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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN"><!-- This collection of hypertext pages is Copyright 1995-2005 by Steve Summit. --><!-- Content from the book "C Programming FAQs: Frequently Asked Questions" --><!-- (Addison-Wesley, 1995, ISBN 0-201-84519-9) is made available here by --><!-- permission of the author and the publisher as a service to the community. --><!-- It is intended to complement the use of the published text --><!-- and is protected by international copyright laws. --><!-- The on-line content may be accessed freely for personal use --><!-- but may not be published or retransmitted without explicit permission. --><!-- --><!-- this page built Sat Dec 24 21:47:47 2005 by faqproc version 2.7 --><!-- from source file osdepfile.sgml dated Sat Jun 26 20:52:13 2004 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/osdep/dospath.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:59:02 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 19.17</title><link href="copy.html" rev=precedes><link href="fopenenv.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="copy.html" rev=precedes><img src="../images/buttonleft.gif" alt="prev"></a><a href="index.html" rev=subdocument><img src="../images/buttonup.gif" alt="up"></a><a href="fopenenv.html" rel=precedes><img src="../images/buttonright.gif" alt="next"></a> <a href="../index-2.html"><img src="../images/buttontop.gif" alt="top/contents"></a><a href="../search.html"><img src="../images/buttonsrch.gif" alt="search"></a><hr><p><!-- qbegin --><h1>comp.lang.c FAQ list<font color=blue>·</font><!-- qtag -->Question 19.17</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>Why can't I open a file by its explicit path?Thecall<pre>fopen("c:\newdir\file.dat", "r")</pre>is failing.</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>The file you actually requested--withthe characters <TT>\n</TT> and <TT>\f</TT> in itsname--probablydoesn't exist,and isn't what you thought you were trying to open.</p><p>In character constants and string literals,the backslash <TT>\</TT> is an escape character,giving special meaning to the character following it.In orderforliteral backslashes ina pathname tobepassed through to <TT>fopen</TT>(or any other function)correctly,they have to be doubled,so that the firstbackslash in each pairquotes the second one:<pre> fopen("c:\\newdir\\file.dat", "r")</pre>Alternatively,under MS-DOS,it turns out thatforward slashes are also accepted as directory separators,so you could use<pre> fopen("c:/newdir/file.dat", "r")</pre>(Note, by the way, thatheader file namesmentioned inpreprocessor <TT>#include</TT> directivesare <em>not</em> string literals,so you may not have to worry about backslashes there.)</p><!-- aend --><p><hr><a href="copy.html" rev=precedes><img src="../images/buttonleft.gif" alt="prev"></a><a href="index.html" rev=subdocument><img src="../images/buttonup.gif" alt="up"></a><a href="fopenenv.html" rel=precedes><img src="../images/buttonright.gif" alt="next"></a> <a href="../questions.html"><img src="../images/buttontop.gif" alt="contents"></a><a href="../search.html"><img src="../images/buttonsrch.gif" alt="search"></a><br><!-- lastfooter --><a href="../about.html">about this FAQ list</a> <a href="../eskimo.html">about eskimo</a> <a href="../search.html">search</a> <a href="../feedback.html">feedback</a> <a href="copyright.html">copyright</a><p>Hosted by<a href="http://www.eskimo.com/"><img src="../../www.eskimo.com/img/link/eskitiny.gif" alt="Eskimo North"></a></body><!-- Mirrored from c-faq.com/osdep/dospath.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:59:02 GMT --></html>⌨️ 快捷键说明
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