Log和日志编号

Log和日志编号

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Boost :: Log和日志编号

本文介绍了Boost :: Log和日志编号的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我最近尝试通过Boost日志向一些小型应用程序添加一些日志记录。但是，使用日志循环，由于某种原因，我无法使其在日志目录中选择正确的计数器。



例如，如果我的日志目录包含文件 Log_000.log 和 Log_001.log 以 Log_002.log 开头的日志记录，但始终总是从0开始。



我可能丢失了一些内容但如果有人能发现我将不胜感激。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

解决方案

啊！看起来，如果您使用 add_file_log 助手，它将自动调用 scan_for_files 。



再次调用它似乎会使计数器重置，所以我只是删除了对 scan_for_files

只是弹出一个答案，以防万一它使其他人发疯！



这是一个可行的示例





运行10次后，您会看到 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 998七月17 16:26 Log_089.log 
 -rw-r--r-- 1 2001 2000 998七月17 16:26 Log_090.log 
 -rw-r--r-- 1 2001 2000 998七月17 16:26 Log_091.log 
 -rw-r--r-- 1 2001 2000 998七月17 16:26 Log_092.log 
 -rw-r--r-- 1 2001 2000 998七月17 16:26 Log_093.log 
 -rw-r--r-- 1 2001 2000 998七月17 16:26 Log_094.log 
 -rw-r--r-- 1 2001 2000 998七月17 16:26 Log_095.log 
 -rw-r--r-- 1 2001 2000 998七月17:26 Log_096.log 
 -rw-r--r-- 1 2001 2000 998七月17:26 Log_097.log 
 -rw-r--r-- 1 2001 2000 998七月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 
）; 
 
 //自动d = x-> locked_backend（）-> scan_for_files（）; 
} 
 
 int main（）
 {
 initLogging（）; 
 for（int i = 0; i< 20; ++ i）{
 BOOST_LOG_TRIVIAL（trace）<< 我们一起去购物<< std :: string（400，‘*’）; 
} 
}


I've recently tried to add some logging via Boost log to a small application. However, using log rotation I can't for some reason get it to pick up the correct counter in the logs directory.

For example, if my Logs directory contains the files Log_000.log and Log_001.log I'd expect the logging to start with Log_002.log but it always starts again from 0.

I'm probably missing something but if anyone can spot something I'd be grateful. Here's my startup code:

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();
}

Many thanks

解决方案

Aha! It looks like if you use the add_file_log helper it automatically calls scan_for_files.

Calling it again causes the counter to be reset it seems, so I just removed my call to scan_for_files

Just popped this on as an answer in case it was driving anyone else mad!

Here's a working sample

Live On Coliru

You'll see that after it ran 10 times, Logs/ contains:

-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

Code Listing

#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, '*');
    }
}

这篇关于Boost :: Log和日志编号的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

07-23 23:50
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