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+<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Binary Input and Output</title><meta name="generator" content="DocBook XSL Stylesheets V1.74.3" /><meta name="keywords" content=" ISO C++ , library " /><link rel="home" href="../spine.html" title="The GNU C++ Library Documentation" /><link rel="up" href="fstreams.html" title="Chapter 27. File Based Streams" /><link rel="prev" href="fstreams.html" title="Chapter 27. File Based Streams" /><link rel="next" href="
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</p><p>The first and most important thing to remember about binary I/O is
that opening a file with <code class="code">ios::binary</code> is not, repeat
<span class="emphasis"><em>not</em></span>, the only thing you have to do. It is not a silver
</p><p>Sorry. Them's the breaks.
</p><p>This isn't going to try and be a complete tutorial on reading and
writing binary files (because "binary"
- <a class="ulink" href="#7" target="_top">covers a lot of ground)</a>, but we will try and clear
+ covers a lot of ground), but we will try and clear
up a couple of misconceptions and common errors.
</p><p>First, <code class="code">ios::binary</code> has exactly one defined effect, no more
and no less. Normal text mode has to be concerned with the newline
Generally, binary mode is intended for binary files, and opening
text files in binary mode means that you now have to deal with all of
those end-of-line and end-of-file problems that we mentioned before.
+ </p><p>
An instructive thread from comp.lang.c++.moderated delved off into
this topic starting more or less at
- <a class="ulink" href="http://groups.google.com/groups?oi=djq&selm=an_436187505" target="_top">this</a>
- article and continuing to the end of the thread. (You'll have to
- sort through some flames every couple of paragraphs, but the points
- made are good ones.)
- </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="fstreams.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="fstreams.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="bk01pt11ch27s03.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 27. File Based Streams </td><td width="20%" align="center"><a accesskey="h" href="../spine.html">Home</a></td><td width="40%" align="right" valign="top"> More Binary Input and Output</td></tr></table></div></body></html>
+ <a class="ulink" href="http://groups.google.com/group/comp.std.c++/browse_thread/thread/f87b4abd7954a87/946a3eb9921e382d?q=comp.std.c%2B%2B+binary+iostream#946a3eb9921e382d" target="_top">this</a>
+ post and continuing to the end of the thread. (The subject heading is "binary iostreams" on both comp.std.c++
+ and comp.lang.c++.moderated.) Take special note of the replies by James Kanze and Dietmar Kühl.
+ </p><p>Briefly, the problems of byte ordering and type sizes mean that
+ the unformatted functions like <code class="code">ostream::put()</code> and
+ <code class="code">istream::get()</code> cannot safely be used to communicate
+ between arbitrary programs, or across a network, or from one
+ invocation of a program to another invocation of the same program
+ on a different platform, etc.
+ </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="fstreams.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="fstreams.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="io_and_c.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 27. File Based Streams </td><td width="20%" align="center"><a accesskey="h" href="../spine.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 28. Interacting with C</td></tr></table></div></body></html>
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