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Rapier

Directory listings

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Hi guys and gals, Ok, here is a little teaser. How does one find the contents of a directory in C/C++ without using any windows specific functions? Ie: If I now the directory that I want to search, I want to get the first file in it and then step through each file getting each filename. --== Rapier ==-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Save the whales, feed the hungry, free the mallocs!

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You can use findfirst, findnext and findclose to get the files in a directory.

Problem is, though, that not all compilers use the same names and/or same include files for those functions. VC++ 6, for example, puts these functions in io.h and prepends an underscore. BCC 5.5 places them in dir.h and doesn''t use an underscore. On other platforms, it''s still different...

Erik

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Er, it says in the Visual C++ docs that _findfirst, _findlast, etc etc are Windows specific functions. Which was not what was asked for Now, I''m no C++ standard expert, but it''s possible there are no standardised directory-level functions, since they would be platform-dependent. I get a feeling that the closest you will get is the POSIX stuff (opendir, readdir, closedir and rewinddir) except that MSVC doesn''t seem to support them...

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*Nods to Kylotan* Yeah, thats what I thought about findfirst etc.

The thing is, I need to write a this thing to run on what is -probably- going to be a unix server, and I need to parse a directory for n amount of files, the names of which I wont know.

Anybody got any ideas?

--== Rapier ==--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Save the whales, feed the hungry, free the mallocs!

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You may have to just do this:

FilenameList StoreDirectoryInList(String theDirectory)
{
FilenameList theList;
#ifdef WIN32
// Do it the Win32 way here
#else
// Do it the Unix way here
#endif // WIN32

return theList;
}

If you put it into a wrapper like this, the rest of your code never needs to care whether it is running on Unix or Win32.

Edited by - Kylotan on 5/5/00 2:59:07 PM

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I believe POSIX specifies opendir(), readdir(), closedir(), etc. for scanning directory entries in the file system.

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quote:
Original post by SiCrane

I believe POSIX specifies opendir(), readdir(), closedir(), etc. for scanning directory entries in the file system.


Yep. You''re right. Those functions are part of POSIX.1, XPG4, XPG4-UNIX standards. They are supported by BSD 4.3, too. Using those functions you''ll get quite portable program.

BTW, referring to the original posting, there''s a nice and useful function that you could use to fetch the content of a specific directory (eventually applying a filter to it): scandir(). In fact, it''s a "macro-function" that uses the primitives you mentioned. It''s prototype follows:

int scandir(const char *dir, struct dirent ***namelist, int (*select)(const struct dirent *), int (*compar)(const struct dirent **, const struct dirent **));

More details if needed...


Bye,

Karmalaa /

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Thats exactly what I am looking for. Thanks a lot. You have all been, as always, a great help.

Thanks.

--== Rapier ==--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Save the whales, feed the hungry, free the mallocs!

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