<!--$Id: env_err.so,v 10.30 2003/11/08 19:17:27 bostic Exp $--> <!--Copyright 1997-2003 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DbEnv::err</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <a name="2"><!--meow--></a> <table width="100%"><tr valign=top> <td> <h3>DbEnv::err</h3> </td> <td align=right> <a href="../../db42-devel-4.2.52/api_cxx/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a> <a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <hr size=1 noshade> <tt> <h3><pre> #include <db_cxx.h> <p> DbEnv::err(int error, const char *fmt, ...); <p> DbEnv::errx(const char *fmt, ...); </pre></h3> <hr size=1 noshade> <h3>Description: DbEnv::err</h3> <a name="3"><!--meow--></a> <p>The DbEnv::err, DbEnv::errx, <a href="../../db42-devel-4.2.52/api_cxx/db_err.html">Db::err</a> and <a href="../../db42-devel-4.2.52/api_cxx/db_err.html">Db::errx</a> methods provide error-messaging functionality for applications written using the Berkeley DB library.</p> <p>The DbEnv::err method constructs an error message consisting of the following elements:</p> <blockquote><p><dl compact> <p><dt>An optional prefix string<dd>If no error callback function has been set using the <a href="../../db42-devel-4.2.52/api_cxx/env_set_errcall.html">DbEnv::set_errcall</a> method, any prefix string specified using the <a href="../../db42-devel-4.2.52/api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a> method, followed by two separating characters: a colon and a <space> character. <p><dt>An optional printf-style message<dd>The supplied message <b>fmt</b>, if non-NULL, in which the ANSI C X3.159-1989 (ANSI C) printf function specifies how subsequent parameters are converted for output. <p><dt>A separator<dd>Two separating characters: a colon and a <space> character. <p><dt>A standard error string<dd>The standard system or Berkeley DB library error string associated with the <b>error</b> value, as returned by the <a href="../../db42-devel-4.2.52/api_cxx/env_strerror.html">DbEnv::strerror</a> method. </dl> </blockquote> <p>This constructed error message is then handled as follows:</p> <blockquote><p>If an error callback function has been set (see <a href="../../db42-devel-4.2.52/api_cxx/db_set_errcall.html">Db::set_errcall</a> and <a href="../../db42-devel-4.2.52/api_cxx/env_set_errcall.html">DbEnv::set_errcall</a>), that function is called with two parameters: any prefix string specified (see <a href="../../db42-devel-4.2.52/api_cxx/db_set_errpfx.html">Db::set_errpfx</a> and <a href="../../db42-devel-4.2.52/api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a>) and the error message.</p> <p>If a C library FILE * has been set (see <a href="../../db42-devel-4.2.52/api_cxx/db_set_errfile.html">Db::set_errfile</a> and <a href="../../db42-devel-4.2.52/api_cxx/env_set_errfile.html">DbEnv::set_errfile</a>), the error message is written to that output stream.</p> <p>If a C++ ostream has been set (see <a href="../../db42-devel-4.2.52/api_cxx/env_set_error_stream.html">DbEnv::set_error_stream</a> and <a href="../../db42-devel-4.2.52/api_cxx/db_set_error_stream.html">Db::set_error_stream</a>), the error message is written to that stream.</p> <p>If none of these output options has been configured, the error message is written to stderr, the standard error output stream.</p></blockquote> <p>The DbEnv::errx and <a href="../../db42-devel-4.2.52/api_cxx/db_err.html">Db::errx</a> methods perform identically to the DbEnv::err and <a href="../../db42-devel-4.2.52/api_cxx/db_err.html">Db::err</a> methods, except that they do not append the final separator characters and standard error string to the error message.</p> <h3>Parameters</h3> <p><dl compact> <p><dt><b>error</b><dd> The <b>error</b> parameter is the error value for which the DbEnv::err and <a href="../../db42-devel-4.2.52/api_cxx/db_err.html">Db::err</a> methods will display a explanatory string. <p><dt><b>fmt</b><dd> The <b>fmt</b> parameter is an optional printf-style message to display. </dl> <hr size=1 noshade> <h3>Class</h3> <a href="../../db42-devel-4.2.52/api_cxx/env_class.html">DbEnv</a> <h3>See Also</h3> <a href="../../db42-devel-4.2.52/api_cxx/env_list.html">Database Environments and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db42-devel-4.2.52/api_cxx/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a><a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1><a href="../../db42-devel-4.2.52/sleepycat/legal.html">Copyright (c) 1996-2003</a> <a href="http://www.sleepycat.com">Sleepycat Software, Inc.</a> - All rights reserved.</font> </body> </html>
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