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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>getline</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="getline.html">getline</a> </div> <div class="name-format"> getline </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <fstream> istream& getline( char* buffer, streamsize num ); istream& getline( char* buffer, streamsize num, char delim );</pre> <p>The getline() function is used with input streams, and reads characters into <em>buffer</em> until either:</p> <ul> <li><em>num</em> - 1 characters have been read,</li> <li>a newline is encountered,</li> <li>an <strong>EOF</strong> is encountered,</li> <li>or, optionally, until the character <em>delim</em> is read. The <em>delim</em> character is not put into buffer.</li> </ul> <p>For example, the following code uses the getline function to display the first 100 characters from each line of a text file:</p> <pre class="example-code"> ifstream fin("tmp.dat"); int MAX_LENGTH = 100; char line[MAX_LENGTH]; while( fin.getline(line, MAX_LENGTH) ) { cout << "read line: " << line << endl; }</pre> <p>If you'd like to read lines from a file into <a href="../cppstring/index.html">strings</a> instead of character arrays, consider using the <a href="../cppstring/getline.html">string getline</a> function.</p> <p>Those using a Microsoft compiler may find that getline() reads an extra character, and should consult the documentation on the <a href= "http://support.microsoft.com/default.aspx?scid=kb;EN-US;q240015">Microsoft getline bug</a>.</p> <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> (C++ Strings) <a href="../cppstring/getline.html">getline</a><br> <a href="ignore.html">ignore</a><br> <a href="read.html">read</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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