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c file to extract real value from a txt file

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# 8  
Old 02-04-2008
Quote:
Originally Posted by user_prady
Dear Friends,

I am really in a great problem.
My problem is as follows

If I will send a counter to a function in c like read_line(counter);

Then it will read that line only which counter is pointing ,
Suppose I ve txt file like below

abc.txt
12.1
13.2
14.4

Then If I'll call the function as read_line(2);

It should read the 2nd line only and then put that value to a double pointer..

I mean one function call should read only the specified row,, and store it to a double pointer..

I need help badly..
One way you could do this is by moving the sscanf part of the code into the read_line() function. This way you just need to increment the variable by 1 after every call to fgets. After calling fgets you can invoke read_line() and pass the counter as an argument to it and inside read_line() the double floating number will be stored at the address specified by the double pointer using sscanf.
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LEARN ABOUT DEBIAN

io::bufferedselect

IO::BufferedSelect(3pm) 				User Contributed Perl Documentation				   IO::BufferedSelect(3pm)

NAME

       IO::BufferedSelect - Line-buffered select interface

SYNOPSIS

	   use IO::BufferedSelect;
	   my $bs = new BufferedSelect($fh1, $fh2);
	   while(1)
	   {
	       my @ready = $bs->read_line();
	       foreach(@ready)
	       {
		   my ($fh, $line) = @$_;
		   my $fh_name = ($fh == $fh1 ? "fh1" : "fh2");
		   print "$fh_name: $line";
	       }
	   }

DESCRIPTION

       The "select" system call (and the "IO::Select" interface) allows us to process multiple streams simultaneously, blocking until one or more
       of them is ready for reading or writing.  Unfortunately, this requires us to use "sysread" and "syswrite" rather than Perl's buffered I/O
       functions.  In the case of reading, there are two issues with combining "select" with "readline": (1) "select" might block but the data we
       want is already in Perl's input buffer, ready to be slurped in by "readline"; and(2) "select" might indicate that data is available, but
       "readline" will block because there isn't a full $/-terminated line available.

       The purpose of this module is to implement a buffered version of the "select" interface that operates on lines, rather than characters.
       Given a set of filehandles, it will block until a full line is available on one or more of them.

       Note that this module is currently limited, in that(1) it only does "select" for readability, not writability or exceptions; and(2) it
       does not support arbitrary line separators ($/): lines must be delimited by newlines.

CONSTRUCTOR

       new ( HANDLES )
	   Create a "BufferedSelect" object for a set of filehandles.  Note that because this class buffers input from these filehandles
	   internally, you should only use the "BufferedSelect" object for reading from them (you shouldn't read from them directly or pass them
	   to other BufferedSelect instances).

METHODS

       read_line
       read_line ($timeout)
       read_line ($timeout, @handles)
	   Block until a line is available on one of the filehandles.  If $timeout is "undef", it blocks indefinitely; otherwise, it returns after
	   at most $timeout seconds.

	   If @handles is specified, then only these filehandles will be considered; otherwise, it will use all filehandles passed to the
	   constructor.

	   Returns a list of pairs "[$fh, $line]", where $fh is a filehandle and $line is the line that was read (including the newline, ala
	   "readline").  If the filehandle reached EOF, then $line will be undef.  Note that "reached EOF" is to be interpreted in the buffered
	   sense: if a filehandle is at EOF but there are newline-terminated lines in "BufferedSelect"'s buffer, "read_line" will continue to
	   return lines until the buffer is empty.

SEE ALSO

       IO::Select

AUTHOR

       Antal Novak, <afn@cpan.org>

COPYRIGHT AND LICENSE

       Copyright (C) 2007 by Antal Novak

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.8 or,
       at your option, any later version of Perl 5 you may have available.

perl v5.10.1							    2007-03-13						   IO::BufferedSelect(3pm)