[Qgis-developer] prints to std::cout in qgis

[Gavin Macaulay]

Hi,

I've used log4cxx (http://logging.apache.org/log4cxx/) in the past. It is
quite comprehensive, but is a little awkward to use. It has good
facilities for redirecting log messages to various locations.

Gavin

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> Hi
>
> One other idea I could throw into the pot is to have a logger class. We
> could then set it up to write to console, to file or even in the future
> to some part of the gui. The latter could help when we have non
> technical users and windows users who experience problems - we can just
> ask us to send output from the logger window or whathaveyou. Log
> requests could be static methods or we could use qt signals and slots
> and connect the logger to objects being logged when they are
> instantiated. Example invocation mechanisms:
>
> emit logMessage("foo",QgsLogger::Critical);
> emit logMessage("foo",QgsLogger::Informational);
>
> or
>
> QgsLogger::logMessage("foo",QgsLogger::Critical);
> QgsLogger::logMessage("foo",QgsLogger::Informational);
>
> Just another thought anyway...
>
> Regards
>
> Tim
>
> Martin Dobias wrote:
>> On 3/22/06, Mateusz ?oskot <mateusz at loskot.net> wrote:
>>> Martin Dobias wrote:
>>>> Moreover it would be good to have some constants or so, which will
>>>> indicate what kind of debug message is it - e.g. notice, warning,
>>>> error, fatal. Then, a call like
>>>>
>>>> DEBUG_PRINT(NOTICE, "This is just a notice")
>>> I'd name all QGIS related macros starting from QGIS_,
>>> e.g. QGIS_DEBUG_PRINT or QGIS_DEBUG_MSG
>>>
>>> There were problems with GEOS on Windows, because it used macro named
>>> as
>>> DEBUG, which is defined and used by VC++ compiler.
>>> So, it had to be changed to GEOS_DEBUG.
>>>
>>>> would produce e.g.:
>>>> NOTICE: This is just a notice.
>>> Do you mean this additional argument should control
>>> what is placed in front of the message?
>>> Examples:
>>>
>>> ERROR: This is an error
>>> or for better readability:
>>>
>>> #
>>> # ERROR: This is an error
>>> #
>>>
>>> WARNING: This is a warning
>>> NOTICE: This is a note
>>>
>>> ?
>>
>> I meant it could help users (and developers) to find out what does the
>> message actually mean when they don't know exactly what does it mean
>> and whether they should report it. Btw. good idea that errors could be
>> printed with such emphasis.
>>
>> Martin
>>
>>> Cheers
>>> --
>>> Mateusz ?oskot
>>> http://mateusz.loskot.net
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>>>
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>
> - --
> Tim Sutton (tim at linfiniti.com)
>
> Visit http://qgis.org for a great open source GIS application
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