如何使用boost.log以dec格式打印ProcessID和ThreadID [英] how to print ProcessID and ThreadID in dec-format with boost.log

问题描述

我在程序中使用boost.log，默认格式化程序以十六进制格式输出ProcessID和ThreadID，任何人都知道如何以dec格式打印它们，谢谢。

I use boost.log in my program, and the default formatter outputs the ProcessID and ThreadID in hex-format, anyone knows how to print them in dec-format, thanks.

这是我的代码的github： https://github.com/owenliang/boost_asio

this is the github of my code : https://github.com/owenliang/boost_asio, thanks.

  boost::log::formatter scope_formatter = boost::log::expressions::stream << "[" <<
      boost::log::expressions::format_date_time<boost::posix_time::ptime>("TimeStamp", "%Y-%m-%d %H:%M:%S") <<
      "] [" << boost::log::expressions::attr<boost::log::attributes::current_process_id::value_type>("ProcessID") << 
      "-" << boost::log::expressions::attr<boost::log::attributes::current_thread_id::value_type>("ThreadID") << "] [" <<
      boost::log::expressions::attr<boost::log::trivial::severity_level>("Severity") <<
      "] " << boost::log::expressions::format_named_scope("Scope", boost::log::keywords::format = "%c[%F:%l] ", 
        boost::log::keywords::depth = 1) << boost::log::expressions::smessage;

推荐答案

Boost Log提供线程和进程ID作为类类型。如果要获取它们的整数值，则需要首先获取其本机ID，如下所示：

Boost Log provides the thread and process IDs as class type. If you want to get their integral value you need to get their native ID first as follows:

#include <boost/phoenix.hpp>

/* Define place holder attributes */
BOOST_LOG_ATTRIBUTE_KEYWORD(process_id, "ProcessID", attrs::current_process_id::value_type )
BOOST_LOG_ATTRIBUTE_KEYWORD(thread_id, "ThreadID", attrs::current_thread_id::value_type )

// Get Process native ID
attrs::current_process_id::value_type::native_type get_native_process_id(
        logging::value_ref<attrs::current_process_id::value_type,
        tag::process_id> const& pid)
{
    if (pid)
        return pid->native_id();
    return 0;
}

// Get Thread native ID
attrs::current_thread_id::value_type::native_type get_native_thread_id(
        logging::value_ref<attrs::current_thread_id::value_type,
        tag::thread_id> const& tid)
{
    if (tid)
        return tid->native_id();
    return 0;
}

然后在set_formatter（）中，例如：

Then in your set_formatter(), e.g.:

   sink->set_formatter
        (
         expr::stream
         << boost::phoenix::bind(&get_native_process_id, process_id.or_none()) << ":"
         << boost::phoenix::bind(&get_native_thread_id, thread_id.or_none()) << ":"
         << "[" << expr::format_date_time< boost::posix_time::ptime >("TimeStamp", "%Y%m%d %H:%M:%S")
         << "]:*" << severity << "*:"
         << expr::smessage
        );

输出：

39157:140229314553664:[20170710 15:32:15]:*INF*:Log message

这篇关于如何使用boost.log以dec格式打印ProcessID和ThreadID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IT屋！