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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
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<title>read</title>
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<div class="body-content">
<div class="header-box">
<a href="../index-2.html">cppreference.com</a> > <a href=
"index.html">C++ I/O</a> > <a href="read.html">read</a>
</div>
<div class="name-format">
read
</div>
<div class="syntax-name-format">
Syntax:
</div>
<pre class="syntax-box">
#include <fstream>
istream& read( char* buffer, streamsize num );
</pre>
<p>The function read() is used with input streams, and reads
<em>num</em> bytes from the stream before placing them in
<em>buffer</em>. If <strong>EOF</strong> is encountered, read()
stops, leaving however many bytes it put into <em>buffer</em> as they
are.</p>
<p>For example:</p>
<pre class="prettyprint">
struct {
int height;
int width;
} rectangle;
input_file.read( (char *)(&rectangle), sizeof(rectangle) );
if( input_file.bad() ) {
cerr << "Error reading data" << endl;
exit( 0 );
}
</pre>
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Related topics:
</div>
<div class="related-content">
<a href="gcount.html">gcount</a><br>
<a href="get.html">get</a><br>
<a href="getline.html">getline</a><br>
<a href="write.html">write</a>
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