protobuf版本

protobuf/3.11.3

Person.proto

syntax = "proto3";

package test;

//枚举定义
enum SexEnum{
    MAN=0;
    WOMAN=1;
}

//消息
message Person{
    string name=1;
    optional SexEnum sex=2;
    uint32 age=3;
    repeated Address myAddress=4;
    string brithday=5;
    bool status=6;
    string picture=7;
    repeated bytes image=8;
}

//消息
message Address{
    string desc=1;
    optional string cityCode=2;
}

将proto结构描述模板生成C++代码

protoc -I=. --cpp_out=. Person.proto

C++的protobuf序列化

Person *p1=new Person;
p1->set_age(121212);
p1->set_sex(MAN);
p1->set_image("asdasd");
p1->set_brithday("2020-01-1");
p1->set_name("zhangsan");
p1->set_status(true);
p1->set_picture("1.png");
Address *ad=p1->add_myaddress();
ad->set_citycode("430321");
ad->set_desc("xiangtanshi");
//读取图片
FILE *readImageFd=fopen("d:\\1.png","rb");
fseek(readImageFd,0,SEEK_END);
int imageSize=ftell(readImageFd);
fseek(readImageFd,0,SEEK_SET);
char *imageBuffer=new char[imageSize];
fread(imageBuffer,1,imageSize,readImageFd);
fclose(readImageFd);
string image_data;
//图片的二进制数据绑定到string对象中
image_data.assign(imageBuffer,imageSize);
p1->set_image(image_data);
delete []imageBuffer;
//将对象序列化成文件
fstream  output1("./1.pb",ios::binary|ios::out);
p1->SerializeToOstream(&output1);
delete p1;
output1.close();

C++的protobuf反序列化

//读取文件
fstream inputstream("./1.pb",ios::in|ios::binary);
inputstream.seekg (0, inputstream.end);
int length = inputstream.tellg();
inputstream.seekg (0, inputstream.beg);
char *pdbuffer=new char[length];
inputstream.read(pdbuffer,length);
inputstream.close();

Person *p1=new Person();
//将二进制数据反序列化到person对象中
p1->ParseFromArray(pdbuffer,length);
std::cout  << "name=" << p1->name() << std::endl;
std::cout  << "age=" << p1->age() << std::endl;
std::cout  << "sex=" << p1->sex() << std::endl;
std::cout  << "status=" << p1->status() << std::endl;
std::cout  << "picture=" << p1->picture() << std::endl;
std::cout  << "address=" << "city" << p1->myaddress(0).desc() << "=" << p1->myaddress(0).citycode() << std::endl;

//将person对象中的图片输出成文件
fstream outputStream("./1.png",ios::binary|ios::out);
outputStream.write(p1->image().data(),p1->image().size());
outputStream.close();