📄 binaryio.html
字号:
<!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!-- but may not be published or retransmitted without explicit permission.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 21:47:46 2005 by faqproc version 2.7 --><!-- from source file stdio.sgml dated Wed Dec 21 13:07:57 2005 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/stdio/binaryio.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:58 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 12.37</title><link href="multiway.html" rev=precedes><link href="fopenbinary.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="multiway.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="fopenbinary.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 12.37</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>I want toread and write numbersbetween files and memoryin a byte-at-a-time way,not as formatted charactersthe way <TT>fprintf</TT> and <TT>fscanf</TT> do.Howcan I do this?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>What you're trying to do is usually called ``binary'' I/O.First,make sure that you are calling <TT>fopen</TT> with the <TT>"b"</TT> modifier(<TT>"rb"</TT>, <TT>"wb"</TT>, etc.;see question <a href="fopenbinary.html">12.38</a>).Then,use the <TT>&</TT> and <TT>sizeof</TT> operatorstoget a handle onthe sequences of bytesyou are trying to transfer.Usually,the <TT>fread</TT>and <TT>fwrite</TT> functionsare what you want to use;see question <a href="../struct/io.html">2.11</a>for an example.</p><p>Note, though,that <TT>fread</TT> and <TT>fwrite</TT> do not necessarily implybinary I/O.If you've opened a file in binary mode,you can use any I/O calls on it(seefor exampletheexamples inquestion <a href="extconform.html">12.42</a>);if you've opened it in text mode,you canuse <TT>fread</TT> or <TT>fwrite</TT> if they're convenient.</p><p>Finally,note that binary data files are not very portable;see question<a href="../misc/binaryfiles.html">20.5</a>.</p><p>See also question <a href="textvsbinary.html">12.40</a>.</p><!-- aend --><p><hr><a href="multiway.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="fopenbinary.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/stdio/binaryio.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:58 GMT --></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -