QLogger - A tiny Qt log framework.
The purpose of this log framework is to be easy to configure and use on
a Qt project.
QLogger rely only on Qt framework, so it does not have any other
external dependencies.
The project is available as QtCreator console project. One could just create a
Lib project or add the source directly to a project. In the source folder there
is a main file with some tests that can be used also as example.
If you want to fork, share, use or just give suggestions feel free. I'll be glad to hear
comments and critics on the code too, don't hesitate to contact me.
The code is licensed under MIT License.
-------------------------------------------------------------------------------
// simple use:
#include "qlogger.h"
using namespace qlogger;
int main(int argc, char *argv[])
{
QLOG_FATAL("this is quick log using the default root logger");
//or for the ones who does not like macros
QLogger::fatal("this is quick logged using the default root logger");
...
-------------------------------------------------------------------------------
This simple example logs a message on the console based on a default logger called "root".
This log is always created and can be used without passing any arguments, it is default
to ERROR level. Log levels are defined as: q0FATAL, q1ERROR, q2WARN, q3INFO, q4DEBUG, q5TRACE
-------------------------------------------------------------------------------
// overriding log configurations:
#include "qlogger.h"
using namespace qlogger;
int main(int argc, char *argv[])
{
QLogger::addLogger("root", Configuration::q2WARN, Configuration::TEXTFILE);
QLOG_WARN("this is quick logged using the default root logger");
...
-------------------------------------------------------------------------------
On this example we add another level to "root" logger, but this time the logging will
be done to a text file. A logger can have multiple outputs. But note that the log message
will not be displayed on the cosole because its on a level greater than ERROR, if we change
code to:
QLOG_ERROR("this is quick logged using the default root logger");
then we will have a log on both console and text file.
A logger can be created with a whole custom configuration:
-------------------------------------------------------------------------------
// overriding log configurations:
#include "qlogger.h"
using namespace qlogger;
int main(int argc, char *argv[])
{
Configuration* cfg =
new Configuration("config", Configuration::q3INFO, Configuration::TEXTFILE,
"dd-MM-yyyy hh:mm:ss", "%t [%l] <%o> : %m",
"myfile_%3_%2_%1.log", "ddMMyyyy_hhmmss", "c:\\", 10000);
QLogger::addLogger(cfg);
...
QLOG_WARN("this will be saved on a file at c:", "config");
...
-------------------------------------------------------------------------------
By default text files are saved on application path, but this can be configured as
the example above shows, also there is options to change the text log format the
file name and the maximum size of a log file (when this limit is reached the logger
just create another file).
Console and TextFile logs uses a mask to generate the log string to be displayed.
The default mask is: %t [%o] <%l> (%f) {line:%n} - %m where the sysmbols are:
%t - the log timestamp
%o - the log owner ("root", or on the previous example "config")
%l - the level of the log.
%f - the name of the function where the log was called
(note that this rely on the macro __FUNCTION__ and only works with macro loggers).
%n - the line number where the log was called (use the macro __LINE__, same as above).
%m - the log message itself.
Date Time masks are available for both file name and the log, both masks use Qt DateTime
formatting rules.
-------------------------------------------------------------------------------
// log configurations loaded from a qlogger.cfg file:
#include "qlogger.h"
using namespace qlogger;
int main(int argc, char *argv[])
{
QLOG_WARN("loaded a log from config and save to a file !!!!", "file");
...
-------------------------------------------------------------------------------
This example shows a logger that was added from a configuration file. In order
to use a configuration file, one can simply add a qlogger.ini (ini file format) file
onto application path. QLogger will parse the file when the first instance of
logger is called. Note that this also allows adding logs programatically so
they both can be used together.
Example of a configuration file for QLogger:
-------------------------------------------------------------------------------
# line comment
# first configuration will log to warn level to a file on c:\ with 10Mb of size
[file]
level=warn
outputType=text
# in this option is possible to pass file sizes in plain int (number of bytes) or with the following
# options: x Mb, xM, xm, xMB, x mb, xKB, xk, xK, xKb, xkb, xg, xG, xgb, xGb, xGB as x being a number.
# examples: 100 kb, 100k, 10M, 1MB, 5g, 10 Mb...
# 100 kb file
maxFileSize=100k
path=c:/temp/
maxFileSize=10000
path=c:/temp/
# second config will log to console with trace level and customized log text mask
[cons]
level=trace
outputType=console
logMask=time:%t owner:%o level:%l function:%f line:%n message:%m
# third a xml output
[xml]
level=trace
outputType=xml
fileName=XML_log_%1_%2_%3.xml
path=c:/temp/
-------------------------------------------------------------------------------
This small readme covered almost everything QLogger is capable to do, there are some
other configurations and details, but they are pretty straight forward to understand
by reading the code.
I hope this tiny project could be useful to you.
Regards,
Sandro.