[英]Boost::Log and log numbering
I've recently tried to add some logging via Boost log to a small application. 我最近尝试通过Boost日志添加一些日志记录到一个小应用程序。 However, using log rotation I can't for some reason get it to pick up the correct counter in the logs directory. 但是,使用日志轮换我不能出于某种原因让它在日志目录中选择正确的计数器。
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. 例如,如果我的Logs
目录包含文件Log_000.log
和Log_001.log
我希望日志记录以Log_002.log
开头,但它总是从0开始。
I'm probably missing something but if anyone can spot something I'd be grateful. 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。 Here's my startup code: 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();
}
Many thanks 非常感谢
Aha! 啊哈! It looks like if you use the add_file_log
helper it automatically calls scan_for_files
. 看起来如果使用add_file_log
帮助程序,它会自动调用scan_for_files
。
Calling it again causes the counter to be reset it seems, so I just removed my call to scan_for_files
再次调用它会导致计数器重置似乎,所以我只是删除了对scan_for_files
调用
Just popped this on as an answer in case it was driving anyone else mad! 只是把它作为一个答案,以防万一其他人疯了!
Here's a working sample 这是一个工作样本
You'll see that after it ran 10 times, Logs/
contains: 你会看到它运行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
#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, '*');
}
}
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