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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!-- but may not be published or retransmitted without explicit permission.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 osdepmem.sgml dated Sat Feb 14 21:25:34 2004 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/osdep/bigdatastr.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:59:03 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 19.23</title><link href="memavail.html" rev=precedes><link href="dgroup.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="memavail.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="dgroup.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 19.23</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>How can I allocate arrays or structures bigger than 64K?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>A reasonablecomputerought togive you transparent accessto all available memory.If you'renot so lucky,you'll either have to rethink your program's use of memory,or use various system-specific techniques.</p><p>64K is(still)a prettybig chunk of memory.No matter how much memory your computerhas available,it's asking a lot to be able to allocate huge amounts ofitcontiguously.(The C Standard does not guarantee thatsingle objects can be 32K or larger,or 64K for C99.)Often it's a good idea to use datastructures which don't require that all memory be contiguous.For dynamically-allocated multidimensional arrays,you canuse pointers to pointers,as illustrated inquestions <a href="../aryptr/dynmuldimary.html">6.16</a> and <a href="../misc/ragged.html">20.2</a>.Instead of a large array of structures,you can use a linked list,or an array of pointers to structures.</p><p>If you're using aPC-compatible(8086-based)system,and running up against a64K or640K limit,consider using``huge'' memory model,or expanded or extendedmemory,or malloc variants such as <TT>halloc</TT>or <TT>farmalloc</TT>,or a 32-bit``flat'' compiler(e.g. djgpp,see question <a href="../resources/compilers.html">18.3</a>),or some kind of a DOS extender,or another operating system.</p><p>References:ISO Sec. 5.2.4.1<br>C9X Sec. 5.2.4.1<br></p><!-- aend --><p><hr><a href="memavail.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="dgroup.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/bigdatastr.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:59:03 GMT --></html>⌨️ 快捷键说明
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