protobuf c++ 笔记

sudo apt-get install autoconf automake libtool curl #安装工具
git clone https://github.com/google/protobuf #下载源码

curl $curlopts -O https://googlemock.googlecode.com/files/gmock-1.7.0.zip

./autogen.sh
./configure
make
make check
sudo make install
sudo ldconfig # refresh shared library cache.

//person.proto
message Person{
    required string name = 1;
    required uint32 age = 2;
    optional string country = 3;
}

protoc --cpp_out=./ person.proto

#include <iostream>
#include <fstream>
#include "person.pb.h"

using namespace std;

int main()
{
    GOOGLE_PROTOBUF_VERIFY_VERSION;
    Person p;
    p.set_name("Andy");
    p.set_age(40);
    p.set_country("China");

    {
        cout<<"Save Data"<<endl;
        fstream output("data",ios::out|ios::trunc | ios::binary);
        if(!p.SerializeToOstream(&output)){
            cerr << "Failed to save"<<endl;
            return -1;
        }else{
            cout<<"Save OK"<<endl;
        }
    }

    {
        cout<<"Read Data"<<endl;
        Person p1;
        fstream input("data",ios::in | ios::binary);
        if(!p1.ParseFromIstream(&input)){
            cerr<<"Failed to read"<<endl;
            return -1;
        }

        cout<<"name:"<<p1.name()<<endl;
        cout<<"age:"<<p1.age()<<endl;
        cout<<"country:"<<p1.country()<<endl;
    }

    return 0;
}

All: person.pb.cc main.cpp
    pkg-config --cflags protobuf # fails if protobuf is not installed
    g++ person.pb.cc main.cpp -I. -I../protobuf-master/src -o Demo `pkg-config --cflags --libs protobuf`

make
./Demo