[#BloombergLP-ball-AsyncFileObserver-setFileLogFormat]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::xref:BloombergLP/ball/AsyncFileObserver.adoc[AsyncFileObserver]::setFileLogFormat
:relfileprefix: ../../../
:mrdocs:

Set the format specifications for log records written to the log file `logFileFormat`. See {Log Record Formatting} for details on the syntax of format specifications. Return zero if the format is valid and the corresponding formatter has been set. Otherwise, if the format is invalid, return a non‐zero value and do not change the formatter. Note that default format is in effect following construction until a format‐setting method is called ("n%d %p:%t %s %f:%l %c %m %un" for both file and `stdout` logging).

== Synopsis

Declared in `<ball_asyncfileobserver.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
setFileLogFormat(char const* logFileFormat);
----


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