Boost ::日志和日志编号

时间:2015-07-17 12:45:33

标签: c++ boost boost-log

我最近尝试通过Boost日志将一些日志记录添加到一个小应用程序中。但是,使用日志轮换我无法出于某种原因让它在日志目录中选择正确的计数器。

例如,如果我的Logs目录包含文件Log_000.logLog_001.log,我希望记录以Log_002.log开头,但它始终从0开始。

我可能错过了一些东西,但如果有人能发现某些东西我会感激不尽。这是我的启动代码:

void initLogging()
{
    boost::log::add_common_attributes();
    auto core = boost::log::core::get();

    core->add_global_attribute("UTCTimeStamp",boost::log::attributes::utc_clock());

    auto x = boost::log::add_file_log(
        boost::log::keywords::file_name             = "Log_%3N.log",
        boost::log::keywords::rotation_size         = 2 * 1024, // 2k
        boost::log::keywords::target                = "Logs",
        boost::log::keywords::min_free_space        = 30 * 1024 * 1024,
        boost::log::keywords::max_size              = 20 * 1024, // 20k
        boost::log::keywords::time_based_rotation   = boost::log::sinks::file::rotation_at_time_point(boost::gregorian::greg_day(31)),
        boost::log::keywords::scan_method           = boost::log::sinks::file::scan_matching,
        boost::log::keywords::format                = "%UTCTimeStamp% (%TimeStamp%) [%ThreadID%]: %Message%",
        boost::log::keywords::auto_flush            = true
        );

    auto d = x->locked_backend()->scan_for_files();
}

非常感谢

1 个答案:

答案 0 :(得分:4)

啊哈!看起来如果您使用add_file_log帮助程序,它会自动调用scan_for_files

再次调用会导致计数器重置,所以我只是将我的电话移至scan_for_files

只是把它打开作为一个答案,万一它会让其他人疯狂!

这是一个工作样本

<强> Live On Coliru

您会看到它运行10次后,Logs/包含:

-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_080.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_081.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_082.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_083.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_084.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_085.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_086.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_087.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_088.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_089.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_090.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_091.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_092.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_093.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_094.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_095.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_096.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_097.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_098.log
-rw-r--r-- 1 2001 2000 998 Jul 17 16:26 Log_099.log

代码清单

#define BOOST_LOG_DYN_LINK 1
#include <boost/log/core.hpp>
#include <boost/log/common.hpp>
#include <boost/log/attributes.hpp>
#include <boost/log/sinks.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/trivial.hpp>
#include <boost/log/utility/setup/common_attributes.hpp>
#include <boost/log/utility/setup/file.hpp>
#include <string>

void initLogging()
{
    boost::log::add_common_attributes();
    auto core = boost::log::core::get();

    core->add_global_attribute("UTCTimeStamp",boost::log::attributes::utc_clock());

    auto x = boost::log::add_file_log(
            boost::log::keywords::file_name             = "Log_%3N.log",
            boost::log::keywords::rotation_size         = 1 * 1024, // 1k
            boost::log::keywords::target                = "Logs",
            boost::log::keywords::min_free_space        = 30 * 1024 * 1024,
            boost::log::keywords::max_size              = 20 * 1024,
            boost::log::keywords::time_based_rotation   = boost::log::sinks::file::rotation_at_time_point(boost::gregorian::greg_day(31)),
            boost::log::keywords::scan_method           = boost::log::sinks::file::scan_matching,
            boost::log::keywords::format                = "%UTCTimeStamp% (%TimeStamp%) [%ThreadID%]: %Message%",
            boost::log::keywords::auto_flush            = true
        );

    //auto d = x->locked_backend()->scan_for_files();
}

int main()
{
    initLogging();
    for (int i = 0; i < 20; ++i) {
        BOOST_LOG_TRIVIAL(trace) << "Let's go shopping " << std::string(400, '*');
    }
}