file loggers don't produce any output in the file

[p0fi]

I've tried to create a file logger by using this line:

auto MainDebug = spdlog::rotating_logger_mt("file_logger", "logs/mylogfile", 1048576 * 5, 3);

then i do write some log outputs with this line:

MainDebug->trace("some text");

the log file is created, but it always have a 0 bytes size and therefore nothing in it.

Using the latest version from the master branch.

[xaqq]

I suppose this has to do with the default log level.

On Thu, Apr 23, 2015 at 10:57 AM, p0fi notifications@github.com wrote:

I've tried to create a file logger by using this line:

auto MainDebug = spdlog::rotating_logger_mt("file_logger",
"logs/mylogfile", 1048576 * 5, 3);

then i do write some log outputs with this line:

MainDebug->trace("some text");

the log file is created, but it always have a 0 bytes size and therefore
nothing in it.

Using the latest version from the master branch.

—
Reply to this email directly or view it on GitHub
#82.

Kapp Arnaud - Xaqq

[p0fi]

This is interestingly producing output in the file:

auto rotating = make_shared<spdlog::sinks::rotating_file_sink_mt> ("logs/testlog", "log", 1024*1024, 5, false);
auto file_logger = make_shared<spdlog::logger>("my_logger", rotating);
file_logger->info("Hello spdlog {} {} {}", 1, 2, "three");

If try the exact same pattern with a logger with multiple sinks like this:

std::vector<spdlog::sink_ptr> sinks;
sinks.push_back(make_shared<spdlog::sinks::stdout_sink_mt>());
sinks.push_back(make_shared<spdlog::sinks::rotating_file_sink_mt> ("logs/testlog", "log", 1024*1024, 5, false));
auto file_logger = make_shared<spdlog::logger>("my_logger", begin(sinks), end(sinks));

file_logger->info("Hello spdlog {} {} {}", 1, 2, "three");

it only gives me the output in the console, nothing in the file,...the file is created but nothing is written in it!

[p0fi]

strange, this which was working for me described in the last comment stopped to work completely.

0 output into the file

what could be wrong?

[gabime]

Might be that the logger didnt flushed yet into the disk.
If you set the last param to true it will flush in every write(but will be much slower of course)

[p0fi]

Oh, well this really seems to fix the problem, thanks!
Maybe its worth mentioning it in the wiki?
And is there a way to manually flush it to the disk on demand?

[gabime]

I agree. The wiki should mention it.

No way to tell it to flush.
In older versions there was an integer instead of tne boolean to indicate the flush interval (e.g 4 to flush every 4 log calls), But i replaced with bool since it is simpler API..

Maybe i should return this feature if there is popular demand for it:)

[gabime]

Added a wiki page about it..