|
|
| (21 intermediate revisions by 13 users not shown) |
| Line 1: |
Line 1: |
| When you start a konsole and type the commands to start an application you
| | {{Moved To Community | Guidelines_and_HOWTOs/Debugging }} |
| will see all sorts of statements are printed in the konsole while the
| |
| application is running. All applications print these messages, to look
| |
| at them you have to know where to look. The application will have to be
| |
| compiled with the debugging enabled. So using a precompiled package from a distribution
| |
| probably will not give you this information. If you compiled the application
| |
| yourself, make sure the configure option "<tt>--disable-debug</tt>" was not used.
| |
| | |
| In KDE all debugging text-output can be switched on or off based on so
| |
| called 'sections'. One application can be one section. One part of the kde
| |
| base libraries can be another section.
| |
| Enable/disabling these sections from being printed can be done using the
| |
| '''kdebugdialog''' application. For simple debugging selecting all
| |
| sections is probably wise.
| |
| | |
| When you are debugging it is best to simply start a konsole and start the
| |
| application from there. In a konsole you could simply type:
| |
| | |
| kicker
| |
| | |
| and in the konsole kicker could return a message like:
| |
| | |
| ERROR: kicker is already running!
| |
| | |
| When a lot of output is written to the konsole it might go out of view before
| |
| you could read it, therefor it is easy to create a text file which contains
| |
| all this information, to do so type the following:
| |
| | |
| application 2>&1 | tee debug.log
| |
| | |
| where 'application' can be replaced with the application you are debugging.
| |
| Afterwards you could open the file 'debug.log' to look at the messages again.
| |
| | |
| If you are NOT starting the application from a konsole the messages will be
| |
| logged somewhere else, or they could have been discarded by the program that
| |
| started your application.
| |
| | |
| If your application is started by clicking on an icon your best bet is to check
| |
| the following log files. Beware; they contain logs for a lot of applications,
| |
| not just the application you are debugging!
| |
| | |
| '''Case 1: Graphical login (i.e. kdm, gdm, xdm, etc.'''
| |
| | |
| The debug messages get redirected into the file {{path|~/.xsession-errors}} or
| |
| {{path|~/.X.err}} in your home directory (that is with a leading dot '.' also | |
| watch the Capital).
| |
| | |
| '''Case 2: You are using startx:'''
| |
| | |
| Use the following command to restart your session:
| |
| startx 2>&1 | tee startx.log</pre>
| |
| | |
| so that all the debug messages of applications started at KDE's startup (and
| |
| any application launched from the panel etc.) go to the file "startx.log"
| |
| | |
| == Links ==
| |
| | |
| The debug messages are usually printed in C++ with the kDebug statement. Example:
| |
| kDebug(1210) << "arbitrary message" << endl;
| |
| The number 1210 in this case represents kicker.
| |
| | |
| * [http://api.kde.org/cvs-api/kdelibs-apidocs/kdecore/html/group__kdebug.html#ga25 kDebug API documentation]
| |
| | |
| | |
