromIstream(&input)) {
      cerr << "Failed to parse address book." << endl;
      return -1;
    }
  }

  ListPeople(address_book);

  // Optional:  Delete all global objects allocated by libprotobuf.
  google::protobuf::ShutdownProtobufLibrary();

  return 0;
}

message SongServerRequest {
  required string song_name = 1;
}

enum Foo {
  FIRST_VALUE = 1;
  SECOND_VALUE = 2;
}