1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>ip::basic_resolver::resolve (9 of 12 overloads)</title> 5<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../../boost_asio.html" title="Boost.Asio"> 8<link rel="up" href="../resolve.html" title="ip::basic_resolver::resolve"> 9<link rel="prev" href="overload8.html" title="ip::basic_resolver::resolve (8 of 12 overloads)"> 10<link rel="next" href="overload10.html" title="ip::basic_resolver::resolve (10 of 12 overloads)"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="overload8.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../resolve.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../boost_asio.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="overload10.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h5 class="title"> 27<a name="boost_asio.reference.ip__basic_resolver.resolve.overload9"></a><a class="link" href="overload9.html" title="ip::basic_resolver::resolve (9 of 12 overloads)">ip::basic_resolver::resolve 28 (9 of 12 overloads)</a> 29</h5></div></div></div> 30<p> 31 Perform forward resolution of a query to a list of entries. 32 </p> 33<pre class="programlisting">results_type resolve( 34 const protocol_type & protocol, 35 string_view host, 36 string_view service, 37 resolver_base::flags resolve_flags); 38</pre> 39<p> 40 This function is used to resolve host and service names into a list of 41 endpoint entries. 42 </p> 43<h6> 44<a name="boost_asio.reference.ip__basic_resolver.resolve.overload9.h0"></a> 45 <span class="phrase"><a name="boost_asio.reference.ip__basic_resolver.resolve.overload9.parameters"></a></span><a class="link" href="overload9.html#boost_asio.reference.ip__basic_resolver.resolve.overload9.parameters">Parameters</a> 46 </h6> 47<div class="variablelist"> 48<p class="title"><b></b></p> 49<dl class="variablelist"> 50<dt><span class="term">protocol</span></dt> 51<dd><p> 52 A protocol object, normally representing either the IPv4 or IPv6 53 version of an internet protocol. 54 </p></dd> 55<dt><span class="term">host</span></dt> 56<dd><p> 57 A string identifying a location. May be a descriptive name or a 58 numeric address string. If an empty string and the passive flag 59 has been specified, the resolved endpoints are suitable for local 60 service binding. If an empty string and passive is not specified, 61 the resolved endpoints will use the loopback address. 62 </p></dd> 63<dt><span class="term">service</span></dt> 64<dd><p> 65 A string identifying the requested service. This may be a descriptive 66 name or a numeric string corresponding to a port number. May be 67 an empty string, in which case all resolved endpoints will have 68 a port number of 0. 69 </p></dd> 70<dt><span class="term">resolve_flags</span></dt> 71<dd><p> 72 A set of flags that determine how name resolution should be performed. 73 The default flags are suitable for communication with remote hosts. 74 See the <a class="link" href="../../ip__resolver_base.html" title="ip::resolver_base"><code class="computeroutput">ip::resolver_base</code></a> 75 documentation for the set of available flags. 76 </p></dd> 77</dl> 78</div> 79<h6> 80<a name="boost_asio.reference.ip__basic_resolver.resolve.overload9.h1"></a> 81 <span class="phrase"><a name="boost_asio.reference.ip__basic_resolver.resolve.overload9.return_value"></a></span><a class="link" href="overload9.html#boost_asio.reference.ip__basic_resolver.resolve.overload9.return_value">Return 82 Value</a> 83 </h6> 84<p> 85 A range object representing the list of endpoint entries. A successful 86 call to this function is guaranteed to return a non-empty range. 87 </p> 88<h6> 89<a name="boost_asio.reference.ip__basic_resolver.resolve.overload9.h2"></a> 90 <span class="phrase"><a name="boost_asio.reference.ip__basic_resolver.resolve.overload9.exceptions"></a></span><a class="link" href="overload9.html#boost_asio.reference.ip__basic_resolver.resolve.overload9.exceptions">Exceptions</a> 91 </h6> 92<div class="variablelist"> 93<p class="title"><b></b></p> 94<dl class="variablelist"> 95<dt><span class="term">boost::system::system_error</span></dt> 96<dd><p> 97 Thrown on failure. 98 </p></dd> 99</dl> 100</div> 101<h6> 102<a name="boost_asio.reference.ip__basic_resolver.resolve.overload9.h3"></a> 103 <span class="phrase"><a name="boost_asio.reference.ip__basic_resolver.resolve.overload9.remarks"></a></span><a class="link" href="overload9.html#boost_asio.reference.ip__basic_resolver.resolve.overload9.remarks">Remarks</a> 104 </h6> 105<p> 106 On POSIX systems, host names may be locally defined in the file <code class="computeroutput">/etc/hosts</code>. 107 On Windows, host names may be defined in the file <code class="computeroutput">c:\windows\system32\drivers\etc\hosts</code>. 108 Remote host name resolution is performed using DNS. Operating systems 109 may use additional locations when resolving host names (such as NETBIOS 110 names on Windows). 111 </p> 112<p> 113 On POSIX systems, service names are typically defined in the file <code class="computeroutput">/etc/services</code>. 114 On Windows, service names may be found in the file <code class="computeroutput">c:\windows\system32\drivers\etc\services</code>. 115 Operating systems may use additional locations when resolving service 116 names. 117 </p> 118</div> 119<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 120<td align="left"></td> 121<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 122 Kohlhoff<p> 123 Distributed under the Boost Software License, Version 1.0. (See accompanying 124 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 125 </p> 126</div></td> 127</tr></table> 128<hr> 129<div class="spirit-nav"> 130<a accesskey="p" href="overload8.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../resolve.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../boost_asio.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="overload10.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 131</div> 132</body> 133</html> 134
