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

Subject: Re: [Boost-users] [Log] How to use?
From: Oskar Nordquist (oskar.nordquist_at_[hidden])
Date: 2010-08-20 12:09:40

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.

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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