How to stop wt c++ writing to stdout (console)

Question

Wt is a C++ framework and it, like many others, write the results from events to stdout aka console. While other side of the application what is in use, also writes to it, all this info gets cluttered together and is hard to read. The aim is to write everything from Wt to a logging file.

From source code I found something:

 Wt::WLogger logger; 
 logger.setFile("logging_file.txt");
 logger.configure("* -debug debug:wthttp");

However, I didn't still manage to BLOCK it from writing to std out. What is needed would look like.

 Wt::WLogger logger;
 logger.setFile("logging_file.txt");
 logger.configure("-no_std_out"); //this is a made up argument

To be more specific about what exactly? Wt writes events to std out aka console e.g: 127.0.0.1 - - blabla POST /?etcetc Can it be redirected to a file instead of flooding stdout. — Levi, Sep 28 '17 at 07:34

score 2 · Accepted Answer · answered Sep 28 '17 at 16:11

Everything that's output by Wt's logger is written to the log file configured in your configuration. The shortest configuration file that redirects logging to a file would be the following:

<server>
    <application-settings location="*">
        <log-file>/path/to/logfile</log-file>
    </application-settings>
</server>

There's one exception to this: Wt::Dbo often logs to stderr. We (the Wt developers) may change this in the future to make it a bit more configurable too.

Your code sample will only configure one specific instance of WLogger, and wouldn't work for the logging of Wt itself, which uses its own logger. You can access that instance with WServer::logger().

There's also the access log. You can configure where that goes with the --accesslog option.

Thank you, that log file works well. However, is it possible to also redirect GET/POST message to log file? e.g: " 127.0.0.1 - - [2017-Sep-29 11:01:37.664611] "GET /?_=/test HTTP/1.1" 200 2901 " — Levi, Sep 29 '17 at 08:10
That's the `--accesslog` option I was talking about. Just provide that option to the Wt executable next to all of the other options (`--docroot`, etc.). — RockinRoel, Oct 01 '17 at 13:23

anotherone · Answer 2 · 2017-09-28T11:09:26.073

If I have properly understood what you are asking: you need to create an object of the type ofstream and then use it as follows:

#include <iostream>
#include <fstream> // needed for file operation
int main () {
std::ofstream file; 
file.open ("hello.txt");
// now do your calculation, other stuff...
// write to the file
file << "Text here\n";
file.close();
return 0;
}

This is, of course, the most basic stuff. More details can be found here, for example.

score 0 · Answer 3 · answered Sep 28 '17 at 07:38

0

How to redirect stdout from wt to some file?

Maybe pipes can help you

answered Sep 28 '17 at 07:38

Quentin Laillé

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How to stop wt c++ writing to stdout (console)

3 Answers3