提升日志文件未写入 [英] boost log file not written to

问题描述

我一直在努力处理Boost日志-我得到了他们简单的示例，将其写入日志文件（ http://boost-log.sourceforge.net/libs/log/example/doc/tutorial_file.cpp ）。但是，当我尝试将该代码复制到 Logger类中时，无法将其写入日志文件。我可以看到文件 default.log 已创建，但其中没有任何内容。

I've been struggling with boost log for a while now - I got their simple example writing to a log file (http://boost-log.sourceforge.net/libs/log/example/doc/tutorial_file.cpp). However, when I try to copy that code into a 'Logger' class, I can't get it to write to the log file. I can see the file default.log get created, but there is nothing in it.

我在debian 7 64位。一切都可以正常编译-编译行是：

I'm on debian 7 64bit. Everything compiles fine - compile line is:

g++ -o build/Logger.o -c -std=c++11 -Wall -g -O0 -DBOOST_LOG_DYN_LINK -DDEBUG src/Logger.cpp
g++ -o build/logtest build/Logger.o -lboost_log -lboost_log_setup -lboost_date_time -lboost_thread -lboost_wave -lboost_regex -lboost_program_options

这是我的代码：

Logger.cpp

/*
 * Logger.cpp
 *
 *  Created on: 2011-01-17
 *      Author: jarrett
 */

#include "Logger.h"

namespace logging = boost::log;
namespace sinks = boost::log::sinks;
namespace src = boost::log::sources;
namespace expr = boost::log::expressions;
namespace attrs = boost::log::attributes;
namespace keywords = boost::log::keywords;

namespace dhlogging {

Logger::Logger(std::string fileName)
{
    initialize(fileName);
}

Logger::Logger(Logger const&)
{
}

Logger::~Logger()
{

}

Logger* Logger::logger_ = nullptr;
Logger* Logger::getInstance(std::string logFile)
{
    if ( Logger::logger_ == nullptr ) {
        logging::add_file_log( logFile );

        logging::core::get()->set_filter
        (
            logging::trivial::severity >= logging::trivial::info
        );

        logging::add_common_attributes();
        Logger::logger_ = new Logger(logFile);
    }

    return Logger::logger_;
}

void Logger::initialize(std::string fileName)
{   
    BOOST_LOG(log_) << "Hello, World!";
    BOOST_LOG_SEV(log_, info) << "Hello, World2!";
}

void Logger::logInfo(std::string message)
{
    BOOST_LOG_SEV(log_, info) << message;
}

void Logger::logDebug(std::string message)
{
    BOOST_LOG_SEV(log_, debug) << message;
}

void Logger::logWarn(std::string message)
{
    BOOST_LOG_SEV(log_, warning) << message;
}

void Logger::logError(std::string message)
{
    BOOST_LOG_SEV(log_, error) << message;
}

void Logger::logFatal(std::string message)
{
    BOOST_LOG_SEV(log_, fatal) << message;
}

}

int main(int, char*[])
{
    logging::add_common_attributes();

    using namespace logging::trivial;

    dhlogging::Logger::getInstance()->logInfo("himom");

    return 0;
}

Logger.h

/*
 * Logger.h
 *
 *  Created on: 2011-01-17
 *      Author: jarrett
 */

#ifndef LOGGER_H_
#define LOGGER_H_

#include <map>
#include <boost/log/core.hpp>
#include <boost/log/trivial.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/sinks/text_file_backend.hpp>
#include <boost/log/utility/setup/file.hpp>
#include <boost/log/utility/setup/common_attributes.hpp>
#include <boost/log/sources/severity_logger.hpp>
#include <boost/log/sources/record_ostream.hpp>

namespace logging = boost::log;
namespace sinks = boost::log::sinks;
namespace src = boost::log::sources;
namespace expr = boost::log::expressions;
namespace attrs = boost::log::attributes;
namespace keywords = boost::log::keywords;

using namespace logging::trivial;

namespace dhlogging {
class Logger {

public:
    static Logger* getInstance(std::string logFile = "default.log");

    void logInfo(std::string message);
    void logDebug(std::string message);
    void logWarn(std::string message);
    void logError(std::string message);
    void logFatal(std::string message);


private:
    Logger(std::string fileName);
    Logger(Logger const&);
    Logger& operator=(Logger const&);
    virtual ~Logger();

    void initialize(std::string fileName);

    src::severity_logger< severity_level > log_;

    static Logger* logger_; // singleton instance
};
}
#endif /* LOGGER_H_ */

推荐答案

创建文件日志时需要此属性

you need to this attribute when creating the file log

keywords::auto_flush = true 

以这种方式立即写入日志条目。
默认情况下，超出范围的文件记录器似乎会写入文件，或者在其他神秘之处，文档中没有提及任何内容

that way log entrys get written immediately. by default, the file logger seems to write to file when it goes out of scope, or at some other mysterious point, the documentation doesn´t mention anything about

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