我正在使用Boost日志库(版本1.55),我正在尝试自定义输出格式。很遗憾,我似乎无法制作自定义格式来显示TimeStamp
属性。
示例程序,主要取自Boost日志文档中的示例:
#include <boost/log/trivial.hpp>
#include <boost/log/sinks.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/support/date_time.hpp>
#include <boost/utility/empty_deleter.hpp>
namespace logging = boost::log;
namespace sinks = logging::sinks;
namespace expr = logging::expressions;
namespace attrs = logging::attributes;
int main()
{
using text_sink = sinks::synchronous_sink<sinks::text_ostream_backend>;
auto sink = boost::make_shared<text_sink>();
// Add standard output as destination for the sink
boost::shared_ptr<std::ostream> stream(&std::cout, boost::empty_deleter());
sink->locked_backend()->add_stream(stream);
// Set output format
sink->set_formatter(
expr::stream
<< '['
<< expr::format_date_time<boost::posix_time::ptime>("TimeStamp", "%Y-%m-%d %H:%M:%S")
<< "] - "
<< expr::smessage
);
logging::core::get()->add_sink(sink);
// Test logging
BOOST_LOG_TRIVIAL(info) << "Hello world";
}
此程序的输出
[] - Hello world
格式化工作正常,但TimeStamp
部分应该在方括号内。
我是否使用格式化功能错误,或者我错过了其他内容?
答案 0 :(得分:16)
您应该包含文件<boost/log/utility/setup/common_attributes.hpp>
并调用函数
logging::add_common_attributes()