PROTOBUF Installation and use

Download

git clone https://github.com/google/protobuf.git
CD Protobuf
$./autogen.sh

You may experience the following issues:/autogen.sh:40:autoreconf:not found
workaround: sudo apt-get install autoconf automake libtool

./configure–prefix=/usr
Make
Make check
Make install use

First, define a proto file:

Package LM; 
 Message HelloWorld 
 { 
    required int32     id = 1;  ID 
    Required String    str = 2;  Str 
    optional int32     opt = 3;  Optional field 
 }

Named as: Lm.helloworld.proto
In the current directory of the file, run the following command:

protoc-i=./--cpp_out=./Lm.helloworld.proto

Generate Lm.helloworld.pb.h and lm.helloworld.pb.cc two files, respectively, for the class definition and implementation file.

Second, then use the above two files, create a new write.cpp and Read.cpp file:
Write.cpp

#include "lm.helloworld.pb.h"
#include <iostream>
#include <fstream>

using namespace std;
int main (void)
{
    Lm::helloworld msg1;
    MSG1.SET_ID (101);
    Msg1.set_str ("Hello");

    FStream output ("./log", Ios::out | ios::trunc | ios::binary);

    if (!MSG1. Serializetoostream (&output))
    {
        cerr << "Failed to write Msg." << Endl;
        return-1;
    }
    return 0;
}

Read.cpp

#include "lm.helloworld.pb.h"
#include <iostream>
#include <fstream>

using namespace std ;

int main (void)
{
    Lm::helloworld msg1;
    FStream input ("./log", Ios::in | ios::binary);
    if (!MSG1. Parsefromistream (&input))
    {
        cerr << "Failed to the parse address Book." << Endl;
        return-1;
    }

    cout << msg1.id () << Endl;
    cout << msg1.str () << Endl;
    return 0;
}

Third, compile the above two files

c++ write.cpp Lm.helloworld.pb.cc-lprotobuf-o write C + + read.cpp lm.helloworld.pb.cc- Lprotobuf-o Read