Can't open file

This is a discussion on Can't open file within the C Programming forums, part of the General Programming Boards category; Hi, I'm having a problem openning a file. My code seems to work fine on the files that I have ...

  1. #1
    Registered User
    Join Date
    May 2003
    Posts
    1

    Unhappy Can't open file

    Hi,
    I'm having a problem openning a file. My code seems to work fine on the files that I have created, but won't open a file that my
    instructor gave me. The file is a bunch of hex values(which really
    shouldn't matter) and has a .dat extention. I thought that
    possibly the extention was a problem, so I created a new .txt
    file, then copied and pasted the data. My code would not open the new file either . Here is my code:

    #include <stdlib.h>
    #include <stdio.h>
    void main(void)
    {
    FILE *fptr1;
    char fname[]="Virtual_Machine.txt",c='y',ch,dum,out[20];
    int i=0;
    if((fptr1 =fopen(fname, "r"))==NULL)
    {
    printf("Cannot open %s.\n",fname);
    exit(1);
    }
    while((c!='n')&&((ch=fgetc(fptr1))!=EOF))
    {
    printf("char is: %c \n",ch);
    out[i]= ch;
    printf("char is: %c \n",out[i]);
    printf("CONTINUE?:\n");
    c=getchar();
    dum=getchar(); //flushes newline
    }
    fclose(fptr1);
    }

    Any insight would be greatly appreciated.
    Thanks,
    Darren

  2. #2
    Code Goddess Prelude's Avatar
    Join Date
    Sep 2001
    Posts
    9,796
    Instead of the non-informative
    Code:
    printf("Cannot open %s.\n",fname);
    try using perror instead. It should tell you why the file can't be opened. Chances are that the program is looking in a different location that where the file is.

    >void main(void)
    void main is only valid if you're on a freestanding implementation. Since you're learning C, this is highly unlikely. Use one of these:
    Code:
    int main(void) /* No arguments */
    int main(int argc, char **argv) /* Command line arguments */
    And of course, return an integer value at the end.
    My best code is written with the delete key.

  3. #3
    Registered User
    Join Date
    Feb 2003
    Posts
    76
    Though the ANSI C standard no longer distinguishes text and binary files, for compatibility reasons change the fopen call to:

    Code:
       fopen(fname,"rb")

  4. #4
    Code Goddess Prelude's Avatar
    Join Date
    Sep 2001
    Posts
    9,796
    >Though the ANSI C standard no longer distinguishes text and binary files
    What section, paragraph, and line did you read this from?
    My best code is written with the delete key.

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