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<h2 class="title" style="clear: both"><a id="dbset_message_stream"></a>Db::set_message_stream()</h2>
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<pre class="programlisting">#include <db_cxx.h>
void Db::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.
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<p>
The <a class="xref" href="envset_message_stream.html" title="DbEnv::set_message_stream()">DbEnv::set_message_stream()</a>
and <code class="methodname">Db::set_message_stream()</code> methods are used
to display these messages for the application. In this case, the message will include a
trailing <code class="literal"><newline></code> character.
</p>
<p>
Setting <span class="bold"><strong>stream</strong></span> to NULL unconfigures the interface.
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<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>
For <a class="link" href="db.html" title="Chapter 2. The Db Handle">Db</a> handles opened inside of Berkeley DB
environments, calling the <code class="methodname">Db::set_message_stream()</code> method
affects the entire environment and is equivalent to calling the
<a class="xref" href="envset_message_stream.html" title="DbEnv::set_message_stream()">DbEnv::set_message_stream()</a> method.
</p>
<p>
The <code class="methodname">Db::set_message_stream()</code> method configures
operations performed using the specified
<a class="link" href="db.html" title="Chapter 2. The Db Handle">Db</a>
handle, not all operations performed on the underlying database.
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<p>
The <code class="methodname">Db::set_message_stream()</code> method may be called at any time during the
life of the application.
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<h3 class="title"><a id="id1649326"></a>Parameters</h3>
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<h4 class="title"><a id="id1649321"></a>stream</h4>
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<p>
The <span class="bold"><strong>stream</strong></span> parameter is the
application-specified output stream to be used for additional message
information.
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<h3 class="title"><a id="id1649469"></a>Class</h3>
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<a class="link" href="db.html" title="Chapter 2. The Db Handle">Db</a>
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<h3 class="title"><a id="id1649280"></a>See Also</h3>
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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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