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<!--$Id: env_set_msgcall.so,v 10.7 2006/05/17 20:47:46 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DbEnv::set_msgcall</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>DbEnv::set_msgcall</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> void DbEnv::set_msgcall(void (*db_msgcall_fcn)(const DbEnv *dbenv, const char *msg)); </pre></b> <hr size=1 noshade> <b>Description: DbEnv::set_msgcall</b> <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 href="../../db4-devel-4.7.25/api_cxx/env_set_verbose.html">DbEnv::set_verbose</a> and <a href="../../db4-devel-4.7.25/api_cxx/env_stat.html">DbEnv::stat_print</a>.</p> <p>The DbEnv::set_msgcall and Db::set_msgcall methods are used to pass these messages to the application, and Berkeley DB will call <b>db_msgcall_fcn</b> with each message. It is up to the <b>db_msgcall_fcn</b> function to display the message in an appropriate manner.</p> <p>Setting <b>db_msgcall_fcn</b> to NULL unconfigures the callback interface.</p> <p>Alternatively, you can use the <a href="../../db4-devel-4.7.25/api_cxx/env_set_msg_stream.html">DbEnv::set_message_stream</a> and <a href="../../db4-devel-4.7.25/api_cxx/db_set_msg_stream.html">Db::set_message_stream</a> methods to display the messages via an output stream, or the <a href="../../db4-devel-4.7.25/api_cxx/db_set_msgfile.html">Db::set_msgfile</a> or <a href="../../db4-devel-4.7.25/api_cxx/env_set_msgfile.html">DbEnv::set_msgfile</a> methods to display the messages via a C library FILE *.</p> <p>The DbEnv::set_msgcall method configures operations performed using the specified <a href="../../db4-devel-4.7.25/api_cxx/env_class.html">DbEnv</a> handle, not all operations performed on the underlying database environment.</p> <p>The DbEnv::set_msgcall method may be called at any time during the life of the application.</p> <b>Parameters</b> <br> <b>db_msgcall_fcn</b><ul compact><li>The <b>db_msgcall_fcn</b> parameter is the application-specified message reporting function. The function takes two parameters: <br> <b><b>dbenv</b></b><ul compact><li>The <b>dbenv</b> parameter is the enclosing database environment.</ul> <b><b>msg</b></b><ul compact><li>The <b>msg</b> parameter is the message string.</ul> <br></ul> <p>Berkeley DB is not re-entrant. Callback functions should not attempt to make library calls (for example, to release locks or close open handles). Re-entering Berkeley DB is not guaranteed to work correctly, and the results are undefined.</p> <br> <hr size=1 noshade> <br><b>Class</b> <a href="../../db4-devel-4.7.25/api_cxx/env_class.html">DbEnv</a> <br><b>See Also</b> <a href="../../db4-devel-4.7.25/api_cxx/env_list.html">Database Environments 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. All rights reserved.</font> </body> </html>
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