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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <meta name="generator" content= "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org"> <title>read</title> <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table> <tr> <td> <div class="body-content"> <div class="header-box"> <a href="../index.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="example-code"> 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> <div class="related-name-format"> 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> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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