Use C ftell function to get the file pointer position

Syntax

C ftell function has the following syntax.

Header

C ftell function is from header file stdio.h.

Description

C ftell function returns the value for the file position pointer. Valid for binary file and invalid for text file. C ftell function returns -1 on failure.

Example

Get file pointer position using C ftell function.

#include <stdio.h>
#include <stdlib.h>
//from   ww w  . ja va  2s.  c o  m
int main(void){
   FILE *fp;

   if((fp=fopen("test", "rb")) == NULL) {
     printf("Cannot open file.\n");
     exit(1);
   }


   int i;
   if((i=ftell(fp)) == -1L)
      printf("A file error has occurred.\n");
   fclose(fp);
}