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<!--$Id: db_err.so,v 1.3 2002/08/18 21:15:48 bostic Exp $--> <!--$Id: env_err.so,v 10.34 2006/04/27 20:17:47 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: Db::err</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td> <b>Db::err</b> </td> <td align=right> <a href="../../db4-devel-4.7.25/api_cxx/api_core.html"><img src="../../db4-devel-4.7.25/images/api.gif" alt="API"></a> <a href="../../db4-devel-4.7.25/ref/toc.html"><img src="../../db4-devel-4.7.25/images/ref.gif" alt="Ref"></a></td> </tr></table> <hr size=1 noshade> <tt> <b><pre> #include <db_cxx.h> <p> Db::err(int error, const char *fmt, ...); <p> Db::errx(const char *fmt, ...); </pre></b> <hr size=1 noshade> <b>Description: Db::err</b> <p>The <a href="../../db4-devel-4.7.25/api_cxx/env_err.html">DbEnv::err</a>, <a href="../../db4-devel-4.7.25/api_cxx/env_err.html">DbEnv::errx</a>, Db::err and Db::errx methods provide error-messaging functionality for applications written using the Berkeley DB library.</p> <p>The Db::err and <a href="../../db4-devel-4.7.25/api_cxx/env_err.html">DbEnv::err</a> methods constructs an error message consisting of the following elements:</p> <blockquote><br> <b>An optional prefix string</b><ul compact><li>If no error callback function has been set using the <a href="../../db4-devel-4.7.25/api_cxx/env_set_errcall.html">DbEnv::set_errcall</a> method, any prefix string specified using the <a href="../../db4-devel-4.7.25/api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a> method, followed by two separating characters: a colon and a <space> character.</ul> <b>An optional printf-style message</b><ul compact><li>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.</ul> <b>A separator</b><ul compact><li>Two separating characters: a colon and a <space> character.</ul> <b>A standard error string</b><ul compact><li>The standard system or Berkeley DB library error string associated with the <b>error</b> value, as returned by the <a href="../../db4-devel-4.7.25/api_cxx/env_strerror.html">DbEnv::strerror</a> method.</ul> <br> </blockquote> <p>The Db::errx and <a href="../../db4-devel-4.7.25/api_cxx/env_err.html">DbEnv::errx</a> methods are the same as the Db::err and <a href="../../db4-devel-4.7.25/api_cxx/env_err.html">DbEnv::err</a> methods, except they do not append the final separator characters and standard error string to the error message.</p> <p>This constructed error message is then handled as follows:</p> <blockquote><p>If an error callback function has been set (see <a href="../../db4-devel-4.7.25/api_cxx/db_set_errcall.html">Db::set_errcall</a> and <a href="../../db4-devel-4.7.25/api_cxx/env_set_errcall.html">DbEnv::set_errcall</a>), that function is called with two parameters: any prefix string specified (see <a href="../../db4-devel-4.7.25/api_cxx/db_set_errpfx.html">Db::set_errpfx</a> and <a href="../../db4-devel-4.7.25/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="../../db4-devel-4.7.25/api_cxx/db_set_errfile.html">Db::set_errfile</a> and <a href="../../db4-devel-4.7.25/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="../../db4-devel-4.7.25/api_cxx/env_set_error_stream.html">DbEnv::set_error_stream</a> and <a href="../../db4-devel-4.7.25/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> <b>Parameters</b> <br> <b>error</b><ul compact><li>The <b>error</b> parameter is the error value for which the <a href="../../db4-devel-4.7.25/api_cxx/env_err.html">DbEnv::err</a> and Db::err methods will display a explanatory string.</ul> <b>fmt</b><ul compact><li>The <b>fmt</b> parameter is an optional printf-style message to display.</ul> <br> <hr size=1 noshade> <br><b>Class</b> <a href="../../db4-devel-4.7.25/api_cxx/db_class.html">Db</a> <br><b>See Also</b> <a href="../../db4-devel-4.7.25/api_cxx/db_list.html">Databases and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db4-devel-4.7.25/api_cxx/api_core.html"><img src="../../db4-devel-4.7.25/images/api.gif" alt="API"></a><a href="../../db4-devel-4.7.25/ref/toc.html"><img src="../../db4-devel-4.7.25/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2008 Oracle. 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