Question

我正在尝试从纯文本文件中读取行，但在句子中间有换行符，因此getline（）会读取直到换行符，直到句点为止。文本文件如下所示：

then he come tiptoeing down and stood right between us. we could
a touched him nearly. well likely it was minutes and minutes that
there warnt a sound and we all there so close together. there was a
place on my ankle that got to itching but i dasnt scratch it.

我的读入代码：

  // read in sentences
  while (file)
  {
    string s, record;
    if (!getline( file, s )) break;
    istringstream ss(s);

    while (ss)
    {
      string s;

      if (!getline(ss, s, '.')) break;
          record = s;
      if(record[0] == ' ')
          record.erase(record.begin());

      sentences.push_back(record);
    }
  }

  // output sentences
  for (vector<string>::size_type i = 0; i < sentences.size(); i++)
    cout << sentences[i] << "[][][][]" << endl;

[] [] [] []的目的是检查换行符是否用作分隔符，而不仅仅是读入字符串。输出看起来像：

then he come tiptoeing down and stood right between us.[][][][]
we could[][][][]
a touched him nearly.[][][][]
well likely it was minutes and minutes that[][][][]
there warnt a sound and we all there so close together.[][][][]
there was a[][][][]
place on my ankle that got to itching but i dasnt scratch it.[][][][]

Answer 1

你的问题究竟是什么？

您正在使用getline()使用换行符分隔符从file流中读取，然后使用getline()和分隔符{{istringstream is解析该行1}}。所以当然你在新行和'.'上都会破坏你的字符串。

Answer 2

getdelim（）的工作方式与getline（）类似，不同之处在于可以将除换行符之外的行分隔符指定为分隔符参数。与getline（）一样，如果在到达文件结尾之前输入中没有分隔符，则不会添加分隔符。

ssize_t getdelim(char **restrict lineptr, size_t *restrict n, int delimiter, FILE *restrict stream);

如何在getline（）中不使用\ n作为分隔符

2 个答案: