While creating or running an application, errors may occur. Such errors must be detected, analysed and corrected.
Finding errors in the scripts
Most errors can be detected in the INFO system in /Errors/Script
. Each error is listed with description, the row and column number in the script.
Writing user defined log entries into the INFO system
Some errors in the script can be more "tricky". For example the error can be of semantic origin instead of syntactic, i.e. the script is running, but not exactly the way it should be.
The cause of such error the Pm.Debug
method can be used (or the Pm.InfoLogAdd
method) and e.g. so-called "interval bisection
". It means that somewhere in the application this method is placed into the script (together with the tuning remark as a first parameter). Then it is possible to check the script completion in the running application and see the "tuning note" in the Debug item of the INFO system
. This information can be useful in order to decide whether the error occured in the script before
or after the remark
method and the Pm.InfoLogAdd
method works also in the Web client and the report can be viewed after pressing Shift-Ctrl-Alt-space
simultaneously in the Web panel
(or after pressing the F12
key on the "Console"
Long term application error observation
Information about errors that is written into the INFO system
is visible only if the application is running or stopped (in the runtime mode and in the development environment).
If the application is closed, the error information is lost.
Saving error information into the LOG file
The global errors can be written into the Application.log
This kind of error log can be set in the Application.ini
file in the [Log]
file can then be explored long after the application is running or stopped.
The error log is preset to record only the first occurrence of errors of each type.
Individual error logs
event of the PmaRoot
object also can be used for example:
- creating own error log file
- writing error event into alarms and events
There are situations that are not likely to accur during short term running of the application. For example:
- after OS Windows restart, the application is launched before all Windows services necessary for running it are active
- the connection with communication device is not re-estabilished after network breakdown, etc.
The application launch can be postponed for example by:
If the application or the OS Windows
"freezes" the PmRtManager as WatchDog
security component can be used for forcing the restart.