静态使用protobuf

一、静态使用proto文件步骤

1、创建proto文件 addressbook.proto

2、使用protoc编译器将proto文件编译成C++代码

编译命令格式：protoc -I=$SRC_DIR --cpp_out=$DST_DIR /path/to/file.proto
列如：protoc -I=. --cpp_out=. addressbook.proto

3、编写操作proto文件对应的C++程序

4、编译C++程序

g++ -std=c++11 addressbook.pb.cc main.cc -o main -lprotobuf（编译没有问题，运行报错,原因未知）
g++ -std=c++11 addressbook.pb.cc main.cc -o main -lprotobuf -lpthread（编译和运行都正常）
例如:example01

// Filename: addressbook.proto

syntax="proto2";
package addressbook;

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_info = 1;
}

//main.cc
#include <iostream>
#include "addressbook.pb.h"

int main(int argc, const char* argv[])
{
    addressbook::AddressBook person;
    addressbook::Person* pi = person.add_person_info();

    pi->set_name("aut");
    pi->set_id(1219);
    std::cout << "before clear(), id = " << pi->id() << std::endl;
    pi->clear_id();
    std::cout << "after  clear(), id = " << pi->id() << std::endl;
    pi->set_id(1087);
    if (!pi->has_email())
        pi->set_email("autyinjing@126.com");

    addressbook::Person::PhoneNumber* pn = pi->add_phone();
    pn->set_number("021-8888-8888");
    pn = pi->add_phone();
    pn->set_number("138-8888-8888");
    pn->set_type(addressbook::Person::MOBILE);

    uint32_t size = person.ByteSize();
    unsigned char byteArray[size];
    person.SerializeToArray(byteArray, size);

    addressbook::AddressBook help_person;
    help_person.ParseFromArray(byteArray, size);
    addressbook::Person help_pi = help_person.person_info(0);

    std::cout << "*****************************" << std::endl;
    std::cout << "id:    " << help_pi.id() << std::endl;
    std::cout << "name:  " << help_pi.name() << std::endl;
    std::cout << "email: " << help_pi.email() << std::endl;

    for (int i = 0; i < help_pi.phone_size(); ++i)
    {
        auto help_pn = help_pi.mutable_phone(i);
        std::cout << "phone_type: " << help_pn->type() << std::endl;
        std::cout << "phone_number: " << help_pn->number() << std::endl;
    }
    std::cout << "*****************************" << std::endl;

    return 0;
}