<!--$Id: env_set_feedback.so,v 10.40 2003/11/08 19:17:29 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::set_feedback</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::set_feedback</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> int DbEnv::set_feedback( void (*db_feedback_fcn)(DbEnv *dbenv, int opcode, int percent)); </pre></h3> <hr size=1 noshade> <h3>Description: DbEnv::set_feedback</h3> <p>Some operations performed by the Berkeley DB library can take non-trivial amounts of time. The DbEnv::set_feedback method can be used by applications to monitor progress within these operations. When an operation is likely to take a long time, Berkeley DB will call the specified callback function with progress information.</p> <p>It is up to the callback function to display this information in an appropriate manner.</p> <p>The DbEnv::set_feedback method configures operations performed using the specified <a href="../../db42-devel-4.2.52/api_cxx/env_class.html">DbEnv</a> handle <p>The DbEnv::set_feedback method may be called at any time during the life of the application.</p> <p>The DbEnv::set_feedback method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success. </p> <h3>Parameters</h3> <p><dl compact> <p><dt><b>db_feedback_fcn</b><dd> The <b>db_feedback_fcn</b> parameter is the application-specified feedback function called to report Berkeley DB operation progress. The callback function must take three parameters: <p><dl compact> <p><dt><b>dbenv</b><dd>The <b>dbenv</b> parameter is a reference to the enclosing database environment. <p><dt><b>opcode</b><dd>The <b>opcode</b> parameter is an operation code. The <b>opcode</b> parameter may take on any of the following values: <p><dl compact> <p><dt><a name="DB_RECOVER">DB_RECOVER</a><dd>The environment is being recovered. </dl> <p><dt><b>percent</b><dd>The <b>percent</b> parameter is the percent of the operation that has been completed, specified as an integer value between 0 and 100. </dl> </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>