解析Google协议缓冲区的文本文件 [英] Parse in text file for Google Protocol Buffer

问题描述

根据示例代码 https://developers.google.com/protocol-buffers/docs/cpptutorial ，它们展示了如何解析二进制格式的proto文件。使用

According to the example code https://developers.google.com/protocol-buffers/docs/cpptutorial, they show how to parse in a proto file that is in binary format. using

tutorial::AddressBook address_book;

{
  // Read the existing address book.
  fstream input(argv[1], ios::in | ios::binary);
  if (!address_book.ParseFromIstream(&input)) {
    cerr << "Failed to parse address book." << endl;
    return -1;
  }
}

我尝试删除 ios :: binary 用于我的文本格式的输入文件，但在读取文件时仍然失败。我需要做什么来读取文本格式的原型文件？

I tried removing the ios::binary for my input file that is in text format, but that still fails at reading in the file. What do I need to do to read in a proto file in text format?

推荐答案

好吧，我弄明白了。将文本原型文件读入对象....

Alright, I got this figured out. To read in a text proto file into an object....

#include <iostream>
#include <fcntl.h>
#include <fstream>
#include <google/protobuf/text_format.h>
#include <google/protobuf/io/zero_copy_stream_impl.h>

#include "YourProtoFile.pb.h"

using namespace std;

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;

  Tasking *tasking = new Tasking(); //My protobuf object

  bool retValue = false;

  int fileDescriptor = open(argv[1], O_RDONLY);

  if( fileDescriptor < 0 )
  {
    std::cerr << " Error opening the file " << std::endl;
    return false;
  }

  google::protobuf::io::FileInputStream fileInput(fileDescriptor);
  fileInput.SetCloseOnDelete( true );

  if (!google::protobuf::TextFormat::Parse(&fileInput, tasking))
  {
    cerr << std::endl << "Failed to parse file!" << endl;
    return -1;
  }
  else
  {
    retValue = true;
    cerr << "Read Input File - " << argv[1] << endl;
  }

  cerr << "Id -" << tasking->taskid() << endl;
}

我的程序将proto buff的输入文件作为第一个参数我在终端执行它。例如 ./ myProg inputFile.txt

My program takes in the input file for the proto buff as the first parameter when i execute it at the terminal. For example ./myProg inputFile.txt

希望这可以帮助任何有相同问题的人

Hope this helps anyone with the same question

这篇关于解析Google协议缓冲区的文本文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！