我正在尝试为我的应用程序做一个日志。我想添加一个属性,这样我就可以知道日志属于哪个类。我已经开始测试它是否有效:
#include <boost/log/expressions.hpp>
#include <boost/log/attributes.hpp>
#include <boost/log/common.hpp>
#include <boost/log/sources/severity_logger.hpp>
#include <boost/log/utility/setup/common_attributes.hpp>
#include <boost/log/sinks/sync_frontend.hpp>
#include <boost/log/sinks/syslog_backend.hpp>
enum severity_levels
{
debug,
info,
warning,
error
};
typedef boost::log::sinks::synchronous_sink< boost::log::sinks::syslog_backend > SinkSysLogBackEnd;
typedef boost::log::sources::severity_logger< severity_levels > BoostLogger;
std::ostream& operator<< (std::ostream& strm, severity_levels level)
{
static const char* strings[] =
{
"debug",
"info",
"warning",
"error"
};
if (static_cast< std::size_t >(level) < sizeof(strings) / sizeof(*strings))
strm << strings[level];
else
strm << static_cast< int >(level);
return strm;
}
BOOST_LOG_ATTRIBUTE_KEYWORD(severity, "Severity", severity_levels)
BOOST_LOG_ATTRIBUTE_KEYWORD(executable, "Executable", std::string)
BOOST_LOG_ATTRIBUTE_KEYWORD(className, "Class name", std::string)
void init_syslog()
{
// Create a backend
boost::shared_ptr< SinkSysLogBackEnd > sink(new SinkSysLogBackEnd());
// We'll have to map our custom levels to the syslog levels
boost::log::sinks::syslog::custom_severity_mapping< severity_levels > mapping("Severity");
mapping[info] = boost::log::sinks::syslog::info;
mapping[warning] = boost::log::sinks::syslog::warning;
mapping[error] = boost::log::sinks::syslog::error;
sink->set_formatter(
boost::log::expressions::stream
// line id will be written in hex, 8-digits, zero-filled
<< executable << " <" << severity
<< "> : " << boost::log::expressions::smessage);
sink->locked_backend()->set_severity_mapper(mapping);
// Set the remote address to sent syslog messages to
sink->locked_backend()->set_target_address("localhost");
// Wrap it into the frontend and register in the core.
// The backend requires synchronization in the frontend.
boost::log::core::get()->add_sink(sink);
}
class Cls1
{
BoostLogger m_lg;
public:
Cls1()
{
// set the class name to Cls1
}
void foo()
{
// print log that has "Class Name" attribute set to "Cls1"
}
};
class Cls2
{
BoostLogger m_lg;
public:
Cls2()
{
// set the class name to Cls2
}
void foo()
{
// print log that has "Class Name" attribute set to "Cls2"
}
};
int main(int argc, char** argv)
{
init_syslog();
Cls1 o1;
o1.foo();
Cls2 o2;
o2.foo();
return 0;
}
现在我卡住了...
- 怎么做比较好?
- 如何将属性设置为想要的值?
- 我应该将 BoostLogger 成员设为静态吗?
感谢您的任何建议。我看过 boost 日志属性教程( link1 、 link2 、 link3 ),但我还没有找到有用的东西...
最佳答案
下面是我编写的示例:
记录器.hpp :
#ifndef LOGGER_HPP
#define LOGGER_HPP
#include <ostream>
#include <fstream>
#include <boost/shared_ptr.hpp>
#include <boost/log/common.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/attributes.hpp>
#include <boost/log/sources/logger.hpp>
#include <boost/log/sinks/async_frontend.hpp>
#include <boost/log/sinks/text_ostream_backend.hpp>
#include <boost/utility/empty_deleter.hpp>
class Logger
{
public:
typedef boost::log::sinks::asynchronous_sink<boost::log::sinks::text_ostream_backend> text_sink;
Logger();
~Logger();
void Initialize();
void Finalize();
void addStream(boost::shared_ptr<std::ostream>& stream);
template< typename T >
Logger& operator<<(const T& value)
{
BOOST_LOG(my_logger::get()) << value;
return *this;
}
typedef Logger& (*LoggerManipulator)(Logger&);
Logger& operator<<(LoggerManipulator manip)
{
return manip(*this);
}
static Logger& endl(Logger& stream)
{
std::cout << std::endl;
return stream;
}
typedef std::basic_ostream<char, std::char_traits<char>> CoutType;
typedef CoutType& (*StandardEndLine)(CoutType&);
Logger& operator<<(StandardEndLine manip)
{
manip(std::cout);
return *this;
}
private:
boost::log::sources::logger_mt m_lg;
boost::shared_ptr<text_sink> m_sink;
};
#endif LOGGER_HPP
记录器.cpp:
#include <boost/date_time/posix_time/posix_time.hpp>
#include "Logger.hpp"
Logger::Logger()
:
m_sink(new text_sink),
m_lg()
{
}
Logger::~Logger()
{
}
void Logger::Initialize()
{
m_sink->locked_backend()->auto_flush(true);
m_sink->set_formatter
(
boost::log::expressions::format("[%1%] - %2%")
% boost::log::expressions::attr< boost::posix_time::ptime >("TimeStamp")
% boost::log::expressions::smessage
);
boost::log::core::get()->add_sink(m_sink);
boost::log::core::get()->add_global_attribute("TimeStamp",boost::log::attributes::local_clock());
}
void Logger::Finalize()
{
}
void Logger::addStream(boost::shared_ptr<std::ostream>& stream)
{
m_sink->locked_backend()->add_stream(stream);
}
主要.cpp:
int main
{
boost::shared_ptr<std::ostream> stream_out(&std::clog, boost::empty_deleter());
boost::shared_ptr<std::ostream> stream_file(new std::ofstream(ProgramName + ".log", std::ostream::app));
Logger logger;
logger.addStream(stream_out);
logger.addStream(stream_file);
logger.Initialize();
logger << "Sample";
return 0;
}
关于c++ - boost 日志记录类属性,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25041577/