iconv_open.html
来自「unix 下的C开发手册,还用详细的例程。」· HTML 代码 · 共 118 行
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>iconv_open</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_005_941"> </a>NAME</h4><blockquote>iconv_open - codeset conversion allocation function</blockquote><h4><a name = "tag_000_005_942"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="iconv.h.html">iconv.h</a>>iconv_t iconv_open(const char *<i>tocode</i>, const char *<i>fromcode</i>);</code></pre></blockquote><h4><a name = "tag_000_005_943"> </a>DESCRIPTION</h4><blockquote>The<i>iconv_open()</i>function returns a conversion descriptorthat describes a conversionfrom thecodeset specified by the string pointed to by the<i>fromcode</i>argument to the codeset specified by the string pointed to by the<i>tocode</i>argument.For state-dependent encodings, the conversion descriptor will be ina codeset-dependent initial shift state, readyfor immediate use with<i><a href="iconv.html">iconv()</a></i>.<p>Settings of<i>fromcode</i>and<i>tocode</i>and their permitted combinations are implementation-dependent.<p>A conversion descriptor remains valid in a process until that process closesit.<p>If a file descriptor is used to implement conversion descriptors, theFD_CLOEXEC flag will be set; see<i><a href="fcntl.h.html"><fcntl.h></a></i>.</blockquote><h4><a name = "tag_000_005_944"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>iconv_open()</i>returns a conversion descriptor for use on subsequent calls to<i><a href="iconv.html">iconv()</a></i>.Otherwise<i>iconv_open()</i>returns (<b>iconv_t</b>)-1 and sets<i>errno</i>to indicate the error.</blockquote><h4><a name = "tag_000_005_945"> </a>ERRORS</h4><blockquote>The<i>iconv_open()</i>function may fail if:<dl compact><dt>[EMFILE]<dd>{OPEN_MAX} files descriptors are currently open in the calling process.<dt>[ENFILE]<dd>Too many files are currently open in the system.<dt>[ENOMEM]<dd>Insufficient storage space is available.<dt>[EINVAL]<dd>The conversion specified by<i>fromcode</i>and<i>tocode</i>is not supported by the implementation.</dl></blockquote><h4><a name = "tag_000_005_946"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_947"> </a>APPLICATION USAGE</h4><blockquote>Some implementations of<i>iconv_open()</i>use<i><a href="malloc.html">malloc()</a></i>to allocate space for internal buffer areas.The<i>iconv_open()</i>function may fail if there is insufficient storage spaceto accommodate these buffers.<p>Portable applications must assume that conversion descriptors are notvalid after a call to one of the<i>exec</i>functions.</blockquote><h4><a name = "tag_000_005_948"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_949"> </a>SEE ALSO</h4><blockquote><i><a href="iconv.html">iconv()</a></i>,<i><a href="iconv_close.html">iconv_close()</a></i>,<i><a href="iconv.h.html"><iconv.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the HP-UX manual.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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