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Full Discussion: WRT counter show me that line from a txt file
Top Forums Programming WRT counter show me that line from a txt file Post 302164764 by user_prady on Tuesday 5th of February 2008 11:03:52 PM
Old 02-06-2008
Problem with feof function
Quote:
Originally Posted by shamrock
Code:
fh=fopen("abc1.txt","r");
if (fh ==NULL){
printf ("Error opening file: abc1.txt");
}

Is the code compiling alright? From the code you have posted it should dump because of how the input file is being specified specifically the code segment shown above. So how are you specifying the input filename to the compiled executable?

Here's the proper way...

Code:
fh = fopen(*++argv, "r");
if (!fh) {
   printf ("Error opening file: %s\n", *argv);
}

Thanks for the reply . I ve no problem with that .
I ve abc1.txt in the current directory , Iam not giving from command line argument..

Now I am doing like below for reading a file over and over upto the counter value.. But when I am using feof() func it gives me the following error.

read.c:13: warning: dereferencing `void *' pointer
read.c:13: request for member `_flag' in something not a structure or union

Please help me get my code correct..

Code:
#include <stdio.h>
 
void* fileopen();
void read_line(void*);
 
void read_line(void *fh){
              char s[50];
              int i,j;
              int counter = 3000;
                     for(i = 0; i< counter; i++){
                             fgets(s,49,fh);
                             printf("%s", s);
                             //if(feof(fh)){
                               //      rewind(fh);
                           // }
                     }
                     fclose(fh);
}
void* fileopen(){
          void *file = fopen("abc1.txt", "r");
            return file;
}
int main(void) {
 
           void *fh;
              fh = fileopen();
              read_line(fh);
              return 0;
}

 

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LEARN ABOUT OSF1

feof

feof(3) 						     Library Functions Manual							   feof(3)

NAME

       feof - Tests EOF on a stream

LIBRARY

       Standard C Library (libc)

SYNOPSIS

       #include <stdio.h>

       int feof(
	       FILE *stream);

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       feof(): XSH5.0

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Specifies the input stream.

DESCRIPTION

       The feof() function tests the EOF (end-of-file) condition on the specified stream.

NOTES

       [Tru64  UNIX]  The feof() function may be a macro (depending on the compile-time definitions used in the source).  Consequently, you cannot
       use this interface where a function is necessary; for example, a subroutine pointer cannot point to it.

RETURN VALUES

       If EOF has previously been detected reading the input stream specified by the stream parameter, a nonzero value is returned.  Otherwise,  a
       value of 0 (zero) is returned.

RELATED INFORMATION

       Functions: ferror(3), fileno(3), clearerr(3), fopen(3)

       Standards: standards(5) delim off

																	   feof(3)
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