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+ ISO C++
+ ,
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+ "><meta name="keywords" content="
+ ISO C++
+ ,
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+ "><link rel="home" href="../index.html" title="The GNU C++ Library"><link rel="up" href="io.html" title="Chapter 13. Input and Output"><link rel="prev" href="stringstreams.html" title="Memory Based Streams"><link rel="next" href="io_and_c.html" title="Interacting with C"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">File Based Streams</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="stringstreams.html">Prev</a> </td><th width="60%" align="center">Chapter 13.
Input and Output
-</th><td
align="right"> <a accesskey="n" href="io_and_c.html">Next</a></td></tr></table><hr/></div><div class="section" title="File Based Streams"><div class="titlepage"><div><div><h2 class="title"><a id="std.io.filestreams"/>File Based Streams</h2></div></div></div><div class="section" title="Copying a File"><div class="titlepage"><div><div><h3 class="title"><a id="std.io.filestreams.copying_a_file"/>Copying a File</h3></div></div></div><p>
+</th><td
width="20%" align="right"> <a accesskey="n" href="io_and_c.html">Next</a></td></tr></table><hr></div><div class="section" title="File Based Streams"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="std.io.filestreams"></a>File Based Streams</h2></div></div></div><div class="section" title="Copying a File"><div class="titlepage"><div><div><h3 class="title"><a name="std.io.filestreams.copying_a_file"></a>Copying a File</h3></div></div></div><p>
</p><p>So you want to copy a file quickly and easily, and most important,
completely portably. And since this is C++, you have an open
ifstream (call it IN) and an open ofstream (call it OUT):
The operators shown above are all defined in the parent
basic_ostream class and are therefore available with all possible
descendants.
- </p></div><div class="section" title="Binary Input and Output"><div class="titlepage"><div><div><h3 class="title"><a
id="std.io.filestreams.binary"/>Binary Input and Output</h3></div></div></div><p>
+ </p></div><div class="section" title="Binary Input and Output"><div class="titlepage"><div><div><h3 class="title"><a
name="std.io.filestreams.binary"></a>Binary Input and Output</h3></div></div></div><p>
</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
of <span class="emphasis"><em>formatting</em></span> functions and classes to perform something
which <span class="emphasis"><em>requires</em></span> that formatting not be done? There are a
seemingly infinite number of solutions, and a few are listed here:
- </p><div class="itemizedlist"><ul class="itemizedlist"><li class="listitem"><p><span class="quote">“<span class="quote">Derive your own fstream-type classes and write your own
+ </p><div class="itemizedlist"><ul class="itemizedlist"
type="disc"><li class="listitem"><p><span class="quote">“<span class="quote">Derive your own fstream-type classes and write your own
<</>> operators to do binary I/O on whatever data
types you're using.</span>”</span>
</p><p>
</p><p>
An instructive thread from comp.lang.c++.moderated delved off into
this topic starting more or less at
- <a class="link" href="http://groups.google.com/group/comp.std.c++/browse_thread/thread/f87b4abd7954a87/946a3eb9921e382d?q=comp.std.c%2B%2B+binary+iostream#946a3eb9921e382d">this</a>
+ <a class="link" 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
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.
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+ </p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="stringstreams.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="io.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">Memory Based Streams </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Interacting with C</td></tr></table></div></body></html>
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