在c++中使用protubuf3，socket的demo_c++ 使用protobuf3

安装
https://www.jianshu.com/p/ea1cdd33f2b3

也可

sudo apt-get install protobuf-c-compiler protobuf-compiler
protoc --version

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msg.proto

syntax = "proto3";
package tutorial;
message Person {
   
  string name = 1;
  int32 id = 2;  // Unique ID number for this person.
  string email = 3;
}
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编译

/usr/local/bin/protoc  -I=./   --cpp_out=./   msg.proto 
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生成
msg.pb.h，msg.pb.cc

server.cpp
使用 ParseFromString 接口

#include<stdio.h>
#include<stdlib.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<string.h>
#include<string>
#include<iostream>

#include"msg.pb.h"
using namespace std;
#define SIZE 300

int main(int argc,char *argv[])
{
   
        int server_sock,client_sock,r;
        struct sockaddr_in server_addr,client_addr;
        socklen_t len;
        char buf[SIZE];
        if(argc!=2)
        {
   
                printf("need port\n");
                return 1;
        }
        int port = atoi(argv[1]);
        server_sock = socket(AF_INET,SOCK_STREAM,0);
        memset(&server_addr,0,sizeof server_addr);
        server_addr.sin_family=AF_INET;
        server_addr.sin_addr.s_addr=inet_addr("0.0.0.0");//htonl(INADDR_ANY)
        server_addr.sin_port=htons(port)
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