How can you get the conten of a folder with C++

TruongAn · 08-11-2005, 06:03 PM

Hello everyone.

My question is simple.
If your program is passed a directoy address, how can you make sure it is not invalid.
If it is valid, how can you get the name of all file and subdirectory in this folder.

Thanks for your attention

Matir · 08-11-2005, 06:56 PM

Look into opendir(), closedir(), readdir(), etc.

TruongAn · 08-13-2005, 02:58 AM

Quote:

Originally posted by Matir
Look into opendir(), closedir(), readdir(), etc.

What file do I need inculde in order to use these function.
Please note that I am new to Linux programing, I have no document
about how to use these function.

Matir · 08-13-2005, 09:32 AM

http://www.die.net/doc/linux/man/man3/opendir.3.html
http://www.die.net/doc/linux/man/man3/closedir.3.html
http://www.die.net/doc/linux/man/man3/readdir.3.html

lowpro2k3 · 08-13-2005, 09:47 AM

This should get you started...

Code:

#include <stdio.h>
#include <dirent.h>

main()
{
	DIR* d_str;
	struct dirent* dir;
	
	if((d_str = opendir("/etc")) == NULL)
	{
		printf("Could not open directory");
		exit(1);
	}

	while((dir = readdir(d_str)) != NULL)
	{
		printf("%-32s %d\n", dir->d_name, dir->d_ino);
	}
}

Basically you #include <dirent.h> (look for it on your system... slocate dirent.h). Calling opendir() returns a pointer to a DIR stream, and readdir() returns a pointer to a struct dirent. You call opendir once, and it returns NULL if it can't satisfy your request. You can call readdir repeatedly in a loop to get the entire contents of a directory. The first two entries will be "." and ".." respectively. I just googled for <dirent.h> and found a page by the Open Group with info on the header.

edit: As Matir showed, you have your man pages available which I always forget about too

Code:

man opendir
man closedir
man readdir
man rewinddir
man scandir

etc... As you need to know more you can just follow the trail of man pages.