Hi,<div>I am extending the boost::log backend sink to show log record into GUI ListBox control, which is gui_logger.</div><div>I modify based on the app_luncher example which extends backend sink of&nbsp;:basic_formatted_sink_backend.</div><div>Below are the questions that I have for now:</div><div>1) when modifying the consume function, I don't know how to get the message body.</div><div>&nbsp; &nbsp; &nbsp; &nbsp; void consume(logging::record_view const&amp; rec, string_type const&amp; command_line);</div><div>&nbsp; &nbsp; I using TRACE of visualstudio 2015 to first log the message out into vs2015 console. But I don't know how the get the message from record_view?</div><div><br></div><div>2) When I TRACE(command_line.c_str()) of consume function, I logged every record out into vs2015 console. I need to set a filter to only output some of the log.&nbsp;</div><div>&nbsp; &nbsp; How to set filters with gui_logger?</div><div><br></div><div>&nbsp; &nbsp; I notice there is sink-&gt;set_filter function, but I don't know how to set in my situation.In my scenario, I setup a src::severity_channel_logger (db_logger) with keywords::channel = "dblog", which output to db.log file. I want to use gui_logger to show the latest 200 records on the ListBox. gui_logger should use the same filter with db_logger.&nbsp;</div><div><span style="color: rgb(51, 162, 189); font-family: Helvetica; font-size: 9.5px; background-color: rgb(0, 0, 0);"></span></div><div>&nbsp; &nbsp; gui_logger log the latest 200 records into gui ListBox.</div><div>&nbsp; &nbsp; db_logger log all the records into text file.</div><div>&nbsp; &nbsp; So I need to set the same filter with db_logger.</div><div><br></div><div>3) I read settings from the ini file for db_logger. I want also to read setting from ini file for gui_logger. How to do it?</div>