mirror of
https://github.com/yasuhirokimura/db18
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Yasuhiro KIMURA
238 lines
8.5 KiB
HTML
238 lines
8.5 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Db::msg()</title>
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<link rel="stylesheet" href="apiReference.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C++ API Reference" />
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<link rel="up" href="db.html" title="Chapter 2. The Db Handle" />
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<link rel="prev" href="dbkey_range.html" title="Db::key_range()" />
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<link rel="next" href="dbopen.html" title="Db::open()" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 18.1.40</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">
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<span xmlns="http://www.w3.org/1999/xhtml">Db::msg()</span>
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</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="dbkey_range.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 2.
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The Db Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="dbopen.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="dbmsg"></a>
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<span>Db::msg()</span>
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</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db_cxx.h>
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Db::msg(const char *fmt, ...); </pre>
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<p>
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The <a class="xref" href="envmsg.html" title="DbEnv::msg()">
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<span>DbEnv::msg()</span>
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</a> and
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<code class="methodname">Db::msg()</code>
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methods provide informational messaging functionality for
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applications written using the Berkeley DB library.
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</p>
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<p>
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The <code class="methodname">Db::msg()</code> and <a class="xref" href="envmsg.html" title="DbEnv::msg()">
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<span>DbEnv::msg()</span>
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</a> methods construct
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an informational message consisting of the following elements:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<span class="bold"><strong>An optional prefix string</strong></span>
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</p>
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<p>
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If no informational callback function has been set using the
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<a class="xref" href="envset_msgcall.html" title="DbEnv::set_msgcall()">
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<span>DbEnv::set_msgcall()</span>
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</a>
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method, any prefix string specified using the
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<a class="xref" href="envset_msgpfx.html" title="DbEnv::set_msgpfx()">
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<span>DbEnv::set_msgpfx()</span>
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</a>
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method.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>An optional printf-style message</strong></span>
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</p>
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<p>
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The supplied message <span class="bold"><strong>fmt</strong></span>, if
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non-NULL, in which the ANSI C X3.159-1989 (ANSI C) printf function
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specifies how subsequent parameters are converted for output.
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</p>
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</li>
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</ul>
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</div>
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<p>
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This constructed informational message is then handled as follows:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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If an informational callback function has been set (see
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<a class="xref" href="dbset_msgcall.html" title="Db::set_msgcall()">
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<span>Db::set_msgcall()</span>
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</a> and
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<a class="xref" href="envset_msgcall.html" title="DbEnv::set_msgcall()">
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<span>DbEnv::set_msgcall()</span>
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</a>),
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that function is called with two parameters: any prefix string
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specified (see <a class="xref" href="dbset_msgpfx.html" title="Db::set_msgpfx()">
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<span>Db::set_msgpfx()</span>
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</a>
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and <a class="xref" href="envset_msgpfx.html" title="DbEnv::set_msgpfx()">
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<span>DbEnv::set_msgpfx()</span>
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</a>) and
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the informational message.
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</p>
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</li>
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<li>
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<p>
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If a C library FILE * has been set (see
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<a class="xref" href="dbset_msgfile.html" title="Db::set_msgfile()">
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<span>Db::set_msgfile()</span>
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</a> and
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<a class="xref" href="envset_msgfile.html" title="DbEnv::set_msgfile()">
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<span>DbEnv::set_msgfile()</span>
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</a>),
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the informational message is written to that output stream.
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</p>
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</li>
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<li>
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<p>
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If a C++ ostream has been set (see
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<a class="xref" href="envset_message_stream.html" title="DbEnv::set_message_stream()">DbEnv::set_message_stream()</a>
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and
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<a class="xref" href="dbset_message_stream.html" title="Db::set_message_stream()">Db::set_message_stream()</a>),
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the informational message is written to that stream.
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</p>
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</li>
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<li>
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<p>
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If none of these output options have been configured, the informational message
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is written to stdout, the standard output stream.
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</p>
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</li>
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</ul>
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</div>
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<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<h3 class="title">Note</h3>
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<p>
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The total length of the message written by this method,
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including the prefix string, can be no longer than 4096.
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="idm139755620136816"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="idm139755620134016"></a>fmt</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>fmt</strong></span> parameter is an optional
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printf-style message to display.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="idm139755621577408"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="db.html" title="Chapter 2. The Db Handle">Db</a>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="idm139755620907984"></a>See Also</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="db.html#dblist" title="Database and Related Methods">Database and Related Methods</a>
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</p>
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</div>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="dbkey_range.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="db.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="dbopen.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">
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<span>Db::key_range()</span>
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</td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top">
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<span>Db::open()</span>
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</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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