ProtoBuf练习（五）

表类型

protobuf语言的maps字段类型相当于C++语言的std::map类型

工程目录结构

1$ ls proto/
2sample_maps.proto

proto文件

1$ cat proto/sample_maps.proto
2syntax = "proto3";
3
4message home
5{
6    string addr = 1;
7}
8
9message sample_maps
10{
11    map<int32, string> ids = 1;
12    map<string, home> infos = 2;
13}

读写源文件

1$ cat reader.cpp
2#include <fstream>
3#include <iostream>
4#include "sample_maps.pb.h"
5
6using namespace std;
7
8int main(int argc, char *argv[])
9{
10    fstream input("./log", ios::in | ios::binary);
11    cout << "Deserialize start." << endl;
12
13    sample_maps m;
14    if (!m.ParseFromIstream(&input))
15    {
16        cout << "Deserialize failed." << endl;
17        return -1;
18    }
19    
20    auto ids = m.ids();
21    for (auto iter = ids.cbegin(); iter != ids.cend(); iter++)
22        cout << iter->first << " : " << iter->second << endl; 
23    
24    auto infos = m.infos();
25    for (auto iter = infos.cbegin(); iter != infos.cend(); iter++)
26        cout << iter->first << " : " << iter->second.DebugString(); 
27
28    cout << "Deserialize end." << endl;
29    input.close();
30    return 0;
31}
32
33$ cat writer.cpp
34#include <fstream>
35#include <iostream>
36#include "sample_maps.pb.h"
37
38using namespace std;
39
40int main(int argc, char *argv[])
41{
42    sample_maps m;
43    auto ids_ptr = m.mutable_ids();
44    (*ids_ptr)[1] = "fwd";
45    (*ids_ptr)[2] = "xb";
46
47    auto infos_ptr = m.mutable_infos();
48    home h;
49    h.set_addr("nj");
50    (*infos_ptr)["fwd"] = h;
51
52    fstream output("./log", ios::out | ios::trunc | ios::binary); 
53    cout << "Serialize start." << endl;
54    if (!m.SerializeToOstream(&output))
55        {
56                cout << "Serialize failed." << endl;
57                return -1;
58        }
59    output.close();
60    cout << "Serialize end." << endl;
61    return 0;
62}