Introduction

Learning about Google Protocol Buffer before bed

Installing the protobuf compiler

Start the latest Ubuntu Docker image, run apt install protobuf-compiler

Writing a .proto file

nano lm.helloworld.proto

Then input:

package lm; 
message helloworld 
{ 
   required int32     id = 1;  // ID 
   required string    str = 2;  // str 
   optional int32     opt = 3;  //optional field 
}

In the example above, the package name is lm, and a message called helloworld is defined. This message has three members: an int32 type id, a string type member str. opt is an optional member, meaning the message may not contain this member.

Compiling the proto file