google protocl buffer 序列化和反序列化的一个例子

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本文介绍了一种使用Google Protocol Buffers进行消息序列化和反序列化的具体实现方式。通过定义协议文件relation.proto，实现了ReqUserInfo和RespUserInfo等消息类型的构造，并展示了如何在C++中进行序列化和反序列化操作。

需要先定义协议文件 relation.proto,文件内容如下：

package mooon.rpc;

option cc_generic_services = true;

message ReqUserInfo

{

required uint32 userid = 1;

required string mask = 2;

}

message UserLanguage

{

required uint32 userid = 1;

optional string languageid = 2;

optional string createdate = 3;

optional string languagename = 4;

optional string languagefirstletter = 5;

optional string orderby = 6;

}

message UserLanguages

{

repeated UserLanguage userlanague = 1;

}

message RespUserInfo

{

required uint32 result = 1;

optional string msg = 2;

repeated UserLanguages userlanguage = 3;

}

service GetUserInfo

{

rpc userinfo (ReqUserInfo) returns (RespUserInfo);

}

使用 google protocol buffer 提供的工具

protoc relation.proto --cpp_out .

构造

relation.pb.h 和 relation.pb.cc

下面是pb_strem.cpp的主要实现,演示了序列化和反序列化的过程

#include <sstream>

#include <iostream>

#include <google/protobuf/io/coded_stream.h>

#include <google/protobuf/wire_format_lite_inl.h>

#include <google/protobuf/descriptor.h>

#include <google/protobuf/io/zero_copy_stream_impl.h>

#include <google/protobuf/io/zero_copy_stream.h>

#include <google/protobuf/io/coded_stream.h>

#include <google/protobuf/stubs/common.h>

#include <google/protobuf/message_lite.h>

#include <google/protobuf/message.h>

#include "relation.pb.h"

using namespace std;

using namespace example;

using namespace example::rpc;

using namespace::google::protobuf::io;

使用 google protocol buffer 提供的工具

protoc relation.proto --cpp_out .

构造

relation.pb.h 和 relation.pb.cc

const std::string decode()

{

::example::rpc::RespUserInfo* response = new ::example::rpc::RespUserInfo();

::example::rpc::UserLanguages *Languages = response->add_userlanguage();

const int count = 3;

//模拟构造多个对象

for(int i = 0;i < count;++i)

{

::example::rpc::UserLanguage *Language = Languages->add_userlanague();

Language->set_userid(i);

std::stringstream index;

index<<i;

Language->set_languageid("ID_" + index.str());

Language->set_createdate("date");

Language->set_languagename("name" + index.str());

Language->set_languagefirstletter("A");

Language->set_orderby(index.str());

std::stringstream s;

s<<"userid:"<<Language->userid()<<" name:"<<Language->languagename();

std::cout<<s.str()<<endl;

}

std::string serialize = "";

if(!Languages->SerializePartialToString(&serialize))

{

serialize = "";

std::cout<<"SerializePartialToString fail"<<endl;

}

delete response;

response = NULL;

return serialize;

}

void encode(const std::string &value)

{

::example::rpc::RespUserInfo* response = new ::example::rpc::RespUserInfo();

::example::rpc::UserLanguages *Languages = response->add_userlanguage();

::google::protobuf::io::CodedInputStream input((::google::protobuf::uint8*)value.c_str(),value.size());

if(Languages->MergePartialFromCodedStream(&input))

{

for(int i = 0;i < Languages->userlanague_size();++i)

{

const UserLanguage language = Languages->userlanague(i);

std::stringstream s;

s<<"userid:"<<language.userid()<<" name:"<<language.languagename();

std::cout<<s.str()<<endl;

}

else

{

std::cout<<"MergePartialFromCodedStream fail"<<endl;

}

std::cout<<"***************************"<<endl;

::example::rpc::UserLanguages languages = response->userlanguage(0);

for(int i = 0;i < languages.userlanague_size();++i)

{

const UserLanguage language = languages.userlanague(i);

std::stringstream s;

s<<"userid:"<<language.userid()<<" name:"<<language.languagename();

std::cout<<s.str()<<endl;

}

delete response;

response = NULL;

}

int _tmain(int argc, _TCHAR* argv[])

{

std::string s = decode();

std::cout<<"***************************"<<endl;

encode(s);

::system("pause");

return 0;

}