Thread: Check if a file exists - C99 Standard

  1. #1
    Registered User
    Join Date
    May 2017

    Check if a file exists - C99 Standard

    What is the best way to see if a file exist ?

    I write this one but i canīt know if the file exist or if i canīt read it.

    I can only use C99 Standard

       pFile = fopen(nomeFich, "rb");
        // File Exist
        if (pFile != NULL) {
                     // Doing my stuff here, create a list...     
            return list;
        } else {
            puts("The file donīt exist or canīt be open);
            return NULL;

  2. #2
    C++ Witch laserlight's Avatar
    Join Date
    Oct 2003
    I think that's the best you can do given the standard I/O functions.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  3. #3
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    The errno variable (errno.h) and the strerror function (string.h) will tell you why the file could not be opened.
    if ( fp == NULL ) {
      // or use the perror() function
      printf("why? %d %s\n", errno, strerror(errno));
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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