File names...

This is a discussion on File names... within the C Programming forums, part of the General Programming Boards category; Hi, I was wondering if there's a way to list the names of some files in a folder. I was ...

  1. #1
    The superhaterodyne twomers's Avatar
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    File names...

    Hi, I was wondering if there's a way to list the names of some files in a folder. I was thinking about doing something like

    system ("cd fildfile");
    system ("dir");

    but all I want is the filenames, not the complete info of each file. The files will have a max of 10 letters.

    I'm using ms vc and windows xp

    thanks!!

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  3. #3
    and the hat of wrongness Salem's Avatar
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    Or even, novel concept this, the FAQ

  4. #4
    The superhaterodyne twomers's Avatar
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    That's fantastic, but there isn't any simple function that'll do it is there? I also got this message when I tried to run it:

    return.exe has encountered a problem and needs to close. We are sorry for the inconvenience.
    even though:

    --------------------Configuration: return - Win32 Debug--------------------
    Compiling...
    return.c
    Linking...

    return.exe - 0 error(s), 0 warning(s)

  5. #5
    The superhaterodyne twomers's Avatar
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    salem, why does it say "banned" under your name?

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    The superhaterodyne twomers's Avatar
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    Hmmm ... it doesn't seem to recognise dir.h ... any ideas???

    --------------------Configuration: file - Win32 Debug--------------------
    Compiling...
    file.c
    u:\file.c(2) : fatal error C1083: Cannot open include file: 'dir.h': No such file or directory
    Error executing cl.exe.

    file.obj - 1 error(s), 0 warning(s)

  7. #7
    Registered User TactX's Avatar
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    You've taken the first example because you use a Borland Compiler, right?

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    Quote Originally Posted by twomers
    Hmmm ... it doesn't seem to recognise dir.h ... any ideas???
    I wrote you a quick example, under windows you have to use FindFirstFile and FindNextFile, but like all windows API functions it is hardly intuitive also I don't see why they couldn't just make it one function.

    Code:
    #include <stdio.h>
    #include <windows.h>
    
    /* 
     * listfiles.c, an example of listing files
     * in a directory using Windows API.
     */
    
    int main(void)
    {
        WIN32_FIND_DATA ffd;
        char dir[] = "c:\\program files\\*"; /* '*' is a wildcard character
                                                it tells FindFirstFile to
                                                find any file in the directory */
        HANDLE h = FindFirstFile(dir, &ffd);
        if (h == INVALID_HANDLE_VALUE) {
            printf("Unable to list files.");
            return 0;
        }
        
        printf("Listing files in directory %s\n", dir);
        do {
            printf("%s\n", ffd.cFileName); /* ffd.cFileName is the name of the
                                              file found */
        } while (FindNextFile(h, &ffd) != 0);
        
        
        return 0;
    }

  9. #9
    The superhaterodyne twomers's Avatar
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    Quote Originally Posted by TactX
    You've taken the first example because you use a Borland Compiler, right?
    what's a borland compiler??

  10. #10
    The superhaterodyne twomers's Avatar
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    That's a fantastic piece of code!! and it works

  11. #11
    Registered User ssharish2005's Avatar
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    Quote Originally Posted by twomers
    what's a borland compiler??
    its a compiler which actually compiles C/C++ programs
    http://www.borland.com/us/products/index.html


    ssharish2005

  12. #12
    It's full of stars adrianxw's Avatar
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    >>> and it works

    It may work as a small isolated program, however, as production code or as part of a larger program that is doing this a lot, it will cause problems. It does not, for example, close the search handle which it should.

    My tutorial starting here addresses this and other issues.

    It is written in C++ but if you change the couts to printfs it will work, the API calls and returns will be the same.
    Wave upon wave of demented avengers march cheerfully out of obscurity unto the dream.

  13. #13
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    Quote Originally Posted by adrianxw
    >>> and it works

    It may work as a small isolated program, however, as production code or as part of a larger program that is doing this a lot, it will cause problems. It does not, for example, close the search handle which it should.

    Oops my bad, I only whipped it up in a couple of minutes. Just pop a FindClose(h); in there before return 0. Oh yeah and there's no need for my string to be a character array too I guess.
    Code:
    #include <stdio.h>
    #include <windows.h>
    
    /* 
     * listfiles.c, an example of listing files
     * in a directory using Windows API.
     */
    
    int main(void)
    {
        WIN32_FIND_DATA ffd;
        char *dir = "c:\\winnt\\*"; /* '*' is a wildcard character */
        HANDLE h = FindFirstFile(dir, &ffd);
    
        if (h == INVALID_HANDLE_VALUE) {
            printf("Unable to list files.");
            return 0;
        }
        
        printf("Listing files in directory %s\n", dir);
        do {
            printf("%s\n", ffd.cFileName);
        } while (FindNextFile(h, &ffd) != 0);
        
        FindClose(h);
        return 0;
    }
    Last edited by Brian; 01-03-2006 at 01:41 PM.

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