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Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
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<td width="20%" align="left"><a accesskey="p" href="envset_memory_max.html">Prev</a> </td>
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The DbEnv Handle
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<div class="sect1" lang="en" xml:lang="en">
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<h2 class="title" style="clear: both"><a id="envset_message_stream"></a>DbEnv::set_message_stream()</h2>
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<pre class="programlisting">#include &lt;db_cxx.h&gt;
void DbEnv::set_message_stream(class ostream*); </pre>
<p>
There are interfaces in the Berkeley DB library which either
directly output informational messages or statistical
information, or configure the library to output such messages
when performing other operations. For example, the
<a class="xref" href="envset_verbose.html" title="DbEnv::set_verbose()">DbEnv::set_verbose()</a>
and
<a class="xref" href="envstat.html" title="DbEnv::stat_print()">DbEnv::stat_print()</a>
methods.
</p>
<p>
The <code class="methodname">DbEnv::set_message_stream()</code> and
<a class="xref" href="dbset_message_stream.html" title="Db::set_message_stream()">Db::set_message_stream()</a>
methods are used to display these messages for the application. In this case,
the message will include a trailing <code class="literal">&lt;newline&gt;</code> character.
</p>
<p>
Setting <span class="bold"><strong>stream</strong></span> to NULL unconfigures the interface.
</p>
<p>
Alternatively, you can use the
<a class="xref" href="envset_msgfile.html" title="DbEnv::set_msgfile()">DbEnv::set_msgfile()</a> or
<a class="xref" href="dbset_msgfile.html" title="Db::set_msgfile()">Db::set_msgfile()</a> methods
to display the additional information via a C Library <code class="literal">FILE *</code>,
or the <a class="xref" href="envset_msgcall.html" title="DbEnv::set_msgcall()">DbEnv::set_msgcall()</a>
and <a class="xref" href="dbset_msgcall.html" title="Db::set_msgcall()">Db::set_msgcall()</a>
methods to capture the additional error information in a way that does not use either
output streams or C Library <code class="literal">FILE *</code>'s.
You should not mix these approaches.
</p>
<p>
The <code class="methodname">DbEnv::set_message_stream()</code> method configures
operations performed using the specified <a class="link" href="env.html" title="Chapter 5.  The DbEnv Handle">DbEnv</a>
handle, not all operations performed on the underlying database environment.
</p>
<p>
The <code class="methodname">DbEnv::set_message_stream()</code> method may be called at any time during the
life of the application.
</p>
<div class="sect2" lang="en" xml:lang="en">
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Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h3 class="title"><a id="id3606228"></a>Parameters</h3>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
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<div class="sect3" lang="en" xml:lang="en">
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Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h4 class="title"><a id="id3606231"></a>stream</h4>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<p>
The <span class="bold"><strong>stream</strong></span> parameter is the
application-specified output stream to be used for additional message
information.
</p>
</div>
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<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
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Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h3 class="title"><a id="id3605450"></a>Class</h3>
Release 5.2.28 on 6/10/2011
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<p>
<a class="link" href="env.html" title="Chapter 5.  The DbEnv Handle">DbEnv</a>
</p>
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Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h3 class="title"><a id="id3606086"></a>See Also</h3>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
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<p>
<a class="xref" href="env.html#envlist" title="Database Environments and Related Methods">Database Environments and Related Methods</a>
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