如何获取文件夹中文件的列表，该文件中的文件按修改的日期时间排序? [英] How to get a list of files in a folder in which the files are sorted with modified date time?

问题描述

我需要一个文件夹中的文件列表，并且文件将按照其修改的日期时间进行排序.

I need to a list of files in a folder and the files are sorted with their modified date time.

我正在Linux下使用C ++，支持Boost库.

I am working with C++ under Linux, the Boost library is supported.

任何人都可以向我提供一些有关如何实现此功能的代码示例吗?

Could anyone please provide me some sample of code of how to implement this?

推荐答案

大多数操作系统都不以任何特定顺序返回目录条目.如果要对它们进行排序(如果要向人类用户显示结果，则可能应该这样做)，您需要单独进行一次.您可以执行的一种方法是将条目插入std::multimap，类似这样:

Most operating systems do not return directory entries in any particular order. If you want to sort them (you probably should if you are going to show the results to a human user), you need to do that in a separate pass. One way you could do that is to insert the entries into a std::multimap, something like so:

namespace fs = boost::filesystem;
fs::path someDir("/path/to/somewhere");
fs::directory_iterator end_iter;

typedef std::multimap<std::time_t, fs::path> result_set_t;
result_set_t result_set;

if ( fs::exists(someDir) && fs::is_directory(someDir))
{
  for( fs::directory_iterator dir_iter(someDir) ; dir_iter != end_iter ; ++dir_iter)
  {
    if (fs::is_regular_file(dir_iter->status()) )
    {
      result_set.insert(result_set_t::value_type(fs::last_write_time(dir_iter->path()), *dir_iter));
    }
  }
}

然后您可以遍历result_set，映射的boost::filesystem::path条目将以升序排列.

You can then iterate through result_set, and the mapped boost::filesystem::path entries will be in ascending order.

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