我使用自定义boost::log格式化程序对输出日志消息进行颜色编码,但我未能找到添加 TimeStamp 和的正确方法ThreadID 属性到日志。当我使用文件记录时,我只需将keywords::format = "[%TimeStamp%] [%ThreadID%] [%Severity%]: %Message%"
写为logging::add_file_log
参数。我希望在以下自定义格式化程序中具有类似的效果:
void coloring_formatter(const logging::record_view& record,
logging::formatting_ostream& stream)
{
auto severity = record[logging::trivial::severity];
assert(severity);
stream << "\e[1m";
switch (severity.get())
{
case logging::trivial::severity_level::trace:
stream << "\e[97m";
break;
case logging::trivial::severity_level::debug:
stream << "\e[34m";
break;
case logging::trivial::severity_level::info:
stream << "\e[32m";
break;
case logging::trivial::severity_level::warning:
stream << "\e[93m";
break;
case logging::trivial::severity_level::error:
stream << "\e[91m";
break;
case logging::trivial::severity_level::fatal:
stream << "\e[41m";
break;
}
stream // << output TimeStamp
// << output ThreadID
<< "[" << severity << "] "
<< record[logging::expressions::smessage]
<< "\e[0m";
}
答案 0 :(得分:4)
鉴于您已将这些属性添加到日志记录中,有多种方法可以提取它们。最简单的方法是使用keywords。首先声明属性的关键字:
BOOST_LOG_ATTRIBUTE_KEYWORD(a_timestamp, "TimeStamp", attrs::local_clock::value_type)
BOOST_LOG_ATTRIBUTE_KEYWORD(a_thread_id, "ThreadID", attrs::current_thread_id::value_type)
请注意,第三个参数是相应属性的值类型。在此示例中,我假设您使用的属性为local_clock
和current_thread_id
。
现在,您可以使用这些关键字从日志记录中提取值。
stream << record[a_timestamp] << " "
<< record[a_thread_id]
<< " [" << severity << "] "
<< record[logging::expressions::smessage]
<< "\e[0m";