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I am using the Boost::FileSystem library with C++ running under Linux platform and I have a question following:

I would like to have a list of files which are modified older than a given date time. I don't know whether the boost::FileSystem offer such a method as:

vector<string> listFiles = boost::FileSystem::getFiles("\directory", "01/01/2010 12:00:00");

If yes, could you please provide sample code?

halfer
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olidev
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  • possible duplicate of [how can I get a list of files in a folder in which the files are sorted with modified date time](http://stackoverflow.com/questions/4283546/how-can-i-get-a-list-of-files-in-a-folder-in-which-the-files-are-sorted-with-mod) – dandan78 Mar 18 '15 at 14:36

2 Answers2

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Boost::filesystem doesn't offer a function exactly like that. But you can use this:

http://www.boost.org/doc/libs/1_45_0/libs/filesystem/v3/doc/reference.html#last_write_time

as a basis to write your own. Here is some sample code using last_write_time:

#include <boost/filesystem/operations.hpp>
#include <ctime>
#include <iostream>

int main( int argc , char *argv[ ] ) {
   if ( argc != 2 ) {
      std::cerr << "Error! Syntax: moditime <filename>!\n" ;
      return 1 ;
   }
   boost::filesystem::path p( argv[ 1 ] ) ;
   if ( boost::filesystem::exists( p ) ) {
      std::time_t t = boost::filesystem::last_write_time( p ) ;
      std::cout << "On " << std::ctime( &t ) << " the file " << argv[ 1 ] 
     << " was modified the last time!\n" ;
      std::cout << "Setting the modification time to now:\n" ;
      std::time_t n = std::time( 0 ) ;
      boost::filesystem::last_write_time( p , n ) ; 
      t = boost::filesystem::last_write_time( p ) ;
      std::cout << "Now the modification time is " << std::ctime( &t ) << std::endl ;
      return 0 ;
   } else {
      std::cout << "Could not find file " << argv[ 1 ] << '\n' ;
      return 2 ;
   }
}
nabulke
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  • thanks. I saw this sample code from Boost:fileSystem, but how can I sort the files? – olidev Nov 26 '10 at 08:12
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    @JoesyXHN: Please show me the code you got so far, and I'm happy to help you further. But there's some effort required on your side. – nabulke Nov 26 '10 at 09:54
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    Hello nabulke. I try to do something similar http://stackoverflow.com/q/7056882/434051 , I provided code demo, And I do not get what is wrong (while it looks quite alike yours)=( – Rella Aug 24 '11 at 04:22
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You can use a std::map(last_write_time, fileName) to store the file last modified time and the absolute file path and the do an in-order traversal to sort the data.

Neeraj
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