protobuf示例

hideto

1, 下载compiler和源代码
http://code.google.com/p/protobuf/downloads/

build protobuf:
./configuremakemake checkmake install

2, 创建一个addressbook.proto
package tutorial;message Person {  required string name = 1;  required int32 id = 2;  optional string email = 3;    enum PhoneType {    MOBILE = 0;    HOME = 1;    WORK = 2;  }    message PhoneNumber {    required string number = 1;    optional PhoneType type = 2 [default = HOME];  }    repeated PhoneNumber phone = 4; }message AddressBook {  repeated Person person = 1;}

3, 生成C++的stub
protoc --cpp_out=. ./addressbook.proto
运行上面的命令将生成addressbook.pb.h和addressbook.pb.cc

4, 写
// write.cc#include <iostream>#include <fstream>#include <string>#include "addressbook.pb.h"using namespace std;void PromptForAddress(tutorial::Person* person) {cout << "Enter person ID number: ";int id;cin >> id;person->set_id(id);cin.ignore(256, '\n');cout << "Enter name: ";getline(cin, *person->mutable_name());cout << "Enter email address (blank for none): ";string email;getline(cin, email);if (!email.empty()) {person->set_email(email);}while(true) {cout << "Enter a phone number (or leave blank to finish):";string number;getline(cin, number);if (number.empty()) {break;}tutorial::Person::PhoneNumber *phone_number = person->add_phone();phone_number->set_number(number);cout << "Is this a mobile, home, or work phone?";string type;getline(cin, type);if (type == "mobile") {phone_number->set_type(tutorial::Person::MOBILE);} else if (type == "home") {phone_number->set_type(tutorial::Person::HOME);} else {cout << "Unknown phone type. Using default." << endl;}}}int main(int argc, char* argv[]) {GOOGLE_PROTOBUF_VERIFY_VERSION;if(argc != 2) {cerr << "Usage: " << argv[0] << " ADDRESS_BOOK_FILE" << endl;return -1;}tutorial::AddressBook address_book;{fstream input(argv[1], ios::in | ios::binary);if (!input) {cout << argv[1] << ": File not found. Creating a new file." << endl;} else if (!address_book.ParseFromIstream(&input)) {cerr << "Failed to parse address book." << endl;return -1;}}PromptForAddress(address_book.add_person());{fstream output(argv[1], ios::out | ios::trunc | ios::binary);if (!address_book.SerializeToOstream(&output)) {cerr << "Failed to write address book." << endl;return -1;}}google::protobuf::ShutdownProtobufLibrary();return 0;}
编译生成write.exe
注意：
需要将protobuf的源码以及lib加到编译的PATH中

向文件写数据:
write ADDRESS_BOOK_FILEEnter person ID number: 123Enter name: HidetoEnter email address (blank for none): hideto.bj@gmail.comEnter a phone number (or leave blank to finish):159xxxxxxxxIs this a mobile, home, or work phone?mobileEnter a phone number (or leave blank to finish):write ADDRESS_BOOK_FILE// ....

5, 读
// read.cc#include <iostream>#include <fstream>#include <string>#include "addressbook.pb.h"using namespace std;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;        }    }}int main(int argc, char* argv[]) {    GOOGLE_PROTOBUF_VERIFY_VERSION;    if (argc != 2) {        cerr << "Usage: " << argv[0] << "ADDRESS_BOOK_FILE" << endl;        return -1;    }    tutorial::AddressBook 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);    google::protobuf::ShutdownProtobufLibrary();    return 0;}
编译生成read.exe
从文件读数据:
read ADDRESS_BOOK_FILE// 以下为输出Person ID: 123Name: HidetoE-mail address: hideto.bj@gmail.comMobile phone #: 159xxxxxxxxPerson ID: 456Name: chuangE-mail address: chuang@freewheel.tvHome phone #: 22222222Person ID: 1231231Name: asdfadsfE-mail address: fadsfdsf@dasfads.comMobile phone #: 12321321321Home phone #: 123432432

6, Ruby的protobuf库
http://code.google.com/p/ruby-protobuf/
安装:
gem install ruby_protobuf
生成ruby的stub:
rprotoc addressbook.proto
从文件读数据:
# read.rbrequire 'addressbook.pb.rb'def list_people(address_book)  address_book.person.each do | p |    p "Person ID: #{p.id}"    p "Name: #{p.name}"    p "E-mail: #{p.email}" unless p.email.empty?    p.phone.each do |phone|      case phone.type      when Tutorial::Person::PhoneType::MOBILE        print "Mobile phone #: "      when Tutorial::Person::PhoneType::HOME        print "Home phone #: "      when Tutorial::Person::PhoneType::WORK        print "Work phone #: "      end      p phone.number    end  endendaddress_book = Tutorial::AddressBook.newaddress_book.parse_from_file ARGV[0]list_people address_book
运行:
ruby read.rb 'D:\cpp-projects\pb\bin\Release\ADDRESS_BOOK_FILE'// 输出"Person ID: 123""Name: Hideto""E-mail: hideto.bj@gmail.com"Mobile phone #: "159xxxxxxxx""Person ID: 456""Name: chuang""E-mail: chuang@freewheel.tv"Home phone #: "22222222""Person ID: 1231231""Name: asdfadsf""E-mail: fadsfdsf@dasfads.com"Mobile phone #: "12321321321"Home phone #: "123432432"