protobuf any 的操作c++

https://blog.csdn.net/u012662731/article/details/88077828

person.proto

syntax = "proto3";                 
import "google/protobuf/any.proto";
message Apply_data
{
    
    
    uint32 apply_data_id = 1;
    uint64 apply_time = 2;
}
message Apply_list
{
    
    
    uint32 apply_list_id = 1;
}
message Test
{
    
    
    int32                   id = 1;
    google.protobuf.Any     data = 2;
}

main.cpp

#include <iostream>
#include "person.pb.h"
#include "MsgHead.h"
#include <google/protobuf/any.h>
#include <google/protobuf/any.pb.h>
using namespace std;
typedef google::protobuf::Message GPMessage;
typedef google::protobuf::Any Any;

void checkAny(const Test& test) {
    
    
    if (!test.has_data()) {
    
    
        cout << "not has_data" << endl;
        return ;
    }

    Apply_data data1;
    Apply_list list1;
    //判断是否是和发的proto any
    //if (!test.mutable_data()->UnpackTo(&data1)) {
    
    
    if (test.data().Is<Apply_data>()) {
    
    
        //解析
        if (test.data().UnpackTo(&data1)) {
    
    
            cout << data1.apply_data_id() << endl;
            cout << "unpackTo data success" << endl;
        } else {
    
    
            cout << "unpackTo data error" << endl;
        }
    } else {
    
    
        cout << "is not apply_data" << endl;
    }

    if (test.data().Is<Apply_list>()) {
    
    
         //解析
        if (test.data().UnpackTo(&list1)) {
    
    
            cout << list1.apply_list_id() << endl;
            cout << "unpackTo list success" << endl;
        } else {
    
    
            cout << "unpackTo list error" << endl;;
        }
    } else {
    
    
        cout << "is not apply_list" << endl;
    }
}

int main() {
    
    
    Test test;
    Apply_data data;
    data.set_apply_data_id(111);
    Apply_list list;
    list.set_apply_list_id(222);
    //设置any数据
    cout << "set apply_data data:" << endl;
    test.mutable_data()->PackFrom(data);
    //找到any数据 解析
    checkAny(test);
    //----------------------

 

    //设置any数据

    cout << "set apply_list data:" << endl;
    test.mutable_data()->PackFrom(list);
    //找到any数据 解析
    checkAny(test);
    //----------------------
    //清空
    cout << "clear data:" << endl;
    test.clear_data();
    checkAny(test);
    return  0;
}

make:

protoc --cpp_out=./ *.proto
g++ -o main  main.cpp person.pb.cc -lprotobuf -std=c++11 -g -lpthread

运行结果：

set apply_data data:
111
unpackTo data success
is not apply_list
set apply_list data:
is not apply_data
222
unpackTo list success
clear data:
not has_data

个人感觉有点像模版，下一篇介绍any源码的实现，看本质是不是模板。