Re: open for access file
Re: open for access file
- Subject: Re: open for access file
- From: Deivy Petrescu <email@hidden>
- Date: Fri, 17 Jul 2009 22:27:17 -0400
On Jul 17, 2009, at 7:55 PM, Mark J. Reed wrote:
That applies to reading, too. After running your script:
<snip>
Basically, without open, you get the whole file in one go. Writing
will create it or replace its entire contents, while reading will
return the whole file. Either action is idempotent: you can do it as
many times as you like with no change in the result.
Open for access introduces state. After you read or write, the file
is still open, but at the end. So another write will append, while
another read will signal end-of-file.
On Fri, Jul 17, 2009 at 7:15 PM, Stockly, Ed<email@hidden>
wrote:
You must open for access to write to a file however.
Not really:
Cool.
This illustrates the difference.
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Mark J. Reed <email@hidden>
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There are some advantages to opening for access, but with a bit of
effort this can be overcome.
So you get the same effect reading and writing without opening for
access.
As for reading you can read the whole file or bits of the file at a
time if this is what you want.
Thus;
read file f from 1 to 100 using delimiters "thisword"
works fine both using open for access or not.
Deivy Petrescu
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