<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>DbEnv::set_msgfile()</title> <link rel="stylesheet" href="apiReference.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> <link rel="start" href="index.html" title="Berkeley DB C++ API Reference" /> <link rel="up" href="env.html" title="Chapter 5. The DbEnv Handle" /> <link rel="prev" href="envset_msgcall.html" title="DbEnv::set_msgcall()" /> <link rel="next" href="envset_shm_key.html" title="DbEnv::set_shm_key()" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">DbEnv::set_msgfile()</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="envset_msgcall.html">Prev</a> </td> <th width="60%" align="center">Chapter 5. The DbEnv Handle </th> <td width="20%" align="right"> <a accesskey="n" href="envset_shm_key.html">Next</a></td> </tr> </table> <hr /> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="envset_msgfile"></a>DbEnv::set_msgfile()</h2> </div> </div> </div> <pre class="programlisting">#include <db_cxx.h> void DbEnv::set_msgfile(FILE *msgfile); </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, <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>. </p> <p> The <code class="methodname">DbEnv::set_msgfile()</code> and <a class="xref" href="dbset_msgfile.html" title="Db::set_msgfile()">Db::set_msgfile()</a> methods are used to display these messages for the application. In this case the message will include a trailing <newline> character. </p> <p> Setting <span class="bold"><strong>msgfile</strong></span> to NULL unconfigures the interface. </p> <p> Alternatively, you can use the <span> <a class="xref" href="envset_message_stream.html" title="DbEnv::set_message_stream()">DbEnv::set_message_stream()</a> and <a class="xref" href="dbset_message_stream.html" title="Db::set_message_stream()">Db::set_message_stream()</a> methods to display the messages via an output stream, or the </span> <a class="xref" href="envset_msgcall.html" title="DbEnv::set_msgcall()">DbEnv::set_msgcall()</a> or <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 C library FILE *'s. <span>You should not mix these approaches.</span> </p> <p> The <code class="methodname">DbEnv::set_msgfile()</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_msgfile()</code> method may be called at any time during the life of the application. </p> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="id1674210"></a>Parameters</h3> </div> </div> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="id1674246"></a>msgfile</h4> </div> </div> </div> <p> The <span class="bold"><strong>msgfile</strong></span> parameter is a C library FILE * to be used for displaying messages. </p> </div> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="id1674497"></a>Class</h3> </div> </div> </div> <p> <a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a> </p> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="id1674389"></a>See Also</h3> </div> </div> </div> <p> <a class="xref" href="env.html#envlist" title="Database Environments and Related Methods">Database Environments and Related Methods</a> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="envset_msgcall.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="env.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="envset_shm_key.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">DbEnv::set_msgcall() </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> DbEnv::set_shm_key()</td> </tr> </table> </div> </body> </html>