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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 SUSE

tracker-extract

tracker-extract(1)						   User Commands						tracker-extract(1)

NAME

       tracker-extract - Extract metadata from a file.

SYNOPSYS

       tracker-extract [OPTION...] FILE...

DESCRIPTION

       tracker-extract reads the file and mimetype provided in stdin and extract the metadata from this file; then it displays the metadata on the
       standard output.

       NOTE: If a FILE is not provided then tracker-extract will run for 30 seconds waiting for DBus calls before quitting.

OPTIONS

       -?, --help
	      Show summary of options.

       -v, --verbosity=N
	      Set verbosity to N. This overrides the config value.  Values include 0=errors, 1=minimal, 2=detailed and 3=debug.

       -f, --file=FILE
	      The FILE to extract metadata from. The FILE argument can be either a local path or a URI. It also does not have to  be  an  absolute
	      path.

       -m, --mime=MIME
	      The MIME type to use for the file. If one is not provided, it will be guessed automatically.

       -d, --disable-shutdown
	      Disable shutting down after 30 seconds of inactivity.

       -i, --force-internal-extractors
	      Use this option to force internal extractors over 3rd parties like libstreamanalyzer.

       -m, --force-module=MODULE
	      Force  a particular module to be used. This is here as a convenience for developers wanting to test their MODULE file. Only the MOD-
	      ULE name has to be specified, not the full path. Typically, a MODULE is installed  to  /usr/lib/tracker-0.7/extract-modules/.   This
	      option can be used with or without the .so part of the name too, for example, you can use --force-module=foo

	      Modules are shared objects which are dynamically loaded at run time. These files must have the .so suffix to be loaded and must con-
	      tain the correct symbols to be authenticated by tracker-extract.	For more information see the libtracker-extract reference documen-
	      tation.

       -V, --version
	      Show binary version.

EXAMPLES

       Using command line to extract metadata from a file:

	       $ tracker-extract -v 3 -f /path/to/some/file.mp3

       Using a specific module to extract metadata from a file:

	       $ tracker-extract -v 3 -f /path/to/some/file.mp3 -m mymodule

ENVIRONMENT

       TRACKER_EXTRACTORS_DIR
	      This  is	the directory which tracker uses to load the shared libraries from (used for extracting metadata for specific file types).
	      These are needed on each invocation of tracker-store. If unset it will default to the correct place. This is used mainly for testing
	      purposes.

FILES

       $HOME/.config/tracker/tracker-extract.cfg

SEE ALSO

       tracker-store(1), tracker-sparql(1), tracker-stats(1), tracker-info(1).

       tracker-extract.cfg(5).

       /usr/lib/tracker-0.7/extract-modules/

GNU
								     July 2007							tracker-extract(1)