问题描述
我在下面的链接中使用示例。
I am using the example at the following link.
我的代码如下。
#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <boost/log/core.hpp>
#include <boost/log/trivial.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/utility/setup/file.hpp>
#include <boost/log/utility/setup/common_attributes.hpp>
#include <boost/log/utility/setup/from_stream.hpp>
#include <boost/log/utility/setup/settings.hpp>
#include <boost/log/utility/setup/from_settings.hpp>
#include <boost/regex.hpp>
namespace logging = boost::log;
namespace keywords = boost::log::keywords;
#define BOOST_LOG_DYN_LINK 1
int main(int, char*[])
{
//init_logging();
std::ifstream file("settings.ini");
logging::init_from_stream(file);
BOOST_LOG_TRIVIAL(trace) << "This is a trace severity message";
BOOST_LOG_TRIVIAL(debug) << "This is a debug severity message";
BOOST_LOG_TRIVIAL(info) << "This is an informational severity message";
BOOST_LOG_TRIVIAL(warning) << "This is a warning severity message";
BOOST_LOG_TRIVIAL(error) << "This is an error severity message";
BOOST_LOG_TRIVIAL(fatal) << "and this is a fatal severity message";
return 0;
}
我的settings.ini文件如下所示。
My settings.ini file look as follows.
# Logging core settings section. May be omitted if no parameters specified within it.
[Core]
DisableLogging=false
Filter="%Severity% > 3"
# Sink settings sections
[Sinks.MySink1]
# Sink destination type
Destination=TextFile
FileName="MyApp.log"
RotationSize=1024
# Formatter string. Optional, by default only log record message text is written.
Format="<%TimeStamp%> - %Message%"
# The flag shows whether the sink should be asynchronous
Asynchronous=false
但是没有创建文件。我在做什么错了?
However no file is getting created. What am I doing wrong?
推荐答案
一切正常,直到您添加过滤器为止:
Everything works right up until you add the filter:
Filter="%Severity% > 3"
使用Google搜索(例如,通过),我发现:
Googling a bit (via Boost.Log Configuration Files e.g.) I found:
您必须在
库中注册任何用户定义的属性值类型,才能将其与过滤和格式化解析器。
这包括您的严重性级别枚举。
You have to register any user-defined attribute value types with the library in order to be able to use it with filter and format parsers. This includes your severity level enum.
添加为:
logging::register_simple_filter_factory<logging::trivial::severity_level>("Severity");
现在,修复过滤器表达式以使用文本表示形式:
Now, fix the filter expression to use the text representation:
Filter="%Severity% > debug"
同样,您:
In similar vein, you need to add the TimeStamp
attribute to core:
logging::core::get()->add_global_attribute("TimeStamp", logging::attributes::local_clock());
现在一切正常:
#include <fstream>
#include <iostream>
#include <boost/log/attributes.hpp>
#include <boost/log/core.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 <boost/log/utility/setup/from_settings.hpp>
#include <boost/log/utility/setup/from_stream.hpp>
#include <boost/log/utility/setup/settings.hpp>
#include <boost/regex.hpp>
namespace logging = boost::log;
namespace keywords = boost::log::keywords;
#define BOOST_LOG_DYN_LINK 1
int main(int, char *[]) {
std::ifstream file("settings.ini");
logging::core::get()->add_global_attribute("TimeStamp", logging::attributes::local_clock());
logging::register_simple_filter_factory<logging::trivial::severity_level>("Severity");
logging::init_from_stream(file);
BOOST_LOG_TRIVIAL(trace) << "This is a trace severity message";
BOOST_LOG_TRIVIAL(debug) << "This is a debug severity message";
BOOST_LOG_TRIVIAL(info) << "This is an informational severity message";
BOOST_LOG_TRIVIAL(warning) << "This is a warning severity message";
BOOST_LOG_TRIVIAL(error) << "This is an error severity message";
BOOST_LOG_TRIVIAL(fatal) << "and this is a fatal severity message";
}
写入MyApp.log的
Which writes to MyApp.log:
<2018-09-01 00:36:11.972436> - This is an informational severity message
<2018-09-01 00:36:11.972712> - This is a warning severity message
<2018-09-01 00:36:11.972735> - This is an error severity message
<2018-09-01 00:36:11.972747> - and this is a fatal severity message
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