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<title>Berkeley DB: Db::set_errfile</title>
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<h1>Db::set_errfile</h1>
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<h3><pre>
#include &lt;db_cxx.h&gt;
<p>
void Db::set_errfile(FILE *errfile);
</pre></h3>
<h1>Description</h1>
When an error occurs in the Berkeley DB library, an exception is thrown or an
error return value is returned by the method.  In some cases,
however, the <b>errno</b> value may be insufficient to completely
describe the cause of the error, especially during initial application
debugging.
<p>The Db::set_errfile method is used to enhance the mechanism for reporting error
messages to the application by setting a C library FILE * to be used for
displaying additional Berkeley DB error messages.  In some cases, when an error
occurs, Berkeley DB will output an additional error message to the specified
file reference.
<p>Alternatively, you can use the <a href="../api_cxx/env_set_error_stream.html">DbEnv::set_error_stream</a> method to display
the additional information via an output stream, or the
<a href="../api_cxx/env_set_errcall.html">DbEnv::set_errcall</a> method to capture the additional error information in
a way that does not use either output streams or C library FILE *'s.  You
should not mix these approaches.
<p>The error message will consist of the prefix string and a colon
("<b>:</b>") (if a prefix string was previously specified using
<a href="../api_cxx/db_set_errpfx.html">Db::set_errpfx</a> or <a href="../api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a>), an error string, and
a trailing &lt;newline&gt; character.
<p>This error logging enhancement does not slow performance or significantly
increase application size, and may be run during normal operation as well
as during application debugging.
<p>For <a href="../api_cxx/db_class.html">Db</a> handles opened inside of Berkeley DB environments, calling the
Db::set_errfile method affects the entire environment and is equivalent to calling
the <a href="../api_cxx/env_set_errfile.html">DbEnv::set_errfile</a> method.
<p>The Db::set_errfile interface may be used to configure Berkeley DB at any time
during the life of the application.
<h3>Class</h3>
<a href="../api_cxx/dbenv_class.html">DbEnv</a>
<h1>See Also</h1>
<a href="../api_cxx/env_close.html">DbEnv::close</a>,
<a href="../api_cxx/env_open.html">DbEnv::open</a>,
<a href="../api_cxx/env_remove.html">DbEnv::remove</a>,
<a href="../api_cxx/db_err.html">DbEnv::err</a>,
<a href="../api_cxx/env_strerror.html">DbEnv::strerror</a>,
<a href="../api_cxx/env_version.html">DbEnv::version</a>,
<a href="../api_cxx/env_set_cachesize.html">DbEnv::set_cachesize</a>,
<a href="../api_cxx/env_set_errcall.html">DbEnv::set_errcall</a>,
<a href="../api_cxx/env_set_errfile.html">DbEnv::set_errfile</a>,
<a href="../api_cxx/env_set_error_stream.html">DbEnv::set_error_stream</a>,
<a href="../api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a>,
<a href="../api_cxx/env_set_flags.html">DbEnv::set_flags</a>,
<a href="../api_cxx/env_set_mutexlocks.html">DbEnv::set_mutexlocks</a>,
<a href="../api_cxx/env_set_paniccall.html">DbEnv::set_paniccall</a>,
and
<a href="../api_cxx/env_set_verbose.html">DbEnv::set_verbose</a>.
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