Is it possible to retrieve the logged message as a string from boost::log::record_view?

Question

The documentation of record_view states that it encapsulates the log message string.

I'd like to retrieve it in the context of the consume function of a custom basic_string_backend subclass.

Is it possible, or do I have to derive from basic_formatted_sink_backend?

I suppose you could always store a local copy the logged string in parallel somewhere else (which is what we do in our wrapper for boost.log) — Jay, Jan 29 '14 at 16:41

Nathan Monteleone · Accepted Answer · 2014-09-17T17:53:23.173

4

You can get it like this:

void consume(boost::logger::record_view const& rec)
{
    std::string myString = *rec[boost::logger::expressions::smessage];
    // etc...
}

Include boost/logger/expressions.h to get boost::logger::expressions::smessage.

edited Sep 17 '14 at 17:53

answered Sep 17 '14 at 17:29

Nathan Monteleone

2

Where the hell is all of this documented? I find Boost.Log incredibly complex and confusing, but their documentation isn't exactly helpful. I've seen no information in the docs on how to use the `record_view` object. – void.pointer Aug 03 '15 at 21:48
@void.pointer It's been too long, I have no idea where I found this initially :) It does show up in one of the examples under Log Record Formatting / Custom Formatting Functions: http://www.boost.org/doc/libs/1_58_0/libs/log/doc/html/log/tutorial/formatters.html#log.tutorial.formatters.custom_formatting_functions – Nathan Monteleone Aug 11 '15 at 12:46
I am going to give up on using it, I am trying to set it up and it is too difficult – Germán Diago Jun 23 '16 at 10:28

1 Answers1