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<html><!-- #BeginTemplate "/Templates/tmpl.dwt" --><head><!-- #BeginEditable "doctitle" --> <title>PTypes: networking: utilities</title><!-- #EndEditable --> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link rel="stylesheet" href="styles.css"></head><body bgcolor="#FFFFFF" leftmargin="40" marginwidth="40"><p><a href="../index.html"><img src="title-1.7.gif" width="213" height="34" alt="C++ Portable Types Library (PTypes) Version 1.7" border="0"></a> <hr noshade><!-- #BeginEditable "body" --> <p class="hpath"><a href="index.html">Top</a>: <a href="inet.html">Networking</a>: Utilities</p><blockquote> <pre class="lang">#include <pinet.h>string iptostring(ipaddress ip);ipaddress phostbyname(const string& name);string phostbyaddr(ipaddress ip);string phostcname(const string& name);</pre></blockquote><p>Many PTypes networking utility functions and class methods manipulate a new data type <span class="lang">ipaddress</span> - IPv4 (4-byte) internetwork address type. The objects of this type can be constructed either by explicitly specifying the 4 bytes separately (e.g. <span class="lang">ipaddress(192, 168, 1, 1)</span>) or by assigning another <span class="lang">ipaddress</span>. The objects of this type are mutually compatible with <span class="lang">unsigned long</span> type, however, you can not rely on the order of bytes if an <span class="lang">ipaddress</span> is converted to a <span class="lang">unsigned long</span> and vice versa. This implicit typecast is provided only for comparing an <span class="lang">ipaddress</span> value with 0 or <span class="lang">ipnone</span> (see <a href="inet.examples.html">Examples</a>).</p><p><span class="def">string iptostring(ipaddress ip)</span> converts an IP address to a string, e.g. <span class="lang">ipaddress(127.0.0.1)</span> would be "127.0.0.1".</p><p><span class="def">ipaddress phostbyname(const string& name)</span> resolves a symbolic DNS name or a numeric IP addresses to <span class="lang">ipaddress</span>. On error this function returns <span class="lang">ipnone</span>.</p><p><span class="def">string phostbyaddr(ipaddress ip)</span> performs reverse DNS lookup for the given IP address. On error this function returns an empty string.</p><p><span class="def">string phostcname(const string& name)</span> returns the canonical name of the host. On error this function returns an empty string.</p><p class="seealso">See also: <a href="inet.ipstream.html">ipstream</a>, <a href="inet.ipstmserver.html">ipstmserver</a>, <a href="inet.examples.html">Examples</a></p><!-- #EndEditable --><hr size="1"><a href="../index.html" class="ns">PTypes home</a></body><!-- #EndTemplate --></html>?? 快捷鍵說明
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