【Protobuf】Python使用Protobuf

1.环境安装

官方文档：https://protobuf.com.cn/overview/

编辑器可以安装一个protobuf协议的插件

写一个test_pro.proto

syntax = "proto3";
package ts;message Pkg{string text = 1;int32 length = 2;string name = 3;message Information{string address = 1;string location = 2;}repeated Information info = 4;
}

下载protoc，文件转代码

Releases · protocolbuffers/protobuf

我们下载protoc 34.1我用的是win64

解压后，将目标文件夹/bin 配置到系统环境变量

尝试一下使用命令

protoc --version

出现

libprotoc 34.1

接下来可以使用命令将其编译成python代码

protoc --python_out=. test_pro.proto

会出现一个新的文件叫test_pro_pb2.py

先安装protobuf库

pip install protobuf

运行程序，完成

Process finished with exit code 0

运行程序，出现报错,说明这个pip版本比编译器的版本低，要换编译器版本

google.protobuf.runtime_version.VersionError: Detected incompatible Protobuf Gencode/Runtime versions when loading test_pro.proto: gencode 7.35.0-rc1 runtime 7.34.1. Runtime version cannot be older than the linked gencode version. See Protobuf version guarantees at https://protobuf.dev/support/cross-version-runtime-guarantee.

运行示例

现在编写代码

from test_pro_pb2 import Pkg
from google.protobuf import json_format
import gzipp = Pkg()
p.text = 'hello world'
p.length = 16
p.name = 'hw'info = p.info.add()
info.address = "gdsjys001"
info.location = "jhwg11"info2 = Pkg.Information()
info2.address = "gdsjys002"
info2.location = "jhwg22"
p.info.append(info2)encode = p.SerializeToString()
print(encode)#ParseFromString() 是原地修改方法，返回 None，解析结果在调用对象自身。
p1 = Pkg()
decode = p1.ParseFromString(encode)
print(p1)

运行

b'\n\x0bhello world\x10\x10\x1a\x02hw"\x13\n\tgdsjys001\x12\x06jhwg11"\x13\n\tgdsjys002\x12\x06jhwg22'
text: "hello world"
length: 16
name: "hw"
info {address: "gdsjys001"location: "jhwg11"
}
info {address: "gdsjys002"location: "jhwg22"
}