how can I read all file names in a directory that start with a specific word using c++?

Question

for instance I want to read all the text file names in a directory that start with 'word' like 'word1.txt'....'word200.txt', and there might be all these other files there which I don't want to see their names.
what would the C++ code for that be?

Answer 1

That's not in the C++ norm, it depends on system calls. On POSIX-compatible systems you should use readdir (and then strncmp or whatever). On Windows I have no idea.

Here is a copy of the man page: http://pubs.opengroup.org/onlinepubs/009695399/functions/readdir_r.html

Answer 2

The filesystem library is now the C++ norm (official release C++17). You will have to get a latest compiler and turn on C++17 options (eg gcc).

#include

http://en.cppreference.com/w/cpp/filesystem



Then use regex

#include

http://en.cppreference.com/w/cpp/regex/basic_regex

Answer 3

If only there were functions in C++ which compared strings.