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Re: fopen

First of all, one of the main problems you have is that you aren't checking your errors. UNIX, unlike Mac OS, has had, for many many years, a simple way of printing out the actual error, in a way a human can easily understand. None of the "error -12345" business.

The correct way to check the return code from fopen (check the Return section of the manual-page to see how best to check for errors) is as follows.

FILE *fp;
char *filename = "xxxx";

if( (fp = fopen( filename, "w" )) == NULL ) {
    perror("Could not open filename");
    // either return with an error code, or exit(EXIT_FAILURE)
}

x-man-page://perror, which is part of the stdio library, will  output to stderr, the string given, followed by a colon and space, and the human-readable string that relates to errno, such as "No such file or directory" (which is what you would get if errno == ENOENT)

If you want more control, you can use x-man-page://strerror

You should always check your return codes.

One other problem you have is that you're assuming a folder will be created for you, which fopen will not do.

-- 

Cameron Kerr

Telecommunications Teaching Fellow & SysAdmin

email@hidden


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