Re: help with fwrite()

From:
Pete Becker <pete@versatilecoding.com>
Newsgroups:
comp.lang.c++
Date:
Fri, 1 Feb 2008 18:33:04 -0500
Message-ID:
<2008020118330416807-pete@versatilecodingcom>
On 2008-02-01 18:19:18 -0500, "T. Crane" <trevis.crane@gmail.com> said:

I'm trying to use successive calls to fwrite() to write out to a file.
I don't have any trouble opening the file or getting everything I need
in there, but I do notice a peculiarity about it that I will describe.

I call it like so:

fwrite(&buffer, 14, 1, filestream)

I then call it may times in a loop where I've set my buffer pointer to
change with each iteration so that it writes the data I want it to
write. When I go into debug mode, I can then open up the file in a
reader and watch it grow, so to speak. The odd thing is that it
doesn't seem to grow with every call to fwrite(). It only seems to
grow in 4 kB jumps. Does anyone know why this would be?


Output streams are usually buffered by the runtime library, and 4k is
certainly a reasonable size for that buffer. The contents of the buffer
only get written to disk when the buffer gets full or you close the
file.

--
  Pete
Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The
Standard C++ Library Extensions: a Tutorial and Reference
(www.petebecker.com/tr1book)

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