2011-09-13 17:44:24 +00:00
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<title>Db::set_msgfile()</title>
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<p>Library Version 11.2.5.2</p>
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<table width="100%" summary="Navigation header">
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<th colspan="3" align="center">Db::set_msgfile()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="dbset_msgcall.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="dbset_pagesize.html">Next</a></td>
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<div>
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<h2 class="title" style="clear: both"><a id="dbset_msgfile"></a>Db::set_msgfile()</h2>
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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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void Db::set_msgfile(FILE *msgfile); </pre>
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<p>
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There are interfaces in the Berkeley DB library which either directly
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output informational messages or statistical information, or configure
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the library to output such messages when performing other operations,
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for example,
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<a class="xref" href="envset_verbose.html" title="DbEnv::set_verbose()">DbEnv::set_verbose()</a> and
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<a class="xref" href="envstat.html" title="DbEnv::stat_print()">DbEnv::stat_print()</a>.
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</p>
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<p>
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The <a class="xref" href="envset_msgfile.html" title="DbEnv::set_msgfile()">DbEnv::set_msgfile()</a> and
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<code class="methodname">Db::set_msgfile()</code> methods are used to display these messages for the
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application. In this case the message will include a trailing
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<newline> character.
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</p>
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<p>
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Setting <span class="bold"><strong>msgfile</strong></span> to NULL unconfigures
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the interface.
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</p>
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<p>
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Alternatively, you can use the
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<span>
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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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methods to display the messages via an output stream, or the
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</span>
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<a class="xref" href="envset_msgcall.html" title="DbEnv::set_msgcall()">DbEnv::set_msgcall()</a> or
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<a class="xref" href="dbset_msgcall.html" title="Db::set_msgcall()">Db::set_msgcall()</a>
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methods to capture the additional error information in a way that does
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not use C library FILE *'s.
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<span>You should not mix these approaches.</span>
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</p>
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<p>
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For <a class="link" href="db.html" title="Chapter 2. The Db Handle">Db</a> handles opened
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inside of Berkeley DB environments, calling the <code class="methodname">Db::set_msgfile()</code>
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method affects the entire environment and is equivalent to calling the
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<a class="xref" href="envset_msgfile.html" title="DbEnv::set_msgfile()">DbEnv::set_msgfile()</a>
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method.
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</p>
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<p>
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The <code class="methodname">Db::set_msgfile()</code> method configures operations performed using
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the specified <a class="link" href="db.html" title="Chapter 2. The Db Handle">Db</a> handle,
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not all operations performed on the underlying database.
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</p>
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<p>
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The <code class="methodname">Db::set_msgfile()</code> method may be called at any time during the
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life of the application.
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</p>
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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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3578943"></a>Parameters</h3>
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2011-09-13 17:44:24 +00:00
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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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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3578947"></a>msgfile</h4>
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2011-09-13 17:44:24 +00:00
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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>msgfile</strong></span> parameter is a C library
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FILE * to be used for displaying messages.
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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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3578578"></a>Class</h3>
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2011-09-13 17:44:24 +00:00
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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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3578888"></a>See Also</h3>
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2011-09-13 17:44:24 +00:00
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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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<td width="40%" align="left"><a accesskey="p" href="dbset_msgcall.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="dbset_pagesize.html">Next</a></td>
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<td width="40%" align="left" valign="top">Db::set_msgcall() </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 width="40%" align="right" valign="top"> Db::set_pagesize()</td>
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