ProtoBuf练习
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其中一个类型
protobuf语言的oneof字段类型相当于C++语言的联合数据类型
工程目录结构
$ ls proto/
sample_oneof.proto
proto文件
$ cat proto/sample_oneof.proto
syntax = "proto3";
message sample_oneof
{
oneof oneof_name
{
int32 foo_int = 1;
string foo_string = 2;
}
}
读写源文件
$ cat reader.cpp
#include <fstream>
#include <iostream>
#include "sample_oneof.pb.h"
using namespace std;
int main(int argc, char *argv[])
{
fstream input("./log", ios::in | ios::binary);
cout << "Deserialize start." << endl;
sample_oneof s;
if (!s.ParseFromIstream(&input))
{
cout << "Deserialize failed." << endl;
return -1;
}
switch (s.oneof_name_case())
{
case sample_oneof::OneofNameCase::kFooInt:
cout << "Int:" << s.foo_int() << endl;
break;
case sample_oneof::OneofNameCase::kFooString:
cout << "String:" << s.foo_string() << endl;
break;
default:
cout << "ONEOF_NAME_NOT_SET" << endl;
break;
}
cout << "Deserialize end." << endl;
input.close();
return 0;
}
$ cat writer.cpp
#include <fstream>
#include <iostream>
#include "sample_oneof.pb.h"
using namespace std;
int main(int argc, char *argv[])
{
sample_oneof s;
s.set_foo_string("sample union");
fstream output("./log", ios::out | ios::trunc | ios::binary);
cout << "Serialize start." << endl;
if (!s.SerializeToOstream(&output))
{
cout << "Serialize failed." << endl;
return -1;
}
output.close();
cout << "Serialize end." << endl;
return 0;
}
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