c++ - 为什么我的格式在 boost 日志中不起作用

Question

我在这个函数中使用了 boost::log:

#include <boost/log/core.hpp>
#include <boost/log/trivial.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/utility/setup/file.hpp>

void InitLog() {
  logging::core::get()->set_filter(logging::trivial::severity >= logging::trivial::debug);
  logging::add_file_log(
            keywords::file_name = AppHolder::Instance().config().log_folder + "/sign_%Y-%m-%d_%H-%M-%S.%N.log",
            keywords::rotation_size = 10 * 1024 * 1024,
            keywords::time_based_rotation = sinks::file::rotation_at_time_point(0, 0, 0),
            keywords::format = "%TimeStamp% (%LineID%) <%Severity%>: %Message%"
            );
}

然后，调用:

BOOST_LOG_TRIVIAL(info) << "thread id: " << this_thread::get_id() << " Initialization succeeded";

输出不符合预期:timestamp、line id 和severity 为空。

() <>: thread id: 7f58e30e8740 Initialization succeeded

Answer 1

您必须向日志核心注册这些属性。像这样:

boost::log::add_common_attributes();

或手动:

boost::log::core::get()->add_global_attribute("TimeStamp", boost::log::attributes::local_clock());
// etc...