dev-cpp-users

[Dev-C++] random access file updating

[Sam <sch...@ho...>]

hello all,

I have an assignment due for a class in C programming.  we are working =
on random access files.  I have been able to write the code to add =
records and search the file, but I'm having trouble with updating the =
file.  Any hits on how to write over a record in a random access file??  =

RE: [Dev-C++] random access file updating

[Marko <mj...@In...>]

open the file with "rw+", then, do fseek(...) & it should work ...
  -----Original Message-----
  From: dev...@li...
[mailto:dev...@li...]On Behalf Of Sam
  Sent: 12 March, 2001 2:23
  To: dev...@li...
  Subject: [Dev-C++] random access file updating


  hello all,

  I have an assignment due for a class in C programming.  we are working on
random access files.  I have been able to write the code to add records and
search the file, but I'm having trouble with updating the file.  Any hits on
how to write over a record in a random access file??

Re: [Dev-C++] random access file updating

[Vassili <v.v...@bt...>]

I usually make a copy of the file, some of the modes create a new file =
that overwrites the stored file, copy the contents to the new file.
Don't forget, once you've read a record from the file that the file =
pointer has moved to the end of the record, so move it back one record =
to overwrite it, something like:

fseek(stream, (-1 * SIZE_OF_RECORD), SEEK_CUR)

If the stream is not a pointer use the address of character '&'.
The -1 means "go backwards once".
SEEK_CUR means from current position.
  ----- Original Message -----=20
  From: Sam=20
  To: dev...@li...=20
  Sent: Monday, March 12, 2001 1:22 AM
  Subject: [Dev-C++] random access file updating


  hello all,

  I have an assignment due for a class in C programming.  we are working =
on random access files.  I have been able to write the code to add =
records and search the file, but I'm having trouble with updating the =
file.  Any hits on how to write over a record in a random access file??  =