protobuf

1.下载protobuf

#wget -c https://github.com/protocolbuffers/protobuf/releases/download/v3.7.1/protobuf-cpp-3.7.1.tar.gz

或者百度网盘下载protobuf3.7.1 提取码: wfu5

下载后,解压文件protobuf-cpp-3.7.1.tar.gz,在解压得到的protobuf-3.7.1目录下执行以下命令,--prefix指定安装的根目录

$ ./configure --prefix=/usr/local

$ make

$ make check

$ sudo make install

# ldconfig

2. 测试

person.proto

syntax = "proto3";

package person;
message Person{
    string id=1;
    string name=2;
    string addr = 3;
    string test = 1000;
}

//protoc --cpp_out=. person.proto

/*!
* Auth: xor
* Date: 2019-6-9
* File: personWrite.cpp
* Class: %{Cpp:License:ClassName} (if applicable)
* Brief:
* Note:
 */
#include "person.pb.h"
#include <iostream>
#include <fstream>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string>
#include <unistd.h>

using namespace std;
using namespace person;

int main(int argc,char **argv){
    person::Person person;
    person.set_id("111");
    person.set_name("China");
    person.set_addr("Aisa");
    person.set_test("ttttt");

    // serialize
    string output = "";
    if(!person.SerializeToString(&output))
    {
        perror("failed to write person.
");
        return -1;
    }

    cout << "output:" << output << endl;

    // serialize data to file
    fstream os("./person.info", ios::out | ios::trunc | ios::binary);
    if(!person.SerializeToOstream(&os))
    {
        perror("failed to write person");
        return -1;
    }
    printf("hello world!
");
    return 0;
}

// g++11 personWrite.cpp person.pb.cc -o xpW -lprotobuf -lpthread

#include "person.pb.h"
#include <iostream>
#include <fstream>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string>
#include <unistd.h>

using namespace std;
using namespace person;

int main(int argc,char **argv){
    person::Person person;
    int fd = open("./person.info", O_EXCL);
    assert(fd > 0);

    if(!person.ParseFromFileDescriptor(fd))
    {
        perror("failed to parse msg");
        return -1;
    }

    cout << "output:" << person.id() << " name:" << person.name() << " addr:" << person.addr() << " test:" << person.test() << endl;

    printf("hello world!
");
    return 0;
}

// g++11 personRead.cpp person.pb.cc -o xpR -lprotobuf -lpthread