Help!How can I get the file name list in C program?

wuzhong · 09-21-2004, 08:42 PM

I mean if I use the function "scandir",how can I get the match file name and list in modified time order asc.

thank you very much!

irfanhab · 09-21-2004, 09:55 PM

you can use ls

system("ls>file")

and then read the file

wuzhong · 09-21-2004, 10:18 PM

Maybe this can not run very well when the file number is very large!!

CroMagnon · 09-21-2004, 10:52 PM

ls is doing the same work you'd have to do to get the information you want - you would have to write a comparison function for scandir that used stat() to get the modified time of each file, and I think this would turn out slower than just calling ls, due to the number of stat commands. If you're worried about the disk space used by the output, you could use popen instead to read the output directly.

cracauer · 09-21-2004, 11:14 PM

The official way in in C is readdir(3) and friends.

However, a

Code:

  popen("ls foo*.bar", "r");

will do anytime and supports the globbing you might want out of the box. You can also use `find` instead of `ls` for more options and/or recursion into the tree.

wuzhong · 09-22-2004, 09:36 AM

Yes,this is a very good way.

and this way is useful for many other resolvent.

thank you!!

jdruin · 09-22-2004, 11:56 AM

Maybe copying the basic code from ls.c would be helpful if you need the functionality but you also need to customize it some. Then you could change the code to work how you need inside your program.