Re: [Boost-users] [Log] How to use?

Subject: Re: [Boost-users] [Log] How to use?
From: Olivier Tournaire (olitour_at_[hidden])
Date: 2010-08-20 12:24:12

Hi,

Thanks for your answer.

2010/8/20 Oskar Nordquist <oskar.nordquist_at_[hidden]>

> Hi,
>
> Just a wild guess:
>
> Since the difference between your test program and the Boost example is
> that you are doing all the preparations in the constructor, whilst Boost
> example has everything in the main() scope. My guess is something goes out
> of scope at the end of the constructor, and some attribute is unregistered
> and thus generates "missing attribute" exception.
>

Maybe it is a problem with the singleton? No one experienced such a problem?
I tried a really simple program found in the documentation (
http://boost-log.sourceforge.net/libs/log/doc/html/log/detailed/attributes.html#log.detailed.attributes.timer)
which uses a class. The result is the same: it throws the same exception in
the destructor.

Regards,

Olivier

>
> Regards,
> Oskar
>
>
> 2010/8/19 Olivier Tournaire <olitour_at_[hidden]>
>
>> Hi all,
>>
>> Sorry to insist, but can someone help on boost::logging? Is there a
>> dedicated mailing list?
>>
>> Regards,
>>
>> Olivier
>>
>> 2010/8/17 Olivier Tournaire <olitour_at_[hidden]>
>>
>>> Hi all,
>>>
>>> i am currently trying to use Boost.Log in my application. After fighting
>>> the two last days, I still do not understand how to correctly use the lib. I
>>> would like the result to be the same as the one provided by the example
>>> advanced_use.cpp. So, I wrote a simple class to make some tests.
>>> As I want to use the logging library in a shared library (an application
>>> plugin), I made a simple test: compile the class which uses Log in a shared
>>> library and link an executable against this library. I also have created an
>>> executable which directly compiles the class (so does not link against the
>>> shared library). Basically, I have a test_boost_log class. The constructor
>>> is a copy/paste of the code from the example advanced_use.cpp:
>>>
>>>   [snip]
>>>
>>>  test_boost_log::test_boost_log()
>>>
>>> {
>>>
>>>     [...]
>>>
>>> }
>>>
>>>
>>> I have added another method to test the logger state:
>>>
>>>    void test_boost_log::a_test_method_to_see_if_the_logger_is_still_working()
>>>
>>> {
>>>
>>>     src::severity_logger< severity_level > slg;
>>>
>>>     BOOST_LOG_SEV(slg, error) << "An error severity message, will pass to the output";
>>>
>>> }
>>>
>>> My main:
>>>
>>>   #include "test_boost_log.hpp"
>>>
>>>  int main(int argc, char** argv)
>>>
>>> {
>>>
>>>     test_boost_log tbl;
>>>
>>>     tbl.a_test_method_to_see_if_the_logger_is_still_working();
>>>
>>>     return 0;
>>>
>>> }
>>>
>>> Here is the output of the program:
>>>
>>> Hello, World!
>>> 1 [17.08.2010 21:22:43.083302] [] [00:00:00.000076]
>>> [test_boost_log::test_boost_log()] Some log line with a counter
>>> 2 [17.08.2010 21:22:43.083445] [] [00:00:00.000217]
>>> [test_boost_log::test_boost_log()] Another log line with the counter
>>> 3 [17.08.2010 21:22:43.083484] [] [00:00:00.000256] [Tagged line]
>>> [Tagging scope<-test_boost_log::test_boost_log()] Some tagged log line
>>> 4 [17.08.2010 21:22:43.083517] [] [00:00:00.000289] [Tagged line]
>>> [Tagging scope<-test_boost_log::test_boost_log()] Another tagged log line
>>> 5 [17.08.2010 21:22:43.083556] [] [00:00:00.000328]
>>> [test_boost_log::test_boost_log()] Now the tag is removed
>>> 6 [17.08.2010 21:22:43.083598] [error] [00:00:00.000370]
>>> [test_boost_log::test_boost_log()] An error severity message, will pass to
>>> the output
>>> 7 [17.08.2010 21:22:43.083633] [normal] [00:00:00.000405] [IMPORTANT
>>> MESSAGES] [test_boost_log::test_boost_log()] Some really urgent line
>>> 9 [17.08.2010 21:22:43.083673] [] [00:00:00.000444] [int
>>> foo(boost::log_mt_posix::sources::logger&)<-test_boost_log::test_boost_log()]
>>> foo is being called
>>> 8 [17.08.2010 21:22:43.083668] [] [00:00:00.000440]
>>> [test_boost_log::test_boost_log()] The result of foo is 10
>>> *terminate called after throwing an instance of
>>> 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::log_mt_posix::missing_value>
>>> >'*
>>> *  what():  Requested attribute value not found*
>>>
>>> So, the logger throws, sample.log is created, but empty. The library and
>>> the executable are compiled with
>>>
>>> -DBOOST_LOG_USE_CHAR
>>>
>>> and
>>>
>>> -DBOOST_LOG_DYN_LINK
>>>
>>>
>>> If someone could help...
>>>
>>> Best regards,
>>>
>>> Olivier
>>>
>>> PS: boost_1.42, log_1.0 (from sourceforge), g++4.3.4, 64bits ubuntu
>>>
>>
>>
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