google protobuf VC下的使用笔记

1

使用protobuf 2.x 下载地址（3.x 在c++11 vs2017下报错）

源码 https://github.com/google/protobuf

或者直接下载 二进制文件

2 如果下载的是代码 编译需要使用cmake 来生成VC的工程

cmake的使用从略

编译设置如图

3 如果下载的是代码  开启VC工程编译protobuf  由于以后自写代码需要使用protobuf的LIB 所以编译时请确认编译的版本

我使用的是VC2017编译的 x64 debug 版本

如图 

4 以protobuf中的例子 来进行实验

addressbook.proto

内容如下

 // See README.txt for information and build instructions.
 //
 // Note: START and END tags are used in comments to define sections used in
 // tutorials.  They are not part of the syntax for Protocol Buffers.
 //
 // To get an in-depth walkthrough of this file and the related examples, see:
 // https://developers.google.com/protocol-buffers/docs/tutorials

 // [START declaration]
 syntax = "proto3";
 package tutorial;
 // [END declaration]

 // [START java_declaration]
 option java_package = "com.example.tutorial";
 option java_outer_classname = "AddressBookProtos";
 // [END java_declaration]

 // [START csharp_declaration]
 option csharp_namespace = "Google.Protobuf.Examples.AddressBook";
 // [END csharp_declaration]

 // [START messages]
 message Person {
   string name = ;
   int32 id = ;  // Unique ID number for this person.
   string email = ;

   enum PhoneType {
     MOBILE = ;
     HOME = ;
     WORK = ;
   }

   message PhoneNumber {
     string number = ;
     PhoneType type = ;
   }

   repeated PhoneNumber phones = ;
 }

 // Our address book file is just one of these.
 message AddressBook {
   repeated Person people = ;
 }
 // [END messages]

addressbook.proto

使用编译好的protoc.exe 通过addressbook.proto 生成CPP文件

指令如下  protoc -I=proto文件所在路径 -I=protobuf下src所在目录 --cpp_out=指定生成文件的路径  addressbook.proto(完整路径)

5 VC创建一个命令行工程 根目录下创建lib文件夹

将步骤4生成的lib文件拷贝到该文件夹

根目录下创建include文件夹

将protobuf->src下的google文件夹拷贝到该文件夹下

6 VC配置工程的属性

添加文件夹和lib文件夹 以及lib的文件名

如图

工程需要加入生成的protobuf CC文件

关闭预编译头

关闭 sdl检测

7 编译代码 代码内容可参考

protobuf->examples->add_person.cc

 // See README.txt for information and build instructions.

 #include <iostream>
 #include <fstream>
 #include <string>
 #include "addressbook.pb.h"
 using namespace std;

 // This function fills in a Person message based on user input.
 void PromptForAddress(tutorial::Person* person) {
   cout << "Enter person ID number: ";
   int id;
   cin >> id;
   person->set_id(id);
   cin.ignore(, '\n');

   cout << "Enter name: ";
   getline(cin, *person->mutable_name());

   cout << "Enter email address (blank for none): ";
   string email;
   getline(cin, email);
   if (!email.empty()) {
     person->set_email(email);
   }

   while (true) {
     cout << "Enter a phone number (or leave blank to finish): ";
     string number;
     getline(cin, number);
     if (number.empty()) {
       break;
     }

     tutorial::Person::PhoneNumber* phone_number = person->add_phones();
     phone_number->set_number(number);

     cout << "Is this a mobile, home, or work phone? ";
     string type;
     getline(cin, type);
     if (type == "mobile") {
       phone_number->set_type(tutorial::Person::MOBILE);
     } else if (type == "home") {
       phone_number->set_type(tutorial::Person::HOME);
     } else if (type == "work") {
       phone_number->set_type(tutorial::Person::WORK);
     } else {
       cout << "Unknown phone type.  Using default." << endl;
     }
   }
 }

 // Main function:  Reads the entire address book from a file,
 //   adds one person based on user input, then writes it back out to the same
 //   file.
 int main(int argc, char* argv[]) {
   // Verify that the version of the library that we linked against is
   // compatible with the version of the headers we compiled against.
   GOOGLE_PROTOBUF_VERIFY_VERSION;

   if (argc != ) {
     cerr << "Usage:  " << argv[] << " ADDRESS_BOOK_FILE" << endl;
     return -;
   }

   tutorial::AddressBook address_book;

   {
     // Read the existing address book.
     fstream input(argv[], ios::in | ios::binary);
     if (!input) {
       cout << argv[] << ": File not found.  Creating a new file." << endl;
     } else if (!address_book.ParseFromIstream(&input)) {
       cerr << "Failed to parse address book." << endl;
       return -;
     }
   }

   // Add an address.
   PromptForAddress(address_book.add_people());

   {
     // Write the new address book back to disk.
     fstream output(argv[], ios::out | ios::trunc | ios::binary);
     if (!address_book.SerializeToOstream(&output)) {
       cerr << "Failed to write address book." << endl;
       return -;
     }
   }

   // Optional:  Delete all global objects allocated by libprotobuf.
   google::protobuf::ShutdownProtobufLibrary();

   return ;
 }

add_person.cc

运行结果如图