00. 目錄

文章目錄

• • 00. 目錄
  • 01. 消息格式
  • 02. 參考程序
  • 03. 編譯測試
  • 04. 附錄

01. 消息格式

info.proto文件內(nèi)容如下：

syntax = "proto3";//指定版本信息，不指定會報錯package infopack; //package聲明符message info //message為關(guān)鍵字，作用為定義一種消息類型 {string addr = 1; //地址string group = 2; //分組 }

addressbook.proto文件內(nèi)容如下，addressbook.proto文件需要導(dǎo)入info.proto文件的內(nèi)容：

syntax = "proto3";//指定版本信息，不指定會報錯import "info.proto"; //導(dǎo)入定義package tutorial; //package聲明符message Person //message為關(guān)鍵字，作用為定義一種消息類型 {string name = 1; //姓名int32 id = 2; //idstring email = 3; //郵件enum PhoneType //枚舉消息類型{MOBILE = 0; //proto3版本中，首成員必須為0，成員不應(yīng)有相同的值HOME = 1;WORK = 2;}message PhoneNumber{string number = 1;PhoneType type = 2;}repeated PhoneNumber phones = 4; //phones為數(shù)組//info定義在"info.proto"//類型格式：包名.信息名infopack.info tmp = 5; }message AddressBook {repeated Person people = 1; }

02. 參考程序

#include "addressbook.pb.h" #include <iostream> #include <fstream> using namespace std;void set_addressbook() {tutorial::AddressBook obj;tutorial::Person *p1 = obj.add_people(); //新增加一個Personp1->set_name("tom");p1->set_id(1);p1->set_email("tom@qq.com");tutorial::Person::PhoneNumber *phone1 = p1->add_phones(); //增加一個phonephone1->set_number("110");phone1->set_type(tutorial::Person::MOBILE);tutorial::Person::PhoneNumber *phone2 = p1->add_phones(); //增加一個phonephone2->set_number("120");phone2->set_type(tutorial::Person::HOME);//info addr和group的使用infopack::info *p_info = p1->mutable_tmp(); //取出info的對象指針p_info->set_addr("China"); //地址p_info->set_group("A"); //組fstream output("pb.itcast", ios::out | ios::trunc | ios::binary);bool flag = obj.SerializeToOstream(&output);//序列化if (!flag){cerr << "Failed to write file." << endl;return;}output.close();//關(guān)閉文件 }void get_addressbook() {tutorial::AddressBook obj;fstream input("./pb.itcast", ios::in | ios::binary);obj.ParseFromIstream(&input); //反序列化input.close(); //關(guān)閉文件for (int i = 0; i < obj.people_size(); i++){const tutorial::Person& person = obj.people(i);//取第i個peoplecout << "第" << i + 1 << "個信息\n";cout << "name = " << person.name() << endl;cout << "id = " << person.id() << endl;cout << "email = " << person.email() << endl;for (int j = 0; j < person.phones_size(); j++){const tutorial::Person::PhoneNumber& phone_number = person.phones(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;}//info addr和group的使用infopack::info info = person.tmp(); //取出info的對象cout << "addr = " << info.addr() << endl;cout << "group = " << info.group() << endl;cout << endl;} }int main() {// 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;set_addressbook(); //序列化get_addressbook(); //反序列化// Optional: Delete all global objects allocated by libprotobuf.google::protobuf::ShutdownProtobufLibrary();return 0; }

03. 編譯測試

deng@itcast:/mnt/hgfs/LinuxHome/day03$ protoc addressbook.proto info.proto --cpp_out=./ deng@itcast:/mnt/hgfs/LinuxHome/day03$ ./a.out 第1個信息 name = tom id = 1 email = tom@qq.comMobile phone #: 110Home phone #: 120deng@itcast:/mnt/hgfs/LinuxHome/day03$

04. 附錄

測試程序下載：

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