Google Protocol Buffer 使用入门

首先在Linux下安装protobuf，然后开始使用

//my.proto
syntax = "proto2";
package my;
message helloworld 
{ 
   required int32     id = 1;  // ID 
   required string    str = 2;  // str 
   optional int32     opt = 3;  //optional field 
}

//reader.cpp
#include
#include
#include
#include "my.pb.h"
using namespace std;

void ListMsg(const my::helloworld & msg) { 
  cout << msg.id() << endl; 
  cout << msg.str() << endl; 
} 
  
int main(int argc, char* argv[]) { 
 
  my::helloworld msg1; 
  
  { 
    fstream input("./hhh.txt", ios::in | ios::binary); 
    if (!msg1.ParseFromIstream(&input)) { 
      cout << "Failed to parse address book." << endl; 
      return -1; 
    } 
  } 
  
  ListMsg(msg1); 
  return 0;
}

//writer.cpp
#include
#include
#include
#include "my.pb.h"
using namespace std;
 
int main()
{
    string str = "hello";
  my::helloworld msg1; 
  msg1.set_id(101); 
  msg1.set_str(str); 
  // Write the new address book back to disk. 
  fstream output("hhh.txt", ios::out | ios::trunc | ios::binary); 
  cout<<"hhh"< 
二、编译 
protoc --proto_path=. --cpp_out=. my.proto
g++ my.pb.cc reader.cpp -o read -lprotobuf -std=c++11 -lpthread
g++ my.pb.cc writer.cpp -o writer -lprotobuf -std=c++11 -lpthread
 
现在文件夹下的文件如图：
 
 
 
三、运行 
 
四、原理参考 
Protobuf序列化原理_钟离默的博客-CSDN博客
 
Encoding  |  Protocol Buffers  |  Google Developers
 
Protobuf 使用介绍及原理: Protobuf 使用介绍及原理 (gitee.com)
 
 
 
 
 
参考：C++ Generated Code  |  Protocol Buffers  |  Google Developers